[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 | #if defined(HAVE_GSSAPI) && !defined(CURL_DISABLE_HTTP) && defined(USE_SPNEGO)
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| 26 |
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| 27 | #include "urldata.h"
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| 28 | #include "sendf.h"
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| 29 | #include "curl_gssapi.h"
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| 30 | #include "rawstr.h"
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| 31 | #include "curl_base64.h"
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| 32 | #include "http_negotiate.h"
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| 33 | #include "curl_sasl.h"
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| 34 | #include "url.h"
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| 35 | #include "curl_printf.h"
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| 36 |
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| 37 | /* The last #include files should be: */
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| 38 | #include "curl_memory.h"
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| 39 | #include "memdebug.h"
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| 40 |
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| 41 | CURLcode Curl_input_negotiate(struct connectdata *conn, bool proxy,
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| 42 | const char *header)
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| 43 | {
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| 44 | struct SessionHandle *data = conn->data;
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| 45 | struct negotiatedata *neg_ctx = proxy?&data->state.proxyneg:
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| 46 | &data->state.negotiate;
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| 47 | OM_uint32 major_status, minor_status, discard_st;
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| 48 | gss_buffer_desc spn_token = GSS_C_EMPTY_BUFFER;
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| 49 | gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
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| 50 | gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
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| 51 | size_t len;
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| 52 | size_t rawlen = 0;
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| 53 | CURLcode result;
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| 54 |
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| 55 | if(neg_ctx->context && neg_ctx->status == GSS_S_COMPLETE) {
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| 56 | /* We finished successfully our part of authentication, but server
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| 57 | * rejected it (since we're again here). Exit with an error since we
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| 58 | * can't invent anything better */
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| 59 | Curl_cleanup_negotiate(data);
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| 60 | return CURLE_LOGIN_DENIED;
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| 61 | }
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| 62 |
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| 63 | if(!neg_ctx->server_name) {
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| 64 | /* Generate our SPN */
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| 65 | char *spn = Curl_sasl_build_gssapi_spn(
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| 66 | proxy ? data->set.str[STRING_PROXY_SERVICE_NAME] :
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| 67 | data->set.str[STRING_SERVICE_NAME],
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| 68 | proxy ? conn->proxy.name : conn->host.name);
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| 69 | if(!spn)
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| 70 | return CURLE_OUT_OF_MEMORY;
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| 71 |
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| 72 | /* Populate the SPN structure */
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| 73 | spn_token.value = spn;
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| 74 | spn_token.length = strlen(spn);
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| 75 |
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| 76 | /* Import the SPN */
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| 77 | major_status = gss_import_name(&minor_status, &spn_token,
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| 78 | GSS_C_NT_HOSTBASED_SERVICE,
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| 79 | &neg_ctx->server_name);
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| 80 | if(GSS_ERROR(major_status)) {
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| 81 | Curl_gss_log_error(data, minor_status, "gss_import_name() failed: ");
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| 82 |
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| 83 | free(spn);
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| 84 |
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| 85 | return CURLE_OUT_OF_MEMORY;
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| 86 | }
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| 87 |
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| 88 | free(spn);
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| 89 | }
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| 90 |
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| 91 | header += strlen("Negotiate");
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| 92 | while(*header && ISSPACE(*header))
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| 93 | header++;
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| 94 |
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| 95 | len = strlen(header);
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| 96 | if(len > 0) {
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| 97 | result = Curl_base64_decode(header, (unsigned char **)&input_token.value,
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| 98 | &rawlen);
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| 99 | if(result)
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| 100 | return result;
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| 101 |
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| 102 | if(!rawlen) {
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| 103 | infof(data, "Negotiate handshake failure (empty challenge message)\n");
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| 104 |
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| 105 | return CURLE_BAD_CONTENT_ENCODING;
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| 106 | }
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| 107 |
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| 108 | input_token.length = rawlen;
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| 109 |
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| 110 | DEBUGASSERT(input_token.value != NULL);
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| 111 | }
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| 112 |
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| 113 | major_status = Curl_gss_init_sec_context(data,
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| 114 | &minor_status,
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| 115 | &neg_ctx->context,
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| 116 | neg_ctx->server_name,
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| 117 | &Curl_spnego_mech_oid,
