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annotate src/c/openid.c @ 40:5415f1ded564

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Tell libcurl to use SSLv3
author Adam Chlipala <adam@chlipala.net>
date Sun, 12 Jun 2011 17:16:30 -0400
parents 8d23d76b5d48
children a77f4cd1336d
rev   line source
adam@14 1 #include <ctype.h>
adam@1 2 #include <string.h>
adam@1 3
adam@6 4 #include <openssl/bio.h>
adam@6 5 #include <openssl/evp.h>
adam@6 6 #include <openssl/buffer.h>
adam@0 7 #include <openssl/sha.h>
adam@7 8 #include <openssl/hmac.h>
adam@8 9 #include <openssl/dh.h>
adam@0 10 #include <curl/curl.h>
adam@1 11 #include <expat.h>
adam@0 12
adam@26 13 #include <pthread.h>
adam@26 14
adam@1 15 #include <openid.h>
adam@0 16
adam@3 17 #define BUF_MAX 10240
adam@3 18 #define BUF_INIT 1024
adam@3 19
adam@26 20 #define DEFAULT_PRIME "DCF93A0B883972EC0E19989AC5A2CE310E1D37717E8D9571BB7623731866E61EF75A2E27898B057F9891C2E27A639C3F29B60814581CD3B2CA3986D2683705577D45C2E7E52DC81C7A171876E5CEA74B1448BFDFAF18828EFD2519F14E45E3826634AF1949E5B535CC829A483B8A76223E5D490A257F05BDFF16F2FB22C583AB"
adam@26 21 #define DEFAULT_GENERATOR "2"
adam@26 22
adam@26 23 static BIGNUM *default_prime, *default_generator;
adam@2 24
adam@2 25 uw_Basis_string uw_OpenidFfi_endpoint(uw_context ctx, uw_OpenidFfi_discovery d) {
adam@8 26 return d.endpoint;
adam@2 27 }
adam@2 28
adam@2 29 uw_Basis_string uw_OpenidFfi_localId(uw_context ctx, uw_OpenidFfi_discovery d) {
adam@8 30 return d.localId;
adam@2 31 }
adam@2 32
adam@26 33 static pthread_mutex_t *locks;
adam@26 34
adam@26 35 static void locking_function(int mode, int n, const char *file, int line) {
adam@26 36 if (mode & CRYPTO_LOCK)
adam@26 37 pthread_mutex_lock(&locks[n]);
adam@26 38 else
adam@26 39 pthread_mutex_unlock(&locks[n]);
adam@26 40 }
adam@26 41
adam@0 42 uw_unit uw_OpenidFfi_init(uw_context ctx) {
adam@26 43 int nl = CRYPTO_num_locks(), i;
adam@26 44 locks = malloc(sizeof(pthread_mutex_t) * nl);
adam@26 45 for (i = 0; i < nl; ++i)
adam@26 46 pthread_mutex_init(&locks[i], NULL);
adam@26 47
adam@26 48 CRYPTO_set_locking_callback(locking_function);
adam@0 49 curl_global_init(CURL_GLOBAL_ALL);
adam@0 50
adam@26 51 BN_hex2bn(&default_prime, DEFAULT_PRIME);
adam@26 52 BN_dec2bn(&default_generator, DEFAULT_GENERATOR);
adam@26 53
adam@0 54 return uw_unit_v;
adam@0 55 }
adam@1 56
adam@1 57 static CURL *curl(uw_context ctx) {
adam@1 58 CURL *r;
adam@1 59
adam@1 60 if (!(r = uw_get_global(ctx, "curl"))) {
adam@1 61 r = curl_easy_init();
adam@1 62 if (r)
adam@1 63 uw_set_global(ctx, "curl", r, curl_easy_cleanup);
adam@1 64 }
adam@1 65
adam@1 66 return r;
adam@1 67 }
adam@1 68
adam@26 69 typedef enum { NONE, SERVICE, TYPE, MATCHED, URI } xrds_mode;
adam@26 70
adam@1 71 typedef struct {
adam@1 72 uw_context ctx;
adam@8 73 uw_OpenidFfi_discovery *d;
adam@26 74 xrds_mode mode;
