1 /* 2 * Copyright 2001-2023 The OpenSSL Project Authors. All Rights Reserved. 3 * Copyright Siemens AG 2018-2020 4 * 5 * Licensed under the Apache License 2.0 (the "License"). You may not use 6 * this file except in compliance with the License. You can obtain a copy 7 * in the file LICENSE in the source distribution or at 8 * https://www.openssl.org/source/license.html 9 */ 10 11 #include "e_os.h" 12 #include <stdio.h> 13 #include <stdlib.h> 14 #include "crypto/ctype.h" 15 #include <string.h> 16 #include <openssl/asn1.h> 17 #include <openssl/evp.h> 18 #include <openssl/err.h> 19 #include <openssl/httperr.h> 20 #include <openssl/cmperr.h> 21 #include <openssl/buffer.h> 22 #include <openssl/http.h> 23 #include "internal/sockets.h" 24 #include "internal/cryptlib.h" /* for ossl_assert() */ 25 26 #define HAS_PREFIX(str, prefix) (strncmp(str, prefix, sizeof(prefix) - 1) == 0) 27 #define HTTP_PREFIX "HTTP/" 28 #define HTTP_VERSION_PATT "1." /* allow 1.x */ 29 #define HTTP_VERSION_STR_LEN sizeof(HTTP_VERSION_PATT) /* == strlen("1.0") */ 30 #define HTTP_PREFIX_VERSION HTTP_PREFIX""HTTP_VERSION_PATT 31 #define HTTP_1_0 HTTP_PREFIX_VERSION"0" /* "HTTP/1.0" */ 32 #define HTTP_LINE1_MINLEN (sizeof(HTTP_PREFIX_VERSION "x 200\n") - 1) 33 #define HTTP_VERSION_MAX_REDIRECTIONS 50 34 35 #define HTTP_STATUS_CODE_OK 200 36 #define HTTP_STATUS_CODE_MOVED_PERMANENTLY 301 37 #define HTTP_STATUS_CODE_FOUND 302 38 39 /* Stateful HTTP request code, supporting blocking and non-blocking I/O */ 40 41 /* Opaque HTTP request status structure */ 42 43 struct ossl_http_req_ctx_st { 44 int state; /* Current I/O state */ 45 unsigned char *buf; /* Buffer to write request or read response */ 46 int buf_size; /* Buffer size */ 47 int free_wbio; /* wbio allocated internally, free with ctx */ 48 BIO *wbio; /* BIO to write/send request to */ 49 BIO *rbio; /* BIO to read/receive response from */ 50 OSSL_HTTP_bio_cb_t upd_fn; /* Optional BIO update callback used for TLS */ 51 void *upd_arg; /* Optional arg for update callback function */ 52 int use_ssl; /* Use HTTPS */ 53 char *proxy; /* Optional proxy name or URI */ 54 char *server; /* Optional server host name */ 55 char *port; /* Optional server port */ 56 BIO *mem; /* Mem BIO holding request header or response */ 57 BIO *req; /* BIO holding the request provided by caller */ 58 int method_POST; /* HTTP method is POST (else GET) */ 59 char *expected_ct; /* Optional expected Content-Type */ 60 int expect_asn1; /* Response must be ASN.1-encoded */ 61 unsigned char *pos; /* Current position sending data */ 62 long len_to_send; /* Number of bytes still to send */ 63 size_t resp_len; /* Length of response */ 64 size_t max_resp_len; /* Maximum length of response, or 0 */ 65 int keep_alive; /* Persistent conn. 0=no, 1=prefer, 2=require */ 66 time_t max_time; /* Maximum end time of current transfer, or 0 */ 67 time_t max_total_time; /* Maximum end time of total transfer, or 0 */ 68 char *redirection_url; /* Location obtained from HTTP status 301/302 */ 69 }; 70 71 /* HTTP states */ 72 73 #define OHS_NOREAD 0x1000 /* If set no reading should be performed */ 74 #define OHS_ERROR (0 | OHS_NOREAD) /* Error condition */ 75 #define OHS_ADD_HEADERS (1 | OHS_NOREAD) /* Adding header lines to request */ 76 #define OHS_WRITE_INIT (2 | OHS_NOREAD) /* 1st call: ready to start send */ 77 #define OHS_WRITE_HDR (3 | OHS_NOREAD) /* Request header being sent */ 78 #define OHS_WRITE_REQ (4 | OHS_NOREAD) /* Request contents being sent */ 79 #define OHS_FLUSH (5 | OHS_NOREAD) /* Request being flushed */ 80 #define OHS_FIRSTLINE 1 /* First line of response being read */ 81 #define OHS_HEADERS 2 /* MIME headers of response being read */ 82 #define OHS_REDIRECT 3 /* MIME headers being read, expecting Location */ 83 #define OHS_ASN1_HEADER 4 /* ASN1 sequence header (tag+length) being read */ 84 #define OHS_ASN1_CONTENT 5 /* ASN1 content octets being read */ 85 #define OHS_ASN1_DONE (6 | OHS_NOREAD) /* ASN1 content read completed */ 86 #define OHS_STREAM (7 | OHS_NOREAD) /* HTTP content stream to be read */ 87 88 /* Low-level HTTP API implementation */ 89 90 OSSL_HTTP_REQ_CTX *OSSL_HTTP_REQ_CTX_new(BIO *wbio, BIO *rbio, int buf_size) 91 { 92 OSSL_HTTP_REQ_CTX *rctx; 93 94 if (wbio == NULL || rbio == NULL) { 95 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); 96 return NULL; 97 } 98 99 if ((rctx = OPENSSL_zalloc(sizeof(*rctx))) == NULL) 100 return NULL; 101 rctx->state = OHS_ERROR; 102 rctx->buf_size = buf_size > 0 ? buf_size : OSSL_HTTP_DEFAULT_MAX_LINE_LEN; 103 rctx->buf = OPENSSL_malloc(rctx->buf_size); 104 rctx->wbio = wbio; 105 rctx->rbio = rbio; 106 if (rctx->buf == NULL) { 107 OPENSSL_free(rctx); 108 return NULL; 109 } 110 rctx->max_resp_len = OSSL_HTTP_DEFAULT_MAX_RESP_LEN; 111 /* everything else is 0, e.g. rctx->len_to_send, or NULL, e.g. rctx->mem */ 112 return rctx; 113 } 114 115 void OSSL_HTTP_REQ_CTX_free(OSSL_HTTP_REQ_CTX *rctx) 116 { 117 if (rctx == NULL) 118 return; 119 /* 120 * Use BIO_free_all() because bio_update_fn may prepend or append to cbio. 121 * This also frees any (e.g., SSL/TLS) BIOs linked with bio and, 122 * like BIO_reset(bio), calls SSL_shutdown() to notify/alert the peer. 123 */ 124 if (rctx->free_wbio) 125 BIO_free_all(rctx->wbio); 126 /* do not free rctx->rbio */ 127 BIO_free(rctx->mem); 128 BIO_free(rctx->req); 129 OPENSSL_free(rctx->buf); 130 OPENSSL_free(rctx->proxy); 131 OPENSSL_free(rctx->server); 132 OPENSSL_free(rctx->port); 133 OPENSSL_free(rctx->expected_ct); 