[164] | 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) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
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| 9 | *
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| 10 | * This software is licensed as described in the file COPYING, which
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| 11 | * you should have received as part of this distribution. The terms
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| 12 | * are also available at https://curl.haxx.se/docs/copyright.html.
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| 13 | *
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| 14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 15 | * copies of the Software, and permit persons to whom the Software is
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| 16 | * furnished to do so, under the terms of the COPYING file.
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| 17 | *
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| 18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 19 | * KIND, either express or implied.
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| 20 | *
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| 21 | ***************************************************************************/
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| 22 |
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| 23 | #include "curl_setup.h"
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| 24 |
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| 25 | #ifdef USE_WINDOWS_SSPI
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| 26 |
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| 27 | #if !defined(CURL_DISABLE_HTTP) && defined(USE_SPNEGO)
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| 28 |
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| 29 | #include "urldata.h"
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| 30 | #include "sendf.h"
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| 31 | #include "rawstr.h"
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| 32 | #include "warnless.h"
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| 33 | #include "curl_base64.h"
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| 34 | #include "curl_sasl.h"
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| 35 | #include "http_negotiate.h"
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| 36 | #include "curl_multibyte.h"
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| 37 | #include "curl_printf.h"
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| 38 |
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| 39 | /* The last #include files should be: */
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| 40 | #include "curl_memory.h"
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| 41 | #include "memdebug.h"
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| 42 |
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| 43 | CURLcode Curl_input_negotiate(struct connectdata *conn, bool proxy,
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| 44 | const char *header)
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| 45 | {
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| 46 | struct SessionHandle *data = conn->data;
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| 47 | BYTE *input_token = NULL;
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| 48 | SecBufferDesc out_buff_desc;
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| 49 | SecBuffer out_sec_buff;
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| 50 | SecBufferDesc in_buff_desc;
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| 51 | SecBuffer in_sec_buff;
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| 52 | SECURITY_STATUS status;
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| 53 | unsigned long attrs;
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| 54 | TimeStamp expiry; /* For Windows 9x compatibility of SSPI calls */
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| 55 | size_t len = 0, input_token_len = 0;
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| 56 | CURLcode result;
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| 57 |
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| 58 | /* Point to the username and password */
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| 59 | const char *userp;
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| 60 | const char *passwdp;
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| 61 |
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| 62 | /* Point to the correct struct with this */
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| 63 | struct negotiatedata *neg_ctx;
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| 64 |
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| 65 | if(proxy) {
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| 66 | userp = conn->proxyuser;
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| 67 | passwdp = conn->proxypasswd;
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| 68 | neg_ctx = &data->state.proxyneg;
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| 69 | }
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| 70 | else {
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| 71 | userp = conn->user;
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| 72 | passwdp = conn->passwd;
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| 73 | neg_ctx = &data->state.negotiate;
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| 74 | }
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| 75 |
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| 76 | /* Not set means empty */
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| 77 | if(!userp)
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| 78 | userp = "";
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| 79 |
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| 80 | if(!passwdp)
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| 81 | passwdp = "";
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| 82 |
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| 83 | if(neg_ctx->context && neg_ctx->status == SEC_E_OK) {
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| 84 | /* We finished successfully our part of authentication, but server
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| 85 | * rejected it (since we're again here). Exit with an error since we
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| 86 | * can't invent anything better */
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| 87 | Curl_cleanup_negotiate(data);
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| 88 | return CURLE_LOGIN_DENIED;
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| 89 | }
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| 90 |
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| 91 | if(!neg_ctx->server_name) {
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| 92 | /* Check proxy auth requested but no given proxy name */
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| 93 | if(proxy && !conn->proxy.name)
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| 94 | return CURLE_BAD_FUNCTION_ARGUMENT;
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| 95 |
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| 96 | /* Generate our SPN */
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| 97 | neg_ctx->server_name = Curl_sasl_build_spn(
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| 98 | proxy ? data->set.str[STRING_PROXY_SERVICE_NAME] :
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| 99 | data->set.str[STRING_SERVICE_NAME],
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| 100 | proxy ? conn->proxy.name : conn->host.name);
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| 101 | if(!neg_ctx->server_name)
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| 102 | return CURLE_OUT_OF_MEMORY;
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| 103 | }
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| 104 |
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| 105 | if(!neg_ctx->output_token) {
