[337] | 1 | /***************************************************************************
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| 2 | * _ _ ____ _
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| 3 | * Project ___| | | | _ \| |
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| 4 | * / __| | | | |_) | |
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| 5 | * | (__| |_| | _ <| |___
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| 6 | * \___|\___/|_| \_\_____|
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| 7 | *
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| 8 | * Copyright (C) 2012 - 2016, Marc Hoersken, <info@marc-hoersken.de>
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| 9 | * Copyright (C) 2012, Mark Salisbury, <mark.salisbury@hp.com>
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| 10 | * Copyright (C) 2012 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
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| 11 | *
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| 12 | * This software is licensed as described in the file COPYING, which
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| 13 | * you should have received as part of this distribution. The terms
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| 14 | * are also available at https://curl.haxx.se/docs/copyright.html.
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| 15 | *
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| 16 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 17 | * copies of the Software, and permit persons to whom the Software is
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| 18 | * furnished to do so, under the terms of the COPYING file.
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| 19 | *
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| 20 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 21 | * KIND, either express or implied.
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| 22 | *
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| 23 | ***************************************************************************/
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| 24 |
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| 25 | /*
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| 26 | * Source file for all SChannel-specific code for the TLS/SSL layer. No code
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| 27 | * but vtls.c should ever call or use these functions.
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| 28 | *
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| 29 | */
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| 30 |
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| 31 | /*
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| 32 | * Based upon the PolarSSL implementation in polarssl.c and polarssl.h:
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| 33 | * Copyright (C) 2010, 2011, Hoi-Ho Chan, <hoiho.chan@gmail.com>
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| 34 | *
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| 35 | * Based upon the CyaSSL implementation in cyassl.c and cyassl.h:
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| 36 | * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
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| 37 | *
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| 38 | * Thanks for code and inspiration!
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| 39 | */
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| 40 |
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| 41 | #include "curl_setup.h"
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| 42 |
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| 43 | #ifdef USE_SCHANNEL
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| 44 |
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| 45 | #ifndef USE_WINDOWS_SSPI
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| 46 | # error "Can't compile SCHANNEL support without SSPI."
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| 47 | #endif
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| 48 |
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| 49 | #include <schnlsp.h>
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| 50 | #include <schannel.h>
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| 51 | #include "curl_sspi.h"
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| 52 | #include "schannel.h"
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| 53 | #include "vtls.h"
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| 54 | #include "sendf.h"
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| 55 | #include "connect.h" /* for the connect timeout */
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| 56 | #include "strerror.h"
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| 57 | #include "select.h" /* for the socket readyness */
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| 58 | #include "inet_pton.h" /* for IP addr SNI check */
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| 59 | #include "curl_multibyte.h"
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| 60 | #include "warnless.h"
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| 61 | #include "x509asn1.h"
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| 62 | #include "curl_printf.h"
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| 63 | #include "system_win32.h"
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| 64 | #include "hostcheck.h"
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| 65 |
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| 66 | /* The last #include file should be: */
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| 67 | #include "curl_memory.h"
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| 68 | #include "memdebug.h"
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| 69 |
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| 70 | /* ALPN requires version 8.1 of the Windows SDK, which was
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| 71 | shipped with Visual Studio 2013, aka _MSC_VER 1800:
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| 72 |
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| 73 | https://technet.microsoft.com/en-us/library/hh831771%28v=ws.11%29.aspx
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| 74 | */
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| 75 | #if defined(_MSC_VER) && (_MSC_VER >= 1800) && !defined(_USING_V110_SDK71_)
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| 76 | # define HAS_ALPN 1
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| 77 | #endif
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| 78 |
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| 79 | #ifndef UNISP_NAME_A
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| 80 | #define UNISP_NAME_A "Microsoft Unified Security Protocol Provider"
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| 81 | #endif
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| 82 |
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| 83 | #ifndef UNISP_NAME_W
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| 84 | #define UNISP_NAME_W L"Microsoft Unified Security Protocol Provider"
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| 85 | #endif
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| 86 |
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| 87 | #ifndef UNISP_NAME
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| 88 | #ifdef UNICODE
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| 89 | #define UNISP_NAME UNISP_NAME_W
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| 90 | #else
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| 91 | #define UNISP_NAME UNISP_NAME_A
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| 92 | #endif
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| 93 | #endif
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| 94 |
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| 95 | #ifndef SP_PROT_SSL2_CLIENT
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| 96 | #define SP_PROT_SSL2_CLIENT 0x00000008
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| 97 | #endif
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| 98 |
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| 99 | #ifndef SP_PROT_SSL3_CLIENT
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| 100 | #define SP_PROT_SSL3_CLIENT 0x00000008
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| 101 | #endif
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| 102 |
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| 103 | #ifndef SP_PROT_TLS1_CLIENT
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| 104 | #define SP_PROT_TLS1_CLIENT 0x00000080
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| 105 | #endif
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| 106 |
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| 107 | #ifndef SP_PROT_TLS1_0_CLIENT
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| 108 | #define SP_PROT_TLS1_0_CLIENT SP_PROT_TLS1_CLIENT
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| 109 | #endif
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| 110 |
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| 111 | #ifndef SP_PROT_TLS1_1_CLIENT
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| 112 | #define SP_PROT_TLS1_1_CLIENT 0x00000200
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| 113 | #endif
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| 114 |
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| 115 | #ifndef SP_PROT_TLS1_2_CLIENT
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| 116 | #define SP_PROT_TLS1_2_CLIENT 0x00000800
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| 117 | #endif
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| 118 |
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| 119 | #ifndef SECBUFFER_ALERT
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| 120 | #define SECBUFFER_ALERT 17
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| 121 | #endif
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| 122 |
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| 123 | /* Both schannel buffer sizes must be > 0 */
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| 124 | #define CURL_SCHANNEL_BUFFER_INIT_SIZE 4096
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| 125 | #define CURL_SCHANNEL_BUFFER_FREE_SIZE 1024
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| 126 |
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| 127 | /* Uncomment to force verbose output
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| 128 | * #define infof(x, y, ...) printf(y, __VA_ARGS__)
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| 129 | * #define failf(x, y, ...) printf(y, __VA_ARGS__)
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| 130 | */
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| 131 |
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| 132 | /* Structs to store Schannel handles */
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| 133 | struct curl_schannel_cred {
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| 134 | CredHandle cred_handle;
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| 135 | TimeStamp time_stamp;
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| 136 | int refcount;
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| 137 | };
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| 138 |
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| 139 | struct curl_schannel_ctxt {
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| 140 | CtxtHandle ctxt_handle;
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| 141 | TimeStamp time_stamp;
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| 142 | };
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| 143 |
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| 144 | struct ssl_backend_data {
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| 145 | struct curl_schannel_cred *cred;
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| 146 | struct curl_schannel_ctxt *ctxt;
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| 147 | SecPkgContext_StreamSizes stream_sizes;
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| 148 | size_t encdata_length, decdata_length;
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| 149 | size_t encdata_offset, decdata_offset;
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| 150 | unsigned char *encdata_buffer, *decdata_buffer;
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| 151 | /* encdata_is_incomplete: if encdata contains only a partial record that
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| 152 | can't be decrypted without another Curl_read_plain (that is, status is
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| 153 | SEC_E_INCOMPLETE_MESSAGE) then set this true. after Curl_read_plain writes
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| 154 | more bytes into encdata then set this back to false. */
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| 155 | bool encdata_is_incomplete;
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| 156 | unsigned long req_flags, ret_flags;
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| 157 | CURLcode recv_unrecoverable_err; /* schannel_recv had an unrecoverable err */
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| 158 | bool recv_sspi_close_notify; /* true if connection closed by close_notify */
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| 159 | bool recv_connection_closed; /* true if connection closed, regardless how */
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| 160 | bool use_alpn; /* true if ALPN is used for this connection */
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| 161 | };
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| 162 |
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| 163 | #define BACKEND connssl->backend
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| 164 |
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| 165 | static Curl_recv schannel_recv;
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| 166 | static Curl_send schannel_send;
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| 167 |
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| 168 | #ifdef _WIN32_WCE
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| 169 | static CURLcode verify_certificate(struct connectdata *conn, int sockindex);
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| 170 | #endif
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| 171 |
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| 172 | static void InitSecBuffer(SecBuffer *buffer, unsigned long BufType,
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| 173 | void *BufDataPtr, unsigned long BufByteSize)
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| 174 | {
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| 175 | buffer->cbBuffer = BufByteSize;
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| 176 | buffer->BufferType = BufType;
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| 177 | buffer->pvBuffer = BufDataPtr;
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| 178 | }
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| 179 |
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| 180 | static void InitSecBufferDesc(SecBufferDesc *desc, SecBuffer *BufArr,
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| 181 | unsigned long NumArrElem)
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| 182 | {
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| 183 | desc->ulVersion = SECBUFFER_VERSION;
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| 184 | desc->pBuffers = BufArr;
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| 185 | desc->cBuffers = NumArrElem;
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| 186 | }
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| 187 |
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| 188 | static CURLcode
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| 189 | set_ssl_version_min_max(SCHANNEL_CRED *schannel_cred, struct connectdata *conn)
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| 190 | {
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| 191 | struct Curl_easy *data = conn->data;
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| 192 | long ssl_version = SSL_CONN_CONFIG(version);
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| 193 | long ssl_version_max = SSL_CONN_CONFIG(version_max);
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| 194 | long i = ssl_version;
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| 195 |
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| 196 | switch(ssl_version_max) {
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| 197 | case CURL_SSLVERSION_MAX_NONE:
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| 198 | ssl_version_max = ssl_version << 16;
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| 199 | break;
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| 200 | case CURL_SSLVERSION_MAX_DEFAULT:
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| 201 | ssl_version_max = CURL_SSLVERSION_MAX_TLSv1_2;
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| 202 | break;
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| 203 | }
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| 204 | for(; i <= (ssl_version_max >> 16); ++i) {
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| 205 | switch(i) {
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| 206 | case CURL_SSLVERSION_TLSv1_0:
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| 207 | schannel_cred->grbitEnabledProtocols |= SP_PROT_TLS1_0_CLIENT;
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| 208 | break;
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| 209 | case CURL_SSLVERSION_TLSv1_1:
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| 210 | schannel_cred->grbitEnabledProtocols |= SP_PROT_TLS1_1_CLIENT;
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| 211 | break;
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| 212 | case CURL_SSLVERSION_TLSv1_2:
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| 213 | schannel_cred->grbitEnabledProtocols |= SP_PROT_TLS1_2_CLIENT;
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| 214 | break;
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| 215 | case CURL_SSLVERSION_TLSv1_3:
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| 216 | failf(data, "Schannel: TLS 1.3 is not yet supported");
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| 217 | return CURLE_SSL_CONNECT_ERROR;
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| 218 | }
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| 219 | }
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| 220 | return CURLE_OK;
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| 221 | }
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| 222 |
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| 223 | static CURLcode
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| 224 | schannel_connect_step1(struct connectdata *conn, int sockindex)
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| 225 | {
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| 226 | ssize_t written = -1;
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| 227 | struct Curl_easy *data = conn->data;
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| 228 | struct ssl_connect_data *connssl = &conn->ssl[sockindex];
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| 229 | SecBuffer outbuf;
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| 230 | SecBufferDesc outbuf_desc;
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| 231 | SecBuffer inbuf;
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| 232 | SecBufferDesc inbuf_desc;
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| 233 | #ifdef HAS_ALPN
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| 234 | unsigned char alpn_buffer[128];
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| 235 | #endif
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| 236 | SCHANNEL_CRED schannel_cred;
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| 237 | SECURITY_STATUS sspi_status = SEC_E_OK;
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| 238 | struct curl_schannel_cred *old_cred = NULL;
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| 239 | struct in_addr addr;
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| 240 | #ifdef ENABLE_IPV6
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| 241 | struct in6_addr addr6;
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| 242 | #endif
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| 243 | TCHAR *host_name;
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| 244 | CURLcode result;
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| 245 | char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name :
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| 246 | conn->host.name;
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| 247 |
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| 248 | infof(data, "schannel: SSL/TLS connection with %s port %hu (step 1/3)\n",
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| 249 | hostname, conn->remote_port);
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| 250 |
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| 251 | if(Curl_verify_windows_version(5, 1, PLATFORM_WINNT,
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| 252 | VERSION_LESS_THAN_EQUAL)) {
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| 253 | /* SChannel in Windows XP (OS version 5.1) uses legacy handshakes and
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| 254 | algorithms that may not be supported by all servers. */
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| 255 | infof(data, "schannel: WinSSL version is old and may not be able to "
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| 256 | "connect to some servers due to lack of SNI, algorithms, etc.\n");
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| 257 | }
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| 258 |
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| 259 | #ifdef HAS_ALPN
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| 260 | /* ALPN is only supported on Windows 8.1 / Server 2012 R2 and above.