134 OPENSSL_free(rctx); 135 } 136 137 BIO *OSSL_HTTP_REQ_CTX_get0_mem_bio(const OSSL_HTTP_REQ_CTX *rctx) 138 { 139 if (rctx == NULL) { 140 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); 141 return NULL; 142 } 143 return rctx->mem; 144 } 145 146 size_t OSSL_HTTP_REQ_CTX_get_resp_len(const OSSL_HTTP_REQ_CTX *rctx) 147 { 148 if (rctx == NULL) { 149 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); 150 return 0; 151 } 152 return rctx->resp_len; 153 } 154 155 void OSSL_HTTP_REQ_CTX_set_max_response_length(OSSL_HTTP_REQ_CTX *rctx, 156 unsigned long len) 157 { 158 if (rctx == NULL) { 159 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); 160 return; 161 } 162 rctx->max_resp_len = len != 0 ? (size_t)len : OSSL_HTTP_DEFAULT_MAX_RESP_LEN; 163 } 164 165 /* 166 * Create request line using |rctx| and |path| (or "/" in case |path| is NULL). 167 * Server name (and optional port) must be given if and only if 168 * a plain HTTP proxy is used and |path| does not begin with 'http://'. 169 */ 170 int OSSL_HTTP_REQ_CTX_set_request_line(OSSL_HTTP_REQ_CTX *rctx, int method_POST, 171 const char *server, const char *port, 172 const char *path) 173 { 174 if (rctx == NULL) { 175 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); 176 return 0; 177 } 178 BIO_free(rctx->mem); 179 if ((rctx->mem = BIO_new(BIO_s_mem())) == NULL) 180 return 0; 181 182 rctx->method_POST = method_POST != 0; 183 if (BIO_printf(rctx->mem, "%s ", rctx->method_POST ? "POST" : "GET") <= 0) 184 return 0; 185 186 if (server != NULL) { /* HTTP (but not HTTPS) proxy is used */ 187 /* 188 * Section 5.1.2 of RFC 1945 states that the absoluteURI form is only 189 * allowed when using a proxy 190 */ 191 if (BIO_printf(rctx->mem, OSSL_HTTP_PREFIX"%s", server) <= 0) 192 return 0; 193 if (port != NULL && BIO_printf(rctx->mem, ":%s", port) <= 0) 194 return 0; 195 } 196 197 /* Make sure path includes a forward slash (abs_path) */ 198 if (path == NULL) { 199 path = "/"; 200 } else if (HAS_PREFIX(path, "http://")) { /* absoluteURI for proxy use */ 201 if (server != NULL) { 202 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_INVALID_ARGUMENT); 203 return 0; 204 } 205 } else if (path[0] != '/' && BIO_printf(rctx->mem, "/") <= 0) { 206 return 0; 207 } 208 /* 209 * Add (the rest of) the path and the HTTP version, 210 * which is fixed to 1.0 for straightforward implementation of keep-alive 211 */ 212 if (BIO_printf(rctx->mem, "%s "HTTP_1_0"\r\n", path) <= 0) 213 return 0; 214 215 rctx->resp_len = 0; 216 rctx->state = OHS_ADD_HEADERS; 217 return 1; 218 } 219 220 int OSSL_HTTP_REQ_CTX_add1_header(OSSL_HTTP_REQ_CTX *rctx, 221 const char *name, const char *value) 222 { 223 if (rctx == NULL || name == NULL) { 224 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); 225 return 0; 226 } 227 if (rctx->mem == NULL) { 228 ERR_raise(ERR_LIB_HTTP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 229 return 0; 230 } 231 232 if (BIO_puts(rctx->mem, name) <= 0) 233 return 0; 234 if (value != NULL) { 235 if (BIO_write(rctx->mem, ": ", 2) != 2) 236 return 0; 237 if (BIO_puts(rctx->mem, value) <= 0) 238 return 0; 239 } 240 return BIO_write(rctx->mem, "\r\n", 2) == 2; 241 } 242 243 int OSSL_HTTP_REQ_CTX_set_expected(OSSL_HTTP_REQ_CTX *rctx, 244 const char *content_type, int asn1, 245 int timeout, int keep_alive) 246 { 247 if (rctx == NULL) { 248 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); 249 return 0; 250 } 251 if (keep_alive != 0 252 && rctx->state != OHS_ERROR && rctx->state != OHS_ADD_HEADERS) { 253 /* Cannot anymore set keep-alive in request header */ 254 ERR_raise(ERR_LIB_HTTP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 255 return 0; 256 } 257 258 OPENSSL_free(rctx->expected_ct); 259 rctx->expected_ct = NULL; 260 if (content_type != NULL 261 && (rctx->expected_ct = OPENSSL_strdup(content_type)) == NULL) 262 return 0; 263 264 rctx->expect_asn1 = asn1; 265 if (timeout >= 0) 266 rctx->max_time = timeout > 0 ? time(NULL) + timeout : 0; 267 else /* take over any |overall_timeout| arg of OSSL_HTTP_open(), else 0 */ 268 rctx->max_time = rctx->max_total_time; 269 rctx->keep_alive = keep_alive; 270 return 1; 271 } 272 273 static int set1_content(OSSL_HTTP_REQ_CTX *rctx, 274 const char *content_type, BIO *req) 275 { 276 long req_len = 0; 277 #ifndef OPENSSL_NO_STDIO 278 FILE *fp = NULL; 279 #endif 280 281 if (rctx == NULL || (req == NULL && content_type != NULL)) { 282 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); 283 return 0; 284 } 285 286 if (rctx->keep_alive != 0 287 && !OSSL_HTTP_REQ_CTX_add1_header(rctx, "Connection", "keep-alive")) 288 return 0; 289 290 BIO_free(rctx->req); 291 rctx->req = NULL; 292 if (req == NULL) 293 return 1; 294 if (!rctx->method_POST) { 295 ERR_raise(ERR_LIB_HTTP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 296 return 0; 297 } 298 299 if (content_type != NULL 300 && BIO_printf(rctx->mem, "Content-Type: %s\r\n", content_type) <= 0) 301 return 0; 302 303 /* 304 * BIO_CTRL_INFO yields the data length at least for memory BIOs, but for 305 * file-based BIOs it gives the current position, which is not what we need. 306 */ 307 if (BIO_method_type(req) == BIO_TYPE_FILE) { 308 #ifndef OPENSSL_NO_STDIO 309 if (BIO_get_fp(req, &fp) == 1 && fseek(fp, 0, SEEK_END) == 0) { 310 req_len = ftell(fp); 311 (void)fseek(fp, 0, SEEK_SET); 312 } else { 313 fp = NULL; 314 } 315 #endif 316 } else { 317 req_len = BIO_ctrl(req, BIO_CTRL_INFO, 0, NULL); 318 /* 319 * Streaming BIOs likely will not support querying the size at all, 320 * and we assume we got a correct value if req_len > 0. 