adam@27 75 int cur_priority, max_priority;
adam@1 76 } endpoint;
adam@1 77
adam@1 78 static void XMLCALL startElement(void *userData, const XML_Char *name, const XML_Char **atts) {
adam@1 79 endpoint *ep = userData;
adam@1 80
adam@26 81 if (!strncmp(name, "xrd:", 4))
adam@26 82 name += 4;
adam@26 83
adam@1 84 if (!strcmp(name, "link")) {
adam@1 85 const XML_Char **attp;
adam@1 86 int found = 0;
adam@1 87
adam@1 88 for (attp = atts; *attp; attp += 2) {
adam@1 89 if (!strcmp(attp[0], "rel") && !strcmp(attp[1], "openid2.provider")) {
adam@1 90 found = 1;
adam@1 91 break;
adam@1 92 }
adam@1 93 }
adam@1 94
adam@1 95 if (found) {
adam@1 96 for (attp = atts; *attp; attp += 2) {
adam@1 97 if (!strcmp(attp[0], "href")) {
adam@2 98 ep->d->endpoint = uw_strdup(ep->ctx, attp[1]);
adam@1 99 return;
adam@1 100 }
adam@1 101 }
adam@1 102 }
adam@1 103 }
adam@27 104 else if (!strcmp(name, "Service")) {
adam@27 105 const XML_Char **attp;
adam@27 106
adam@27 107 ep->cur_priority = 0;
adam@27 108 for (attp = atts; *attp; attp += 2)
adam@27 109 if (!strcmp(attp[0], "priority")) {
adam@27 110 ep->cur_priority = atoi(attp[1]);
adam@27 111 break;
adam@27 112 }
adam@27 113
adam@26 114 ep->mode = SERVICE;
adam@27 115 } else if (!strcmp(name, "Type")) {
adam@26 116 if (ep->mode == SERVICE)
adam@26 117 ep->mode = TYPE;
adam@26 118 }
adam@26 119 else if (!strcmp(name, "URI")) {
adam@26 120 if (ep->mode == MATCHED)
adam@26 121 ep->mode = URI;
adam@26 122 }
adam@26 123 }
adam@26 124
adam@26 125 static char server[] = "http://specs.openid.net/auth/2.0/server";
adam@26 126 static char signon[] = "http://specs.openid.net/auth/2.0/signon";
adam@26 127
adam@26 128 static void XMLCALL cdata(void *userData, const XML_Char *s, int len) {
adam@26 129 endpoint *ep = userData;
adam@26 130
adam@26 131 switch (ep->mode) {
adam@26 132 case TYPE:
adam@26 133 if ((len == sizeof(server)-1 && !memcmp(server, s, sizeof(server)-1))
adam@26 134 || (len == sizeof(signon)-1 && !memcmp(signon, s, sizeof(signon)-1)))
adam@26 135 ep->mode = MATCHED;
adam@26 136 break;
adam@26 137 case URI:
adam@27 138 if (ep->cur_priority < ep->max_priority) {
adam@27 139 ep->d->endpoint = uw_malloc(ep->ctx, len+1);
adam@27 140 memcpy(ep->d->endpoint, s, len);
adam@27 141 ep->d->endpoint[len] = 0;
adam@27 142 ep->max_priority = ep->cur_priority;
adam@27 143 }
adam@26 144 break;
adam@26 145 default:
adam@26 146 break;
adam@26 147 }
adam@26 148 }
adam@26 149
adam@26 150 static void XMLCALL endElement(void *userData, const XML_Char *name) {
adam@26 151 endpoint *ep = userData;
adam@26 152
adam@26 153 if (!strncmp(name, "xrd:", 4))
adam@26 154 name += 4;
adam@26 155
adam@26 156 if (!strcmp(name, "Service"))
adam@26 157 ep->mode = NONE;
adam@26 158 else if (!strcmp(name, "Type")) {
adam@26 159 if (ep->mode != MATCHED)
adam@26 160 ep->mode = SERVICE;
adam@26 161 }
adam@26 162 else if (!strcmp(name, "URI"))