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| 261 | Also it doesn't seem to be supported for Wine, see curl bug #983. */
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| 262 | BACKEND->use_alpn = conn->bits.tls_enable_alpn &&
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| 263 | !GetProcAddress(GetModuleHandleA("ntdll"),
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| 264 | "wine_get_version") &&
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| 265 | Curl_verify_windows_version(6, 3, PLATFORM_WINNT,
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| 266 | VERSION_GREATER_THAN_EQUAL);
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| 267 | #else
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| 268 | BACKEND->use_alpn = false;
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| 269 | #endif
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| 270 |
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| 271 | BACKEND->cred = NULL;
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| 272 |
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| 273 | /* check for an existing re-usable credential handle */
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| 274 | if(SSL_SET_OPTION(primary.sessionid)) {
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| 275 | Curl_ssl_sessionid_lock(conn);
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| 276 | if(!Curl_ssl_getsessionid(conn, (void **)&old_cred, NULL, sockindex)) {
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| 277 | BACKEND->cred = old_cred;
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| 278 | infof(data, "schannel: re-using existing credential handle\n");
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| 279 |
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| 280 | /* increment the reference counter of the credential/session handle */
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| 281 | BACKEND->cred->refcount++;
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| 282 | infof(data, "schannel: incremented credential handle refcount = %d\n",
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| 283 | BACKEND->cred->refcount);
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| 284 | }
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| 285 | Curl_ssl_sessionid_unlock(conn);
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| 286 | }
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| 287 |
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| 288 | if(!BACKEND->cred) {
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| 289 | /* setup Schannel API options */
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| 290 | memset(&schannel_cred, 0, sizeof(schannel_cred));
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| 291 | schannel_cred.dwVersion = SCHANNEL_CRED_VERSION;
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| 292 |
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| 293 | if(conn->ssl_config.verifypeer) {
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| 294 | #ifdef _WIN32_WCE
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| 295 | /* certificate validation on CE doesn't seem to work right; we'll
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| 296 | do it following a more manual process. */
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| 297 | schannel_cred.dwFlags = SCH_CRED_MANUAL_CRED_VALIDATION |
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| 298 | SCH_CRED_IGNORE_NO_REVOCATION_CHECK |
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| 299 | SCH_CRED_IGNORE_REVOCATION_OFFLINE;
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| 300 | #else
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| 301 | schannel_cred.dwFlags = SCH_CRED_AUTO_CRED_VALIDATION;
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| 302 | /* TODO s/data->set.ssl.no_revoke/SSL_SET_OPTION(no_revoke)/g */
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| 303 | if(data->set.ssl.no_revoke)
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| 304 | schannel_cred.dwFlags |= SCH_CRED_IGNORE_NO_REVOCATION_CHECK |
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| 305 | SCH_CRED_IGNORE_REVOCATION_OFFLINE;
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| 306 | else
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| 307 | schannel_cred.dwFlags |= SCH_CRED_REVOCATION_CHECK_CHAIN;
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| 308 | #endif
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| 309 | if(data->set.ssl.no_revoke)
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| 310 | infof(data, "schannel: disabled server certificate revocation "
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| 311 | "checks\n");
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| 312 | else
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| 313 | infof(data, "schannel: checking server certificate revocation\n");
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| 314 | }
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| 315 | else {
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| 316 | schannel_cred.dwFlags = SCH_CRED_MANUAL_CRED_VALIDATION |
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| 317 | SCH_CRED_IGNORE_NO_REVOCATION_CHECK |
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| 318 | SCH_CRED_IGNORE_REVOCATION_OFFLINE;
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| 319 | infof(data, "schannel: disabled server certificate revocation checks\n");
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| 320 | }
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| 321 |
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| 322 | if(!conn->ssl_config.verifyhost) {
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| 323 | schannel_cred.dwFlags |= SCH_CRED_NO_SERVERNAME_CHECK;
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| 324 | infof(data, "schannel: verifyhost setting prevents Schannel from "
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| 325 | "comparing the supplied target name with the subject "
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| 326 | "names in server certificates.\n");
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| 327 | }
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| 328 |
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| 329 | switch(conn->ssl_config.version) {
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| 330 | case CURL_SSLVERSION_DEFAULT:
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| 331 | case CURL_SSLVERSION_TLSv1:
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| 332 | schannel_cred.grbitEnabledProtocols = SP_PROT_TLS1_0_CLIENT |
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| 333 | SP_PROT_TLS1_1_CLIENT |
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| 334 | SP_PROT_TLS1_2_CLIENT;
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| 335 | break;
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| 336 | case CURL_SSLVERSION_TLSv1_0:
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| 337 | case CURL_SSLVERSION_TLSv1_1:
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| 338 | case CURL_SSLVERSION_TLSv1_2:
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| 339 | case CURL_SSLVERSION_TLSv1_3:
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| 340 | {
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| 341 | result = set_ssl_version_min_max(&schannel_cred, conn);
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| 342 | if(result != CURLE_OK)
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| 343 | return result;
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| 344 | break;
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| 345 | }
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| 346 | case CURL_SSLVERSION_SSLv3:
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| 347 | schannel_cred.grbitEnabledProtocols = SP_PROT_SSL3_CLIENT;
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| 348 | break;
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| 349 | case CURL_SSLVERSION_SSLv2:
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| 350 | schannel_cred.grbitEnabledProtocols = SP_PROT_SSL2_CLIENT;
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| 351 | break;
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| 352 | default:
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| 353 | failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION");
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| 354 | return CURLE_SSL_CONNECT_ERROR;
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| 355 | }
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| 356 |
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| 357 | /* allocate memory for the re-usable credential handle */
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| 358 | BACKEND->cred = (struct curl_schannel_cred *)
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| 359 | malloc(sizeof(struct curl_schannel_cred));
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| 360 | if(!BACKEND->cred) {
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| 361 | failf(data, "schannel: unable to allocate memory");
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| 362 | return CURLE_OUT_OF_MEMORY;
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| 363 | }
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| 364 | memset(BACKEND->cred, 0, sizeof(struct curl_schannel_cred));
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| 365 | BACKEND->cred->refcount = 1;
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| 366 |
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| 367 | /* https://msdn.microsoft.com/en-us/library/windows/desktop/aa374716.aspx
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| 368 | */
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| 369 | sspi_status =
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| 370 | s_pSecFn->AcquireCredentialsHandle(NULL, (TCHAR *)UNISP_NAME,
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| 371 | SECPKG_CRED_OUTBOUND, NULL,
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| 372 | &schannel_cred, NULL, NULL,
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| 373 | &BACKEND->cred->cred_handle,
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| 374 | &BACKEND->cred->time_stamp);
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| 375 |
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| 376 | if(sspi_status != SEC_E_OK) {
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| 377 | if(sspi_status == SEC_E_WRONG_PRINCIPAL)
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| 378 | failf(data, "schannel: SNI or certificate check failed: %s",
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| 379 | Curl_sspi_strerror(conn, sspi_status));
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| 380 | else
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| 381 | failf(data, "schannel: AcquireCredentialsHandle failed: %s",
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| 382 | Curl_sspi_strerror(conn, sspi_status));
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| 383 | Curl_safefree(BACKEND->cred);
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| 384 | return CURLE_SSL_CONNECT_ERROR;
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| 385 | }
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| 386 | }
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| 387 |
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| 388 | /* Warn if SNI is disabled due to use of an IP address */
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| 389 | if(Curl_inet_pton(AF_INET, hostname, &addr)
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| 390 | #ifdef ENABLE_IPV6
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| 391 | || Curl_inet_pton(AF_INET6, hostname, &addr6)
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| 392 | #endif
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| 393 | ) {
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| 394 | infof(data, "schannel: using IP address, SNI is not supported by OS.\n");
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| 395 | }
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| 396 |
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| 397 | #ifdef HAS_ALPN
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| 398 | if(BACKEND->use_alpn) {
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| 399 | int cur = 0;
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| 400 | int list_start_index = 0;
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| 401 | unsigned int *extension_len = NULL;
|
---|
| 402 | unsigned short* list_len = NULL;
|
---|
| 403 |
|
---|
| 404 | /* The first four bytes will be an unsigned int indicating number
|
---|
| 405 | of bytes of data in the rest of the the buffer. */
|
---|
| 406 | extension_len = (unsigned int *)(&alpn_buffer[cur]);
|
---|
| 407 | cur += sizeof(unsigned int);
|
---|
| 408 |
|
---|
| 409 | /* The next four bytes are an indicator that this buffer will contain
|
---|
| 410 | ALPN data, as opposed to NPN, for example. */
|
---|
| 411 | *(unsigned int *)&alpn_buffer[cur] =
|
---|
| 412 | SecApplicationProtocolNegotiationExt_ALPN;
|
---|
| 413 | cur += sizeof(unsigned int);
|
---|
| 414 |
|
---|
| 415 | /* The next two bytes will be an unsigned short indicating the number
|
---|
| 416 | of bytes used to list the preferred protocols. */
|
---|
| 417 | list_len = (unsigned short*)(&alpn_buffer[cur]);
|
---|
| 418 | cur += sizeof(unsigned short);
|
---|
| 419 |
|
---|
| 420 | list_start_index = cur;
|
---|
| 421 |
|
---|
| 422 | #ifdef USE_NGHTTP2
|
---|
| 423 | if(data->set.httpversion >= CURL_HTTP_VERSION_2) {
|
---|
| 424 | memcpy(&alpn_buffer[cur], NGHTTP2_PROTO_ALPN, NGHTTP2_PROTO_ALPN_LEN);
|
---|
| 425 | cur += NGHTTP2_PROTO_ALPN_LEN;
|
---|
| 426 | infof(data, "schannel: ALPN, offering %s\n", NGHTTP2_PROTO_VERSION_ID);
|
---|
| 427 | }
|
---|
| 428 | #endif
|
---|
| 429 |
|
---|
| 430 | alpn_buffer[cur++] = ALPN_HTTP_1_1_LENGTH;
|
---|