321 */ 322 } 323 if (( 324 #ifndef OPENSSL_NO_STDIO 325 fp != NULL /* definitely correct req_len */ || 326 #endif 327 req_len > 0) 328 && BIO_printf(rctx->mem, "Content-Length: %ld\r\n", req_len) < 0) 329 return 0; 330 331 if (!BIO_up_ref(req)) 332 return 0; 333 rctx->req = req; 334 return 1; 335 } 336 337 int OSSL_HTTP_REQ_CTX_set1_req(OSSL_HTTP_REQ_CTX *rctx, const char *content_type, 338 const ASN1_ITEM *it, const ASN1_VALUE *req) 339 { 340 BIO *mem = NULL; 341 int res = 1; 342 343 if (req != NULL) 344 res = (mem = ASN1_item_i2d_mem_bio(it, req)) != NULL; 345 res = res && set1_content(rctx, content_type, mem); 346 BIO_free(mem); 347 return res; 348 } 349 350 static int add1_headers(OSSL_HTTP_REQ_CTX *rctx, 351 const STACK_OF(CONF_VALUE) *headers, const char *host) 352 { 353 int i; 354 int add_host = host != NULL && *host != '\0'; 355 CONF_VALUE *hdr; 356 357 for (i = 0; i < sk_CONF_VALUE_num(headers); i++) { 358 hdr = sk_CONF_VALUE_value(headers, i); 359 if (add_host && OPENSSL_strcasecmp("host", hdr->name) == 0) 360 add_host = 0; 361 if (!OSSL_HTTP_REQ_CTX_add1_header(rctx, hdr->name, hdr->value)) 362 return 0; 363 } 364 365 if (add_host && !OSSL_HTTP_REQ_CTX_add1_header(rctx, "Host", host)) 366 return 0; 367 return 1; 368 } 369 370 /* Create OSSL_HTTP_REQ_CTX structure using the values provided. */ 371 static OSSL_HTTP_REQ_CTX *http_req_ctx_new(int free_wbio, BIO *wbio, BIO *rbio, 372 OSSL_HTTP_bio_cb_t bio_update_fn, 373 void *arg, int use_ssl, 374 const char *proxy, 375 const char *server, const char *port, 376 int buf_size, int overall_timeout) 377 { 378 OSSL_HTTP_REQ_CTX *rctx = OSSL_HTTP_REQ_CTX_new(wbio, rbio, buf_size); 379 380 if (rctx == NULL) 381 return NULL; 382 rctx->free_wbio = free_wbio; 383 rctx->upd_fn = bio_update_fn; 384 rctx->upd_arg = arg; 385 rctx->use_ssl = use_ssl; 386 if (proxy != NULL 387 && (rctx->proxy = OPENSSL_strdup(proxy)) == NULL) 388 goto err; 389 if (server != NULL 390 && (rctx->server = OPENSSL_strdup(server)) == NULL) 391 goto err; 392 if (port != NULL 393 && (rctx->port = OPENSSL_strdup(port)) == NULL) 394 goto err; 395 rctx->max_total_time = 396 overall_timeout > 0 ? time(NULL) + overall_timeout : 0; 397 return rctx; 398 399 err: 400 OSSL_HTTP_REQ_CTX_free(rctx); 401 return NULL; 402 } 403 404 /* 405 * Parse first HTTP response line. This should be like this: "HTTP/1.0 200 OK". 406 * We need to obtain the status code and (optional) informational message. 407 * Return any received HTTP response status code, or 0 on fatal error. 408 */ 409 410 static int parse_http_line1(char *line, int *found_keep_alive) 411 { 412 int i, retcode, err; 413 char *code, *reason, *end; 414 415 if (!HAS_PREFIX(line, HTTP_PREFIX_VERSION)) 416 goto err; 417 /* above HTTP 1.0, connection persistence is the default */ 418 *found_keep_alive = line[strlen(HTTP_PREFIX_VERSION)] > '0'; 419 420 /* Skip to first whitespace (past protocol info) */ 421 for (code = line; *code != '\0' && !ossl_isspace(*code); code++) 422 continue; 423 if (*code == '\0') 424 goto err; 425 426 /* Skip past whitespace to start of response code */ 427 while (*code != '\0' && ossl_isspace(*code)) 428 code++; 429 if (*code == '\0') 430 goto err; 431 432 /* Find end of response code: first whitespace after start of code */ 433 for (reason = code; *reason != '\0' && !ossl_isspace(*reason); reason++) 434 continue; 435 436 if (*reason == '\0') 437 goto err; 438 439 /* Set end of response code and start of message */ 440 *reason++ = '\0'; 441 442 /* Attempt to parse numeric code */ 443 retcode = strtoul(code, &end, 10); 444 if (*end != '\0') 445 goto err; 446 447 /* Skip over any leading whitespace in message */ 448 while (*reason != '\0' && ossl_isspace(*reason)) 449 reason++; 450 451 if (*reason != '\0') { 452 /* 453 * Finally zap any trailing whitespace in message (include CRLF) 454 */ 455 456 /* chop any trailing whitespace from reason */ 457 /* We know reason has a non-whitespace character so this is OK */ 458 for (end = reason + strlen(reason) - 1; ossl_isspace(*end); end--) 459 *end = '\0'; 460 } 461 462 switch (retcode) { 463 case HTTP_STATUS_CODE_OK: 464 case HTTP_STATUS_CODE_MOVED_PERMANENTLY: 465 case HTTP_STATUS_CODE_FOUND: 466 return retcode; 467 default: 468 err = HTTP_R_RECEIVED_ERROR; 469 if (retcode < 400) 470 err = HTTP_R_STATUS_CODE_UNSUPPORTED; 471 if (*reason == '\0') 472 ERR_raise_data(ERR_LIB_HTTP, err, "code=%s", code); 473 else 474 ERR_raise_data(ERR_LIB_HTTP, err, "code=%s, reason=%s", code, 475 reason); 476 return retcode; 477 } 478 479 err: 480 for (i = 0; i < 60 && line[i] != '\0'; i++) 481 if (!ossl_isprint(line[i])) 482 line[i] = ' '; 483 line[i] = '\0'; 484 ERR_raise_data(ERR_LIB_HTTP, HTTP_R_HEADER_PARSE_ERROR, "content=%s", line); 485 return 0; 486 } 487 488 static int check_set_resp_len(OSSL_HTTP_REQ_CTX *rctx, size_t len) 489 { 490 if (rctx->max_resp_len != 0 && len > rctx->max_resp_len) 491 ERR_raise_data(ERR_LIB_HTTP, HTTP_R_MAX_RESP_LEN_EXCEEDED, 492 "length=%zu, max=%zu", len, rctx->max_resp_len); 493 if (rctx->resp_len != 0 && rctx->resp_len != len) 494 ERR_raise_data(ERR_LIB_HTTP, HTTP_R_INCONSISTENT_CONTENT_LENGTH, 495 "ASN.1 length=%zu, Content-Length=%zu", 496 len, rctx->resp_len); 497 rctx->resp_len = len; 498 return 1; 499 } 500 501 static int may_still_retry(time_t max_time, int *ptimeout) 502 { 503 time_t time_diff, now = time(NULL); 504 505 if (max_time != 0) { 506 if (max_time < now) { 507 ERR_raise(ERR_LIB_HTTP, HTTP_R_RETRY_TIMEOUT); 508 return 0; 509 } 510 time_diff = max_time - now; 511 *ptimeout = time_diff > INT_MAX ? INT_MAX : (int)time_diff; 512 } 513 return 1; 514 } 515 516 /* 517 * Try exchanging request and response via HTTP on (non-)blocking BIO in rctx. 518 * Returns 1 on success, 0 on error or redirection, -1 on BIO_should_retry. 