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 return 0; 494 } 495 if (rctx->resp_len != 0 && rctx->resp_len != len) { 496 ERR_raise_data(ERR_LIB_HTTP, HTTP_R_INCONSISTENT_CONTENT_LENGTH, 497 "ASN.1 length=%zu, Content-Length=%zu", 498 len, rctx->resp_len); 499 return 0; 500 } 501 rctx->resp_len = len; 502 return 1; 503 } 504 505 static int may_still_retry(time_t max_time, int *ptimeout) 506 { 507 time_t time_diff, now = time(NULL); 508 509 if (max_time != 0) { 510 if (max_time < now) { 511 ERR_raise(ERR_LIB_HTTP, HTTP_R_RETRY_TIMEOUT); 512 return 0; 513 } 514 time_diff = max_time - now; 515 *ptimeout = time_diff > INT_MAX ? INT_MAX : (int)time_diff; 516 } 517 return 1; 518 } 519 520 /* 521 * Try exchanging request and response via HTTP on (non-)blocking BIO in rctx. 522 * Returns 1 on success, 0 on error or redirection, -1 on BIO_should_retry. 523 */ 524 int OSSL_HTTP_REQ_CTX_nbio(OSSL_HTTP_REQ_CTX *rctx) 525 { 526 int i, found_expected_ct = 0, found_keep_alive = 0; 527 long n; 528 size_t resp_len; 529 const unsigned char *p; 530 char *buf, *key, *value, *line_end = NULL; 531 532 if (rctx == NULL) { 533 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); 534 return 0; 535 } 536 if (rctx->mem == NULL || rctx->wbio == NULL || rctx->rbio == NULL) { 537 ERR_raise(ERR_LIB_HTTP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); 538 return 0; 539 } 540 541 rctx->redirection_url = NULL; 542 next_io: 543 buf = (char *)rctx->buf; 544 if ((rctx->state & OHS_NOREAD) == 0) { 545 if (rctx->expect_asn1) { 546 n = BIO_read(rctx->rbio, rctx->buf, rctx->buf_size); 547 } else { 548 (void)ERR_set_mark(); 549 n = BIO_gets(rctx->rbio, buf, rctx->buf_size); 550 if (n == -2) { /* unsupported method */ 551 (void)ERR_pop_to_mark(); 552 n = BIO_get_line(rctx->rbio, buf, rctx->buf_size); 553 } else { 554 (void)ERR_clear_last_mark(); 555 } 556 } 557 if (n <= 0) { 558 if (BIO_should_retry(rctx->rbio)) 559 return -1; 560 ERR_raise(ERR_LIB_HTTP, HTTP_R_FAILED_READING_DATA); 561 return 0; 562 } 563 564 /* Write data to memory BIO */ 565 if (BIO_write(rctx->mem, rctx->buf, n) != n) 566 return 0; 567 } 568 569 switch (rctx->state) { 570 case OHS_ADD_HEADERS: 571 /* Last operation was adding headers: need a final \r\n */ 572 if (BIO_write(rctx->mem, "\r\n", 2) != 2) { 573 rctx->state = OHS_ERROR; 574 return 0; 575 } 576 rctx->state = OHS_WRITE_INIT; 577 578 /* fall thru */ 579 case OHS_WRITE_INIT: 580 rctx->len_to_send = BIO_get_mem_data(rctx->mem, &rctx->pos); 581 rctx->state = OHS_WRITE_HDR; 582 583 /* fall thru */ 584 case OHS_WRITE_HDR: 585 /* Copy some chunk of data from rctx->mem to rctx->wbio */ 586 case OHS_WRITE_REQ: 587 /* Copy some chunk of data from rctx->req to rctx->wbio */ 588 589 if (rctx->len_to_send > 0) { 590 i = BIO_write(rctx->wbio, rctx->pos, rctx->len_to_send); 591 if (i <= 0) { 592 if (BIO_should_retry(rctx->wbio)) 593 return -1; 594 rctx->state = OHS_ERROR; 595 return 0; 596 } 597 rctx->pos += i; 598 rctx->len_to_send -= i; 599 goto next_io; 600 } 601 if (rctx->state == OHS_WRITE_HDR) { 602 (void)BIO_reset(rctx->mem); 603 rctx->state = OHS_WRITE_REQ; 604 } 605 if (rctx->req != NULL && !BIO_eof(rctx->req)) { 606 n = BIO_read(rctx->req, rctx->buf, rctx->buf_size); 607 if (n <= 0) { 608 if (BIO_should_retry(rctx->req)) 609 return -1; 610 ERR_raise(ERR_LIB_HTTP, HTTP_R_FAILED_READING_DATA); 611 return 0; 612 } 613 rctx->pos = rctx->buf; 614 rctx->len_to_send = n; 615 goto next_io; 616 } 617 rctx->state = OHS_FLUSH; 618 619 /* fall thru */ 620 case OHS_FLUSH: 621 622 i = BIO_flush(rctx->wbio); 623 624 if (i > 0) { 625 rctx->state = OHS_FIRSTLINE; 626 goto next_io; 627 } 628 629 if (BIO_should_retry(rctx->wbio)) 630 return -1; 631 632 rctx->state = OHS_ERROR; 633 return 0; 634 635 case OHS_ERROR: 636 return 0; 637 638 case OHS_FIRSTLINE: 639 case OHS_HEADERS: 640 case OHS_REDIRECT: 641 642 /* Attempt to read a line in */ 643 next_line: 644 /* 645 * Due to strange memory BIO behavior with BIO_gets we have to check 646 * there's a complete line in there before calling BIO_gets or we'll 647 * just get a partial read. 648 */ 649 n = BIO_get_mem_data(rctx->mem, &p); 650 if (n <= 0 || memchr(p, '\n', n) == 0) { 651 if (n >= rctx->buf_size) { 652 rctx->state = OHS_ERROR; 653 return 0; 654 } 655 goto next_io; 656 } 657 n = BIO_gets(rctx->mem, buf, rctx->buf_size); 658 659 if (n <= 0) { 660 if (BIO_should_retry(rctx->mem)) 661 goto next_io; 662 rctx->state = OHS_ERROR; 663 return 0; 664 } 665 666 /* Don't allow excessive lines */ 667 if (n == rctx->buf_size) { 668 ERR_raise(ERR_LIB_HTTP, HTTP_R_RESPONSE_LINE_TOO_LONG); 669 rctx->state = OHS_ERROR; 670 return 0; 671 } 672 673 /* First line */ 674 if (rctx->state == OHS_FIRSTLINE) { 675 switch (parse_http_line1(buf, &found_keep_alive)) { 676 case HTTP_STATUS_CODE_OK: 677 rctx->state = OHS_HEADERS; 678 goto next_line; 679 case HTTP_STATUS_CODE_MOVED_PERMANENTLY: 680 case HTTP_STATUS_CODE_FOUND: /* i.e., moved temporarily */ 681 if (!rctx->method_POST) { /* method is GET */ 682 rctx->state = OHS_REDIRECT; 683 goto next_line; 684 } 685 ERR_raise(ERR_LIB_HTTP, HTTP_R_REDIRECTION_NOT_ENABLED); 686 /* redirection is not supported/recommended for POST */ 687 /* fall through */ 688 default: 689 rctx->state = OHS_ERROR; 690 goto next_line; 691 } 692 } 693 key = buf; 694 value = strchr(key, ':'); 695 if (value != NULL) { 696 *(value++) = '\0'; 697 while (ossl_isspace(*value)) 698 value++; 699 line_end = strchr(value, '\r'); 700 if (line_end == NULL) 701 line_end = strchr(value, '\n'); 702 if (line_end != NULL) 703 *line_end = '\0'; 704 } 705 if (value != NULL && line_end != NULL) { 706 if (rctx->state == OHS_REDIRECT 707 && OPENSSL_strcasecmp(key, "Location") == 0) { 708 rctx->redirection_url = value; 709 return 0; 710 } 711 if (rctx->state == OHS_HEADERS && rctx->expected_ct != NULL 712 && OPENSSL_strcasecmp(key, "Content-Type") == 0) { 713 if (OPENSSL_strcasecmp(rctx->expected_ct, value) != 0) { 714 ERR_raise_data(ERR_LIB_HTTP, HTTP_R_UNEXPECTED_CONTENT_TYPE, 715 "expected=%s, actual=%s", 716 rctx->expected_ct, value); 717 return 0; 718 } 719 found_expected_ct = 1; 720 } 721 722 /* https://tools.ietf.org/html/rfc7230#section-6.3 Persistence */ 723 if (OPENSSL_strcasecmp(key, "Connection") == 0) { 724 if (OPENSSL_strcasecmp(value, "keep-alive") == 0) 725 found_keep_alive = 1; 726 else if (OPENSSL_strcasecmp(value, "close") == 0) 727 found_keep_alive = 0; 728 } else if (OPENSSL_strcasecmp(key, "Content-Length") == 0) { 729 resp_len = (size_t)strtoul(value, &line_end, 10); 730 if (line_end == value || *line_end != '\0') { 731 ERR_raise_data(ERR_LIB_HTTP, 732 HTTP_R_ERROR_PARSING_CONTENT_LENGTH, 733 "input=%s", value); 734 return 0; 735 } 736 if (!check_set_resp_len(rctx, resp_len)) 737 return 0; 738 } 739 } 740 741 /* Look for blank line indicating end of headers */ 742 for (p = rctx->buf; *p != '\0'; p++) { 743 if (*p != '\r' && *p != '\n') 744 break; 745 } 746 if (*p != '\0') /* not end of headers */ 747 goto