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