519 */ 520 int OSSL_HTTP_REQ_CTX_nbio(OSSL_HTTP_REQ_CTX *rctx) 521 { 522 int i, found_expected_ct = 0, found_keep_alive = 0; 523 long n; 524 size_t resp_len; 525 const unsigned char *p; 526 char *buf, *key, *value, *line_end = NULL; 527 528 if (rctx == NULL) { 529 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); 530 return 0; 531 } 532 if (rctx->mem == NULL || rctx->wbio == NULL || rctx->rbio == NULL) { 533 ERR_raise(ERR_LIB_HTTP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 534 return 0; 535 } 536 537 rctx->redirection_url = NULL; 538 next_io: 539 buf = (char *)rctx->buf; 540 if ((rctx->state & OHS_NOREAD) == 0) { 541 if (rctx->expect_asn1) { 542 n = BIO_read(rctx->rbio, rctx->buf, rctx->buf_size); 543 } else { 544 (void)ERR_set_mark(); 545 n = BIO_gets(rctx->rbio, buf, rctx->buf_size); 546 if (n == -2) { /* unsupported method */ 547 (void)ERR_pop_to_mark(); 548 n = BIO_get_line(rctx->rbio, buf, rctx->buf_size); 549 } else { 550 (void)ERR_clear_last_mark(); 551 } 552 } 553 if (n <= 0) { 554 if (BIO_should_retry(rctx->rbio)) 555 return -1; 556 ERR_raise(ERR_LIB_HTTP, HTTP_R_FAILED_READING_DATA); 557 return 0; 558 } 559 560 /* Write data to memory BIO */ 561 if (BIO_write(rctx->mem, rctx->buf, n) != n) 562 return 0; 563 } 564 565 switch (rctx->state) { 566 case OHS_ADD_HEADERS: 567 /* Last operation was adding headers: need a final \r\n */ 568 if (BIO_write(rctx->mem, "\r\n", 2) != 2) { 569 rctx->state = OHS_ERROR; 570 return 0; 571 } 572 rctx->state = OHS_WRITE_INIT; 573 574 /* fall thru */ 575 case OHS_WRITE_INIT: 576 rctx->len_to_send = BIO_get_mem_data(rctx->mem, &rctx->pos); 577 rctx->state = OHS_WRITE_HDR; 578 579 /* fall thru */ 580 case OHS_WRITE_HDR: 581 /* Copy some chunk of data from rctx->mem to rctx->wbio */ 582 case OHS_WRITE_REQ: 583 /* Copy some chunk of data from rctx->req to rctx->wbio */ 584 585 if (rctx->len_to_send > 0) { 586 i = BIO_write(rctx->wbio, rctx->pos, rctx->len_to_send); 587 if (i <= 0) { 588 if (BIO_should_retry(rctx->wbio)) 589 return -1; 590 rctx->state = OHS_ERROR; 591 return 0; 592 } 593 rctx->pos += i; 594 rctx->len_to_send -= i; 595 goto next_io; 596 } 597 if (rctx->state == OHS_WRITE_HDR) { 598 (void)BIO_reset(rctx->mem); 599 rctx->state = OHS_WRITE_REQ; 600 } 601 if (rctx->req != NULL && !BIO_eof(rctx->req)) { 602 n = BIO_read(rctx->req, rctx->buf, rctx->buf_size); 603 if (n <= 0) { 604 if (BIO_should_retry(rctx->req)) 605 return -1; 606 ERR_raise(ERR_LIB_HTTP, HTTP_R_FAILED_READING_DATA); 607 return 0; 608 } 609 rctx->pos = rctx->buf; 610 rctx->len_to_send = n; 611 goto next_io; 612 } 613 rctx->state = OHS_FLUSH; 614 615 /* fall thru */ 616 case OHS_FLUSH: 617 618 i = BIO_flush(rctx->wbio); 619 620 if (i > 0) { 621 rctx->state = OHS_FIRSTLINE; 622 goto next_io; 623 } 624 625 if (BIO_should_retry(rctx->wbio)) 626 return -1; 627 628 rctx->state = OHS_ERROR; 629 return 0; 630 631 case OHS_ERROR: 632 return 0; 633 634 case OHS_FIRSTLINE: 635 case OHS_HEADERS: 636 case OHS_REDIRECT: 637 638 /* Attempt to read a line in */ 639 next_line: 640 /* 641 * Due to strange memory BIO behavior with BIO_gets we have to check 642 * there's a complete line in there before calling BIO_gets or we'll 643 * just get a partial read. 644 */ 645 n = BIO_get_mem_data(rctx->mem, &p); 646 if (n <= 0 || memchr(p, '\n', n) == 0) { 647 if (n >= rctx->buf_size) { 648 rctx->state = OHS_ERROR; 649 return 0; 650 } 651 goto next_io; 652 } 653 n = BIO_gets(rctx->mem, buf, rctx->buf_size); 654 655 if (n <= 0) { 656 if (BIO_should_retry(rctx->mem)) 657 goto next_io; 658 rctx->state = OHS_ERROR; 659 return 0; 660 } 661 662 /* Don't allow excessive lines */ 663 if (n == rctx->buf_size) { 664 ERR_raise(ERR_LIB_HTTP, HTTP_R_RESPONSE_LINE_TOO_LONG); 665 rctx->state = OHS_ERROR; 666 return 0; 667 } 668 669 /* First line */ 670 if (rctx->state == OHS_FIRSTLINE) { 671 switch (parse_http_line1(buf, &found_keep_alive)) { 672 case HTTP_STATUS_CODE_OK: 673 rctx->state = OHS_HEADERS; 674 goto next_line; 675 case HTTP_STATUS_CODE_MOVED_PERMANENTLY: 676 case HTTP_STATUS_CODE_FOUND: /* i.e., moved temporarily */ 677 if (!rctx->method_POST) { /* method is GET */ 678 rctx->state = OHS_REDIRECT; 679 goto next_line; 680 } 681 ERR_raise(ERR_LIB_HTTP, HTTP_R_REDIRECTION_NOT_ENABLED); 682 /* redirection is not supported/recommended for POST */ 683 /* fall through */ 684 default: 685 rctx->state = OHS_ERROR; 686 goto next_line; 687 } 688 } 689 key = buf; 690 value = strchr(key, ':'); 691 if (value != NULL) { 692 *(value++) = '\0'; 693 while (ossl_isspace(*value)) 694 value++; 695 line_end = strchr(value, '\r'); 696 if (line_end == NULL) 697 line_end = strchr(value, '\n'); 698 if (line_end != NULL) 699 *line_end = '\0'; 700 } 701 if (value != NULL && line_end != NULL) { 702 if (rctx->state == OHS_REDIRECT 703 && OPENSSL_strcasecmp(key, "Location") == 0) { 704 rctx->redirection_url = value; 705 return 0; 706 } 707 if (rctx->state == OHS_HEADERS && rctx->expected_ct != NULL 708 && OPENSSL_strcasecmp(key, "Content-Type") == 0) { 709 if (OPENSSL_strcasecmp(rctx->expected_ct, value) != 0) { 710 