adam@26 163 ep->mode = MATCHED;
adam@1 164 }
adam@1 165
adam@1 166 typedef struct {
adam@1 167 XML_Parser parser;
adam@1 168 int any_errors;
adam@3 169 } curl_discovery_data;
adam@1 170
adam@3 171 static size_t write_discovery_data(void *buffer, size_t size, size_t nmemb, void *userp) {
adam@3 172 curl_discovery_data *d = userp;
adam@1 173
adam@1 174 if (!XML_Parse(d->parser, buffer, size * nmemb, 0))
adam@1 175 d->any_errors = 1;
adam@1 176
adam@1 177 return size * nmemb;
adam@1 178 }
adam@1 179
adam@2 180 uw_OpenidFfi_discovery *uw_OpenidFfi_discover(uw_context ctx, uw_Basis_string id) {
adam@1 181 char *s;
adam@1 182 CURL *c = curl(ctx);
adam@3 183 curl_discovery_data cd = {};
adam@8 184 uw_OpenidFfi_discovery *dy = uw_malloc(ctx, sizeof(uw_OpenidFfi_discovery));
adam@27 185 endpoint ep = {ctx, dy, NONE, 0, INT_MAX};
adam@1 186 CURLcode code;
adam@27 187 struct curl_slist *headers = NULL;
adam@1 188
adam@2 189 dy->endpoint = dy->localId = NULL;
adam@2 190
adam@1 191 if (!strchr(id, ':')) {
adam@1 192 id = uw_Basis_strcat(ctx, "http://", id);
adam@1 193 if ((s = strchr(id, '#')) != NULL)
adam@1 194 *s = 0;
adam@1 195 } else if ((s = strchr(id, '#')) != NULL) {
adam@1 196 char *id2 = uw_malloc(ctx, s - id + 1);
adam@1 197 memcpy(id2, s, s - id);
adam@1 198 id2[s - id] = 0;
adam@1 199 id = id2;
adam@1 200 }
adam@1 201
adam@1 202 cd.parser = XML_ParserCreate(NULL);
adam@1 203 XML_SetUserData(cd.parser, &ep);
adam@1 204 uw_push_cleanup(ctx, (void (*)(void *))XML_ParserFree, cd.parser);
adam@26 205 XML_SetElementHandler(cd.parser, startElement, endElement);
adam@26 206 XML_SetCharacterDataHandler(cd.parser, cdata);
adam@1 207
adam@26 208 curl_easy_reset(c);
adam@40 209 curl_easy_setopt(c, CURLOPT_SSLVERSION, CURL_SSLVERSION_SSLv3);
adam@1 210 curl_easy_setopt(c, CURLOPT_URL, id);
adam@3 211 curl_easy_setopt(c, CURLOPT_WRITEFUNCTION, write_discovery_data);
adam@1 212 curl_easy_setopt(c, CURLOPT_WRITEDATA, &cd);
adam@27 213 curl_slist_append(headers, "Accept: application/xrds+xml");
adam@27 214 uw_push_cleanup(ctx, (void (*)(void *))curl_slist_free_all, headers);
adam@27 215 curl_easy_setopt(c, CURLOPT_HTTPHEADER, headers);
adam@1 216
adam@1 217 code = curl_easy_perform(c);
adam@1 218 uw_pop_cleanup(ctx);
adam@27 219 uw_pop_cleanup(ctx);
adam@1 220
adam@40 221 if (code) {
adam@40 222 uw_Basis_debug(ctx, "CURL error:");
adam@40 223 uw_Basis_debug(ctx, (char*)curl_easy_strerror(code));
adam@40 224 }
adam@40 225 else if (!dy->endpoint)
adam@40 226 uw_Basis_debug(ctx, "Couldn't parse endpoint from page");
adam@40 227
adam@8 228 if (code || !dy->endpoint)
adam@1 229 return NULL;
adam@8 230 else
adam@8 231 return dy;
adam@1 232 }
adam@3 233
adam@3 234 uw_OpenidFfi_inputs uw_OpenidFfi_createInputs(uw_context ctx) {
adam@3 235 uw_buffer *r = uw_malloc(ctx, sizeof(uw_buffer));
adam@3 236 uw_buffer_init(BUF_MAX, r, BUF_INIT);
adam@3 237 return r;