next_line; 748 749 if (rctx->keep_alive != 0 /* do not let server initiate keep_alive */ 750 && !found_keep_alive /* otherwise there is no change */) { 751 if (rctx->keep_alive == 2) { 752 rctx->keep_alive = 0; 753 ERR_raise(ERR_LIB_HTTP, HTTP_R_SERVER_CANCELED_CONNECTION); 754 return 0; 755 } 756 rctx->keep_alive = 0; 757 } 758 759 if (rctx->state == OHS_ERROR) 760 return 0; 761 762 if (rctx->expected_ct != NULL && !found_expected_ct) { 763 ERR_raise_data(ERR_LIB_HTTP, HTTP_R_MISSING_CONTENT_TYPE, 764 "expected=%s", rctx->expected_ct); 765 return 0; 766 } 767 if (rctx->state == OHS_REDIRECT) { 768 /* http status code indicated redirect but there was no Location */ 769 ERR_raise(ERR_LIB_HTTP, HTTP_R_MISSING_REDIRECT_LOCATION); 770 return 0; 771 } 772 773 if (!rctx->expect_asn1) { 774 rctx->state = OHS_STREAM; 775 return 1; 776 } 777 778 rctx->state = OHS_ASN1_HEADER; 779 780 /* Fall thru */ 781 case OHS_ASN1_HEADER: 782 /* 783 * Now reading ASN1 header: can read at least 2 bytes which is enough 784 * for ASN1 SEQUENCE header and either length field or at least the 785 * length of the length field. 786 */ 787 n = BIO_get_mem_data(rctx->mem, &p); 788 if (n < 2) 789 goto next_io; 790 791 /* Check it is an ASN1 SEQUENCE */ 792 if (*p++ != (V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED)) { 793 ERR_raise(ERR_LIB_HTTP, HTTP_R_MISSING_ASN1_ENCODING); 794 return 0; 795 } 796 797 /* Check out length field */ 798 if ((*p & 0x80) != 0) { 799 /* 800 * If MSB set on initial length octet we can now always read 6 801 * octets: make sure we have them. 802 */ 803 if (n < 6) 804 goto next_io; 805 n = *p & 0x7F; 806 /* Not NDEF or excessive length */ 807 if (n == 0 || (n > 4)) { 808 ERR_raise(ERR_LIB_HTTP, HTTP_R_ERROR_PARSING_ASN1_LENGTH); 809 return 0; 810 } 811 p++; 812 resp_len = 0; 813 for (i = 0; i < n; i++) { 814 resp_len <<= 8; 815 resp_len |= *p++; 816 } 817 resp_len += n + 2; 818 } else { 819 resp_len = *p + 2; 820 } 821 if (!check_set_resp_len(rctx, resp_len)) 822 return 0; 823 824 rctx->state = OHS_ASN1_CONTENT; 825 826 /* Fall thru */ 827 case OHS_ASN1_CONTENT: 828 default: 829 n = BIO_get_mem_data(rctx->mem, NULL); 830 if (n < 0 || (size_t)n < rctx->resp_len) 831 goto next_io; 832 833 rctx->state = OHS_ASN1_DONE; 834 return 1; 835 } 836 } 837 838 int OSSL_HTTP_REQ_CTX_nbio_d2i(OSSL_HTTP_REQ_CTX *rctx, 839 ASN1_VALUE **pval, const ASN1_ITEM *it) 840 { 841 const unsigned char *p; 842 int rv; 843 844 *pval = NULL; 845 if ((rv = OSSL_HTTP_REQ_CTX_nbio(rctx)) != 1) 846 return rv; 847 *pval = ASN1_item_d2i(NULL, &p, BIO_get_mem_data(rctx->mem, &p), it); 848 return *pval != NULL; 849 850 } 851 852 #ifndef OPENSSL_NO_SOCK 853 854 /* set up a new connection BIO, to HTTP server or to HTTP(S) proxy if given */ 855 static BIO *http_new_bio(const char *server /* optionally includes ":port" */, 856 const char *server_port /* explicit server port */, 857 int use_ssl, 858 const char *proxy /* optionally includes ":port" */, 859 const char *proxy_port /* explicit proxy port */) 860 { 861 const char *host = server; 862 const char *port = server_port; 863 BIO *cbio; 864 865 if (!ossl_assert(server != NULL)) 866 return NULL; 867 868 if (proxy != NULL) { 869 host = proxy; 870 port = proxy_port; 871 } 872 873 if (port == NULL && strchr(host, ':') == NULL) 874 port = use_ssl ? OSSL_HTTPS_PORT : OSSL_HTTP_PORT; 875 876 cbio = BIO_new_connect(host /* optionally includes ":port" */); 877 if (cbio == NULL) 878 goto end; 879 if (port != NULL) 880 (void)BIO_set_conn_port(cbio, port); 881 882 end: 883 return cbio; 884 } 885 #endif /* OPENSSL_NO_SOCK */ 886 887 /* Exchange request and response via HTTP on (non-)blocking BIO */ 888 BIO *OSSL_HTTP_REQ_CTX_exchange(OSSL_HTTP_REQ_CTX *rctx) 889 { 890 int rv; 891 892 if (rctx == NULL) { 893 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); 894 return NULL; 895 } 896 897 for (;;) { 898 rv = OSSL_HTTP_REQ_CTX_nbio(rctx); 899 if (rv != -1) 900 break; 901 /* BIO_should_retry was true */ 902 /* will not actually wait if rctx->max_time == 0 */ 903 if (BIO_wait(rctx->rbio, rctx->max_time, 100 /* milliseconds */) <= 0) 904 return NULL; 905 } 906 907 if (rv == 0) { 908 if (rctx->redirection_url == NULL) { /* an error occurred */ 909 if (rctx->len_to_send > 0) 910 ERR_raise(ERR_LIB_HTTP, HTTP_R_ERROR_SENDING); 911 else 912 ERR_raise(ERR_LIB_HTTP, HTTP_R_ERROR_RECEIVING); 913 } 914 return NULL; 915 } 916 return rctx->state == OHS_STREAM ? rctx->rbio : rctx->mem; 917 } 918 919 int OSSL_HTTP_is_alive(const OSSL_HTTP_REQ_CTX *rctx) 920 { 921 return rctx != NULL && rctx->keep_alive != 0; 922 } 923 924 /* High-level HTTP API implementation */ 925 926 /* Initiate an HTTP session using bio, else use given server, proxy, etc. */ 927 OSSL_HTTP_REQ_CTX *OSSL_HTTP_open(const char *server, const char *port, 928 const char *proxy, const char *no_proxy, 929 int use_ssl, BIO *bio, BIO *rbio, 930 OSSL_HTTP_bio_cb_t bio_update_fn, void *arg, 931 int buf_size, int overall_timeout) 932 { 933 BIO *cbio; /* == bio if supplied, used as connection BIO if rbio is NULL */ 934 OSSL_HTTP_REQ_CTX *rctx = NULL; 935 936 if (use_ssl && bio_update_fn == NULL) { 937 ERR_raise(ERR_LIB_HTTP, HTTP_R_TLS_NOT_ENABLED); 938 return NULL; 939 } 940 if (rbio != NULL && (bio == NULL || bio_update_fn != NULL)) { 941 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_INVALID_ARGUMENT); 942 return NULL; 943 } 944 945 if (bio != NULL) { 946 cbio = bio; 947 if (proxy != NULL || no_proxy != NULL) { 948 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_INVALID_ARGUMENT); 949 return NULL; 950 } 951 } else { 952 #ifndef OPENSSL_NO_SOCK 953 char *proxy_host = NULL, *proxy_port = NULL; 954 955 if (server == NULL) { 956 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); 957 return NULL; 958 } 959 if (port != NULL && *port == '\0') 960 port = NULL; 961 if (port == NULL && strchr(server, ':') == NULL) 962 port = use_ssl ? OSSL_HTTPS_PORT : OSSL_HTTP_PORT; 963 proxy = OSSL_HTTP_adapt_proxy(proxy, no_proxy, server, use_ssl); 964 if (proxy != NULL 965 && !OSSL_HTTP_parse_url(proxy, NULL /* use_ssl */, NULL /* user */, 966 &proxy_host, &proxy_port, NULL /* num */, 967 NULL /* path */, NULL, NULL)) 968 return NULL; 969 cbio = http_new_bio(server, port, use_ssl, proxy_host, proxy_port); 970 OPENSSL_free(proxy_host); 971 OPENSSL_free(proxy_port); 972 if (cbio == NULL) 973 return NULL; 974 #else 975 ERR_raise(ERR_LIB_HTTP, HTTP_R_SOCK_NOT_SUPPORTED); 976 return NULL; 977 #endif 978 } 979 980 (void)ERR_set_mark(); /* prepare removing any spurious libssl errors */ 981 if (rbio == NULL && BIO_do_connect_retry(cbio, overall_timeout, -1) <= 0) { 982 if (bio == NULL) /* cbio was not provided by caller */ 983 BIO_free_all(cbio); 984 goto end; 985 } 986 /* now overall_timeout is guaranteed to be >= 0 */ 987 988 /* adapt in order to fix callback design flaw, see #17088 */ 989 /* callback can be used to wrap or prepend TLS session */ 990 if (bio_update_fn != NULL) { 991 BIO *orig_bio = cbio; 992 