ERR_raise_data(ERR_LIB_HTTP, HTTP_R_UNEXPECTED_CONTENT_TYPE, 711 "expected=%s, actual=%s", 712 rctx->expected_ct, value); 713 return 0; 714 } 715 found_expected_ct = 1; 716 } 717 718 /* https://tools.ietf.org/html/rfc7230#section-6.3 Persistence */ 719 if (OPENSSL_strcasecmp(key, "Connection") == 0) { 720 if (OPENSSL_strcasecmp(value, "keep-alive") == 0) 721 found_keep_alive = 1; 722 else if (OPENSSL_strcasecmp(value, "close") == 0) 723 found_keep_alive = 0; 724 } else if (OPENSSL_strcasecmp(key, "Content-Length") == 0) { 725 resp_len = (size_t)strtoul(value, &line_end, 10); 726 if (line_end == value || *line_end != '\0') { 727 ERR_raise_data(ERR_LIB_HTTP, 728 HTTP_R_ERROR_PARSING_CONTENT_LENGTH, 729 "input=%s", value); 730 return 0; 731 } 732 if (!check_set_resp_len(rctx, resp_len)) 733 return 0; 734 } 735 } 736 737 /* Look for blank line indicating end of headers */ 738 for (p = rctx->buf; *p != '\0'; p++) { 739 if (*p != '\r' && *p != '\n') 740 break; 741 } 742 if (*p != '\0') /* not end of headers */ 743 goto next_line; 744 745 if (rctx->keep_alive != 0 /* do not let server initiate keep_alive */ 746 && !found_keep_alive /* otherwise there is no change */) { 747 if (rctx->keep_alive == 2) { 748 rctx->keep_alive = 0; 749 ERR_raise(ERR_LIB_HTTP, HTTP_R_SERVER_CANCELED_CONNECTION); 750 return 0; 751 } 752 rctx->keep_alive = 0; 753 } 754 755 if (rctx->state == OHS_ERROR) 756 return 0; 757 758 if (rctx->expected_ct != NULL && !found_expected_ct) { 759 ERR_raise_data(ERR_LIB_HTTP, HTTP_R_MISSING_CONTENT_TYPE, 760 "expected=%s", rctx->expected_ct); 761 return 0; 762 } 763 if (rctx->state == OHS_REDIRECT) { 764 /* http status code indicated redirect but there was no Location */ 765 ERR_raise(ERR_LIB_HTTP, HTTP_R_MISSING_REDIRECT_LOCATION); 766 return 0; 767 } 768 769 if (!rctx->expect_asn1) { 770 rctx->state = OHS_STREAM; 771 return 1; 772 } 773 774 rctx->state = OHS_ASN1_HEADER; 775 776 /* Fall thru */ 777 case OHS_ASN1_HEADER: 778 /* 779 * Now reading ASN1 header: can read at least 2 bytes which is enough 780 * for ASN1 SEQUENCE header and either length field or at least the 781 * length of the length field. 782 */ 783 n = BIO_get_mem_data(rctx->mem, &p); 784 if (n < 2) 785 goto next_io; 786 787 /* Check it is an ASN1 SEQUENCE */ 788 if (*p++ != (V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED)) { 789 ERR_raise(ERR_LIB_HTTP, HTTP_R_MISSING_ASN1_ENCODING); 790 return 0; 791 } 792 793 /* Check out length field */ 794 if ((*p & 0x80) != 0) { 795 /* 796 * If MSB set on initial length octet we can now always read 6 797 * octets: make sure we have them. 798 */ 799 if (n < 6) 800 goto next_io; 801 n = *p & 0x7F; 802 /* Not NDEF or excessive length */ 803 if (n == 0 || (n > 4)) { 804 ERR_raise(ERR_LIB_HTTP, HTTP_R_ERROR_PARSING_ASN1_LENGTH); 805 return 0; 806 } 807 p++; 808 resp_len = 0; 809 for (i = 0; i < n; i++) { 810 resp_len <<= 8; 811 resp_len |= *p++; 812 } 813 resp_len += n + 2; 814 } else { 815 resp_len = *p + 2; 816 } 817 if (!check_set_resp_len(rctx, resp_len)) 818 return 0; 819 820 rctx->state = OHS_ASN1_CONTENT; 821 822 /* Fall thru */ 823 case OHS_ASN1_CONTENT: 824 default: 825 n = BIO_get_mem_data(rctx->mem, NULL); 826 if (n < 0 || (size_t)n < rctx->resp_len) 827 goto next_io; 828 829 rctx->state = OHS_ASN1_DONE; 830 return 1; 831 } 832 } 833 834 int OSSL_HTTP_REQ_CTX_nbio_d2i(OSSL_HTTP_REQ_CTX *rctx, 835 ASN1_VALUE **pval, const ASN1_ITEM *it) 836 { 837 const unsigned char *p; 838 int rv; 839 840 *pval = NULL; 841 if ((rv = OSSL_HTTP_REQ_CTX_nbio(rctx)) != 1) 842 return rv; 843 *pval = ASN1_item_d2i(NULL, &p, BIO_get_mem_data(rctx->mem, &p), it); 844 return *pval != NULL; 845 846 } 847 848 #ifndef OPENSSL_NO_SOCK 849 850 /* set up a new connection BIO, to HTTP server or to HTTP(S) proxy if given */ 851 static BIO *http_new_bio(const char *server /* optionally includes ":port" */, 852 const char *server_port /* explicit server port */, 853 int use_ssl, 854 const char *proxy /* optionally includes ":port" */, 855 const char *proxy_port /* explicit proxy port */) 856 { 857 const char *host = server; 858 const char *port = server_port; 859 BIO *cbio; 860 861 if (!ossl_assert(server != NULL)) 862 return NULL; 863 864 if (proxy != NULL) { 865 host = proxy; 866 port = proxy_port; 867 } 868 869 if (port == NULL && strchr(host, ':') == NULL) 870 port = use_ssl ? OSSL_HTTPS_PORT : OSSL_HTTP_PORT; 871 872 cbio = BIO_new_connect(host /* optionally includes ":port" */); 873 if (cbio == NULL) 874 goto end; 875 if (port != NULL) 876 (void)BIO_set_conn_port(cbio, port); 877 878 end: 879 return cbio; 880 } 881 #endif /* OPENSSL_NO_SOCK */ 882 883 /* Exchange request and response via HTTP on (non-)blocking BIO */ 884 BIO *OSSL_HTTP_REQ_CTX_exchange(OSSL_HTTP_REQ_CTX *rctx) 885 { 886 int rv; 887 888 if (rctx == NULL) { 889 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); 890 return NULL; 891 } 892 893 for (;;) { 894 rv = OSSL_HTTP_REQ_CTX_nbio(rctx); 895 if (rv != -1) 896 break; 897 /* BIO_should_retry was true */ 898 /* will not actually wait if rctx->max_time == 0 */ 899 if (BIO_wait(rctx->rbio, rctx->max_time, 100 /* milliseconds */) <= 0) 900 return NULL; 901 } 902 903 if (rv == 0) { 904 if (rctx->redirection_url == NULL) { /* an error occurred */ 905 if (rctx->len_to_send > 0) 906 ERR_raise(ERR_LIB_HTTP, HTTP_R_ERROR_SENDING); 907 else 908 ERR_raise(ERR_LIB_HTTP, HTTP_R_ERROR_RECEIVING); 909 } 910 return NULL; 911 } 912 return rctx->state == OHS_STREAM ? rctx->rbio : rctx->mem; 913 } 914 915 