Annotation of embedaddon/curl/lib/vauth/spnego_gssapi.c, revision 1.1
1.1 ! misho 1: /***************************************************************************
! 2: * _ _ ____ _
! 3: * Project ___| | | | _ \| |
! 4: * / __| | | | |_) | |
! 5: * | (__| |_| | _ <| |___
! 6: * \___|\___/|_| \_\_____|
! 7: *
! 8: * Copyright (C) 1998 - 2019, 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 https://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: * RFC4178 Simple and Protected GSS-API Negotiation Mechanism
! 22: *
! 23: ***************************************************************************/
! 24:
! 25: #include "curl_setup.h"
! 26:
! 27: #if defined(HAVE_GSSAPI) && defined(USE_SPNEGO)
! 28:
! 29: #include <curl/curl.h>
! 30:
! 31: #include "vauth/vauth.h"
! 32: #include "urldata.h"
! 33: #include "curl_base64.h"
! 34: #include "curl_gssapi.h"
! 35: #include "warnless.h"
! 36: #include "curl_multibyte.h"
! 37: #include "sendf.h"
! 38:
! 39: /* The last #include files should be: */
! 40: #include "curl_memory.h"
! 41: #include "memdebug.h"
! 42:
! 43: /*
! 44: * Curl_auth_is_spnego_supported()
! 45: *
! 46: * This is used to evaluate if SPNEGO (Negotiate) is supported.
! 47: *
! 48: * Parameters: None
! 49: *
! 50: * Returns TRUE if Negotiate supported by the GSS-API library.
! 51: */
! 52: bool Curl_auth_is_spnego_supported(void)
! 53: {
! 54: return TRUE;
! 55: }
! 56:
! 57: /*
! 58: * Curl_auth_decode_spnego_message()
! 59: *
! 60: * This is used to decode an already encoded SPNEGO (Negotiate) challenge
! 61: * message.
! 62: *
! 63: * Parameters:
! 64: *
! 65: * data [in] - The session handle.
! 66: * userp [in] - The user name in the format User or Domain\User.
! 67: * passwdp [in] - The user's password.
! 68: * service [in] - The service type such as http, smtp, pop or imap.
! 69: * host [in] - The host name.
! 70: * chlg64 [in] - The optional base64 encoded challenge message.
! 71: * nego [in/out] - The Negotiate data struct being used and modified.
! 72: *
! 73: * Returns CURLE_OK on success.
! 74: */
! 75: CURLcode Curl_auth_decode_spnego_message(struct Curl_easy *data,
! 76: const char *user,
! 77: const char *password,
! 78: const char *service,
! 79: const char *host,
! 80: const char *chlg64,
! 81: struct negotiatedata *nego)
! 82: {
! 83: CURLcode result = CURLE_OK;
! 84: size_t chlglen = 0;
! 85: unsigned char *chlg = NULL;
! 86: OM_uint32 major_status;
! 87: OM_uint32 minor_status;
! 88: OM_uint32 unused_status;
! 89: gss_buffer_desc spn_token = GSS_C_EMPTY_BUFFER;
! 90: gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
! 91: gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
! 92:
! 93: (void) user;
! 94: (void) password;
! 95:
! 96: if(nego->context && nego->status == GSS_S_COMPLETE) {
! 97: /* We finished successfully our part of authentication, but server
! 98: * rejected it (since we're again here). Exit with an error since we
! 99: * can't invent anything better */
! 100: Curl_auth_cleanup_spnego(nego);
! 101: return CURLE_LOGIN_DENIED;
! 102: }
! 103:
! 104: if(!nego->spn) {
! 105: /* Generate our SPN */
! 106: char *spn = Curl_auth_build_spn(service, NULL, host);
! 107: if(!spn)
! 108: return CURLE_OUT_OF_MEMORY;
! 109:
! 110: /* Populate the SPN structure */
! 111: spn_token.value = spn;
! 112: spn_token.length = strlen(spn);
! 113:
! 114: /* Import the SPN */
! 115: major_status = gss_import_name(&minor_status, &spn_token,
! 116: GSS_C_NT_HOSTBASED_SERVICE,
! 117: &nego->spn);
! 118: if(GSS_ERROR(major_status)) {
! 119: Curl_gss_log_error(data, "gss_import_name() failed: ",
! 120: major_status, minor_status);
! 121:
! 122: free(spn);
! 123:
! 124: return CURLE_AUTH_ERROR;
! 125: }
! 126:
! 127: free(spn);
! 128: }
! 129:
! 130: if(chlg64 && *chlg64) {
! 131: /* Decode the base-64 encoded challenge message */
! 132: if(*chlg64 != '=') {
! 133: result = Curl_base64_decode(chlg64, &chlg, &chlglen);
! 134: if(result)
! 135: return result;
! 136: }
! 137:
! 138: /* Ensure we have a valid challenge message */
! 139: if(!chlg) {
! 140: infof(data, "SPNEGO handshake failure (empty challenge message)\n");
! 141:
! 142: return CURLE_BAD_CONTENT_ENCODING;
! 143: }
! 144:
! 145: /* Setup the challenge "input" security buffer */
! 146: input_token.value = chlg;
! 147: input_token.length = chlglen;
! 148: }
! 149:
! 150: /* Generate our challenge-response message */
! 151: major_status = Curl_gss_init_sec_context(data,
! 152: &minor_status,
! 153: &nego->context,
! 154: nego->spn,
! 155: &Curl_spnego_mech_oid,
! 156: GSS_C_NO_CHANNEL_BINDINGS,
! 157: &input_token,
! 158: &output_token,
! 159: TRUE,
! 160: NULL);
! 161:
! 162: /* Free the decoded challenge as it is not required anymore */
! 163: Curl_safefree(input_token.value);
! 164:
! 165: nego->status = major_status;
! 166: if(GSS_ERROR(major_status)) {
! 167: if(output_token.value)
! 168: gss_release_buffer(&unused_status, &output_token);
! 169:
! 170: Curl_gss_log_error(data, "gss_init_sec_context() failed: ",
! 171: major_status, minor_status);
! 172:
! 173: return CURLE_AUTH_ERROR;
! 174: }
! 175:
! 176: if(!output_token.value || !output_token.length) {
! 177: if(output_token.value)
! 178: gss_release_buffer(&unused_status, &output_token);
! 179:
! 180: return CURLE_AUTH_ERROR;
! 181: }
! 182:
! 183: /* Free previous token */
! 184: if(nego->output_token.length && nego->output_token.value)
! 185: gss_release_buffer(&unused_status, &nego->output_token);
! 186:
! 187: nego->output_token = output_token;
! 188:
! 189: return CURLE_OK;
! 190: }
! 191:
! 192: /*
! 193: * Curl_auth_create_spnego_message()
! 194: *
! 195: * This is used to generate an already encoded SPNEGO (Negotiate) response
! 196: * message ready for sending to the recipient.
! 197: *
! 198: * Parameters:
! 199: *
! 200: * data [in] - The session handle.
! 201: * nego [in/out] - The Negotiate data struct being used and modified.
! 202: * outptr [in/out] - The address where a pointer to newly allocated memory
! 203: * holding the result will be stored upon completion.
! 204: * outlen [out] - The length of the output message.
! 205: *
! 206: * Returns CURLE_OK on success.
! 207: */
! 208: CURLcode Curl_auth_create_spnego_message(struct Curl_easy *data,
! 209: struct negotiatedata *nego,
! 210: char **outptr, size_t *outlen)
! 211: {
! 212: CURLcode result;
! 213: OM_uint32 minor_status;
! 214:
! 215: /* Base64 encode the already generated response */
! 216: result = Curl_base64_encode(data,
! 217: nego->output_token.value,
! 218: nego->output_token.length,
! 219: outptr, outlen);
! 220:
! 221: if(result) {
! 222: gss_release_buffer(&minor_status, &nego->output_token);
! 223: nego->output_token.value = NULL;
! 224: nego->output_token.length = 0;
! 225:
! 226: return result;
! 227: }
! 228:
! 229: if(!*outptr || !*outlen) {
! 230: gss_release_buffer(&minor_status, &nego->output_token);
! 231: nego->output_token.value = NULL;
! 232: nego->output_token.length = 0;
! 233:
! 234: return CURLE_REMOTE_ACCESS_DENIED;
! 235: }
! 236:
! 237: return CURLE_OK;
! 238: }
! 239:
! 240: /*
! 241: * Curl_auth_cleanup_spnego()
! 242: *
! 243: * This is used to clean up the SPNEGO (Negotiate) specific data.
! 244: *
! 245: * Parameters:
! 246: *
! 247: * nego [in/out] - The Negotiate data struct being cleaned up.
! 248: *
! 249: */
! 250: void Curl_auth_cleanup_spnego(struct negotiatedata *nego)
! 251: {
! 252: OM_uint32 minor_status;
! 253:
! 254: /* Free our security context */
! 255: if(nego->context != GSS_C_NO_CONTEXT) {
! 256: gss_delete_sec_context(&minor_status, &nego->context, GSS_C_NO_BUFFER);
! 257: nego->context = GSS_C_NO_CONTEXT;
! 258: }
! 259:
! 260: /* Free the output token */
! 261: if(nego->output_token.value) {
! 262: gss_release_buffer(&minor_status, &nego->output_token);
! 263: nego->output_token.value = NULL;
! 264: nego->output_token.length = 0;
! 265:
! 266: }
! 267:
! 268: /* Free the SPN */
! 269: if(nego->spn != GSS_C_NO_NAME) {
! 270: gss_release_name(&minor_status, &nego->spn);
! 271: nego->spn = GSS_C_NO_NAME;
! 272: }
! 273:
! 274: /* Reset any variables */
! 275: nego->status = 0;
! 276: nego->noauthpersist = FALSE;
! 277: nego->havenoauthpersist = FALSE;
! 278: nego->havenegdata = FALSE;
! 279: nego->havemultiplerequests = FALSE;
! 280: }
! 281:
! 282: #endif /* HAVE_GSSAPI && USE_SPNEGO */
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