| 431 | memcpy(&alpn_buffer[cur], ALPN_HTTP_1_1, ALPN_HTTP_1_1_LENGTH);
|
---|
| 432 | cur += ALPN_HTTP_1_1_LENGTH;
|
---|
| 433 | infof(data, "schannel: ALPN, offering %s\n", ALPN_HTTP_1_1);
|
---|
| 434 |
|
---|
| 435 | *list_len = curlx_uitous(cur - list_start_index);
|
---|
| 436 | *extension_len = *list_len + sizeof(unsigned int) + sizeof(unsigned short);
|
---|
| 437 |
|
---|
| 438 | InitSecBuffer(&inbuf, SECBUFFER_APPLICATION_PROTOCOLS, alpn_buffer, cur);
|
---|
| 439 | InitSecBufferDesc(&inbuf_desc, &inbuf, 1);
|
---|
| 440 | }
|
---|
| 441 | else
|
---|
| 442 | {
|
---|
| 443 | InitSecBuffer(&inbuf, SECBUFFER_EMPTY, NULL, 0);
|
---|
| 444 | InitSecBufferDesc(&inbuf_desc, &inbuf, 1);
|
---|
| 445 | }
|
---|
| 446 | #else /* HAS_ALPN */
|
---|
| 447 | InitSecBuffer(&inbuf, SECBUFFER_EMPTY, NULL, 0);
|
---|
| 448 | InitSecBufferDesc(&inbuf_desc, &inbuf, 1);
|
---|
| 449 | #endif
|
---|
| 450 |
|
---|
| 451 | /* setup output buffer */
|
---|
| 452 | InitSecBuffer(&outbuf, SECBUFFER_EMPTY, NULL, 0);
|
---|
| 453 | InitSecBufferDesc(&outbuf_desc, &outbuf, 1);
|
---|
| 454 |
|
---|
| 455 | /* setup request flags */
|
---|
| 456 | BACKEND->req_flags = ISC_REQ_SEQUENCE_DETECT | ISC_REQ_REPLAY_DETECT |
|
---|
| 457 | ISC_REQ_CONFIDENTIALITY | ISC_REQ_ALLOCATE_MEMORY |
|
---|
| 458 | ISC_REQ_STREAM;
|
---|
| 459 |
|
---|
| 460 | /* allocate memory for the security context handle */
|
---|
| 461 | BACKEND->ctxt = (struct curl_schannel_ctxt *)
|
---|
| 462 | malloc(sizeof(struct curl_schannel_ctxt));
|
---|
| 463 | if(!BACKEND->ctxt) {
|
---|
| 464 | failf(data, "schannel: unable to allocate memory");
|
---|
| 465 | return CURLE_OUT_OF_MEMORY;
|
---|
| 466 | }
|
---|
| 467 | memset(BACKEND->ctxt, 0, sizeof(struct curl_schannel_ctxt));
|
---|
| 468 |
|
---|
| 469 | host_name = Curl_convert_UTF8_to_tchar(hostname);
|
---|
| 470 | if(!host_name)
|
---|
| 471 | return CURLE_OUT_OF_MEMORY;
|
---|
| 472 |
|
---|
| 473 | /* Schannel InitializeSecurityContext:
|
---|
| 474 | https://msdn.microsoft.com/en-us/library/windows/desktop/aa375924.aspx
|
---|
| 475 |
|
---|
| 476 | At the moment we don't pass inbuf unless we're using ALPN since we only
|
---|
| 477 | use it for that, and Wine (for which we currently disable ALPN) is giving
|
---|
| 478 | us problems with inbuf regardless. https://github.com/curl/curl/issues/983
|
---|
| 479 | */
|
---|
| 480 | sspi_status = s_pSecFn->InitializeSecurityContext(
|
---|
| 481 | &BACKEND->cred->cred_handle, NULL, host_name, BACKEND->req_flags, 0, 0,
|
---|
| 482 | (BACKEND->use_alpn ? &inbuf_desc : NULL),
|
---|
| 483 | 0, &BACKEND->ctxt->ctxt_handle,
|
---|
| 484 | &outbuf_desc, &BACKEND->ret_flags, &BACKEND->ctxt->time_stamp);
|
---|
| 485 |
|
---|
| 486 | Curl_unicodefree(host_name);
|
---|
| 487 |
|
---|
| 488 | if(sspi_status != SEC_I_CONTINUE_NEEDED) {
|
---|
| 489 | if(sspi_status == SEC_E_WRONG_PRINCIPAL)
|
---|
| 490 | failf(data, "schannel: SNI or certificate check failed: %s",
|
---|
| 491 | Curl_sspi_strerror(conn, sspi_status));
|
---|
| 492 | else
|
---|
| 493 | failf(data, "schannel: initial InitializeSecurityContext failed: %s",
|
---|
| 494 | Curl_sspi_strerror(conn, sspi_status));
|
---|
| 495 | Curl_safefree(BACKEND->ctxt);
|
---|
| 496 | return CURLE_SSL_CONNECT_ERROR;
|
---|
| 497 | }
|
---|
| 498 |
|
---|
| 499 | infof(data, "schannel: sending initial handshake data: "
|
---|
| 500 | "sending %lu bytes...\n", outbuf.cbBuffer);
|
---|
| 501 |
|
---|
| 502 | /* send initial handshake data which is now stored in output buffer */
|
---|
| 503 | result = Curl_write_plain(conn, conn->sock[sockindex], outbuf.pvBuffer,
|
---|
| 504 | outbuf.cbBuffer, &written);
|
---|
| 505 | s_pSecFn->FreeContextBuffer(outbuf.pvBuffer);
|
---|
| 506 | if((result != CURLE_OK) || (outbuf.cbBuffer != (size_t) written)) {
|
---|
| 507 | failf(data, "schannel: failed to send initial handshake data: "
|
---|
| 508 | "sent %zd of %lu bytes", written, outbuf.cbBuffer);
|
---|
| 509 | return CURLE_SSL_CONNECT_ERROR;
|
---|
| 510 | }
|
---|
| 511 |
|
---|
| 512 | infof(data, "schannel: sent initial handshake data: "
|
---|
| 513 | "sent %zd bytes\n", written);
|
---|
| 514 |
|
---|
| 515 | BACKEND->recv_unrecoverable_err = CURLE_OK;
|
---|
| 516 | BACKEND->recv_sspi_close_notify = false;
|
---|
| 517 | BACKEND->recv_connection_closed = false;
|
---|
| 518 | BACKEND->encdata_is_incomplete = false;
|
---|
| 519 |
|
---|
| 520 | /* continue to second handshake step */
|
---|
| 521 | connssl->connecting_state = ssl_connect_2;
|
---|
| 522 |
|
---|
| 523 | return CURLE_OK;
|
---|
| 524 | }
|
---|
| 525 |
|
---|
| 526 | static CURLcode
|
---|
| 527 | schannel_connect_step2(struct connectdata *conn, int sockindex)
|
---|
| 528 | {
|
---|
| 529 | int i;
|
---|
| 530 | ssize_t nread = -1, written = -1;
|
---|
| 531 | struct Curl_easy *data = conn->data;
|
---|
| 532 | struct ssl_connect_data *connssl = &conn->ssl[sockindex];
|
---|
| 533 | unsigned char *reallocated_buffer;
|
---|
| 534 | size_t reallocated_length;
|
---|
| 535 | SecBuffer outbuf[3];
|
---|
| 536 | SecBufferDesc outbuf_desc;
|
---|
| 537 | SecBuffer inbuf[2];
|
---|
| 538 | SecBufferDesc inbuf_desc;
|
---|
| 539 | SECURITY_STATUS sspi_status = SEC_E_OK;
|
---|
| 540 | TCHAR *host_name;
|
---|
| 541 | CURLcode result;
|
---|
| 542 | bool doread;
|
---|
| 543 | char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name :
|
---|
| 544 | conn->host.name;
|
---|
| 545 |
|
---|
| 546 | doread = (connssl->connecting_state != ssl_connect_2_writing) ? TRUE : FALSE;
|
---|
| 547 |
|
---|
| 548 | infof(data, "schannel: SSL/TLS connection with %s port %hu (step 2/3)\n",
|
---|
| 549 | hostname, conn->remote_port);
|
---|
| 550 |
|
---|
| 551 | if(!BACKEND->cred || !BACKEND->ctxt)
|
---|
| 552 | return CURLE_SSL_CONNECT_ERROR;
|
---|
| 553 |
|
---|
| 554 | /* buffer to store previously received and decrypted data */
|
---|
| 555 | if(BACKEND->decdata_buffer == NULL) {
|
---|
| 556 | BACKEND->decdata_offset = 0;
|
---|
| 557 | BACKEND->decdata_length = CURL_SCHANNEL_BUFFER_INIT_SIZE;
|
---|
| 558 | BACKEND->decdata_buffer = malloc(BACKEND->decdata_length);
|
---|
| 559 | if(BACKEND->decdata_buffer == NULL) {
|
---|
| 560 | failf(data, "schannel: unable to allocate memory");
|
---|
| 561 | return CURLE_OUT_OF_MEMORY;
|
---|
| 562 | }
|
---|
| 563 | }
|
---|
| 564 |
|
---|
| 565 | /* buffer to store previously received and encrypted data */
|
---|
| 566 | if(BACKEND->encdata_buffer == NULL) {
|
---|
| 567 | BACKEND->encdata_is_incomplete = false;
|
---|
| 568 | BACKEND->encdata_offset = 0;
|
---|
| 569 | BACKEND->encdata_length = CURL_SCHANNEL_BUFFER_INIT_SIZE;
|
---|
| 570 | BACKEND->encdata_buffer = malloc(BACKEND->encdata_length);
|
---|
| 571 | if(BACKEND->encdata_buffer == NULL) {
|
---|
| 572 | failf(data, "schannel: unable to allocate memory");
|
---|
| 573 | return CURLE_OUT_OF_MEMORY;
|
---|
| 574 | }
|
---|
| 575 | }
|
---|
| 576 |
|
---|
| 577 | /* if we need a bigger buffer to read a full message, increase buffer now */
|
---|
| 578 | if(BACKEND->encdata_length - BACKEND->encdata_offset <
|
---|
| 579 | CURL_SCHANNEL_BUFFER_FREE_SIZE) {
|
---|
| 580 | /* increase internal encrypted data buffer */
|
---|
| 581 | reallocated_length = BACKEND->encdata_offset +
|
---|
| 582 | CURL_SCHANNEL_BUFFER_FREE_SIZE;
|
---|
| 583 | reallocated_buffer = realloc(BACKEND->encdata_buffer,
|
---|
| 584 | reallocated_length);
|
---|
| 585 |
|
---|
| 586 | if(reallocated_buffer == NULL) {
|
---|
| 587 | failf(data, "schannel: unable to re-allocate memory");
|
---|
| 588 | return CURLE_OUT_OF_MEMORY;
|
---|
| 589 | }
|
---|
| 590 | else {
|
---|
| 591 | BACKEND->encdata_buffer = reallocated_buffer;
|
---|
| 592 | BACKEND->encdata_length = reallocated_length;
|
---|
| 593 | }
|
---|
| 594 | }
|
---|
| 595 |
|
---|
| 596 | for(;;) {
|
---|
| 597 | if(doread) {
|
---|
| 598 | /* read encrypted handshake data from socket */
|
---|
| 599 | result = Curl_read_plain(conn->sock[sockindex],
|
---|
| 600 | (char *) (BACKEND->encdata_buffer +
|
---|
| 601 | BACKEND->encdata_offset),
|
---|
| 602 | BACKEND->encdata_length -
|
---|
| 603 | BACKEND->encdata_offset,
|
---|
| 604 | &nread);
|
---|
| 605 | if(result == CURLE_AGAIN) {
|
---|
| 606 | if(connssl->connecting_state != ssl_connect_2_writing)
|
---|
| 607 | connssl->connecting_state = ssl_connect_2_reading;
|
---|
| 608 | infof(data, "schannel: failed to receive handshake, "
|
---|
| 609 | "need more data\n");
|
---|
| 610 | return CURLE_OK;
|
---|
| 611 | }
|
---|
| 612 | else if((result != CURLE_OK) || (nread == 0)) {
|
---|
| 613 | failf(data, "schannel: failed to receive handshake, "
|
---|
| 614 | "SSL/TLS connection failed");
|
---|
| 615 | return CURLE_SSL_CONNECT_ERROR;
|
---|
| 616 | }
|
---|
| 617 |
|
---|
| 618 | /* increase encrypted data buffer offset */
|
---|
| 619 | BACKEND->encdata_offset += nread;
|
---|
| 620 | BACKEND->encdata_is_incomplete = false;
|
---|
| 621 | infof(data, "schannel: encrypted data got %zd\n", nread);
|
---|
| 622 | }
|
---|
| 623 |
|
---|
| 624 | infof(data, "schannel: encrypted data buffer: offset %zu length %zu\n",
|
---|
| 625 | BACKEND->encdata_offset, BACKEND->encdata_length);
|
---|
| 626 |
|
---|
| 627 | /* setup input buffers */
|
---|
| 628 | InitSecBuffer(&inbuf[0], SECBUFFER_TOKEN, malloc(BACKEND->encdata_offset),
|
---|
| 629 | curlx_uztoul(BACKEND->encdata_offset));
|
---|
| 630 | InitSecBuffer(&inbuf[1], SECBUFFER_EMPTY, NULL, 0);
|
---|
| 631 | InitSecBufferDesc(&inbuf_desc, inbuf, 2);
|
---|
| 632 |
|
---|
| 633 | /* setup output buffers */
|
---|
| 634 | InitSecBuffer(&outbuf[0], SECBUFFER_TOKEN, NULL, 0);
|
---|
| 635 | InitSecBuffer(&outbuf[1], SECBUFFER_ALERT, NULL, 0);
|
---|
| 636 | InitSecBuffer(&outbuf[2], SECBUFFER_EMPTY, NULL, 0);
|
---|
| 637 | InitSecBufferDesc(&outbuf_desc, outbuf, 3);
|
---|
| 638 |
|
---|
| 639 | if(inbuf[0].pvBuffer == NULL) {
|
---|
| 640 | failf(data, "schannel: unable to allocate memory");
|
---|
| 641 | return CURLE_OUT_OF_MEMORY;
|
---|
| 642 | }
|
---|
| 643 |
|
---|
| 644 | /* copy received handshake data into input buffer */
|
---|
| 645 | memcpy(inbuf[0].pvBuffer, BACKEND->encdata_buffer,
|
---|
| 646 | BACKEND->encdata_offset);
|
---|
| 647 |
|
---|
| 648 | host_name = Curl_convert_UTF8_to_tchar(hostname);
|
---|
| 649 | if(!host_name)
|
---|
| 650 | return CURLE_OUT_OF_MEMORY;
|
---|
| 651 |
|
---|
| 652 | /* https://msdn.microsoft.com/en-us/library/windows/desktop/aa375924.aspx
|
---|
| 653 | */
|
---|
| 654 | sspi_status = s_pSecFn->InitializeSecurityContext(
|
---|
| 655 | &BACKEND->cred->cred_handle, &BACKEND->ctxt->ctxt_handle,
|
---|
| 656 | host_name, BACKEND->req_flags, 0, 0, &inbuf_desc, 0, NULL,
|
---|
| 657 | &outbuf_desc, &BACKEND->ret_flags, &BACKEND->ctxt->time_stamp);
|
---|
| 658 |
|
---|
| 659 | Curl_unicodefree(host_name);
|
---|
| 660 |
|
---|
| 661 | /* free buffer for received handshake data */
|
---|
| 662 | Curl_safefree(inbuf[0].pvBuffer);
|
---|
| 663 |
|
---|
| 664 | /* check if the handshake was incomplete */
|
---|
| 665 | if(sspi_status == SEC_E_INCOMPLETE_MESSAGE) {
|
---|
| 666 | BACKEND->encdata_is_incomplete = true;
|
---|
| 667 | connssl->connecting_state = ssl_connect_2_reading;
|
---|
| 668 | infof(data, "schannel: received incomplete message, need more data\n");
|
---|
| 669 | return CURLE_OK;
|
---|
| 670 | }
|
---|
| 671 |
|
---|
| 672 | /* If the server has requested a client certificate, attempt to continue
|
---|
| 673 | the handshake without one. This will allow connections to servers which
|
---|
| 674 | request a client certificate but do not require it. */
|
---|
| 675 | if(sspi_status == SEC_I_INCOMPLETE_CREDENTIALS &&
|
---|
| 676 | !(BACKEND->req_flags & ISC_REQ_USE_SUPPLIED_CREDS)) {
|
---|
| 677 | BACKEND->req_flags |= ISC_REQ_USE_SUPPLIED_CREDS;
|
---|
| 678 | connssl->connecting_state = ssl_connect_2_writing;
|
---|
| 679 | infof(data, "schannel: a client certificate has been requested\n");
|
---|
| 680 | return CURLE_OK;
|
---|
| 681 | }
|
---|
| 682 |
|
---|
| 683 | /* check if the handshake needs to be continued */
|
---|
| 684 | if(sspi_status == SEC_I_CONTINUE_NEEDED || sspi_status == SEC_E_OK) {
|
---|
| 685 | for(i = 0; i < 3; i++) {
|
---|
| 686 | /* search for handshake tokens that need to be send */
|
---|
| 687 | if(outbuf[i].BufferType == SECBUFFER_TOKEN && outbuf[i].cbBuffer > 0) {
|
---|
| 688 | infof(data, "schannel: sending next handshake data: "
|
---|
| 689 | "sending %lu bytes...\n", outbuf[i].cbBuffer);
|
---|
| 690 |
|
---|
| 691 | /* send handshake token to server */
|
---|
| 692 | result = Curl_write_plain(conn, conn->sock[sockindex],
|
---|
| 693 | outbuf[i].pvBuffer, outbuf[i].cbBuffer,
|
---|
| 694 | &written);
|
---|
| 695 | if((result != CURLE_OK) ||
|
---|
| 696 | (outbuf[i].cbBuffer != (size_t) written)) {
|
---|
| 697 | failf(data, "schannel: failed to send next handshake data: "
|
---|
| 698 | "sent %zd of %lu bytes", written, outbuf[i].cbBuffer);
|
---|
| 699 | return CURLE_SSL_CONNECT_ERROR;
|
---|
| 700 | }
|
---|
| 701 | }
|
---|
| 702 |
|
---|
| 703 | /* free obsolete buffer */
|
---|
| 704 | if(outbuf[i].pvBuffer != NULL) {
|
---|
| 705 | s_pSecFn->FreeContextBuffer(outbuf[i].pvBuffer);
|
---|
| 706 | }
|
---|
| 707 | }
|
---|
| 708 | }
|
---|
| 709 | else {
|
---|
| 710 | if(sspi_status == SEC_E_WRONG_PRINCIPAL)
|
---|
| 711 | failf(data, "schannel: SNI or certificate check failed: %s",
|
---|
| 712 | Curl_sspi_strerror(conn, sspi_status));
|
---|
| 713 | else
|
---|
| 714 | failf(data, "schannel: next InitializeSecurityContext failed: %s",
|
---|
| 715 | Curl_sspi_strerror(conn, sspi_status));
|
---|
| 716 | return sspi_status == SEC_E_UNTRUSTED_ROOT ?
|
---|
| 717 | CURLE_SSL_CACERT : CURLE_SSL_CONNECT_ERROR;
|
---|
| 718 | }
|
---|
| 719 |
|
---|
| 720 | /* check if there was additional remaining encrypted data */
|
---|
| 721 | if(inbuf[1].BufferType == SECBUFFER_EXTRA && inbuf[1].cbBuffer > 0) {
|
---|
| 722 | infof(data, "schannel: encrypted data length: %lu\n", inbuf[1].cbBuffer);
|
---|
| 723 | /*
|
---|
| 724 | There are two cases where we could be getting extra data here:
|
---|
| 725 | 1) If we're renegotiating a connection and the handshake is already
|
---|
| 726 | complete (from the server perspective), it can encrypted app data
|
---|
| 727 | (not handshake data) in an extra buffer at this point.