int OSSL_HTTP_is_alive(const OSSL_HTTP_REQ_CTX *rctx) 916 { 917 return rctx != NULL && rctx->keep_alive != 0; 918 } 919 920 /* High-level HTTP API implementation */ 921 922 /* Initiate an HTTP session using bio, else use given server, proxy, etc. */ 923 OSSL_HTTP_REQ_CTX *OSSL_HTTP_open(const char *server, const char *port, 924 const char *proxy, const char *no_proxy, 925 int use_ssl, BIO *bio, BIO *rbio, 926 OSSL_HTTP_bio_cb_t bio_update_fn, void *arg, 927 int buf_size, int overall_timeout) 928 { 929 BIO *cbio; /* == bio if supplied, used as connection BIO if rbio is NULL */ 930 OSSL_HTTP_REQ_CTX *rctx = NULL; 931 932 if (use_ssl && bio_update_fn == NULL) { 933 ERR_raise(ERR_LIB_HTTP, HTTP_R_TLS_NOT_ENABLED); 934 return NULL; 935 } 936 if (rbio != NULL && (bio == NULL || bio_update_fn != NULL)) { 937 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_INVALID_ARGUMENT); 938 return NULL; 939 } 940 941 if (bio != NULL) { 942 cbio = bio; 943 if (proxy != NULL || no_proxy != NULL) { 944 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_INVALID_ARGUMENT); 945 return NULL; 946 } 947 } else { 948 #ifndef OPENSSL_NO_SOCK 949 char *proxy_host = NULL, *proxy_port = NULL; 950 951 if (server == NULL) { 952 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); 953 return NULL; 954 } 955 if (port != NULL && *port == '\0') 956 port = NULL; 957 if (port == NULL && strchr(server, ':') == NULL) 958 port = use_ssl ? OSSL_HTTPS_PORT : OSSL_HTTP_PORT; 959 proxy = OSSL_HTTP_adapt_proxy(proxy, no_proxy, server, use_ssl); 960 if (proxy != NULL 961 && !OSSL_HTTP_parse_url(proxy, NULL /* use_ssl */, NULL /* user */, 962 &proxy_host, &proxy_port, NULL /* num */, 963 NULL /* path */, NULL, NULL)) 964 return NULL; 965 cbio = http_new_bio(server, port, use_ssl, proxy_host, proxy_port); 966 OPENSSL_free(proxy_host); 967 OPENSSL_free(proxy_port); 968 if (cbio == NULL) 969 return NULL; 970 #else 971 ERR_raise(ERR_LIB_HTTP, HTTP_R_SOCK_NOT_SUPPORTED); 972 return NULL; 973 #endif 974 } 975 976 (void)ERR_set_mark(); /* prepare removing any spurious libssl errors */ 977 if (rbio == NULL && BIO_do_connect_retry(cbio, overall_timeout, -1) <= 0) { 978 if (bio == NULL) /* cbio was not provided by caller */ 979 BIO_free_all(cbio); 980 goto end; 981 } 982 /* now overall_timeout is guaranteed to be >= 0 */ 983 984 /* adapt in order to fix callback design flaw, see #17088 */ 985 /* callback can be used to wrap or prepend TLS session */ 986 if (bio_update_fn != NULL) { 987 BIO *orig_bio = cbio; 988 989 cbio = (*bio_update_fn)(cbio, arg, 1 /* connect */, use_ssl != 0); 990 if (cbio == NULL) { 991 if (bio == NULL) /* cbio was not provided by caller */ 992 BIO_free_all(orig_bio); 993 goto end; 994 } 995 } 996 997 rctx = http_req_ctx_new(bio == NULL, cbio, rbio != NULL ? rbio : cbio, 998 bio_update_fn, arg, use_ssl, proxy, server, port, 999 buf_size, overall_timeout); 1000 1001 end: 1002 if (rctx != NULL) 1003 /* remove any spurious error queue entries by ssl_add_cert_chain() */ 1004 (void)ERR_pop_to_mark(); 1005 else 1006 (void)ERR_clear_last_mark(); 1007 1008 return rctx; 1009 } 1010 1011 int OSSL_HTTP_set1_request(OSSL_HTTP_REQ_CTX *rctx, const char *path, 1012 const STACK_OF(CONF_VALUE) *headers, 1013 const char *content_type, BIO *req, 1014 const char *expected_content_type, int expect_asn1, 1015 size_t max_resp_len, int timeout, int keep_alive) 1016 { 1017 int use_http_proxy; 1018 1019 if (rctx == NULL) { 1020 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); 1021 return 0; 1022 } 1023 use_http_proxy = rctx->proxy != NULL && !rctx->use_ssl; 1024 if (use_http_proxy && rctx->server == NULL) { 1025 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_INVALID_ARGUMENT); 1026 return 0; 1027 } 1028 rctx->max_resp_len = max_resp_len; /* allows for 0: indefinite */ 1029 1030 return OSSL_HTTP_REQ_CTX_set_request_line(rctx, req != NULL, 1031 use_http_proxy ? rctx->server 1032 : NULL, rctx->port, path) 1033 && add1_headers(rctx, headers, rctx->server) 1034 && OSSL_HTTP_REQ_CTX_set_expected(rctx, expected_content_type, 1035 expect_asn1, timeout, keep_alive) 1036 && set1_content(rctx, content_type, req); 1037 } 1038 1039 /*- 1040 * Exchange single HTTP request and response according to rctx. 1041 * If rctx->method_POST then use POST, else use GET and ignore content_type. 1042 * The redirection_url output (freed by caller) parameter is used only for GET. 1043 */ 1044 BIO *OSSL_HTTP_exchange(OSSL_HTTP_REQ_CTX *rctx, char **redirection_url) 1045 { 1046 BIO *resp; 1047 1048 if (rctx == NULL) { 1049 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); 1050 return NULL; 1051 } 1052 1053 if (redirection_url != NULL) 1054 *redirection_url = NULL; /* do this beforehand to prevent dbl free */ 1055 1056 resp = OSSL_HTTP_REQ_CTX_exchange(rctx); 1057 if (resp == NULL) { 1058 if (rctx->redirection_url != NULL) { 1059 if (redirection_url == NULL) 1060 ERR_raise(ERR_LIB_HTTP, HTTP_R_REDIRECTION_NOT_ENABLED); 1061 else 1062 /* may be NULL if out of memory: */ 1063 *redirection_url = OPENSSL_strdup(rctx->redirection_url); 1064 } else { 1065 char buf[200]; 1066 unsigned long err = ERR_peek_error(); 1067 int lib = ERR_GET_LIB(err); 1068 int reason = ERR_GET_REASON(err); 1069 1070 if (lib == ERR_LIB_SSL || lib == ERR_LIB_HTTP 1071 || (lib == ERR_LIB_BIO && reason == BIO_R_CONNECT_TIMEOUT) 1072 || (lib == ERR_LIB_BIO && reason == BIO_R_CONNECT_ERROR) 1073 #ifndef OPENSSL_NO_CMP 1074 || (lib == ERR_LIB_CMP 1075 && reason == CMP_R_POTENTIALLY_INVALID_CERTIFICATE) 