1/*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al. 9 * 10 * This software is licensed as described in the file COPYING, which 11 * you should have received as part of this distribution. The terms 12 * are also available at http://curl.haxx.se/docs/copyright.html. 13 * 14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell 15 * copies of the Software, and permit persons to whom the Software is 16 * furnished to do so, under the terms of the COPYING file. 17 * 18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY 19 * KIND, either express or implied. 20 * 21 ***************************************************************************/ 22 23#include "setup.h" 24 25#ifdef USE_WINDOWS_SSPI 26 27#ifndef CURL_DISABLE_HTTP 28 29#include "urldata.h" 30#include "sendf.h" 31#include "rawstr.h" 32#include "curl_base64.h" 33#include "http_negotiate.h" 34#include "curl_memory.h" 35 36#define _MPRINTF_REPLACE /* use our functions only */ 37#include <curl/mprintf.h> 38 39/* The last #include file should be: */ 40#include "memdebug.h" 41 42static int 43get_gss_name(struct connectdata *conn, bool proxy, 44 struct negotiatedata *neg_ctx) 45{ 46 const char* service; 47 size_t length; 48 49 if(proxy && !conn->proxy.name) 50 /* proxy auth requested but no given proxy name, error out! */ 51 return -1; 52 53 /* GSSAPI implementation by Globus (known as GSI) requires the name to be 54 of form "<service>/<fqdn>" instead of <service>@<fqdn> (ie. slash instead 55 of at-sign). Also GSI servers are often identified as 'host' not 'khttp'. 56 Change following lines if you want to use GSI */ 57 58 /* IIS uses the <service>@<fqdn> form but uses 'http' as the service name, 59 and SSPI then generates an NTLM token. When using <service>/<fqdn> a 60 Kerberos token is generated. */ 61 62 if(neg_ctx->gss) 63 service = "KHTTP"; 64 else 65 service = "HTTP"; 66 67 length = strlen(service) + 1 + strlen(proxy ? conn->proxy.name : 68 conn->host.name) + 1; 69 if(length + 1 > sizeof(neg_ctx->server_name)) 70 return EMSGSIZE; 71 72 snprintf(neg_ctx->server_name, sizeof(neg_ctx->server_name), "%s/%s", 73 service, proxy ? conn->proxy.name : conn->host.name); 74 75 return 0; 76} 77 78/* returning zero (0) means success, everything else is treated as "failure" 79 with no care exactly what the failure was */ 80int Curl_input_negotiate(struct connectdata *conn, bool proxy, 81 const char *header) 82{ 83 struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg: 84 &conn->data->state.negotiate; 85 BYTE *input_token = 0; 86 SecBufferDesc out_buff_desc; 87 SecBuffer out_sec_buff; 88 SecBufferDesc in_buff_desc; 89 SecBuffer in_sec_buff; 90 ULONG context_attributes; 91 TimeStamp lifetime; 92 93 int ret; 94 size_t len = 0, input_token_len = 0; 95 bool gss = FALSE; 96 const char* protocol; 97 CURLcode error; 98 99 while(*header && ISSPACE(*header)) 100 header++; 101 102 if(checkprefix("GSS-Negotiate", header)) { 103 protocol = "GSS-Negotiate"; 104 gss = TRUE; 105 } 106 else if(checkprefix("Negotiate", header)) { 107 protocol = "Negotiate"; 108 gss = FALSE; 109 } 110 else 111 return -1; 112 113 if(neg_ctx->context) { 114 if(neg_ctx->gss != gss) { 115 return -1; 116 } 117 } 118 else { 119 neg_ctx->protocol = protocol; 120 neg_ctx->gss = gss; 121 } 122 123 if(neg_ctx->context && neg_ctx->status == SEC_E_OK) { 124 /* We finished successfully our part of authentication, but server 125 * rejected it (since we're again here). Exit with an error since we 126 * can't invent anything better */ 127 Curl_cleanup_negotiate(conn->data); 128 return -1; 129 } 130 131 if(0 == strlen(neg_ctx->server_name)) { 132 ret = get_gss_name(conn, proxy, neg_ctx); 133 if(ret) 134 return ret; 135 } 136 137 if(!neg_ctx->output_token) { 138 PSecPkgInfo SecurityPackage; 139 ret = s_pSecFn->QuerySecurityPackageInfo((SEC_CHAR *)"Negotiate", 140 &SecurityPackage); 141 if(ret != SEC_E_OK) 142 return -1; 143 144 /* Allocate input and output buffers according to the max token size 145 as indicated by the security package */ 146 neg_ctx->max_token_length = SecurityPackage->cbMaxToken; 147 neg_ctx->output_token = malloc(neg_ctx->max_token_length); 148 s_pSecFn->FreeContextBuffer(SecurityPackage); 149 } 150 151 /* Obtain the input token, if any */ 152 header += strlen(neg_ctx->protocol); 153 while(*header && ISSPACE(*header)) 154 header++; 155 156 len = strlen(header); 157 if(!len) { 158 /* first call in a new negotation, we have to acquire credentials, 159 and allocate memory for the context */ 160 161 neg_ctx->credentials = malloc(sizeof(CredHandle)); 162 neg_ctx->context = malloc(sizeof(CtxtHandle)); 163 164 if(!neg_ctx->credentials || !neg_ctx->context) 165 return -1; 166 167 neg_ctx->status = 168 s_pSecFn->AcquireCredentialsHandle(NULL, (SEC_CHAR *)"Negotiate", 169 SECPKG_CRED_OUTBOUND, NULL, NULL, 170 NULL, NULL, neg_ctx->credentials, 171 &lifetime); 172 if(neg_ctx->status != SEC_E_OK) 173 return -1; 174 } 175 else { 176 input_token = malloc(neg_ctx->max_token_length); 177 if(!input_token) 178 return -1; 179 180 error = Curl_base64_decode(header, 181 (unsigned char **)&input_token, 182 &input_token_len); 183 if(error || input_token_len == 0) 184 return -1; 185 } 186 187 /* prepare the output buffers, and input buffers if present */ 188 out_buff_desc.ulVersion = 0; 189 out_buff_desc.cBuffers = 1; 190 out_buff_desc.pBuffers = &out_sec_buff; 191 192 out_sec_buff.cbBuffer = neg_ctx->max_token_length; 193 out_sec_buff.BufferType = SECBUFFER_TOKEN; 194 out_sec_buff.pvBuffer = neg_ctx->output_token; 195 196 197 if(input_token) { 198 in_buff_desc.ulVersion = 0; 199 in_buff_desc.cBuffers = 1; 200 in_buff_desc.pBuffers = &out_sec_buff; 201 202 in_sec_buff.cbBuffer = input_token_len; 203 in_sec_buff.BufferType = SECBUFFER_TOKEN; 204 in_sec_buff.pvBuffer = input_token; 205 } 206 207 neg_ctx->status = s_pSecFn->InitializeSecurityContext( 208 neg_ctx->credentials, 209 input_token ? neg_ctx->context : 0, 210 neg_ctx->server_name, 211 ISC_REQ_CONFIDENTIALITY, 212 0, 213 SECURITY_NATIVE_DREP, 214 input_token ? &in_buff_desc : 0, 215 0, 216 neg_ctx->context, 217 &out_buff_desc, 218 &context_attributes, 219 &lifetime); 220 221 if(GSS_ERROR(neg_ctx->status)) 222 return -1; 223 224 if(neg_ctx->status == SEC_I_COMPLETE_NEEDED || 225 neg_ctx->status == SEC_I_COMPLETE_AND_CONTINUE) { 226 neg_ctx->status = s_pSecFn->CompleteAuthToken(neg_ctx->context, 227 &out_buff_desc); 228 if(GSS_ERROR(neg_ctx->status)) 229 return -1; 230 } 231 232 neg_ctx->output_token_length = out_sec_buff.cbBuffer; 233 234 return 0; 235} 236 237 238CURLcode Curl_output_negotiate(struct connectdata *conn, bool proxy) 239{ 240 struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg: 241 &conn->data->state.negotiate; 242 char *encoded = NULL; 243 size_t len = 0; 244 char *userp; 245 CURLcode error; 246 247 error = Curl_base64_encode(conn->data, 248 (const char*)neg_ctx->output_token, 249 neg_ctx->output_token_length, 250 &encoded, &len); 251 if(error) 252 return error; 253 254 if(len == 0) 255 return CURLE_REMOTE_ACCESS_DENIED; 256 257 userp = aprintf("%sAuthorization: %s %s\r\n", proxy ? "Proxy-" : "", 258 neg_ctx->protocol, encoded); 259 260 if(proxy) 261 conn->allocptr.proxyuserpwd = userp; 262 else 263 conn->allocptr.userpwd = userp; 264 free(encoded); 265 Curl_cleanup_negotiate (conn->data); 266 return (userp == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK; 267} 268 269static void cleanup(struct negotiatedata *neg_ctx) 270{ 271 if(neg_ctx->context) { 272 s_pSecFn->DeleteSecurityContext(neg_ctx->context); 273 free(neg_ctx->context); 274 neg_ctx->context = 0; 275 } 276 277 if(neg_ctx->credentials) { 278 s_pSecFn->FreeCredentialsHandle(neg_ctx->credentials); 279 free(neg_ctx->credentials); 280 neg_ctx->credentials = 0; 281 } 282 283 if(neg_ctx->output_token) { 284 free(neg_ctx->output_token); 285 neg_ctx->output_token = 0; 286 } 287 288 neg_ctx->max_token_length = 0; 289} 290 291void Curl_cleanup_negotiate(struct SessionHandle *data) 292{ 293 cleanup(&data->state.negotiate); 294 cleanup(&data->state.proxyneg); 295} 296 297 298#endif 299#endif 300