|
---|
| 728 | 2) (sspi_status == SEC_I_CONTINUE_NEEDED) We are negotiating a
|
---|
| 729 | connection and this extra data is part of the handshake.
|
---|
| 730 | We should process the data immediately; waiting for the socket to
|
---|
| 731 | be ready may fail since the server is done sending handshake data.
|
---|
| 732 | */
|
---|
| 733 | /* check if the remaining data is less than the total amount
|
---|
| 734 | and therefore begins after the already processed data */
|
---|
| 735 | if(BACKEND->encdata_offset > inbuf[1].cbBuffer) {
|
---|
| 736 | memmove(BACKEND->encdata_buffer,
|
---|
| 737 | (BACKEND->encdata_buffer + BACKEND->encdata_offset) -
|
---|
| 738 | inbuf[1].cbBuffer, inbuf[1].cbBuffer);
|
---|
| 739 | BACKEND->encdata_offset = inbuf[1].cbBuffer;
|
---|
| 740 | if(sspi_status == SEC_I_CONTINUE_NEEDED) {
|
---|
| 741 | doread = FALSE;
|
---|
| 742 | continue;
|
---|
| 743 | }
|
---|
| 744 | }
|
---|
| 745 | }
|
---|
| 746 | else {
|
---|
| 747 | BACKEND->encdata_offset = 0;
|
---|
| 748 | }
|
---|
| 749 | break;
|
---|
| 750 | }
|
---|
| 751 |
|
---|
| 752 | /* check if the handshake needs to be continued */
|
---|
| 753 | if(sspi_status == SEC_I_CONTINUE_NEEDED) {
|
---|
| 754 | connssl->connecting_state = ssl_connect_2_reading;
|
---|
| 755 | return CURLE_OK;
|
---|
| 756 | }
|
---|
| 757 |
|
---|
| 758 | /* check if the handshake is complete */
|
---|
| 759 | if(sspi_status == SEC_E_OK) {
|
---|
| 760 | connssl->connecting_state = ssl_connect_3;
|
---|
| 761 | infof(data, "schannel: SSL/TLS handshake complete\n");
|
---|
| 762 | }
|
---|
| 763 |
|
---|
| 764 | #ifdef _WIN32_WCE
|
---|
| 765 | /* Windows CE doesn't do any server certificate validation.
|
---|
| 766 | We have to do it manually. */
|
---|
| 767 | if(conn->ssl_config.verifypeer)
|
---|
| 768 | return verify_certificate(conn, sockindex);
|
---|
| 769 | #endif
|
---|
| 770 |
|
---|
| 771 | return CURLE_OK;
|
---|
| 772 | }
|
---|
| 773 |
|
---|
| 774 | static CURLcode
|
---|
| 775 | schannel_connect_step3(struct connectdata *conn, int sockindex)
|
---|
| 776 | {
|
---|
| 777 | CURLcode result = CURLE_OK;
|
---|
| 778 | struct Curl_easy *data = conn->data;
|
---|
| 779 | struct ssl_connect_data *connssl = &conn->ssl[sockindex];
|
---|
| 780 | SECURITY_STATUS sspi_status = SEC_E_OK;
|
---|
| 781 | CERT_CONTEXT *ccert_context = NULL;
|
---|
| 782 | #ifndef CURL_DISABLE_VERBOSE_STRINGS
|
---|
| 783 | const char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name :
|
---|
| 784 | conn->host.name;
|
---|
| 785 | #endif
|
---|
| 786 | #ifdef HAS_ALPN
|
---|
| 787 | SecPkgContext_ApplicationProtocol alpn_result;
|
---|
| 788 | #endif
|
---|
| 789 |
|
---|
| 790 | DEBUGASSERT(ssl_connect_3 == connssl->connecting_state);
|
---|
| 791 |
|
---|
| 792 | infof(data, "schannel: SSL/TLS connection with %s port %hu (step 3/3)\n",
|
---|
| 793 | hostname, conn->remote_port);
|
---|
| 794 |
|
---|
| 795 | if(!BACKEND->cred)
|
---|
| 796 | return CURLE_SSL_CONNECT_ERROR;
|
---|
| 797 |
|
---|
| 798 | /* check if the required context attributes are met */
|
---|
| 799 | if(BACKEND->ret_flags != BACKEND->req_flags) {
|
---|
| 800 | if(!(BACKEND->ret_flags & ISC_RET_SEQUENCE_DETECT))
|
---|
| 801 | failf(data, "schannel: failed to setup sequence detection");
|
---|
| 802 | if(!(BACKEND->ret_flags & ISC_RET_REPLAY_DETECT))
|
---|
| 803 | failf(data, "schannel: failed to setup replay detection");
|
---|
| 804 | if(!(BACKEND->ret_flags & ISC_RET_CONFIDENTIALITY))
|
---|
| 805 | failf(data, "schannel: failed to setup confidentiality");
|
---|
| 806 | if(!(BACKEND->ret_flags & ISC_RET_ALLOCATED_MEMORY))
|
---|
| 807 | failf(data, "schannel: failed to setup memory allocation");
|
---|
| 808 | if(!(BACKEND->ret_flags & ISC_RET_STREAM))
|
---|
| 809 | failf(data, "schannel: failed to setup stream orientation");
|
---|
| 810 | return CURLE_SSL_CONNECT_ERROR;
|
---|
| 811 | }
|
---|
| 812 |
|
---|
| 813 | #ifdef HAS_ALPN
|
---|
| 814 | if(BACKEND->use_alpn) {
|
---|
| 815 | sspi_status = s_pSecFn->QueryContextAttributes(&BACKEND->ctxt->ctxt_handle,
|
---|
| 816 | SECPKG_ATTR_APPLICATION_PROTOCOL, &alpn_result);
|
---|
| 817 |
|
---|
| 818 | if(sspi_status != SEC_E_OK) {
|
---|
| 819 | failf(data, "schannel: failed to retrieve ALPN result");
|
---|
| 820 | return CURLE_SSL_CONNECT_ERROR;
|
---|
| 821 | }
|
---|
| 822 |
|
---|
| 823 | if(alpn_result.ProtoNegoStatus ==
|
---|
| 824 | SecApplicationProtocolNegotiationStatus_Success) {
|
---|
| 825 |
|
---|
| 826 | infof(data, "schannel: ALPN, server accepted to use %.*s\n",
|
---|
| 827 | alpn_result.ProtocolIdSize, alpn_result.ProtocolId);
|
---|
| 828 |
|
---|
| 829 | #ifdef USE_NGHTTP2
|
---|
| 830 | if(alpn_result.ProtocolIdSize == NGHTTP2_PROTO_VERSION_ID_LEN &&
|
---|
| 831 | !memcmp(NGHTTP2_PROTO_VERSION_ID, alpn_result.ProtocolId,
|
---|
| 832 | NGHTTP2_PROTO_VERSION_ID_LEN)) {
|
---|
| 833 | conn->negnpn = CURL_HTTP_VERSION_2;
|
---|
| 834 | }
|
---|
| 835 | else
|
---|
| 836 | #endif
|
---|
| 837 | if(alpn_result.ProtocolIdSize == ALPN_HTTP_1_1_LENGTH &&
|
---|
| 838 | !memcmp(ALPN_HTTP_1_1, alpn_result.ProtocolId,
|
---|
| 839 | ALPN_HTTP_1_1_LENGTH)) {
|
---|
| 840 | conn->negnpn = CURL_HTTP_VERSION_1_1;
|
---|
| 841 | }
|
---|
| 842 | }
|
---|
| 843 | else
|
---|
| 844 | infof(data, "ALPN, server did not agree to a protocol\n");
|
---|
| 845 | }
|
---|
| 846 | #endif
|
---|
| 847 |
|
---|
| 848 | /* save the current session data for possible re-use */
|
---|
| 849 | if(SSL_SET_OPTION(primary.sessionid)) {
|
---|
| 850 | bool incache;
|
---|
| 851 | struct curl_schannel_cred *old_cred = NULL;
|
---|
| 852 |
|
---|
| 853 | Curl_ssl_sessionid_lock(conn);
|
---|
| 854 | incache = !(Curl_ssl_getsessionid(conn, (void **)&old_cred, NULL,
|
---|
| 855 | sockindex));
|
---|
| 856 | if(incache) {
|
---|
| 857 | if(old_cred != BACKEND->cred) {
|
---|
| 858 | infof(data, "schannel: old credential handle is stale, removing\n");
|
---|
| 859 | /* we're not taking old_cred ownership here, no refcount++ is needed */
|
---|
| 860 | Curl_ssl_delsessionid(conn, (void *)old_cred);
|
---|
| 861 | incache = FALSE;
|
---|
| 862 | }
|
---|
| 863 | }
|
---|
| 864 | if(!incache) {
|
---|
| 865 | result = Curl_ssl_addsessionid(conn, (void *)BACKEND->cred,
|
---|
| 866 | sizeof(struct curl_schannel_cred),
|
---|
| 867 | sockindex);
|
---|
| 868 | if(result) {
|
---|
| 869 | Curl_ssl_sessionid_unlock(conn);
|
---|
| 870 | failf(data, "schannel: failed to store credential handle");
|
---|
| 871 | return result;
|
---|
| 872 | }
|
---|
| 873 | else {
|
---|
| 874 | /* this cred session is now also referenced by sessionid cache */
|
---|
| 875 | BACKEND->cred->refcount++;
|
---|
| 876 | infof(data, "schannel: stored credential handle in session cache\n");
|
---|
| 877 | }
|
---|
| 878 | }
|
---|
| 879 | Curl_ssl_sessionid_unlock(conn);
|
---|
| 880 | }
|
---|
| 881 |
|
---|
| 882 | if(data->set.ssl.certinfo) {
|
---|
| 883 | sspi_status = s_pSecFn->QueryContextAttributes(&BACKEND->ctxt->ctxt_handle,
|
---|
| 884 | SECPKG_ATTR_REMOTE_CERT_CONTEXT, &ccert_context);
|
---|
| 885 |
|
---|
| 886 | if((sspi_status != SEC_E_OK) || (ccert_context == NULL)) {
|
---|
| 887 | failf(data, "schannel: failed to retrieve remote cert context");
|
---|
| 888 | return CURLE_SSL_CONNECT_ERROR;
|
---|
| 889 | }
|
---|
| 890 |
|
---|
| 891 | result = Curl_ssl_init_certinfo(data, 1);
|
---|
| 892 | if(!result) {
|
---|
| 893 | if(((ccert_context->dwCertEncodingType & X509_ASN_ENCODING) != 0) &&
|
---|
| 894 | (ccert_context->cbCertEncoded > 0)) {
|
---|
| 895 |
|
---|
| 896 | const char *beg = (const char *) ccert_context->pbCertEncoded;
|
---|
| 897 | const char *end = beg + ccert_context->cbCertEncoded;
|
---|
| 898 | result = Curl_extract_certinfo(conn, 0, beg, end);
|
---|
| 899 | }
|
---|
| 900 | }
|
---|
| 901 | CertFreeCertificateContext(ccert_context);
|
---|
| 902 | if(result)
|
---|
| 903 | return result;
|
---|
| 904 | }
|
---|
| 905 |
|
---|
| 906 | connssl->connecting_state = ssl_connect_done;
|
---|
| 907 |
|
---|
| 908 | return CURLE_OK;
|
---|
| 909 | }
|
---|
| 910 |
|
---|
| 911 | static CURLcode
|
---|
| 912 | schannel_connect_common(struct connectdata *conn, int sockindex,
|
---|
| 913 | bool nonblocking, bool *done)
|
---|
| 914 | {
|
---|
| 915 | CURLcode result;
|
---|
| 916 | struct Curl_easy *data = conn->data;
|
---|
| 917 | struct ssl_connect_data *connssl = &conn->ssl[sockindex];
|
---|
| 918 | curl_socket_t sockfd = conn->sock[sockindex];
|
---|
| 919 | time_t timeout_ms;
|
---|
| 920 | int what;
|
---|
| 921 |
|
---|
| 922 | /* check if the connection has already been established */
|
---|
| 923 | if(ssl_connection_complete == connssl->state) {
|
---|
| 924 | *done = TRUE;
|
---|
| 925 | return CURLE_OK;
|
---|
| 926 | }
|
---|
| 927 |
|
---|
| 928 | if(ssl_connect_1 == connssl->connecting_state) {
|
---|
| 929 | /* check out how much more time we're allowed */
|
---|
| 930 | timeout_ms = Curl_timeleft(data, NULL, TRUE);
|
---|
| 931 |
|
---|
| 932 | if(timeout_ms < 0) {
|
---|
| 933 | /* no need to continue if time already is up */
|
---|
| 934 | failf(data, "SSL/TLS connection timeout");
|
---|
| 935 | return CURLE_OPERATION_TIMEDOUT;
|
---|
| 936 | }
|
---|
| 937 |
|
---|
| 938 | result = schannel_connect_step1(conn, sockindex);
|
---|
| 939 | if(result)
|
---|
| 940 | return result;
|
---|
| 941 | }
|
---|
| 942 |
|
---|
| 943 | while(ssl_connect_2 == connssl->connecting_state ||
|
---|
| 944 | ssl_connect_2_reading == connssl->connecting_state ||
|
---|
| 945 | ssl_connect_2_writing == connssl->connecting_state) {
|
---|
| 946 |
|
---|
| 947 | /* check out how much more time we're allowed */
|
---|
| 948 | timeout_ms = Curl_timeleft(data, NULL, TRUE);
|
---|
| 949 |
|
---|
| 950 | if(timeout_ms < 0) {
|
---|
| 951 | /* no need to continue if time already is up */
|
---|
| 952 | failf(data, "SSL/TLS connection timeout");
|
---|
| 953 | return CURLE_OPERATION_TIMEDOUT;
|
---|
| 954 | }
|
---|
| 955 |
|
---|
| 956 | /* if ssl is expecting something, check if it's available. */
|
---|
| 957 | if(connssl->connecting_state == ssl_connect_2_reading
|
---|
| 958 | || connssl->connecting_state == ssl_connect_2_writing) {
|
---|
| 959 |
|
---|
| 960 | curl_socket_t writefd = ssl_connect_2_writing ==
|
---|
| 961 | connssl->connecting_state ? sockfd : CURL_SOCKET_BAD;
|
---|
| 962 | curl_socket_t readfd = ssl_connect_2_reading ==
|
---|
| 963 | connssl->connecting_state ? sockfd : CURL_SOCKET_BAD;
|
---|
| 964 |
|
---|
| 965 | what = Curl_socket_check(readfd, CURL_SOCKET_BAD, writefd,
|
---|
| 966 | nonblocking ? 0 : timeout_ms);
|
---|
| 967 | if(what < 0) {
|
---|
| 968 | /* fatal error */
|
---|
| 969 | failf(data, "select/poll on SSL/TLS socket, errno: %d", SOCKERRNO);
|
---|
| 970 | return CURLE_SSL_CONNECT_ERROR;
|
---|
| 971 | }
|
---|
| 972 | else if(0 == what) {
|
---|
| 973 | if(nonblocking) {
|
---|
| 974 | *done = FALSE;
|
---|
| 975 | return CURLE_OK;
|
---|
| 976 | }
|
---|
| 977 | else {
|
---|
| 978 | /* timeout */
|
---|
| 979 | failf(data, "SSL/TLS connection timeout");
|
---|
| 980 | return CURLE_OPERATION_TIMEDOUT;
|
---|
| 981 | }
|
---|
| 982 | }
|
---|
| 983 | /* socket is readable or writable */
|
---|
| 984 | }
|
---|
| 985 |
|
---|
| 986 | /* Run transaction, and return to the caller if it failed or if
|
---|
| 987 | * this connection is part of a multi handle and this loop would
|
---|
| 988 | * execute again. This permits the owner of a multi handle to
|
---|
| 989 | * abort a connection attempt before step2 has completed while
|
---|
| 990 | * ensuring that a client using select() or epoll() will always
|
---|
| 991 | * have a valid fdset to wait on.