993 cbio = (*bio_update_fn)(cbio, arg, 1 /* connect */, use_ssl != 0); 994 if (cbio == NULL) { 995 if (bio == NULL) /* cbio was not provided by caller */ 996 BIO_free_all(orig_bio); 997 goto end; 998 } 999 } 1000 1001 rctx = http_req_ctx_new(bio == NULL, cbio, rbio != NULL ? rbio : cbio, 1002 bio_update_fn, arg, use_ssl, proxy, server, port, 1003 buf_size, overall_timeout); 1004 1005 end: 1006 if (rctx != NULL) 1007 /* remove any spurious error queue entries by ssl_add_cert_chain() */ 1008 (void)ERR_pop_to_mark(); 1009 else 1010 (void)ERR_clear_last_mark(); 1011 1012 return rctx; 1013 } 1014 1015 int OSSL_HTTP_set1_request(OSSL_HTTP_REQ_CTX *rctx, const char *path, 1016 const STACK_OF(CONF_VALUE) *headers, 1017 const char *content_type, BIO *req, 1018 const char *expected_content_type, int expect_asn1, 1019 size_t max_resp_len, int timeout, int keep_alive) 1020 { 1021 int use_http_proxy; 1022 1023 if (rctx == NULL) { 1024 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); 1025 return 0; 1026 } 1027 use_http_proxy = rctx->proxy != NULL && !rctx->use_ssl; 1028 if (use_http_proxy && rctx->server == NULL) { 1029 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_INVALID_ARGUMENT); 1030 return 0; 1031 } 1032 rctx->max_resp_len = max_resp_len; /* allows for 0: indefinite */ 1033 1034 return OSSL_HTTP_REQ_CTX_set_request_line(rctx, req != NULL, 1035 use_http_proxy ? rctx->server 1036 : NULL, rctx->port, path) 1037 && add1_headers(rctx, headers, rctx->server) 1038 && OSSL_HTTP_REQ_CTX_set_expected(rctx, expected_content_type, 1039 expect_asn1, timeout, keep_alive) 1040 && set1_content(rctx, content_type, req); 1041 } 1042 1043 /*- 1044 * Exchange single HTTP request and response according to rctx. 1045 * If rctx->method_POST then use POST, else use GET and ignore content_type. 1046 * The redirection_url output (freed by caller) parameter is used only for GET. 1047 */ 1048 BIO *OSSL_HTTP_exchange(OSSL_HTTP_REQ_CTX *rctx, char **redirection_url) 1049 { 1050 BIO *resp; 1051 1052 if (rctx == NULL) { 1053 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); 1054 return NULL; 1055 } 1056 1057 if (redirection_url != NULL) 1058 *redirection_url = NULL; /* do this beforehand to prevent dbl free */ 1059 1060 resp = OSSL_HTTP_REQ_CTX_exchange(rctx); 1061 if (resp == NULL) { 1062 if (rctx->redirection_url != NULL) { 1063 if (redirection_url == NULL) 1064 ERR_raise(ERR_LIB_HTTP, HTTP_R_REDIRECTION_NOT_ENABLED); 1065 else 1066 /* may be NULL if out of memory: */ 1067 *redirection_url = OPENSSL_strdup(rctx->redirection_url); 1068 } else { 1069 char buf[200]; 1070 unsigned long err = ERR_peek_error(); 1071 int lib = ERR_GET_LIB(err); 1072 int reason = ERR_GET_REASON(err); 1073 1074 if (lib == ERR_LIB_SSL || lib == ERR_LIB_HTTP 1075 || (lib == ERR_LIB_BIO && reason == BIO_R_CONNECT_TIMEOUT) 1076 || (lib == ERR_LIB_BIO && reason == BIO_R_CONNECT_ERROR) 1077 #ifndef OPENSSL_NO_CMP 1078 || (lib == ERR_LIB_CMP 1079 && reason == CMP_R_POTENTIALLY_INVALID_CERTIFICATE) 1080 #endif 1081 ) { 1082 if (rctx->server != NULL) { 1083 BIO_snprintf(buf, sizeof(buf), "server=http%s://%s%s%s", 1084 rctx->use_ssl ? "s" : "", rctx->server, 1085 rctx->port != NULL ? ":" : "", 1086 rctx->port != NULL ? rctx->port : ""); 1087 ERR_add_error_data(1, buf); 1088 } 1089 if (rctx->proxy != NULL) 1090 ERR_add_error_data(2, " proxy=", rctx->proxy); 1091 if (err == 0) { 1092 BIO_snprintf(buf, sizeof(buf), " peer has disconnected%s", 1093 rctx->use_ssl ? " violating the