1076 #endif 1077 ) { 1078 if (rctx->server != NULL) { 1079 BIO_snprintf(buf, sizeof(buf), "server=http%s://%s%s%s", 1080 rctx->use_ssl ? "s" : "", rctx->server, 1081 rctx->port != NULL ? ":" : "", 1082 rctx->port != NULL ? rctx->port : ""); 1083 ERR_add_error_data(1, buf); 1084 } 1085 if (rctx->proxy != NULL) 1086 ERR_add_error_data(2, " proxy=", rctx->proxy); 1087 if (err == 0) { 1088 BIO_snprintf(buf, sizeof(buf), " peer has disconnected%s", 1089 rctx->use_ssl ? " violating the protocol" : 1090 ", likely because it requires the use of TLS"); 1091 ERR_add_error_data(1, buf); 1092 } 1093 } 1094 } 1095 } 1096 1097 if (resp != NULL && !BIO_up_ref(resp)) 1098 resp = NULL; 1099 return resp; 1100 } 1101 1102 static int redirection_ok(int n_redir, const char *old_url, const char *new_url) 1103 { 1104 if (n_redir >= HTTP_VERSION_MAX_REDIRECTIONS) { 1105 ERR_raise(ERR_LIB_HTTP, HTTP_R_TOO_MANY_REDIRECTIONS); 1106 return 0; 1107 } 1108 if (*new_url == '/') /* redirection to same server => same protocol */ 1109 return 1; 1110 if (HAS_PREFIX(old_url, OSSL_HTTPS_NAME":") && 1111 !HAS_PREFIX(new_url, OSSL_HTTPS_NAME":")) { 1112 ERR_raise(ERR_LIB_HTTP, HTTP_R_REDIRECTION_FROM_HTTPS_TO_HTTP); 1113 return 0; 1114 } 1115 return 1; 1116 } 1117 1118 /* Get data via HTTP from server at given URL, potentially with redirection */ 1119 BIO *OSSL_HTTP_get(const char *url, const char *proxy, const char *no_proxy, 1120 BIO *bio, BIO *rbio, 1121 OSSL_HTTP_bio_cb_t bio_update_fn, void *arg, 1122 int buf_size, const STACK_OF(CONF_VALUE) *headers, 1123 const char *expected_ct, int expect_asn1, 1124 size_t max_resp_len, int timeout) 1125 { 1126 char *current_url, *redirection_url = NULL; 1127 int n_redirs = 0; 1128 char *host; 1129 char *port; 1130 char *path; 1131 int use_ssl; 1132 OSSL_HTTP_REQ_CTX *rctx = NULL; 1133 BIO *resp = NULL; 1134 time_t max_time = timeout > 0 ? time(NULL) + timeout : 0; 1135 1136 if (url == NULL) { 1137 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); 1138 return NULL; 1139 } 1140 if ((current_url = OPENSSL_strdup(url)) == NULL) 1141 return NULL; 1142 1143 for (;;) { 1144 if (!OSSL_HTTP_parse_url(current_url, &use_ssl, NULL /* user */, &host, 1145 &port, NULL /* port_num */, &path, NULL, NULL)) 1146 break; 1147 1148 rctx = OSSL_HTTP_open(host, port, proxy, no_proxy, 1149 use_ssl, bio, rbio, bio_update_fn, arg, 1150 buf_size, timeout); 1151 new_rpath: 1152 if (rctx != NULL) { 1153 if (!OSSL_HTTP_set1_request(rctx, path, headers, 1154 NULL /* content_type */, 1155 NULL /* req */, 1156 expected_ct, expect_asn1, max_resp_len, 1157 -1 /* use same max time (timeout) */, 1158 0 /* no keep_alive */)) { 1159 OSSL_HTTP_REQ_CTX_free(rctx); 1160 rctx = NULL; 1161 } else { 1162 resp = OSSL_HTTP_exchange(rctx, &redirection_url); 1163 } 1164 } 1165 OPENSSL_free(path); 1166 if (resp == NULL && redirection_url != NULL) { 1167 if (redirection_ok(++n_redirs, current_url, redirection_url) 1168 && may_still_retry(max_time, &timeout)) { 1169 (void)BIO_reset(bio); 1170 OPENSSL_free(current_url); 1171 current_url = redirection_url; 1172 if (*redirection_url == '/') { /* redirection to same server */ 1173 path = OPENSSL_strdup(redirection_url); 1174 if (path == NULL) { 1175 OPENSSL_free(host); 1176 OPENSSL_free(port); 1177 (void)OSSL_HTTP_close(rctx, 1); 1178 rctx = NULL; 1179 BIO_free(resp); 1180 OPENSSL_free(current_url); 1181 return NULL; 1182 } 1183 goto new_rpath; 1184 } 1185 OPENSSL_free(host); 1186 OPENSSL_free(port); 1187 (void)OSSL_HTTP_close(rctx, 1); 1188 rctx = NULL; 1189 continue; 1190 } 1191 /* if redirection not allowed, ignore it */ 1192 OPENSSL_free(redirection_url); 1193 } 1194 OPENSSL_free(host); 1195 OPENSSL_free(port); 1196 if (!OSSL_HTTP_close(rctx, resp != NULL)) { 1197 BIO_free(resp); 1198 rctx = NULL; 1199 resp = NULL; 1200 } 1201 break; 1202 } 1203 OPENSSL_free(current_url); 1204 return resp; 1205 } 1206 1207 /* Exchange request and response over a connection managed via |prctx| */ 1208 BIO *OSSL_HTTP_transfer(OSSL_HTTP_REQ_CTX **prctx, 1209 const char *server, const char *port, 1210 const char *path, int use_ssl, 1211 const char *proxy, const char *no_proxy, 1212 BIO *bio, BIO *rbio, 1213 OSSL_HTTP_bio_cb_t bio_update_fn, void *arg, 1214 int buf_size, const STACK_OF(CONF_VALUE) *headers, 1215 const char *content_type, BIO *req, 1216 const char *expected_ct, int expect_asn1, 1217 size_t max_resp_len, int timeout, int keep_alive) 1218 { 1219 OSSL_HTTP_REQ_CTX *rctx = prctx == NULL ? NULL : *prctx; 1220 BIO *resp = NULL; 1221 1222 if (rctx == NULL) { 1223 rctx = OSSL_HTTP_open(server, port, proxy, no_proxy, 1224 use_ssl, bio, rbio, bio_update_fn, arg, 1225 buf_size, timeout); 1226 timeout = -1; /* Already set during opening the connection */ 1227 } 1228 if (rctx != NULL) { 1229 if (OSSL_HTTP_set1_request(rctx, path, headers, content_type, req, 1230 expected_ct, expect_asn1, 1231 max_resp_len, timeout, keep_alive)) 1232 resp = OSSL_HTTP_exchange(rctx, NULL); 1233 if (resp == NULL || !OSSL_HTTP_is_alive(rctx)) { 1234 if (!OSSL_HTTP_close(rctx, resp != NULL)) { 1235 BIO_free(resp); 1236 resp = NULL; 1237 } 1238 rctx = NULL; 1239 } 1240 } 1241 if (prctx != NULL) 1242 *prctx = rctx; 1243 return resp; 1244 } 1245 1246 int OSSL_HTTP_close(OSSL_HTTP_REQ_CTX *rctx, int ok) 1247 { 1248 BIO *wbio; 1249 int ret = 1; 1250 1251 /* callback can be used to finish TLS session and free its BIO */ 1252 if (rctx != NULL && rctx->upd_fn != NULL) { 1253 wbio = (*rctx->upd_fn)(rctx->wbio, rctx->upd_arg, 1254 0 /* disconnect */, ok); 1255 ret = wbio != NULL; 1256 if (ret) 1257 rctx->wbio = wbio; 1258 } 1259 OSSL_HTTP_REQ_CTX_free(rctx); 1260 return ret; 1261 } 1262 1263 /* BASE64 encoder used for encoding basic proxy authentication credentials */ 1264 static char *base64encode(const void *buf, size_t len) 1265 { 1266 int i; 1267 size_t outl; 1268 char *out; 1269 1270 /* Calculate size of encoded data */ 1271 outl = (len / 3); 1272 if (len % 3 > 0) 1273 outl++; 1274 outl <<= 2; 1275 out = OPENSSL_malloc(outl + 1); 1276 if (out == NULL) 1277 return 0; 1278 1279 i = EVP_EncodeBlock((unsigned char *)out, buf, len); 1280 if (!ossl_assert(0 <= i && (size_t)i <= outl)) { 1281 OPENSSL_free(out); 1282 return NULL; 1283 } 1284 return out; 1285 } 1286 1287 /* 1288 * Promote the given connection BIO using the CONNECT method for a TLS proxy. 1289 * This is typically called by an app, so bio_err and prog are used unless NULL 1290 * to print additional diagnostic information in a user-oriented way. 1291 */ 1292 int OSSL_HTTP_proxy_connect(BIO *bio, const char *server, const char *port, 1293 const char *proxyuser, const char *proxypass, 1294 int timeout, BIO *bio_err, const char *prog) 1295 { 1296 #undef BUF_SIZE 1297 #define BUF_SIZE (8 * 1024) 1298 char *mbuf = OPENSSL_malloc(BUF_SIZE); 1299 char *mbufp; 1300 int read_len = 0; 1301 int ret = 0; 1302 BIO *fbio = BIO_new(BIO_f_buffer()); 1303 int rv; 1304 time_t max_time = timeout > 0 ? time(NULL) + timeout : 0; 1305 1306 if (bio == NULL || server == NULL 1307 || (bio_err != NULL && prog == NULL)) { 1308 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); 1309 goto end; 1310 } 1311 if (port == NULL || *port == '\0') 1312 port = OSSL_HTTPS_PORT; 1313 1314 if (mbuf == NULL || fbio == NULL) { 1315 BIO_printf(bio_err /* may be NULL */, "%s: out of memory", prog); 1316 goto end; 1317 } 1318 BIO_push(fbio, bio); 1319 1320 BIO_printf(fbio, "CONNECT %s:%s "HTTP_1_0"\r\n", server, port); 1321 1322 /* 1323 * Workaround for broken proxies which would otherwise close 1324 * the connection when entering tunnel mode (e.g., Squid 2.6) 1325 */ 1326 BIO_printf(fbio, "Proxy-Connection: Keep-Alive\r\n"); 1327 1328 /* Support for basic (base64) proxy authentication */ 1329 if (proxyuser != NULL) { 1330 size_t len = strlen(proxyuser) + 1; 1331 char *proxyauth, *proxyauthenc = NULL; 1332 1333 if (proxypass != NULL) 1334 len += strlen(proxypass); 1335 proxyauth = OPENSSL_malloc(len + 1); 1336 if (proxyauth == NULL) 1337 goto end; 1338 if (BIO_snprintf(proxyauth, len + 1, "%s:%s", proxyuser, 1339 proxypass != NULL ? proxypass : "") != (int)len) 1340 goto proxy_end; 1341 proxyauthenc = base64encode(proxyauth, len); 1342 if (proxyauthenc != NULL) { 1343 BIO_printf(fbio, "Proxy-Authorization: Basic %s\r\n", proxyauthenc); 1344 OPENSSL_clear_free(proxyauthenc, strlen(proxyauthenc)); 1345 } 1346 proxy_end: 1347 OPENSSL_clear_free(proxyauth, len); 1348 if (proxyauthenc == NULL) 1349 goto end; 1350 } 1351 1352 /* Terminate the HTTP CONNECT request */ 1353 BIO_printf(fbio, "\r\n"); 1354 1355 for (;;) { 1356 if (BIO_flush(fbio) != 0) 1357 break; 1358 /* potentially needs to be retried if BIO is non-blocking */ 1359 if (!BIO_should_retry(fbio)) 1360 break; 1361 } 1362 1363 for (;;) { 1364 /* will not actually wait if timeout == 0 */ 1365 rv = BIO_wait(fbio, max_time, 100 /* milliseconds */); 1366 if (rv <= 0) { 1367 BIO_printf(bio_err, "%s: HTTP CONNECT %s\n", prog, 1368 rv == 0 ? "timed out" : "failed waiting for data"); 1369 goto end; 1370 } 1371 1372 /*- 1373 * The first line is the HTTP response. 1374 * According to RFC 7230, it is formatted exactly like this: 1375 * HTTP/d.d ddd reason text\r\n 1376 */ 1377 read_len = BIO_gets(fbio, mbuf, BUF_SIZE); 1378 /* the BIO may not block, so we must wait for the 1st line to come in */ 1379 if (read_len < (int)HTTP_LINE1_MINLEN) 1380 continue; 1381 1382 /* Check for HTTP/1.x */ 1383 if (!HAS_PREFIX(mbuf, HTTP_PREFIX) != 0) { 1384 ERR_raise(ERR_LIB_HTTP, HTTP_R_HEADER_PARSE_ERROR); 1385 BIO_printf(bio_err, "%s: HTTP CONNECT failed, non-HTTP response\n", 1386 prog); 1387 /* Wrong protocol, not even HTTP, so stop reading headers */ 1388 goto end; 1389 } 1390 mbufp = mbuf + strlen(HTTP_PREFIX); 1391 if (!HAS_PREFIX(mbufp, HTTP_VERSION_PATT) != 0) { 1392 ERR_raise(ERR_LIB_HTTP, HTTP_R_RECEIVED_WRONG_HTTP_VERSION); 1393 BIO_printf(bio_err, 1394 "%s: HTTP CONNECT failed, bad HTTP version %.*s\n", 1395 prog, (int)HTTP_VERSION_STR_LEN, mbufp); 1396 goto end; 1397 } 1398 mbufp += HTTP_VERSION_STR_LEN; 1399 1400 /* RFC 7231 4.3.6: any 2xx status code is valid */ 1401 if (!HAS_PREFIX(mbufp, " 2")) { 1402 /* chop any trailing whitespace */ 1403 while (read_len > 0 && ossl_isspace(mbuf[read_len - 1])) 1404 read_len--; 1405 mbuf[read_len] = '\0'; 1406 ERR_raise_data(ERR_LIB_HTTP, HTTP_R_CONNECT_FAILURE, 1407 "reason=%s", mbufp); 1408 BIO_printf(bio_err, "%s: HTTP CONNECT failed, reason=%s\n", 1409 prog, mbufp); 1410 goto end; 1411 } 1412 ret = 1; 1413 break; 1414 } 1415 1416 /* Read past all following headers */ 1417 do { 1418 /* 1419 * This does not necessarily catch the case when the full 1420 * HTTP response came in in more than a single TCP message. 1421 */ 1422 read_len = BIO_gets(fbio, mbuf, BUF_SIZE); 1423 } while (read_len > 2); 1424 1425 end: 1426 if (fbio != NULL) { 1427 (void)BIO_flush(fbio); 1428 BIO_pop(fbio); 1429 BIO_free(fbio); 1430 } 1431 OPENSSL_free(mbuf); 1432 return ret; 1433 #undef BUF_SIZE 1434 } 1435