|
---|
| 992 | */
|
---|
| 993 | result = schannel_connect_step2(conn, sockindex);
|
---|
| 994 | if(result || (nonblocking &&
|
---|
| 995 | (ssl_connect_2 == connssl->connecting_state ||
|
---|
| 996 | ssl_connect_2_reading == connssl->connecting_state ||
|
---|
| 997 | ssl_connect_2_writing == connssl->connecting_state)))
|
---|
| 998 | return result;
|
---|
| 999 |
|
---|
| 1000 | } /* repeat step2 until all transactions are done. */
|
---|
| 1001 |
|
---|
| 1002 | if(ssl_connect_3 == connssl->connecting_state) {
|
---|
| 1003 | result = schannel_connect_step3(conn, sockindex);
|
---|
| 1004 | if(result)
|
---|
| 1005 | return result;
|
---|
| 1006 | }
|
---|
| 1007 |
|
---|
| 1008 | if(ssl_connect_done == connssl->connecting_state) {
|
---|
| 1009 | connssl->state = ssl_connection_complete;
|
---|
| 1010 | conn->recv[sockindex] = schannel_recv;
|
---|
| 1011 | conn->send[sockindex] = schannel_send;
|
---|
| 1012 | *done = TRUE;
|
---|
| 1013 | }
|
---|
| 1014 | else
|
---|
| 1015 | *done = FALSE;
|
---|
| 1016 |
|
---|
| 1017 | /* reset our connection state machine */
|
---|
| 1018 | connssl->connecting_state = ssl_connect_1;
|
---|
| 1019 |
|
---|
| 1020 | return CURLE_OK;
|
---|
| 1021 | }
|
---|
| 1022 |
|
---|
| 1023 | static ssize_t
|
---|
| 1024 | schannel_send(struct connectdata *conn, int sockindex,
|
---|
| 1025 | const void *buf, size_t len, CURLcode *err)
|
---|
| 1026 | {
|
---|
| 1027 | ssize_t written = -1;
|
---|
| 1028 | size_t data_len = 0;
|
---|
| 1029 | unsigned char *data = NULL;
|
---|
| 1030 | struct ssl_connect_data *connssl = &conn->ssl[sockindex];
|
---|
| 1031 | SecBuffer outbuf[4];
|
---|
| 1032 | SecBufferDesc outbuf_desc;
|
---|
| 1033 | SECURITY_STATUS sspi_status = SEC_E_OK;
|
---|
| 1034 | CURLcode result;
|
---|
| 1035 |
|
---|
| 1036 | /* check if the maximum stream sizes were queried */
|
---|
| 1037 | if(BACKEND->stream_sizes.cbMaximumMessage == 0) {
|
---|
| 1038 | sspi_status = s_pSecFn->QueryContextAttributes(
|
---|
| 1039 | &BACKEND->ctxt->ctxt_handle,
|
---|
| 1040 | SECPKG_ATTR_STREAM_SIZES,
|
---|
| 1041 | &BACKEND->stream_sizes);
|
---|
| 1042 | if(sspi_status != SEC_E_OK) {
|
---|
| 1043 | *err = CURLE_SEND_ERROR;
|
---|
| 1044 | return -1;
|
---|
| 1045 | }
|
---|
| 1046 | }
|
---|
| 1047 |
|
---|
| 1048 | /* check if the buffer is longer than the maximum message length */
|
---|
| 1049 | if(len > BACKEND->stream_sizes.cbMaximumMessage) {
|
---|
| 1050 | len = BACKEND->stream_sizes.cbMaximumMessage;
|
---|
| 1051 | }
|
---|
| 1052 |
|
---|
| 1053 | /* calculate the complete message length and allocate a buffer for it */
|
---|
| 1054 | data_len = BACKEND->stream_sizes.cbHeader + len +
|
---|
| 1055 | BACKEND->stream_sizes.cbTrailer;
|
---|
| 1056 | data = (unsigned char *) malloc(data_len);
|
---|
| 1057 | if(data == NULL) {
|
---|
| 1058 | *err = CURLE_OUT_OF_MEMORY;
|
---|
| 1059 | return -1;
|
---|
| 1060 | }
|
---|
| 1061 |
|
---|
| 1062 | /* setup output buffers (header, data, trailer, empty) */
|
---|
| 1063 | InitSecBuffer(&outbuf[0], SECBUFFER_STREAM_HEADER,
|
---|
| 1064 | data, BACKEND->stream_sizes.cbHeader);
|
---|
| 1065 | InitSecBuffer(&outbuf[1], SECBUFFER_DATA,
|
---|
| 1066 | data + BACKEND->stream_sizes.cbHeader, curlx_uztoul(len));
|
---|
| 1067 | InitSecBuffer(&outbuf[2], SECBUFFER_STREAM_TRAILER,
|
---|
| 1068 | data + BACKEND->stream_sizes.cbHeader + len,
|
---|
| 1069 | BACKEND->stream_sizes.cbTrailer);
|
---|
| 1070 | InitSecBuffer(&outbuf[3], SECBUFFER_EMPTY, NULL, 0);
|
---|
| 1071 | InitSecBufferDesc(&outbuf_desc, outbuf, 4);
|
---|
| 1072 |
|
---|
| 1073 | /* copy data into output buffer */
|
---|
| 1074 | memcpy(outbuf[1].pvBuffer, buf, len);
|
---|
| 1075 |
|
---|
| 1076 | /* https://msdn.microsoft.com/en-us/library/windows/desktop/aa375390.aspx */
|
---|
| 1077 | sspi_status = s_pSecFn->EncryptMessage(&BACKEND->ctxt->ctxt_handle, 0,
|
---|
| 1078 | &outbuf_desc, 0);
|
---|
| 1079 |
|
---|
| 1080 | /* check if the message was encrypted */
|
---|
| 1081 | if(sspi_status == SEC_E_OK) {
|
---|
| 1082 | written = 0;
|
---|
| 1083 |
|
---|
| 1084 | /* send the encrypted message including header, data and trailer */
|
---|
| 1085 | len = outbuf[0].cbBuffer + outbuf[1].cbBuffer + outbuf[2].cbBuffer;
|
---|
| 1086 |
|
---|
| 1087 | /*
|
---|
| 1088 | It's important to send the full message which includes the header,
|
---|
| 1089 | encrypted payload, and trailer. Until the client receives all the
|
---|
| 1090 | data a coherent message has not been delivered and the client
|
---|
| 1091 | can't read any of it.
|
---|
| 1092 |
|
---|
| 1093 | If we wanted to buffer the unwritten encrypted bytes, we would
|
---|
| 1094 | tell the client that all data it has requested to be sent has been
|
---|
| 1095 | sent. The unwritten encrypted bytes would be the first bytes to
|
---|
| 1096 | send on the next invocation.
|
---|
| 1097 | Here's the catch with this - if we tell the client that all the
|
---|
| 1098 | bytes have been sent, will the client call this method again to
|
---|
| 1099 | send the buffered data? Looking at who calls this function, it
|
---|
| 1100 | seems the answer is NO.
|
---|
| 1101 | */
|
---|
| 1102 |
|
---|
| 1103 | /* send entire message or fail */
|
---|
| 1104 | while(len > (size_t)written) {
|
---|
| 1105 | ssize_t this_write;
|
---|
| 1106 | time_t timeleft;
|
---|
| 1107 | int what;
|
---|
| 1108 |
|
---|
| 1109 | this_write = 0;
|
---|
| 1110 |
|
---|
| 1111 | timeleft = Curl_timeleft(conn->data, NULL, FALSE);
|
---|
| 1112 | if(timeleft < 0) {
|
---|
| 1113 | /* we already got the timeout */
|
---|
| 1114 | failf(conn->data, "schannel: timed out sending data "
|
---|
| 1115 | "(bytes sent: %zd)", written);
|
---|
| 1116 | *err = CURLE_OPERATION_TIMEDOUT;
|
---|
| 1117 | written = -1;
|
---|
| 1118 | break;
|
---|
| 1119 | }
|
---|
| 1120 |
|
---|
| 1121 | what = SOCKET_WRITABLE(conn->sock[sockindex], timeleft);
|
---|
| 1122 | if(what < 0) {
|
---|
| 1123 | /* fatal error */
|
---|
| 1124 | failf(conn->data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
|
---|
| 1125 | *err = CURLE_SEND_ERROR;
|
---|
| 1126 | written = -1;
|
---|
| 1127 | break;
|
---|
| 1128 | }
|
---|
| 1129 | else if(0 == what) {
|
---|
| 1130 | failf(conn->data, "schannel: timed out sending data "
|
---|
| 1131 | "(bytes sent: %zd)", written);
|
---|
| 1132 | *err = CURLE_OPERATION_TIMEDOUT;
|
---|
| 1133 | written = -1;
|
---|
| 1134 | break;
|
---|
| 1135 | }
|
---|
| 1136 | /* socket is writable */
|
---|
| 1137 |
|
---|
| 1138 | result = Curl_write_plain(conn, conn->sock[sockindex], data + written,
|
---|
| 1139 | len - written, &this_write);
|
---|
| 1140 | if(result == CURLE_AGAIN)
|
---|
| 1141 | continue;
|
---|
| 1142 | else if(result != CURLE_OK) {
|
---|
| 1143 | *err = result;
|
---|
| 1144 | written = -1;
|
---|
| 1145 | break;
|
---|
| 1146 | }
|
---|
| 1147 |
|
---|
| 1148 | written += this_write;
|
---|
| 1149 | }
|
---|
| 1150 | }
|
---|
| 1151 | else if(sspi_status == SEC_E_INSUFFICIENT_MEMORY) {
|
---|
| 1152 | *err = CURLE_OUT_OF_MEMORY;
|
---|
| 1153 | }
|
---|
| 1154 | else{
|
---|
| 1155 | *err = CURLE_SEND_ERROR;
|
---|
| 1156 | }
|
---|
| 1157 |
|
---|
| 1158 | Curl_safefree(data);
|
---|
| 1159 |
|
---|
| 1160 | if(len == (size_t)written)
|
---|
| 1161 | /* Encrypted message including header, data and trailer entirely sent.
|
---|
| 1162 | The return value is the number of unencrypted bytes that were sent. */
|
---|
| 1163 | written = outbuf[1].cbBuffer;
|
---|
| 1164 |
|
---|
| 1165 | return written;
|
---|
| 1166 | }
|
---|
| 1167 |
|
---|
| 1168 | static ssize_t
|
---|
| 1169 | schannel_recv(struct connectdata *conn, int sockindex,
|
---|
| 1170 | char *buf, size_t len, CURLcode *err)
|
---|
| 1171 | {
|
---|
| 1172 | size_t size = 0;
|
---|
| 1173 | ssize_t nread = -1;
|
---|
| 1174 | struct Curl_easy *data = conn->data;
|
---|
| 1175 | struct ssl_connect_data *connssl = &conn->ssl[sockindex];
|
---|
| 1176 | unsigned char *reallocated_buffer;
|
---|
| 1177 | size_t reallocated_length;
|
---|
| 1178 | bool done = FALSE;
|
---|
| 1179 | SecBuffer inbuf[4];
|
---|
| 1180 | SecBufferDesc inbuf_desc;
|
---|
| 1181 | SECURITY_STATUS sspi_status = SEC_E_OK;
|
---|
| 1182 | /* we want the length of the encrypted buffer to be at least large enough
|
---|
| 1183 | that it can hold all the bytes requested and some TLS record overhead. */
|
---|
| 1184 | size_t min_encdata_length = len + CURL_SCHANNEL_BUFFER_FREE_SIZE;
|
---|
| 1185 |
|
---|
| 1186 | /****************************************************************************
|
---|
| 1187 | * Don't return or set BACKEND->recv_unrecoverable_err unless in the cleanup.
|
---|
| 1188 | * The pattern for return error is set *err, optional infof, goto cleanup.
|
---|
| 1189 | *
|
---|
| 1190 | * Our priority is to always return as much decrypted data to the caller as
|
---|
| 1191 | * possible, even if an error occurs. The state of the decrypted buffer must
|
---|
| 1192 | * always be valid. Transfer of decrypted data to the caller's buffer is
|
---|
| 1193 | * handled in the cleanup.