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| 106 | PSecPkgInfo SecurityPackage;
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| 107 | status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *)
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| 108 | TEXT(SP_NAME_NEGOTIATE),
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| 109 | &SecurityPackage);
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| 110 | if(status != SEC_E_OK)
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| 111 | return CURLE_NOT_BUILT_IN;
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| 112 |
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| 113 | /* Allocate input and output buffers according to the max token size
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| 114 | as indicated by the security package */
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| 115 | neg_ctx->token_max = SecurityPackage->cbMaxToken;
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| 116 | neg_ctx->output_token = malloc(neg_ctx->token_max);
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| 117 | s_pSecFn->FreeContextBuffer(SecurityPackage);
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| 118 | }
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| 119 |
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| 120 | /* Obtain the input token, if any */
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| 121 | header += strlen("Negotiate");
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| 122 | while(*header && ISSPACE(*header))
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| 123 | header++;
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| 124 |
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| 125 | len = strlen(header);
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| 126 | if(!len) {
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| 127 | /* Is this the first call in a new negotiation? */
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| 128 | if(neg_ctx->context) {
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| 129 | /* The server rejected our authentication and hasn't suppled any more
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| 130 | negotiation mechanisms */
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| 131 | return CURLE_LOGIN_DENIED;
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| 132 | }
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| 133 |
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| 134 | /* We have to acquire credentials and allocate memory for the context */
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| 135 | neg_ctx->credentials = malloc(sizeof(CredHandle));
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| 136 | neg_ctx->context = malloc(sizeof(CtxtHandle));
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| 137 |
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| 138 | if(!neg_ctx->credentials || !neg_ctx->context)
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| 139 | return CURLE_OUT_OF_MEMORY;
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| 140 |
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| 141 | if(userp && *userp) {
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| 142 | /* Populate our identity structure */
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| 143 | result = Curl_create_sspi_identity(userp, passwdp, &neg_ctx->identity);
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| 144 | if(result)
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| 145 | return result;
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| 146 |
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| 147 | /* Allow proper cleanup of the identity structure */
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| 148 | neg_ctx->p_identity = &neg_ctx->identity;
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| 149 | }
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| 150 | else
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| 151 | /* Use the current Windows user */
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| 152 | neg_ctx->p_identity = NULL;
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| 153 |
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| 154 | /* Acquire our credientials handle */
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| 155 | neg_ctx->status =
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| 156 | s_pSecFn->AcquireCredentialsHandle(NULL,
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| 157 | (TCHAR *) TEXT(SP_NAME_NEGOTIATE),
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| 158 | SECPKG_CRED_OUTBOUND, NULL,
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| 159 | neg_ctx->p_identity, NULL, NULL,
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| 160 | neg_ctx->credentials, &expiry);
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| 161 | if(neg_ctx->status != SEC_E_OK)
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| 162 | return CURLE_LOGIN_DENIED;
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| 163 | }
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| 164 | else {
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| 165 | result = Curl_base64_decode(header,
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| 166 | (unsigned char **)&input_token,
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| 167 | &input_token_len);
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| 168 | if(result)
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| 169 | return result;
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| 170 |
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| 171 | if(!input_token_len) {
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| 172 | infof(data,
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| 173 | "Negotiate handshake failure (empty challenge message)\n");
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| 174 |
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| 175 | return CURLE_BAD_CONTENT_ENCODING;
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| 176 | }
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| 177 | }
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| 178 |
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| 179 | /* Setup the "output" security buffer */
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| 180 | out_buff_desc.ulVersion = SECBUFFER_VERSION;
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| 181 | out_buff_desc.cBuffers = 1;
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| 182 | out_buff_desc.pBuffers = &out_sec_buff;
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| 183 | out_sec_buff.BufferType = SECBUFFER_TOKEN;
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| 184 | out_sec_buff.pvBuffer = neg_ctx->output_token;
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| 185 | out_sec_buff.cbBuffer = curlx_uztoul(neg_ctx->token_max);
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| 186 |
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| 187 | /* Setup the "input" security buffer if present */
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| 188 | if(input_token) {
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| 189 | in_buff_desc.ulVersion = SECBUFFER_VERSION;
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| 190 | in_buff_desc.cBuffers = 1;
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| 191 | in_buff_desc.pBuffers = &in_sec_buff;
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| 192 | in_sec_buff.BufferType = SECBUFFER_TOKEN;
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| 193 | in_sec_buff.pvBuffer = input_token;
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| 194 | in_sec_buff.cbBuffer = curlx_uztoul(input_token_len);
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| 195 | }
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| 196 |
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| 197 | /* Generate our message */
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| 198 | neg_ctx->status = s_pSecFn->InitializeSecurityContext(
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| 199 | neg_ctx->credentials,