adam@3 238 }
adam@3 239
adam@8 240 static void postify(uw_OpenidFfi_inputs buf, uw_Basis_string s) {
adam@14 241 char hex[4];
adam@14 242
adam@8 243 for (; *s; ++s) {
adam@14 244 if (isalnum(*s))
adam@14 245 uw_buffer_append(buf, s, 1);
adam@14 246 else {
adam@14 247 sprintf(hex, "%%%02X", (unsigned char)*s);
adam@14 248 uw_buffer_append(buf, hex, 3);
adam@14 249 }
adam@8 250 }
adam@3 251 }
adam@3 252
adam@3 253 uw_unit uw_OpenidFfi_addInput(uw_context ctx, uw_OpenidFfi_inputs buf, uw_Basis_string key, uw_Basis_string value) {
adam@3 254 if (uw_buffer_used(buf) > 0)
adam@3 255 uw_buffer_append(buf, "&", 1);
adam@3 256
adam@14 257 uw_buffer_append(buf, key, strlen(key));
adam@3 258 uw_buffer_append(buf, "=", 1);
adam@8 259 postify(buf, value);
adam@3 260
adam@3 261 return uw_unit_v;
adam@3 262 }
adam@3 263
adam@3 264 uw_Basis_string uw_OpenidFfi_getOutput(uw_context ctx, uw_OpenidFfi_outputs buf, uw_Basis_string key) {
adam@3 265 char *s = buf->start;
adam@3 266
adam@3 267 for (; *s; s = strchr(strchr(s, 0)+1, 0)+1)
adam@3 268 if (!strcmp(key, s))
adam@3 269 return strchr(s, 0)+1;
adam@3 270
adam@3 271 return NULL;
adam@3 272 }
adam@3 273
adam@27 274 uw_unit uw_OpenidFfi_printOutputs(uw_context ctx, uw_OpenidFfi_outputs buf) {
adam@27 275 char *s = buf->start;
adam@27 276
adam@27 277 for (; *s; s = strchr(strchr(s, 0)+1, 0)+1)
adam@27 278 fprintf(stderr, "%s => %s\n", s, strchr(s, 0)+1);
adam@27 279
adam@27 280 return uw_unit_v;
adam@27 281 }
adam@27 282
adam@3 283 static size_t write_buffer_data(void *buffer, size_t size, size_t nmemb, void *userp) {
adam@3 284 uw_buffer *buf = userp;
adam@3 285
adam@3 286 uw_buffer_append(buf, buffer, size * nmemb);
adam@3 287
adam@3 288 return size * nmemb;
adam@3 289 }
adam@3 290
adam@3 291 const char curl_failure[] = "error\0Error fetching URL";
adam@3 292
adam@4 293 uw_OpenidFfi_outputs uw_OpenidFfi_direct(uw_context ctx, uw_Basis_string url, uw_OpenidFfi_inputs inps) {
adam@3 294 uw_buffer *buf = uw_malloc(ctx, sizeof(uw_buffer));
adam@3 295 CURL *c = curl(ctx);
adam@3 296 CURLcode code;
adam@3 297
adam@3 298 uw_buffer_init(BUF_MAX, buf, BUF_INIT);
adam@3 299
adam@3 300 uw_buffer_append(inps, "", 1);
adam@3 301
adam@26 302 curl_easy_reset(c);
adam@40 303 curl_easy_setopt(c, CURLOPT_SSLVERSION, CURL_SSLVERSION_SSLv3);
adam@3 304 curl_easy_setopt(c, CURLOPT_URL, url);
adam@3 305 curl_easy_setopt(c, CURLOPT_POSTFIELDS, inps->start);
adam@3 306 curl_easy_setopt(c, CURLOPT_WRITEFUNCTION, write_buffer_data);
adam@3 307 curl_easy_setopt(c, CURLOPT_WRITEDATA, buf);
adam@3 308
adam@3 309 code = curl_easy_perform(c);
adam@3 310 uw_buffer_append(buf, "", 1);
adam@3 311
adam@3 312 if (code) {
adam@3 313 uw_buffer_reset(buf);
adam@3 314 uw_buffer_append(buf, curl_failure, sizeof curl_failure);
adam@3 315 } else {
adam@3 316 char *s;
adam@3 317
adam@3 318 s = buf->start;