|
---|
| 1194 | */
|
---|
| 1195 |
|
---|
| 1196 | infof(data, "schannel: client wants to read %zu bytes\n", len);
|
---|
| 1197 | *err = CURLE_OK;
|
---|
| 1198 |
|
---|
| 1199 | if(len && len <= BACKEND->decdata_offset) {
|
---|
| 1200 | infof(data, "schannel: enough decrypted data is already available\n");
|
---|
| 1201 | goto cleanup;
|
---|
| 1202 | }
|
---|
| 1203 | else if(BACKEND->recv_unrecoverable_err) {
|
---|
| 1204 | *err = BACKEND->recv_unrecoverable_err;
|
---|
| 1205 | infof(data, "schannel: an unrecoverable error occurred in a prior call\n");
|
---|
| 1206 | goto cleanup;
|
---|
| 1207 | }
|
---|
| 1208 | else if(BACKEND->recv_sspi_close_notify) {
|
---|
| 1209 | /* once a server has indicated shutdown there is no more encrypted data */
|
---|
| 1210 | infof(data, "schannel: server indicated shutdown in a prior call\n");
|
---|
| 1211 | goto cleanup;
|
---|
| 1212 | }
|
---|
| 1213 | else if(!len) {
|
---|
| 1214 | /* It's debatable what to return when !len. Regardless we can't return
|
---|
| 1215 | immediately because there may be data to decrypt (in the case we want to
|
---|
| 1216 | decrypt all encrypted cached data) so handle !len later in cleanup.
|
---|
| 1217 | */
|
---|
| 1218 | ; /* do nothing */
|
---|
| 1219 | }
|
---|
| 1220 | else if(!BACKEND->recv_connection_closed) {
|
---|
| 1221 | /* increase enc buffer in order to fit the requested amount of data */
|
---|
| 1222 | size = BACKEND->encdata_length - BACKEND->encdata_offset;
|
---|
| 1223 | if(size < CURL_SCHANNEL_BUFFER_FREE_SIZE ||
|
---|
| 1224 | BACKEND->encdata_length < min_encdata_length) {
|
---|
| 1225 | reallocated_length = BACKEND->encdata_offset +
|
---|
| 1226 | CURL_SCHANNEL_BUFFER_FREE_SIZE;
|
---|
| 1227 | if(reallocated_length < min_encdata_length) {
|
---|
| 1228 | reallocated_length = min_encdata_length;
|
---|
| 1229 | }
|
---|
| 1230 | reallocated_buffer = realloc(BACKEND->encdata_buffer,
|
---|
| 1231 | reallocated_length);
|
---|
| 1232 | if(reallocated_buffer == NULL) {
|
---|
| 1233 | *err = CURLE_OUT_OF_MEMORY;
|
---|
| 1234 | failf(data, "schannel: unable to re-allocate memory");
|
---|
| 1235 | goto cleanup;
|
---|
| 1236 | }
|
---|
| 1237 |
|
---|
| 1238 | BACKEND->encdata_buffer = reallocated_buffer;
|
---|
| 1239 | BACKEND->encdata_length = reallocated_length;
|
---|
| 1240 | size = BACKEND->encdata_length - BACKEND->encdata_offset;
|
---|
| 1241 | infof(data, "schannel: encdata_buffer resized %zu\n",
|
---|
| 1242 | BACKEND->encdata_length);
|
---|
| 1243 | }
|
---|
| 1244 |
|
---|
| 1245 | infof(data, "schannel: encrypted data buffer: offset %zu length %zu\n",
|
---|
| 1246 | BACKEND->encdata_offset, BACKEND->encdata_length);
|
---|
| 1247 |
|
---|
| 1248 | /* read encrypted data from socket */
|
---|
| 1249 | *err = Curl_read_plain(conn->sock[sockindex],
|
---|
| 1250 | (char *)(BACKEND->encdata_buffer +
|
---|
| 1251 | BACKEND->encdata_offset),
|
---|
| 1252 | size, &nread);
|
---|
| 1253 | if(*err) {
|
---|
| 1254 | nread = -1;
|
---|
| 1255 | if(*err == CURLE_AGAIN)
|
---|
| 1256 | infof(data, "schannel: Curl_read_plain returned CURLE_AGAIN\n");
|
---|
| 1257 | else if(*err == CURLE_RECV_ERROR)
|
---|
| 1258 | infof(data, "schannel: Curl_read_plain returned CURLE_RECV_ERROR\n");
|
---|
| 1259 | else
|
---|
| 1260 | infof(data, "schannel: Curl_read_plain returned error %d\n", *err);
|
---|
| 1261 | }
|
---|
| 1262 | else if(nread == 0) {
|
---|
| 1263 | BACKEND->recv_connection_closed = true;
|
---|
| 1264 | infof(data, "schannel: server closed the connection\n");
|
---|
| 1265 | }
|
---|
| 1266 | else if(nread > 0) {
|
---|
| 1267 | BACKEND->encdata_offset += (size_t)nread;
|
---|
| 1268 | BACKEND->encdata_is_incomplete = false;
|
---|
| 1269 | infof(data, "schannel: encrypted data got %zd\n", nread);
|
---|
| 1270 | }
|
---|
| 1271 | }
|
---|
| 1272 |
|
---|
| 1273 | infof(data, "schannel: encrypted data buffer: offset %zu length %zu\n",
|
---|
| 1274 | BACKEND->encdata_offset, BACKEND->encdata_length);
|
---|
| 1275 |
|
---|
| 1276 | /* decrypt loop */
|
---|
| 1277 | while(BACKEND->encdata_offset > 0 && sspi_status == SEC_E_OK &&
|
---|
| 1278 | (!len || BACKEND->decdata_offset < len ||
|
---|
| 1279 | BACKEND->recv_connection_closed)) {
|
---|
| 1280 | /* prepare data buffer for DecryptMessage call */
|
---|
| 1281 | InitSecBuffer(&inbuf[0], SECBUFFER_DATA, BACKEND->encdata_buffer,
|
---|
| 1282 | curlx_uztoul(BACKEND->encdata_offset));
|
---|
| 1283 |
|
---|
| 1284 | /* we need 3 more empty input buffers for possible output */
|
---|
| 1285 | InitSecBuffer(&inbuf[1], SECBUFFER_EMPTY, NULL, 0);
|
---|
| 1286 | InitSecBuffer(&inbuf[2], SECBUFFER_EMPTY, NULL, 0);
|
---|
| 1287 | InitSecBuffer(&inbuf[3], SECBUFFER_EMPTY, NULL, 0);
|
---|
| 1288 | InitSecBufferDesc(&inbuf_desc, inbuf, 4);
|
---|
| 1289 |
|
---|
| 1290 | /* https://msdn.microsoft.com/en-us/library/windows/desktop/aa375348.aspx
|
---|
| 1291 | */
|
---|
| 1292 | sspi_status = s_pSecFn->DecryptMessage(&BACKEND->ctxt->ctxt_handle,
|
---|
| 1293 | &inbuf_desc, 0, NULL);
|
---|
| 1294 |
|
---|
| 1295 | /* check if everything went fine (server may want to renegotiate
|
---|
| 1296 | or shutdown the connection context) */
|
---|
| 1297 | if(sspi_status == SEC_E_OK || sspi_status == SEC_I_RENEGOTIATE ||
|
---|
| 1298 | sspi_status == SEC_I_CONTEXT_EXPIRED) {
|
---|
| 1299 | /* check for successfully decrypted data, even before actual
|
---|
| 1300 | renegotiation or shutdown of the connection context */
|
---|
| 1301 | if(inbuf[1].BufferType == SECBUFFER_DATA) {
|
---|
| 1302 | infof(data, "schannel: decrypted data length: %lu\n",
|
---|
| 1303 | inbuf[1].cbBuffer);
|
---|
| 1304 |
|
---|
| 1305 | /* increase buffer in order to fit the received amount of data */
|
---|
| 1306 | size = inbuf[1].cbBuffer > CURL_SCHANNEL_BUFFER_FREE_SIZE ?
|
---|
| 1307 | inbuf[1].cbBuffer : CURL_SCHANNEL_BUFFER_FREE_SIZE;
|
---|
| 1308 | if(BACKEND->decdata_length - BACKEND->decdata_offset < size ||
|
---|
| 1309 | BACKEND->decdata_length < len) {
|
---|
| 1310 | /* increase internal decrypted data buffer */
|
---|
| 1311 | reallocated_length = BACKEND->decdata_offset + size;
|
---|
| 1312 | /* make sure that the requested amount of data fits */
|
---|
| 1313 | if(reallocated_length < len) {
|
---|
| 1314 | reallocated_length = len;
|
---|
| 1315 | }
|
---|
| 1316 | reallocated_buffer = realloc(BACKEND->decdata_buffer,
|
---|
| 1317 | reallocated_length);
|
---|
| 1318 | if(reallocated_buffer == NULL) {
|
---|
| 1319 | *err = CURLE_OUT_OF_MEMORY;
|
---|
| 1320 | failf(data, "schannel: unable to re-allocate memory");
|
---|
| 1321 | goto cleanup;
|
---|
| 1322 | }
|
---|
| 1323 | BACKEND->decdata_buffer = reallocated_buffer;
|
---|
| 1324 | BACKEND->decdata_length = reallocated_length;
|
---|
| 1325 | }
|
---|
| 1326 |
|
---|
| 1327 | /* copy decrypted data to internal buffer */
|
---|
| 1328 | size = inbuf[1].cbBuffer;
|
---|
| 1329 | if(size) {
|
---|
| 1330 | memcpy(BACKEND->decdata_buffer + BACKEND->decdata_offset,
|
---|
| 1331 | inbuf[1].pvBuffer, size);
|
---|
| 1332 | BACKEND->decdata_offset += size;
|
---|
| 1333 | }
|
---|
| 1334 |
|
---|
| 1335 | infof(data, "schannel: decrypted data added: %zu\n", size);
|
---|
| 1336 | infof(data, "schannel: decrypted data cached: offset %zu length %zu\n",
|
---|
| 1337 | BACKEND->decdata_offset, BACKEND->decdata_length);
|
---|
| 1338 | }
|
---|
| 1339 |
|
---|
| 1340 | /* check for remaining encrypted data */
|
---|
| 1341 | if(inbuf[3].BufferType == SECBUFFER_EXTRA && inbuf[3].cbBuffer > 0) {
|
---|
| 1342 | infof(data, "schannel: encrypted data length: %lu\n",
|
---|
| 1343 | inbuf[3].cbBuffer);
|
---|
| 1344 |
|
---|
| 1345 | /* check if the remaining data is less than the total amount
|
---|
| 1346 | * and therefore begins after the already processed data
|
---|
| 1347 | */
|
---|
| 1348 | if(BACKEND->encdata_offset > inbuf[3].cbBuffer) {
|
---|
| 1349 | /* move remaining encrypted data forward to the beginning of
|
---|
| 1350 | buffer */
|
---|
| 1351 | memmove(BACKEND->encdata_buffer,
|
---|
| 1352 | (BACKEND->encdata_buffer + BACKEND->encdata_offset) -
|
---|
| 1353 | inbuf[3].cbBuffer, inbuf[3].cbBuffer);
|
---|
| 1354 | BACKEND->encdata_offset = inbuf[3].cbBuffer;
|
---|
| 1355 | }
|
---|
| 1356 |
|
---|
| 1357 | infof(data, "schannel: encrypted data cached: offset %zu length %zu\n",
|
---|
| 1358 | BACKEND->encdata_offset, BACKEND->encdata_length);
|
---|
| 1359 | }
|
---|
| 1360 | else {
|
---|
| 1361 | /* reset encrypted buffer offset, because there is no data remaining */
|
---|
| 1362 | BACKEND->encdata_offset = 0;
|
---|
| 1363 | }
|
---|
| 1364 |
|
---|
| 1365 | /* check if server wants to renegotiate the connection context */
|
---|
| 1366 | if(sspi_status == SEC_I_RENEGOTIATE) {
|
---|
| 1367 | infof(data, "schannel: remote party requests renegotiation\n");
|
---|
| 1368 | if(*err && *err != CURLE_AGAIN) {
|
---|
| 1369 | infof(data, "schannel: can't renogotiate, an error is pending\n");
|
---|
| 1370 | goto cleanup;
|
---|
| 1371 | }
|
---|
| 1372 | if(BACKEND->encdata_offset) {
|
---|
| 1373 | *err = CURLE_RECV_ERROR;
|
---|
| 1374 | infof(data, "schannel: can't renogotiate, "
|
---|
| 1375 | "encrypted data available\n");
|
---|
| 1376 | goto cleanup;
|
---|
| 1377 | }
|
---|
| 1378 | /* begin renegotiation */
|
---|
| 1379 | infof(data, "schannel: renegotiating SSL/TLS connection\n");
|
---|
| 1380 | connssl->state = ssl_connection_negotiating;
|
---|
| 1381 | connssl->connecting_state = ssl_connect_2_writing;
|
---|
| 1382 | *err = schannel_connect_common(conn, sockindex, FALSE, &done);
|
---|
| 1383 | if(*err) {
|
---|
| 1384 | infof(data, "schannel: renegotiation failed\n");
|
---|
| 1385 | goto cleanup;
|
---|
| 1386 | }
|
---|
| 1387 | /* now retry receiving data */
|
---|
| 1388 | sspi_status = SEC_E_OK;
|
---|
| 1389 | infof(data, "schannel: SSL/TLS connection renegotiated\n");
|
---|
| 1390 | continue;
|
---|
| 1391 | }
|
---|
| 1392 | /* check if the server closed the connection */
|
---|
| 1393 | else if(sspi_status == SEC_I_CONTEXT_EXPIRED) {
|
---|
| 1394 | /* In Windows 2000 SEC_I_CONTEXT_EXPIRED (close_notify) is not
|
---|
| 1395 | returned so we have to work around that in cleanup. */
|
---|
| 1396 | BACKEND->recv_sspi_close_notify = true;
|
---|
| 1397 | if(!BACKEND->recv_connection_closed) {
|
---|
| 1398 | BACKEND->recv_connection_closed = true;
|
---|
| 1399 | infof(data, "schannel: server closed the connection\n");
|
---|
| 1400 | }
|
---|
| 1401 | goto cleanup;
|
---|
| 1402 | }
|
---|
| 1403 | }
|
---|
| 1404 | else if(sspi_status == SEC_E_INCOMPLETE_MESSAGE) {
|
---|
| 1405 | BACKEND->encdata_is_incomplete = true;
|
---|
| 1406 | if(!*err)
|
---|
| 1407 | *err = CURLE_AGAIN;
|
---|
| 1408 | infof(data, "schannel: failed to decrypt data, need more data\n");
|
---|
| 1409 | goto cleanup;
|
---|
| 1410 | }
|
---|
| 1411 | else {
|
---|
| 1412 | *err = CURLE_RECV_ERROR;
|
---|
| 1413 | infof(data, "schannel: failed to read data from server: %s\n",
|
---|
| 1414 | Curl_sspi_strerror(conn, sspi_status));
|
---|
| 1415 | goto cleanup;
|
---|
| 1416 | }
|
---|
| 1417 | }
|
---|
| 1418 |
|
---|
| 1419 | infof(data, "schannel: encrypted data buffer: offset %zu length %zu\n",
|
---|
| 1420 | BACKEND->encdata_offset, BACKEND->encdata_length);
|
---|
| 1421 |
|
---|
| 1422 | infof(data, "schannel: decrypted data buffer: offset %zu length %zu\n",
|
---|
| 1423 | BACKEND->decdata_offset, BACKEND->decdata_length);
|
---|
| 1424 |
|
---|
| 1425 | cleanup:
|
---|
| 1426 | /* Warning- there is no guarantee the encdata state is valid at this point */
|
---|
| 1427 | infof(data, "schannel: schannel_recv cleanup\n");
|
---|
| 1428 |
|
---|
| 1429 | /* Error if the connection has closed without a close_notify.