protocol" : 1094 ", likely because it requires the use of TLS"); 1095 ERR_add_error_data(1, buf); 1096 } 1097 } 1098 } 1099 } 1100 1101 if (resp != NULL && !BIO_up_ref(resp)) 1102 resp = NULL; 1103 return resp; 1104 } 1105 1106 static int redirection_ok(int n_redir, const char *old_url, const char *new_url) 1107 { 1108 if (n_redir >= HTTP_VERSION_MAX_REDIRECTIONS) { 1109 ERR_raise(ERR_LIB_HTTP, HTTP_R_TOO_MANY_REDIRECTIONS); 1110 return 0; 1111 } 1112 if (*new_url == '/') /* redirection to same server => same protocol */ 1113 return 1; 1114 if (HAS_PREFIX(old_url, OSSL_HTTPS_NAME":") && 1115 !HAS_PREFIX(new_url, OSSL_HTTPS_NAME":")) { 1116 ERR_raise(ERR_LIB_HTTP, HTTP_R_REDIRECTION_FROM_HTTPS_TO_HTTP); 1117 return 0; 1118 } 1119 return 1; 1120 } 1121 1122 /* Get data via HTTP from server at given URL, potentially with redirection */ 1123 BIO *OSSL_HTTP_get(const char *url, const char *proxy, const char *no_proxy, 1124 BIO *bio, BIO *rbio, 1125 OSSL_HTTP_bio_cb_t bio_update_fn, void *arg, 1126 int buf_size, const STACK_OF(CONF_VALUE) *headers, 1127 const char *expected_ct, int expect_asn1, 1128 size_t max_resp_len, int timeout) 1129 { 1130 char *current_url, *redirection_url = NULL; 1131 int n_redirs = 0; 1132 char *host; 1133 char *port; 1134 char *path; 1135 int use_ssl; 1136 OSSL_HTTP_REQ_CTX *rctx = NULL; 1137 BIO *resp = NULL; 1138 time_t max_time = timeout > 0 ? time(NULL) + timeout : 0; 1139 1140 if (url == NULL) { 1141 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); 1142 return NULL; 1143 } 1144 if ((current_url = OPENSSL_strdup(url)) == NULL) 1145 return NULL; 1146 1147 for (;;) { 1148 if (!OSSL_HTTP_parse_url(current_url, &use_ssl, NULL /* user */, &host, 1149 &port, NULL /* port_num */, &path, NULL, NULL)) 1150 break; 1151 1152 rctx = OSSL_HTTP_open(host, port, proxy, no_proxy, 1153 use_ssl, bio, rbio, bio_update_fn, arg, 1154 buf_size, timeout); 1155 new_rpath: 1156 if (rctx != NULL) { 1157 if (!OSSL_HTTP_set1_request(rctx, path, headers, 1158 NULL /* content_type */, 1159 NULL /* req */, 1160 expected_ct, expect_asn1, max_resp_len, 1161 -1 /* use same max time (timeout) */, 1162 0 /* no keep_alive */)) { 1163 OSSL_HTTP_REQ_CTX_free(rctx); 1164 rctx = NULL; 1165 } else { 1166 resp = OSSL_HTTP_exchange(rctx, &redirection_url); 1167 } 1168 } 1169 OPENSSL_free(path); 1170 if (resp == NULL && redirection_url != NULL) { 1171 if (redirection_ok(++n_redirs, current_url, redirection_url) 1172 && may_still_retry(max_time, &timeout)) { 1173 (void)BIO_reset(bio); 1174 OPENSSL_free(current_url); 1175 current_url = redirection_url; 1176 if (*redirection_url == '/') { /* redirection to same server */ 1177 path = OPENSSL_strdup(redirection_url); 1178 if (path == NULL) { 1179 OPENSSL_free(host); 1180 OPENSSL_free(port); 1181 (void)OSSL_HTTP_close(rctx, 1); 1182 rctx = NULL; 1183 BIO_free(resp); 1184 OPENSSL_free(current_url); 1185 return NULL; 1186 } 1187 goto new_rpath; 1188 } 1189 OPENSSL_free(host); 1190 OPENSSL_free(port); 1191 (void)OSSL_HTTP_close(rctx, 1); 1192 rctx = NULL; 1193 continue; 1194 } 1195 /* if redirection not allowed, ignore it */ 1196 OPENSSL_free(redirection_url); 1197 } 1198 OPENSSL_free(host); 1199 OPENSSL_free(port); 1200 if (!OSSL_HTTP_close(rctx, resp != NULL)) { 1201 BIO_free(resp); 1202 rctx = NULL; 1203 resp = NULL; 1204 } 1205 break; 1206 } 1207 OPENSSL_free(current_url); 1208 return resp; 1209 } 1210 1211 /* Exchange request and response over a connection managed via |prctx| */ 1212 BIO *OSSL_HTTP_transfer(OSSL_HTTP_REQ_CTX **prctx, 1213 const char *server, const char *port, 1214 const char *path, int use_ssl, 1215 const char *proxy, const char *no_proxy, 1216 BIO *bio, BIO *rbio, 1217 OSSL_HTTP_bio_cb_t bio_update_fn, void *arg, 1218 int buf_size, const STACK_OF(CONF_VALUE) *headers, 1219 const char *content_type, BIO *req, 1220 const char *expected_ct, int expect_asn1, 1221 size_t max_resp_len, int timeout, int keep_alive) 1222 { 1223 OSSL_HTTP_REQ_CTX *rctx = prctx == NULL ? NULL : *prctx; 1224 BIO *resp = NULL; 1225 1226 if (rctx == NULL) { 1227 rctx = OSSL_HTTP_open(server, port, proxy, no_proxy, 1228 use_ssl, bio, rbio, bio_update_fn, arg, 1229 buf_size, timeout); 1230 timeout = -1; /* Already set during opening the connection */ 1231 } 1232 if (rctx != NULL) { 1233 if (OSSL_HTTP_set1_request(rctx, path, headers, content_type, req, 1234 expected_ct, expect_asn1, 1235 max_resp_len, timeout, keep_alive)) 1236 resp = OSSL_HTTP_exchange(rctx, NULL); 1237 if (resp == NULL || !OSSL_HTTP_is_alive(rctx)) { 1238 if (!OSSL_HTTP_close(rctx, resp != NULL)) { 1239 BIO_free(resp); 1240 resp = NULL; 1241 } 1242 rctx = NULL; 1243 } 1244 } 1245 if (prctx != NULL) 1246 *prctx = rctx; 1247 return resp; 1248 } 1249 1250 int OSSL_HTTP_close(OSSL_HTTP_REQ_CTX *rctx, int ok) 1251 { 1252 BIO *wbio; 1253 int ret = 1; 1254 1255 /* callback can be used to finish TLS session and free its BIO */ 1256 if (rctx != NULL && rctx->upd_fn != NULL) { 1257 wbio = (*rctx->upd_fn)(rctx->wbio, rctx->upd_arg, 1258 0 /* disconnect */, ok); 1259 ret = wbio != NULL; 1260 if (ret) 1261 rctx->wbio = wbio; 1262 } 1263 OSSL_HTTP_REQ_CTX_free(rctx); 1264 return ret; 1265 } 1266 1267 /* BASE64 encoder used for encoding basic proxy authentication credentials */ 1268 static char *base64encode(const void *buf, size_t len) 1269 { 1270 int i; 1271 size_t outl; 1272 char *out; 1273 1274 /* Calculate size of encoded data */ 1275 outl = (len / 3); 1276 if (len % 3 > 0) 1277 outl++; 1278 outl <<= 2; 1279 out = OPENSSL_malloc(outl + 1); 1280 if (out == NULL) 1281 return 0; 1282 1283 i = EVP_EncodeBlock((unsigned char *)out, buf, len); 1284 if (!ossl_assert(0 <= i && (size_t)i <= outl)) { 1285 OPENSSL_free(out); 1286 return NULL; 1287 } 1288 return out; 1289 } 1290 1291 /* 1292 * Promote the given connection BIO using the CONNECT method for a TLS proxy. 1293 * This is typically called by an app, so bio_err and prog are used unless NULL 1294 * to print additional diagnostic information in a user-oriented way. 1295 */ 1296 int OSSL_HTTP_proxy_connect(BIO *bio, const char *server, const char *port, 1297 const char *proxyuser, const char *proxypass, 1298 int timeout, BIO *bio_err, const char *prog) 1299 { 1300 #undef BUF_SIZE 1301 #define BUF_SIZE (8 * 1024) 1302 char *mbuf = OPENSSL_malloc(BUF_SIZE); 1303 char *mbufp; 1304 int read_len = 0; 1305 int ret = 0; 1306 BIO *fbio = BIO_new(BIO_f_buffer()); 1307 int rv; 1308 time_t max_time = timeout > 0 ? time(NULL) + timeout : 0; 1309 1310 if (bio == NULL || server == NULL 1311 || (bio_err != NULL && prog == NULL)) { 1312 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); 1313 goto end; 1314 } 1315 if (port == NULL || *port == '\0') 1316 port = OSSL_HTTPS_PORT; 1317 1318 if (mbuf == NULL || fbio == NULL) { 1319 BIO_printf(bio_err /* may be NULL */, "%s: out of memory", prog); 1320 goto end; 1321 } 1322 BIO_push(fbio, bio); 1323 1324 BIO_printf(fbio, "CONNECT %s:%s "HTTP_1_0"\r\n", server, port); 1325 1326 /* 1327 * Workaround for broken proxies which would otherwise close 1328 * the connection when entering tunnel mode (e.g., Squid 2.6) 1329 */ 1330 BIO_printf(fbio, "Proxy-Connection: Keep-Alive\r\n"); 1331 1332 /* Support for basic (base64) proxy authentication */ 1333 if (proxyuser != NULL) { 1334 size_t len = strlen(proxyuser) + 1; 1335 char *proxyauth, *proxyauthenc = NULL; 1336 1337 if (proxypass != NULL) 1338 len += strlen(proxypass); 1339 proxyauth = OPENSSL_malloc(len + 1); 1340 if (proxyauth == NULL) 1341 goto end; 1342 if (BIO_snprintf(proxyauth, len + 1, "%s:%s", proxyuser, 1343 proxypass != NULL ? proxypass : "") != (int)len) 1344 goto proxy_end; 1345 proxyauthenc = base64encode(proxyauth, len); 1346 if (proxyauthenc != NULL) { 1347 BIO_printf(fbio, "Proxy-Authorization: Basic %s\r\n", proxyauthenc); 1348 OPENSSL_clear_free(proxyauthenc, strlen(proxyauthenc)); 1349 } 1350 proxy_end: 1351 OPENSSL_clear_free(proxyauth, len); 1352 if (proxyauthenc == NULL) 1353 goto end; 1354 } 1355 1356 /* Terminate the HTTP CONNECT request */ 1357 BIO_printf(fbio, "\r\n"); 1358 1359 for (;;) { 1360 if (BIO_flush(fbio) != 0) 1361 break; 1362 /* potentially needs to be retried if BIO is non-blocking */ 1363 if (!BIO_should_retry(fbio)) 1364 break; 1365 } 1366 1367 for (;;) { 1368 /* will not actually wait if timeout == 0 */ 1369 rv = BIO_wait(fbio, max_time, 100 /* milliseconds */); 1370 if (rv <= 0) { 1371 BIO_printf(bio_err, "%s: HTTP CONNECT %s\n", prog, 1372 rv == 0 ? "timed out" : "failed waiting for data"); 1373 goto end; 1374 } 1375 1376 /*- 1377 * The first line is the HTTP response. 1378 * According to RFC 7230, it is formatted exactly like this: 1379 * HTTP/d.d ddd reason text\r\n 1380 */ 1381 read_len = BIO_gets(fbio, mbuf, BUF_SIZE); 1382 /* the BIO may not block, so we must wait for the 1st line to come in */ 1383 if (read_len < (int)HTTP_LINE1_MINLEN) 1384 continue; 1385 1386 /* Check for HTTP/1.x */ 1387 if (!HAS_PREFIX(mbuf, HTTP_PREFIX) != 0) { 1388 ERR_raise(ERR_LIB_HTTP, HTTP_R_HEADER_PARSE_ERROR); 1389 BIO_printf(bio_err, "%s: HTTP CONNECT failed, non-HTTP response\n", 1390 prog); 1391 /* Wrong protocol, not even HTTP, so stop reading headers */ 1392 goto end; 1393 } 1394 mbufp = mbuf + strlen(HTTP_PREFIX); 1395 if (!HAS_PREFIX(mbufp, HTTP_VERSION_PATT) != 0) { 1396 ERR_raise(ERR_LIB_HTTP, HTTP_R_RECEIVED_WRONG_HTTP_VERSION); 1397 BIO_printf(bio_err, 1398 "%s: HTTP CONNECT failed, bad HTTP version %.*s\n", 1399 prog, (int)HTTP_VERSION_STR_LEN, mbufp); 1400 goto end; 1401 } 1402 mbufp += HTTP_VERSION_STR_LEN; 1403 1404 /* RFC 7231 4.3.6: any 2xx status code is valid */ 1405 if (!HAS_PREFIX(mbufp, " 2")) { 1406 /* chop any trailing whitespace */ 1407 while (read_len > 0 && ossl_isspace(mbuf[read_len - 1])) 1408 read_len--; 1409 mbuf[read_len] = '\0'; 1410 ERR_raise_data(ERR_LIB_HTTP, HTTP_R_CONNECT_FAILURE, 1411 "reason=%s", mbufp); 1412 BIO_printf(bio_err, "%s: HTTP CONNECT failed, reason=%s\n", 1413 prog, mbufp); 1414 goto end; 1415 } 1416 ret = 1; 1417 break; 1418 } 1419 1420 /* Read past all following headers */ 1421 do { 1422 /* 1423 * This does not necessarily catch the case when the full 1424 * HTTP response came in in more than a single TCP message. 1425 */ 1426 read_len = BIO_gets(fbio, mbuf, BUF_SIZE); 1427 } while (read_len > 2); 1428 1429 end: 1430 if (fbio != NULL) { 1431 (void)BIO_flush(fbio); 1432 BIO_pop(fbio); 1433 BIO_free(fbio); 1434 } 1435 OPENSSL_free(mbuf); 1436 return ret; 1437 #undef BUF_SIZE 1438 } 1439