adam@3 319 while (*s) {
adam@3 320 char *colon = strchr(s, ':'), *newline;
adam@3 321
adam@3 322 if (!colon) {
adam@3 323 *s = 0;
adam@3 324 break;
adam@3 325 }
adam@3 326
adam@7 327 *colon = 0;
adam@7 328
adam@3 329 newline = strchr(colon+1, '\n');
adam@3 330
adam@7 331 if (!newline)
adam@3 332 break;
adam@3 333
adam@3 334 *newline = 0;
adam@3 335 s = newline+1;
adam@3 336 }
adam@3 337 }
adam@3 338
adam@3 339 return buf;
adam@3 340 }
adam@4 341
adam@4 342 static uw_Basis_string deurl(uw_context ctx, uw_Basis_string s) {
adam@4 343 uw_Basis_string r = uw_malloc(ctx, strlen(s)), s2 = r;
adam@4 344
adam@4 345 for (; *s; ++s) {
adam@4 346 if (s[0] == '%' && s[1] && s[2]) {
adam@4 347 unsigned u;
adam@4 348
adam@4 349 sscanf(s+1, "%02x", &u);
adam@4 350 *s2++ = u;
adam@4 351 s += 2;
adam@4 352 } else
adam@4 353 *s2++ = *s;
adam@4 354 }
adam@4 355
adam@4 356 *s2 = 0;
adam@4 357 return r;
adam@4 358 }
adam@4 359
adam@4 360 uw_OpenidFfi_outputs uw_OpenidFfi_indirect(uw_context ctx, uw_Basis_string fields) {
adam@4 361 uw_OpenidFfi_outputs b = malloc(sizeof(uw_buffer));
adam@4 362
adam@4 363 uw_buffer_init(BUF_MAX, b, BUF_INIT);
adam@4 364
adam@6 365 fields = uw_strdup(ctx, fields);
adam@6 366
adam@4 367 while (*fields) {
adam@4 368 char *equal = strchr(fields, '='), *and, *s;
adam@4 369
adam@4 370 if (!equal)
adam@4 371 break;
adam@4 372
adam@4 373 *equal = 0;
adam@4 374 s = deurl(ctx, fields);
adam@4 375 uw_buffer_append(b, s, strlen(s));
adam@4 376 uw_buffer_append(b, "", 1);
adam@4 377
adam@4 378 and = strchr(equal+1, '&');
adam@4 379 if (and) {
adam@4 380 *and = 0;
adam@4 381 fields = and+1;
adam@4 382 } else
adam@4 383 fields = and = strchr(equal+1, 0);
adam@4 384 s = deurl(ctx, equal+1);
adam@4 385 uw_buffer_append(b, s, strlen(s));
adam@4 386 uw_buffer_append(b, "", 1);
adam@4 387 }
adam@4 388
adam@4 389 uw_buffer_append(b, "", 1);
adam@4 390 return b;
adam@4 391 }
adam@6 392
adam@6 393 static uw_Basis_string base64(uw_context ctx, unsigned char *input, int length) {
adam@6 394 BIO *bmem, *b64;
adam@6 395
adam@6 396 b64 = BIO_new(BIO_f_base64());
adam@7 397 BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
adam@6 398 bmem = BIO_new(BIO_s_mem());
adam@7 399 BIO_push(b64, bmem);
adam@6 400 BIO_write(b64, input, length);
adam@6 401 (void)BIO_flush(b64);
adam@6 402
adam@7 403 int len = BIO_ctrl_pending(bmem);
adam@7 404 char *buff = uw_malloc(ctx, len+1);
adam@7 405 BIO_read(bmem, buff, len);
adam@7 406 buff[len] = 0;
adam@6 407
adam@6 408 BIO_free_all(b64);
adam@6 409
adam@6 410 return buff;
adam@6 411 }
adam@6 412
adam@8 413 static int unbase64(unsigned char *input, int length, unsigned char *buffer, int bufferLength)
adam@7 414 {
adam@7 415 BIO *b64, *bmem;
adam@8 416 int n;
adam@6 417
adam@7 418 b64 = BIO_new(BIO_f_base64());
adam@7 419 BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
adam@7 420 bmem = BIO_new_mem_buf(input, length);