|
---|
| 1430 | Behavior here is a matter of debate. We don't want to be vulnerable to a
|
---|
| 1431 | truncation attack however there's some browser precedent for ignoring the
|
---|
| 1432 | close_notify for compatibility reasons.
|
---|
| 1433 | Additionally, Windows 2000 (v5.0) is a special case since it seems it doesn't
|
---|
| 1434 | return close_notify. In that case if the connection was closed we assume it
|
---|
| 1435 | was graceful (close_notify) since there doesn't seem to be a way to tell.
|
---|
| 1436 | */
|
---|
| 1437 | if(len && !BACKEND->decdata_offset && BACKEND->recv_connection_closed &&
|
---|
| 1438 | !BACKEND->recv_sspi_close_notify) {
|
---|
| 1439 | bool isWin2k = Curl_verify_windows_version(5, 0, PLATFORM_WINNT,
|
---|
| 1440 | VERSION_EQUAL);
|
---|
| 1441 |
|
---|
| 1442 | if(isWin2k && sspi_status == SEC_E_OK)
|
---|
| 1443 | BACKEND->recv_sspi_close_notify = true;
|
---|
| 1444 | else {
|
---|
| 1445 | *err = CURLE_RECV_ERROR;
|
---|
| 1446 | infof(data, "schannel: server closed abruptly (missing close_notify)\n");
|
---|
| 1447 | }
|
---|
| 1448 | }
|
---|
| 1449 |
|
---|
| 1450 | /* Any error other than CURLE_AGAIN is an unrecoverable error. */
|
---|
| 1451 | if(*err && *err != CURLE_AGAIN)
|
---|
| 1452 | BACKEND->recv_unrecoverable_err = *err;
|
---|
| 1453 |
|
---|
| 1454 | size = len < BACKEND->decdata_offset ? len : BACKEND->decdata_offset;
|
---|
| 1455 | if(size) {
|
---|
| 1456 | memcpy(buf, BACKEND->decdata_buffer, size);
|
---|
| 1457 | memmove(BACKEND->decdata_buffer, BACKEND->decdata_buffer + size,
|
---|
| 1458 | BACKEND->decdata_offset - size);
|
---|
| 1459 | BACKEND->decdata_offset -= size;
|
---|
| 1460 |
|
---|
| 1461 | infof(data, "schannel: decrypted data returned %zu\n", size);
|
---|
| 1462 | infof(data, "schannel: decrypted data buffer: offset %zu length %zu\n",
|
---|
| 1463 | BACKEND->decdata_offset, BACKEND->decdata_length);
|
---|
| 1464 | *err = CURLE_OK;
|
---|
| 1465 | return (ssize_t)size;
|
---|
| 1466 | }
|
---|
| 1467 |
|
---|
| 1468 | if(!*err && !BACKEND->recv_connection_closed)
|
---|
| 1469 | *err = CURLE_AGAIN;
|
---|
| 1470 |
|
---|
| 1471 | /* It's debatable what to return when !len. We could return whatever error we
|
---|
| 1472 | got from decryption but instead we override here so the return is consistent.
|
---|
| 1473 | */
|
---|
| 1474 | if(!len)
|
---|
| 1475 | *err = CURLE_OK;
|
---|
| 1476 |
|
---|
| 1477 | return *err ? -1 : 0;
|
---|
| 1478 | }
|
---|
| 1479 |
|
---|
| 1480 | static CURLcode Curl_schannel_connect_nonblocking(struct connectdata *conn,
|
---|
| 1481 | int sockindex, bool *done)
|
---|
| 1482 | {
|
---|
| 1483 | return schannel_connect_common(conn, sockindex, TRUE, done);
|
---|
| 1484 | }
|
---|
| 1485 |
|
---|
| 1486 | static CURLcode Curl_schannel_connect(struct connectdata *conn, int sockindex)
|
---|
| 1487 | {
|
---|
| 1488 | CURLcode result;
|
---|
| 1489 | bool done = FALSE;
|
---|
| 1490 |
|
---|
| 1491 | result = schannel_connect_common(conn, sockindex, FALSE, &done);
|
---|
| 1492 | if(result)
|
---|
| 1493 | return result;
|
---|
| 1494 |
|
---|
| 1495 | DEBUGASSERT(done);
|
---|
| 1496 |
|
---|
| 1497 | return CURLE_OK;
|
---|
| 1498 | }
|
---|
| 1499 |
|
---|
| 1500 | static bool Curl_schannel_data_pending(const struct connectdata *conn,
|
---|
| 1501 | int sockindex)
|
---|
| 1502 | {
|
---|
| 1503 | const struct ssl_connect_data *connssl = &conn->ssl[sockindex];
|
---|
| 1504 |
|
---|
| 1505 | if(connssl->use) /* SSL/TLS is in use */
|
---|
| 1506 | return (BACKEND->decdata_offset > 0 ||
|
---|
| 1507 | (BACKEND->encdata_offset > 0 && !BACKEND->encdata_is_incomplete));
|
---|
| 1508 | else
|
---|
| 1509 | return FALSE;
|
---|
| 1510 | }
|
---|
| 1511 |
|
---|
| 1512 | static void Curl_schannel_close(struct connectdata *conn, int sockindex)
|
---|
| 1513 | {
|
---|
| 1514 | if(conn->ssl[sockindex].use)
|
---|
| 1515 | /* if the SSL/TLS channel hasn't been shut down yet, do that now. */
|
---|
| 1516 | Curl_ssl_shutdown(conn, sockindex);
|
---|
| 1517 | }
|
---|
| 1518 |
|
---|
| 1519 | static void Curl_schannel_session_free(void *ptr)
|
---|
| 1520 | {
|
---|
| 1521 | /* this is expected to be called under sessionid lock */
|
---|
| 1522 | struct curl_schannel_cred *cred = ptr;
|
---|
| 1523 |
|
---|
| 1524 | cred->refcount--;
|
---|
| 1525 | if(cred->refcount == 0) {
|
---|
| 1526 | s_pSecFn->FreeCredentialsHandle(&cred->cred_handle);
|
---|
| 1527 | Curl_safefree(cred);
|
---|
| 1528 | }
|
---|
| 1529 | }
|
---|
| 1530 |
|
---|
| 1531 | static int Curl_schannel_shutdown(struct connectdata *conn, int sockindex)
|
---|
| 1532 | {
|
---|
| 1533 | /* See https://msdn.microsoft.com/en-us/library/windows/desktop/aa380138.aspx
|
---|
| 1534 | * Shutting Down an Schannel Connection
|
---|
| 1535 | */
|
---|
| 1536 | struct Curl_easy *data = conn->data;
|
---|
| 1537 | struct ssl_connect_data *connssl = &conn->ssl[sockindex];
|
---|
| 1538 | char * const hostname = SSL_IS_PROXY() ? conn->http_proxy.host.name :
|
---|
| 1539 | conn->host.name;
|
---|
| 1540 |
|
---|
| 1541 | infof(data, "schannel: shutting down SSL/TLS connection with %s port %hu\n",
|
---|
| 1542 | hostname, conn->remote_port);
|
---|
| 1543 |
|
---|
| 1544 | if(BACKEND->cred && BACKEND->ctxt) {
|
---|
| 1545 | SecBufferDesc BuffDesc;
|
---|
| 1546 | SecBuffer Buffer;
|
---|
| 1547 | SECURITY_STATUS sspi_status;
|
---|
| 1548 | SecBuffer outbuf;
|
---|
| 1549 | SecBufferDesc outbuf_desc;
|
---|
| 1550 | CURLcode result;
|
---|
| 1551 | TCHAR *host_name;
|
---|
| 1552 | DWORD dwshut = SCHANNEL_SHUTDOWN;
|
---|
| 1553 |
|
---|
| 1554 | InitSecBuffer(&Buffer, SECBUFFER_TOKEN, &dwshut, sizeof(dwshut));
|
---|
| 1555 | InitSecBufferDesc(&BuffDesc, &Buffer, 1);
|
---|
| 1556 |
|
---|
| 1557 | sspi_status = s_pSecFn->ApplyControlToken(&BACKEND->ctxt->ctxt_handle,
|
---|
| 1558 | &BuffDesc);
|
---|
| 1559 |
|
---|
| 1560 | if(sspi_status != SEC_E_OK)
|
---|
| 1561 | failf(data, "schannel: ApplyControlToken failure: %s",
|
---|
| 1562 | Curl_sspi_strerror(conn, sspi_status));
|
---|
| 1563 |
|
---|
| 1564 | host_name = Curl_convert_UTF8_to_tchar(hostname);
|
---|
| 1565 | if(!host_name)
|
---|
| 1566 | return CURLE_OUT_OF_MEMORY;
|
---|
| 1567 |
|
---|
| 1568 | /* setup output buffer */
|
---|
| 1569 | InitSecBuffer(&outbuf, SECBUFFER_EMPTY, NULL, 0);
|
---|
| 1570 | InitSecBufferDesc(&outbuf_desc, &outbuf, 1);
|
---|
| 1571 |
|
---|
| 1572 | sspi_status = s_pSecFn->InitializeSecurityContext(
|
---|
| 1573 | &BACKEND->cred->cred_handle,
|
---|
| 1574 | &BACKEND->ctxt->ctxt_handle,
|
---|
| 1575 | host_name,
|
---|
| 1576 | BACKEND->req_flags,
|
---|
| 1577 | 0,
|
---|
| 1578 | 0,
|
---|
| 1579 | NULL,
|
---|
| 1580 | 0,
|
---|
| 1581 | &BACKEND->ctxt->ctxt_handle,
|
---|
| 1582 | &outbuf_desc,
|
---|
| 1583 | &BACKEND->ret_flags,
|
---|
| 1584 | &BACKEND->ctxt->time_stamp);
|
---|
| 1585 |
|
---|
| 1586 | Curl_unicodefree(host_name);
|
---|
| 1587 |
|
---|
| 1588 | if((sspi_status == SEC_E_OK) || (sspi_status == SEC_I_CONTEXT_EXPIRED)) {
|
---|
| 1589 | /* send close message which is in output buffer */
|
---|
| 1590 | ssize_t written;
|
---|
| 1591 | result = Curl_write_plain(conn, conn->sock[sockindex], outbuf.pvBuffer,
|
---|
| 1592 | outbuf.cbBuffer, &written);
|
---|
| 1593 |
|
---|
| 1594 | s_pSecFn->FreeContextBuffer(outbuf.pvBuffer);
|
---|
| 1595 | if((result != CURLE_OK) || (outbuf.cbBuffer != (size_t) written)) {
|
---|
| 1596 | infof(data, "schannel: failed to send close msg: %s"
|
---|
| 1597 | " (bytes written: %zd)\n", curl_easy_strerror(result), written);
|
---|
| 1598 | }
|
---|
| 1599 | }
|
---|
| 1600 | }
|
---|
| 1601 |
|
---|
| 1602 | /* free SSPI Schannel API security context handle */
|
---|
| 1603 | if(BACKEND->ctxt) {
|
---|
| 1604 | infof(data, "schannel: clear security context handle\n");
|
---|
| 1605 | s_pSecFn->DeleteSecurityContext(&BACKEND->ctxt->ctxt_handle);
|
---|
| 1606 | Curl_safefree(BACKEND->ctxt);
|
---|
| 1607 | }
|
---|
| 1608 |
|
---|
| 1609 | /* free SSPI Schannel API credential handle */
|
---|
| 1610 | if(BACKEND->cred) {
|
---|
| 1611 | Curl_ssl_sessionid_lock(conn);
|
---|
| 1612 | Curl_schannel_session_free(BACKEND->cred);
|
---|
| 1613 | Curl_ssl_sessionid_unlock(conn);
|
---|
| 1614 | BACKEND->cred = NULL;
|
---|
| 1615 | }
|
---|
| 1616 |
|
---|
| 1617 | /* free internal buffer for received encrypted data */
|
---|
| 1618 | if(BACKEND->encdata_buffer != NULL) {
|
---|
| 1619 | Curl_safefree(BACKEND->encdata_buffer);
|
---|
| 1620 | BACKEND->encdata_length = 0;
|
---|
| 1621 | BACKEND->encdata_offset = 0;
|
---|
| 1622 | BACKEND->encdata_is_incomplete = false;
|
---|
| 1623 | }
|
---|
| 1624 |
|
---|
| 1625 | /* free internal buffer for received decrypted data */
|
---|
| 1626 | if(BACKEND->decdata_buffer != NULL) {
|
---|
| 1627 | Curl_safefree(BACKEND->decdata_buffer);
|
---|
| 1628 | BACKEND->decdata_length = 0;
|
---|
| 1629 | BACKEND->decdata_offset = 0;
|
---|
| 1630 | }
|
---|
| 1631 |
|
---|
| 1632 | return CURLE_OK;
|
---|
| 1633 | }
|
---|
| 1634 |
|
---|
| 1635 | static int Curl_schannel_init(void)
|
---|
| 1636 | {
|
---|
| 1637 | return (Curl_sspi_global_init() == CURLE_OK ? 1 : 0);
|
---|
| 1638 | }
|
---|
| 1639 |
|
---|
| 1640 | static void Curl_schannel_cleanup(void)
|
---|
| 1641 | {
|
---|
| 1642 | Curl_sspi_global_cleanup();
|
---|
| 1643 | }
|
---|
| 1644 |
|
---|
| 1645 | static size_t Curl_schannel_version(char *buffer, size_t size)
|
---|
| 1646 | {
|
---|
| 1647 | size = snprintf(buffer, size, "WinSSL");
|
---|
| 1648 |
|
---|
| 1649 | return size;
|
---|
| 1650 | }
|
---|
| 1651 |
|
---|
| 1652 | static CURLcode Curl_schannel_random(struct Curl_easy *data UNUSED_PARAM,
|
---|
| 1653 | unsigned char *entropy, size_t length)
|
---|
| 1654 | {
|
---|
| 1655 | HCRYPTPROV hCryptProv = 0;
|
---|
| 1656 |
|
---|
| 1657 | (void)data;
|
---|
| 1658 |
|
---|
| 1659 | if(!CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL,
|
---|
| 1660 | CRYPT_VERIFYCONTEXT | CRYPT_SILENT))
|
---|
| 1661 | return CURLE_FAILED_INIT;
|
---|
| 1662 |
|
---|
| 1663 | if(!CryptGenRandom(hCryptProv, (DWORD)length, entropy)) {
|
---|
| 1664 | CryptReleaseContext(hCryptProv, 0UL);
|
---|
| 1665 | return CURLE_FAILED_INIT;
|
---|
| 1666 | }
|
---|
| 1667 |
|
---|
| 1668 | CryptReleaseContext(hCryptProv, 0UL);
|
---|
| 1669 | return CURLE_OK;
|
---|
| 1670 | }
|
---|
| 1671 |
|
---|
| 1672 | #ifdef _WIN32_WCE
|
---|
| 1673 | static CURLcode verify_certificate(struct connectdata *conn, int sockindex)
|
---|
| 1674 | {
|
---|
| 1675 | SECURITY_STATUS status;
|
---|
| 1676 | struct Curl_easy *data = conn->data;
|
---|
| 1677 | struct ssl_connect_data *connssl = &conn->ssl[sockindex];
|
---|
| 1678 | CURLcode result = CURLE_OK;
|
---|
| 1679 | CERT_CONTEXT *pCertContextServer = NULL;
|
---|
| 1680 | const CERT_CHAIN_CONTEXT *pChainContext = NULL;
|
---|
| 1681 | const char * const conn_hostname = SSL_IS_PROXY() ?