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| 118 | GSS_C_NO_CHANNEL_BINDINGS,
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| 119 | &input_token,
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| 120 | &output_token,
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| 121 | TRUE,
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| 122 | NULL);
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| 123 | Curl_safefree(input_token.value);
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| 124 |
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| 125 | neg_ctx->status = major_status;
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| 126 | if(GSS_ERROR(major_status)) {
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| 127 | if(output_token.value)
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| 128 | gss_release_buffer(&discard_st, &output_token);
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| 129 | Curl_gss_log_error(conn->data, minor_status,
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| 130 | "gss_init_sec_context() failed: ");
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| 131 | return CURLE_OUT_OF_MEMORY;
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| 132 | }
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| 133 |
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| 134 | if(!output_token.value || !output_token.length) {
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| 135 | if(output_token.value)
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| 136 | gss_release_buffer(&discard_st, &output_token);
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| 137 | return CURLE_OUT_OF_MEMORY;
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| 138 | }
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| 139 |
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| 140 | neg_ctx->output_token = output_token;
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| 141 |
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| 142 | return CURLE_OK;
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| 143 | }
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| 144 |
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| 145 | CURLcode Curl_output_negotiate(struct connectdata *conn, bool proxy)
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| 146 | {
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| 147 | struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
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| 148 | &conn->data->state.negotiate;
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| 149 | char *encoded = NULL;
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| 150 | size_t len = 0;
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| 151 | char *userp;
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| 152 | CURLcode result;
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| 153 | OM_uint32 discard_st;
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| 154 |
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| 155 | result = Curl_base64_encode(conn->data,
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| 156 | neg_ctx->output_token.value,
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| 157 | neg_ctx->output_token.length,
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| 158 | &encoded, &len);
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| 159 | if(result) {
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| 160 | gss_release_buffer(&discard_st, &neg_ctx->output_token);
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| 161 | neg_ctx->output_token.value = NULL;
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| 162 | neg_ctx->output_token.length = 0;
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| 163 | return result;
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| 164 | }
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| 165 |
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| 166 | if(!encoded || !len) {
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| 167 | gss_release_buffer(&discard_st, &neg_ctx->output_token);
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| 168 | neg_ctx->output_token.value = NULL;
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| 169 | neg_ctx->output_token.length = 0;
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| 170 | return CURLE_REMOTE_ACCESS_DENIED;
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| 171 | }
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| 172 |
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| 173 | userp = aprintf("%sAuthorization: Negotiate %s\r\n", proxy ? "Proxy-" : "",
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| 174 | encoded);
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| 175 | if(proxy) {
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| 176 | Curl_safefree(conn->allocptr.proxyuserpwd);
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| 177 | conn->allocptr.proxyuserpwd = userp;
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| 178 | }
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| 179 | else {
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| 180 | Curl_safefree(conn->allocptr.userpwd);
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| 181 | conn->allocptr.userpwd = userp;
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| 182 | }
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| 183 |
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| 184 | free(encoded);
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| 185 |
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| 186 | return (userp == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK;
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| 187 | }
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| 188 |
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| 189 | static void cleanup(struct negotiatedata *neg_ctx)
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| 190 | {
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| 191 | OM_uint32 minor_status;
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| 192 | if(neg_ctx->context != GSS_C_NO_CONTEXT)
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| 193 | gss_delete_sec_context(&minor_status, &neg_ctx->context, GSS_C_NO_BUFFER);
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| 194 |
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| 195 | if(neg_ctx->output_token.value)
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| 196 | gss_release_buffer(&minor_status, &neg_ctx->output_token);
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| 197 |
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| 198 | if(neg_ctx->server_name != GSS_C_NO_NAME)
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| 199 | gss_release_name(&minor_status, &neg_ctx->server_name);
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| 200 |
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| 201 | memset(neg_ctx, 0, sizeof(*neg_ctx));
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| 202 | }
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| 203 |
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| 204 | void Curl_cleanup_negotiate(struct SessionHandle *data)
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| 205 | {
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| 206 | cleanup(&data->state.negotiate);
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| 207 | cleanup(&data->state.proxyneg);
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| 208 | }
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| 209 |
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| 210 | #endif /* HAVE_GSSAPI && !CURL_DISABLE_HTTP && USE_SPNEGO */
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