adam@7 421 BIO_push(b64, bmem);
adam@8 422 n = BIO_read(b64, buffer, bufferLength);
adam@6 423
adam@7 424 BIO_free_all(bmem);
adam@8 425
adam@8 426 return n;
adam@8 427 }
adam@8 428
adam@12 429 uw_Basis_string uw_OpenidFfi_hmac_sha1(uw_context ctx, uw_Basis_string key, uw_Basis_string data) {
adam@8 430 unsigned char keyBin[SHA_DIGEST_LENGTH], out[EVP_MAX_MD_SIZE];
adam@8 431 unsigned outLen;
adam@8 432
adam@8 433 unbase64((unsigned char *)key, strlen(key), keyBin, sizeof keyBin);
adam@8 434
adam@8 435 HMAC(EVP_sha1(), keyBin, sizeof keyBin, (unsigned char *)data, strlen(data), out, &outLen);
adam@8 436 return base64(ctx, out, outLen);
adam@6 437 }
adam@7 438
adam@12 439 uw_Basis_string uw_OpenidFfi_hmac_sha256(uw_context ctx, uw_Basis_string key, uw_Basis_string data) {
adam@7 440 unsigned char keyBin[SHA256_DIGEST_LENGTH], out[EVP_MAX_MD_SIZE];
adam@7 441 unsigned outLen;
adam@7 442
adam@7 443 unbase64((unsigned char *)key, strlen(key), keyBin, sizeof keyBin);
adam@7 444
adam@7 445 HMAC(EVP_sha256(), keyBin, sizeof keyBin, (unsigned char *)data, strlen(data), out, &outLen);
adam@7 446 return base64(ctx, out, outLen);
adam@7 447 }
adam@8 448
adam@8 449 static uw_Basis_string btwoc(uw_context ctx, const BIGNUM *n) {
adam@8 450 int len = BN_num_bytes(n), i;
adam@8 451 unsigned char bytes[len+1];
adam@8 452
adam@8 453 bytes[0] = 0;
adam@8 454 BN_bn2bin(n, bytes+1);
adam@8 455
adam@8 456 for (i = 1; i <= len; ++i)
adam@8 457 if (bytes[i]) {
adam@8 458 if (bytes[i] & 0x80)
adam@8 459 --i;
adam@8 460 break;
adam@8 461 }
adam@8 462
adam@8 463 if (i > len)
adam@8 464 i = len;
adam@8 465
adam@8 466 return base64(ctx, bytes+i, len+1-i);
adam@8 467 }
adam@8 468
adam@8 469 static BIGNUM *unbtwoc(uw_context ctx, uw_Basis_string s) {
adam@8 470 unsigned char bytes[1024];
adam@8 471 int len;
adam@8 472
adam@8 473 len = unbase64((unsigned char *)s, strlen(s), bytes, sizeof bytes);
adam@8 474 return BN_bin2bn(bytes, len, NULL);
adam@8 475 }
adam@8 476
adam@8 477 uw_Basis_string uw_OpenidFfi_modulus(uw_context ctx, uw_OpenidFfi_dh dh) {
adam@8 478 return btwoc(ctx, dh->p);
adam@8 479 }
adam@8 480
adam@8 481 uw_Basis_string uw_OpenidFfi_generator(uw_context ctx, uw_OpenidFfi_dh dh) {
adam@8 482 return btwoc(ctx, dh->g);
adam@8 483 }
adam@8 484
adam@8 485 uw_Basis_string uw_OpenidFfi_public(uw_context ctx, uw_OpenidFfi_dh dh) {
adam@8 486 return btwoc(ctx, dh->pub_key);
adam@8 487 }
adam@8 488
adam@8 489 static void free_DH(void *data, int will_retry) {
adam@8 490 DH *dh = data;
adam@26 491 dh->p = NULL;
adam@26 492 dh->g = NULL;
adam@8 493 DH_free(dh);
adam@8 494 }
adam@8 495
adam@8 496 uw_OpenidFfi_dh uw_OpenidFfi_generate(uw_context ctx) {
adam@8 497 DH *dh = DH_new();
adam@8 498
adam@26 499 dh->p = default_prime;
adam@26 500 dh->g = default_generator;
adam@8 501 uw_register_transactional(ctx, dh, NULL, NULL, free_DH);