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| 200 | input_token ? neg_ctx->context : NULL,
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| 201 | neg_ctx->server_name,
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| 202 | ISC_REQ_CONFIDENTIALITY,
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| 203 | 0,
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| 204 | SECURITY_NATIVE_DREP,
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| 205 | input_token ? &in_buff_desc : NULL,
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| 206 | 0,
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| 207 | neg_ctx->context,
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| 208 | &out_buff_desc,
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| 209 | &attrs,
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| 210 | &expiry);
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| 211 |
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| 212 | free(input_token);
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| 213 |
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| 214 | if(GSS_ERROR(neg_ctx->status))
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| 215 | return CURLE_OUT_OF_MEMORY;
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| 216 |
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| 217 | if(neg_ctx->status == SEC_I_COMPLETE_NEEDED ||
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| 218 | neg_ctx->status == SEC_I_COMPLETE_AND_CONTINUE) {
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| 219 | neg_ctx->status = s_pSecFn->CompleteAuthToken(neg_ctx->context,
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| 220 | &out_buff_desc);
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| 221 | if(GSS_ERROR(neg_ctx->status))
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| 222 | return CURLE_RECV_ERROR;
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| 223 | }
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| 224 |
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| 225 | neg_ctx->output_token_length = out_sec_buff.cbBuffer;
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| 226 |
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| 227 | return CURLE_OK;
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| 228 | }
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| 229 |
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| 230 | CURLcode Curl_output_negotiate(struct connectdata *conn, bool proxy)
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| 231 | {
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| 232 | struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
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| 233 | &conn->data->state.negotiate;
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| 234 | char *encoded = NULL;
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| 235 | size_t len = 0;
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| 236 | char *userp;
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| 237 | CURLcode error;
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| 238 |
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| 239 | error = Curl_base64_encode(conn->data,
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| 240 | (const char*)neg_ctx->output_token,
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| 241 | neg_ctx->output_token_length,
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| 242 | &encoded, &len);
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| 243 | if(error)
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| 244 | return error;
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| 245 |
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| 246 | if(!len)
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| 247 | return CURLE_REMOTE_ACCESS_DENIED;
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| 248 |
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| 249 | userp = aprintf("%sAuthorization: Negotiate %s\r\n", proxy ? "Proxy-" : "",
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| 250 | encoded);
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| 251 |
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| 252 | if(proxy) {
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| 253 | Curl_safefree(conn->allocptr.proxyuserpwd);
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| 254 | conn->allocptr.proxyuserpwd = userp;
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| 255 | }
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| 256 | else {
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| 257 | Curl_safefree(conn->allocptr.userpwd);
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| 258 | conn->allocptr.userpwd = userp;
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| 259 | }
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| 260 | free(encoded);
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| 261 | return (userp == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK;
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| 262 | }
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| 263 |
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| 264 | static void cleanup(struct negotiatedata *neg_ctx)
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| 265 | {
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| 266 | /* Free our security context */
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| 267 | if(neg_ctx->context) {
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| 268 | s_pSecFn->DeleteSecurityContext(neg_ctx->context);
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| 269 | free(neg_ctx->context);
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| 270 | neg_ctx->context = NULL;
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| 271 | }
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| 272 |
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| 273 | /* Free our credentials handle */
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| 274 | if(neg_ctx->credentials) {
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| 275 | s_pSecFn->FreeCredentialsHandle(neg_ctx->credentials);
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| 276 | free(neg_ctx->credentials);
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| 277 | neg_ctx->credentials = NULL;
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| 278 | }
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| 279 |
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| 280 | /* Free our identity */
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| 281 | Curl_sspi_free_identity(neg_ctx->p_identity);
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| 282 | neg_ctx->p_identity = NULL;
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| 283 |
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| 284 | /* Free the SPN and output token */
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| 285 | Curl_safefree(neg_ctx->server_name);
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| 286 | Curl_safefree(neg_ctx->output_token);
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| 287 |
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| 288 | /* Reset any variables */
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| 289 | neg_ctx->token_max = 0;
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| 290 | }
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| 291 |
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| 292 | void Curl_cleanup_negotiate(struct SessionHandle *data)
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| 293 | {
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| 294 | cleanup(&data->state.negotiate);
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| 295 | cleanup(&data->state.proxyneg);
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| 296 | }
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| 297 |
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| 298 | #endif /* !CURL_DISABLE_HTTP && USE_SPNEGO */
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| 299 |
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| 300 | #endif /* USE_WINDOWS_SSPI */
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