|
---|
| 1682 | conn->http_proxy.host.name :
|
---|
| 1683 | conn->host.name;
|
---|
| 1684 |
|
---|
| 1685 | status = s_pSecFn->QueryContextAttributes(&BACKEND->ctxt->ctxt_handle,
|
---|
| 1686 | SECPKG_ATTR_REMOTE_CERT_CONTEXT,
|
---|
| 1687 | &pCertContextServer);
|
---|
| 1688 |
|
---|
| 1689 | if((status != SEC_E_OK) || (pCertContextServer == NULL)) {
|
---|
| 1690 | failf(data, "schannel: Failed to read remote certificate context: %s",
|
---|
| 1691 | Curl_sspi_strerror(conn, status));
|
---|
| 1692 | result = CURLE_PEER_FAILED_VERIFICATION;
|
---|
| 1693 | }
|
---|
| 1694 |
|
---|
| 1695 | if(result == CURLE_OK) {
|
---|
| 1696 | CERT_CHAIN_PARA ChainPara;
|
---|
| 1697 | memset(&ChainPara, 0, sizeof(ChainPara));
|
---|
| 1698 | ChainPara.cbSize = sizeof(ChainPara);
|
---|
| 1699 |
|
---|
| 1700 | if(!CertGetCertificateChain(NULL,
|
---|
| 1701 | pCertContextServer,
|
---|
| 1702 | NULL,
|
---|
| 1703 | pCertContextServer->hCertStore,
|
---|
| 1704 | &ChainPara,
|
---|
| 1705 | (data->set.ssl.no_revoke ? 0 :
|
---|
| 1706 | CERT_CHAIN_REVOCATION_CHECK_CHAIN),
|
---|
| 1707 | NULL,
|
---|
| 1708 | &pChainContext)) {
|
---|
| 1709 | failf(data, "schannel: CertGetCertificateChain failed: %s",
|
---|
| 1710 | Curl_sspi_strerror(conn, GetLastError()));
|
---|
| 1711 | pChainContext = NULL;
|
---|
| 1712 | result = CURLE_PEER_FAILED_VERIFICATION;
|
---|
| 1713 | }
|
---|
| 1714 |
|
---|
| 1715 | if(result == CURLE_OK) {
|
---|
| 1716 | CERT_SIMPLE_CHAIN *pSimpleChain = pChainContext->rgpChain[0];
|
---|
| 1717 | DWORD dwTrustErrorMask = ~(DWORD)(CERT_TRUST_IS_NOT_TIME_NESTED);
|
---|
| 1718 | dwTrustErrorMask &= pSimpleChain->TrustStatus.dwErrorStatus;
|
---|
| 1719 | if(dwTrustErrorMask) {
|
---|
| 1720 | if(dwTrustErrorMask & CERT_TRUST_IS_REVOKED)
|
---|
| 1721 | failf(data, "schannel: CertGetCertificateChain trust error"
|
---|
| 1722 | " CERT_TRUST_IS_REVOKED");
|
---|
| 1723 | else if(dwTrustErrorMask & CERT_TRUST_IS_PARTIAL_CHAIN)
|
---|
| 1724 | failf(data, "schannel: CertGetCertificateChain trust error"
|
---|
| 1725 | " CERT_TRUST_IS_PARTIAL_CHAIN");
|
---|
| 1726 | else if(dwTrustErrorMask & CERT_TRUST_IS_UNTRUSTED_ROOT)
|
---|
| 1727 | failf(data, "schannel: CertGetCertificateChain trust error"
|
---|
| 1728 | " CERT_TRUST_IS_UNTRUSTED_ROOT");
|
---|
| 1729 | else if(dwTrustErrorMask & CERT_TRUST_IS_NOT_TIME_VALID)
|
---|
| 1730 | failf(data, "schannel: CertGetCertificateChain trust error"
|
---|
| 1731 | " CERT_TRUST_IS_NOT_TIME_VALID");
|
---|
| 1732 | else
|
---|
| 1733 | failf(data, "schannel: CertGetCertificateChain error mask: 0x%08x",
|
---|
| 1734 | dwTrustErrorMask);
|
---|
| 1735 | result = CURLE_PEER_FAILED_VERIFICATION;
|
---|
| 1736 | }
|
---|
| 1737 | }
|
---|
| 1738 | }
|
---|
| 1739 |
|
---|
| 1740 | if(result == CURLE_OK) {
|
---|
| 1741 | if(conn->ssl_config.verifyhost) {
|
---|
| 1742 | TCHAR cert_hostname_buff[256];
|
---|
| 1743 | DWORD len;
|
---|
| 1744 |
|
---|
| 1745 | /* TODO: Fix this for certificates with multiple alternative names.
|
---|
| 1746 | Right now we're only asking for the first preferred alternative name.
|
---|
| 1747 | Instead we'd need to do all via CERT_NAME_SEARCH_ALL_NAMES_FLAG
|
---|
| 1748 | (if WinCE supports that?) and run this section in a loop for each.
|
---|
| 1749 | https://msdn.microsoft.com/en-us/library/windows/desktop/aa376086.aspx
|
---|
| 1750 | curl: (51) schannel: CertGetNameString() certificate hostname
|
---|
| 1751 | (.google.com) did not match connection (google.com)
|
---|
| 1752 | */
|
---|
| 1753 | len = CertGetNameString(pCertContextServer,
|
---|
| 1754 | CERT_NAME_DNS_TYPE,
|
---|
| 1755 | CERT_NAME_DISABLE_IE4_UTF8_FLAG,
|
---|
| 1756 | NULL,
|
---|
| 1757 | cert_hostname_buff,
|
---|
| 1758 | 256);
|
---|
| 1759 | if(len > 0) {
|
---|
| 1760 | const char *cert_hostname;
|
---|
| 1761 |
|
---|
| 1762 | /* Comparing the cert name and the connection hostname encoded as UTF-8
|
---|
| 1763 | * is acceptable since both values are assumed to use ASCII
|
---|
| 1764 | * (or some equivalent) encoding
|
---|
| 1765 | */
|
---|
| 1766 | cert_hostname = Curl_convert_tchar_to_UTF8(cert_hostname_buff);
|
---|
| 1767 | if(!cert_hostname) {
|
---|
| 1768 | result = CURLE_OUT_OF_MEMORY;
|
---|
| 1769 | }
|
---|
| 1770 | else{
|
---|
| 1771 | int match_result;
|
---|
| 1772 |
|
---|
| 1773 | match_result = Curl_cert_hostcheck(cert_hostname, conn->host.name);
|
---|
| 1774 | if(match_result == CURL_HOST_MATCH) {
|
---|
| 1775 | infof(data,
|
---|
| 1776 | "schannel: connection hostname (%s) validated "
|
---|
| 1777 | "against certificate name (%s)\n",
|
---|
| 1778 | conn->host.name,
|
---|
| 1779 | cert_hostname);
|
---|
| 1780 | result = CURLE_OK;
|
---|
| 1781 | }
|
---|
| 1782 | else{
|
---|
| 1783 | failf(data,
|
---|
| 1784 | "schannel: connection hostname (%s) "
|
---|
| 1785 | "does not match certificate name (%s)",
|
---|
| 1786 | conn->host.name,
|
---|
| 1787 | cert_hostname);
|
---|
| 1788 | result = CURLE_PEER_FAILED_VERIFICATION;
|
---|
| 1789 | }
|
---|
| 1790 | Curl_unicodefree(cert_hostname);
|
---|
| 1791 | }
|
---|
| 1792 | }
|
---|
| 1793 | else {
|
---|
| 1794 | failf(data,
|
---|
| 1795 | "schannel: CertGetNameString did not provide any "
|
---|
| 1796 | "certificate name information");
|
---|
| 1797 | result = CURLE_PEER_FAILED_VERIFICATION;
|
---|
| 1798 | }
|
---|
| 1799 | }
|
---|
| 1800 | }
|
---|
| 1801 |
|
---|
| 1802 | if(pChainContext)
|
---|
| 1803 | CertFreeCertificateChain(pChainContext);
|
---|
| 1804 |
|
---|
| 1805 | if(pCertContextServer)
|
---|
| 1806 | CertFreeCertificateContext(pCertContextServer);
|
---|
| 1807 |
|
---|
| 1808 | return result;
|
---|
| 1809 | }
|
---|
| 1810 | #endif /* _WIN32_WCE */
|
---|
| 1811 |
|
---|
| 1812 | static void *Curl_schannel_get_internals(struct ssl_connect_data *connssl,
|
---|
| 1813 | CURLINFO info UNUSED_PARAM)
|
---|
| 1814 | {
|
---|
| 1815 | (void)info;
|
---|
| 1816 | return &BACKEND->ctxt->ctxt_handle;
|
---|
| 1817 | }
|
---|
| 1818 |
|
---|
| 1819 | const struct Curl_ssl Curl_ssl_schannel = {
|
---|
| 1820 | { CURLSSLBACKEND_SCHANNEL, "schannel" }, /* info */
|
---|
| 1821 |
|
---|
| 1822 | 0, /* have_ca_path */
|
---|
| 1823 | 1, /* have_certinfo */
|
---|
| 1824 | 0, /* have_pinnedpubkey */
|
---|
| 1825 | 0, /* have_ssl_ctx */
|
---|
| 1826 | 0, /* support_https_proxy */
|
---|
| 1827 |
|
---|
| 1828 | sizeof(struct ssl_backend_data),
|
---|
| 1829 |
|
---|
| 1830 | Curl_schannel_init, /* init */
|
---|
| 1831 | Curl_schannel_cleanup, /* cleanup */
|
---|
| 1832 | Curl_schannel_version, /* version */
|
---|
| 1833 | Curl_none_check_cxn, /* check_cxn */
|
---|
| 1834 | Curl_schannel_shutdown, /* shutdown */
|
---|
| 1835 | Curl_schannel_data_pending, /* data_pending */
|
---|
| 1836 | Curl_schannel_random, /* random */
|
---|
| 1837 | Curl_none_cert_status_request, /* cert_status_request */
|
---|
| 1838 | Curl_schannel_connect, /* connect */
|
---|
| 1839 | Curl_schannel_connect_nonblocking, /* connect_nonblocking */
|
---|
| 1840 | Curl_schannel_get_internals, /* get_internals */
|
---|
| 1841 | Curl_schannel_close, /* close_one */
|
---|
| 1842 | Curl_none_close_all, /* close_all */
|
---|
| 1843 | Curl_schannel_session_free, /* session_free */
|
---|
| 1844 | Curl_none_set_engine, /* set_engine */
|
---|
| 1845 | Curl_none_set_engine_default, /* set_engine_default */
|
---|
| 1846 | Curl_none_engines_list, /* engines_list */
|
---|
| 1847 | Curl_none_false_start, /* false_start */
|
---|
| 1848 | Curl_none_md5sum, /* md5sum */
|
---|
| 1849 | NULL /* sha256sum */
|
---|
| 1850 | };
|
---|
| 1851 |
|
---|
| 1852 | #endif /* USE_SCHANNEL */
|
---|