adam@8 502
adam@8 503 if (DH_generate_key(dh) != 1)
adam@8 504 uw_error(ctx, FATAL, "Diffie-Hellman key generation failed");
adam@8 505
adam@8 506 return dh;
adam@8 507 }
adam@8 508
adam@8 509 uw_Basis_string uw_OpenidFfi_compute(uw_context ctx, uw_OpenidFfi_dh dh, uw_Basis_string server_pub) {
adam@8 510 BIGNUM *bn = unbtwoc(ctx, server_pub);
adam@12 511 unsigned char secret[DH_size(dh)+1], *secretP;
adam@8 512 int size;
adam@8 513
adam@8 514 uw_push_cleanup(ctx, (void (*)(void *))BN_free, bn);
adam@8 515
adam@12 516 size = DH_compute_key(secret+1, bn, dh);
adam@8 517 if (size == -1)
adam@8 518 uw_error(ctx, FATAL, "Diffie-Hellman key computation failed");
adam@8 519
adam@8 520 uw_pop_cleanup(ctx);
adam@8 521
adam@12 522 if (size > 0 && (secret[1] & 0x80)) {
adam@12 523 secret[0] = 0;
adam@12 524 secretP = secret;
adam@12 525 ++size;
adam@12 526 } else
adam@12 527 secretP = secret+1;
adam@12 528
adam@12 529 return base64(ctx, secretP, size);
adam@8 530 }
adam@12 531
adam@12 532 uw_Basis_string uw_OpenidFfi_sha1(uw_context ctx, uw_Basis_string data) {
adam@12 533 unsigned char dataBin[128], out[EVP_MAX_MD_SIZE];
adam@12 534 int len;
adam@12 535
adam@12 536 len = unbase64((unsigned char *)data, strlen(data), dataBin, sizeof dataBin);
adam@12 537
adam@12 538 SHA1(dataBin, len, out);
adam@12 539 return base64(ctx, out, SHA_DIGEST_LENGTH);
adam@12 540 }
adam@12 541
adam@12 542 uw_Basis_string uw_OpenidFfi_sha256(uw_context ctx, uw_Basis_string data) {
adam@12 543 unsigned char dataBin[128], out[EVP_MAX_MD_SIZE];
adam@12 544 int len;
adam@12 545
adam@12 546 len = unbase64((unsigned char *)data, strlen(data), dataBin, sizeof dataBin);
adam@12 547
adam@12 548 SHA256(dataBin, len, out);
adam@12 549 return base64(ctx, out, SHA256_DIGEST_LENGTH);
adam@12 550 }
adam@12 551
adam@12 552 uw_Basis_string uw_OpenidFfi_xor(uw_context ctx, uw_Basis_string s1, uw_Basis_string s2) {
adam@12 553 unsigned char buf1[128], buf2[128], bufO[128];
adam@12 554 int len1, len2, i;
adam@12 555
adam@12 556 len1 = unbase64((unsigned char *)s1, strlen(s1), buf1, sizeof buf1);
adam@12 557 len2 = unbase64((unsigned char *)s2, strlen(s2), buf2, sizeof buf2);
adam@12 558
adam@12 559 for (i = 0; i < len1; ++i)
adam@12 560 bufO[i] = buf1[i] ^ buf2[i % len2];
adam@12 561
adam@12 562 return base64(ctx, bufO, len1);
adam@12 563 }
adam@13 564
adam@13 565 uw_OpenidFfi_inputs uw_OpenidFfi_remode(uw_context ctx, uw_OpenidFfi_outputs out, uw_Basis_string mode) {
adam@13 566 uw_OpenidFfi_inputs in = uw_OpenidFfi_createInputs(ctx);
adam@13 567 char *s;
adam@13 568
adam@13 569 for (s = out->start; *s; s = strchr(strchr(s, 0)+1, 0)+1)
adam@13 570 if (!strcmp("openid.mode", s))
adam@13 571 uw_OpenidFfi_addInput(ctx, in, "openid.mode", mode);
adam@13 572 else
adam@13 573 uw_OpenidFfi_addInput(ctx, in, s, strchr(s, 0)+1);
adam@13 574
adam@13 575 return in;
adam@13 576 }