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source: vbox/trunk/src/libs/openssl-3.0.7/crypto/http/http_client.c@ 98024

Last change on this file since 98024 was 97372, checked in by vboxsync, 2 years ago

libs: Switch to openssl-3.0.7, bugref:10317
File size: 47.5 KB
Line 
1/*
2 * Copyright 2001-2022 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;
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 else
1154 resp = OSSL_HTTP_exchange(rctx, &redirection_url);
1155 }
1156 OPENSSL_free(path);
1157 if (resp == NULL && redirection_url != NULL) {
1158 if (redirection_ok(++n_redirs, current_url, redirection_url)
1159 && may_still_retry(max_time, &timeout)) {
1160 (void)BIO_reset(bio);
1161 OPENSSL_free(current_url);
1162 current_url = redirection_url;
1163 if (*redirection_url == '/') { /* redirection to same server */
1164 path = OPENSSL_strdup(redirection_url);
1165 if (path == NULL) {
1166 OPENSSL_free(host);
1167 OPENSSL_free(port);
1168 (void)OSSL_HTTP_close(rctx, 1);
1169 BIO_free(resp);
1170 OPENSSL_free(current_url);
1171 return NULL;
1172 }
1173 goto new_rpath;
1174 }
1175 OPENSSL_free(host);
1176 OPENSSL_free(port);
1177 (void)OSSL_HTTP_close(rctx, 1);
1178 continue;
1179 }
1180 /* if redirection not allowed, ignore it */
1181 OPENSSL_free(redirection_url);
1182 }
1183 OPENSSL_free(host);
1184 OPENSSL_free(port);
1185 if (!OSSL_HTTP_close(rctx, resp != NULL)) {
1186 BIO_free(resp);
1187 resp = NULL;
1188 }
1189 break;
1190 }
1191 OPENSSL_free(current_url);
1192 return resp;
1193}
1194
1195/* Exchange request and response over a connection managed via |prctx| */
1196BIO *OSSL_HTTP_transfer(OSSL_HTTP_REQ_CTX **prctx,
1197 const char *server, const char *port,
1198 const char *path, int use_ssl,
1199 const char *proxy, const char *no_proxy,
1200 BIO *bio, BIO *rbio,
1201 OSSL_HTTP_bio_cb_t bio_update_fn, void *arg,
1202 int buf_size, const STACK_OF(CONF_VALUE) *headers,
1203 const char *content_type, BIO *req,
1204 const char *expected_ct, int expect_asn1,
1205 size_t max_resp_len, int timeout, int keep_alive)
1206{
1207 OSSL_HTTP_REQ_CTX *rctx = prctx == NULL ? NULL : *prctx;
1208 BIO *resp = NULL;
1209
1210 if (rctx == NULL) {
1211 rctx = OSSL_HTTP_open(server, port, proxy, no_proxy,
1212 use_ssl, bio, rbio, bio_update_fn, arg,
1213 buf_size, timeout);
1214 timeout = -1; /* Already set during opening the connection */
1215 }
1216 if (rctx != NULL) {
1217 if (OSSL_HTTP_set1_request(rctx, path, headers, content_type, req,
1218 expected_ct, expect_asn1,
1219 max_resp_len, timeout, keep_alive))
1220 resp = OSSL_HTTP_exchange(rctx, NULL);
1221 if (resp == NULL || !OSSL_HTTP_is_alive(rctx)) {
1222 if (!OSSL_HTTP_close(rctx, resp != NULL)) {
1223 BIO_free(resp);
1224 resp = NULL;
1225 }
1226 rctx = NULL;
1227 }
1228 }
1229 if (prctx != NULL)
1230 *prctx = rctx;
1231 return resp;
1232}
1233
1234int OSSL_HTTP_close(OSSL_HTTP_REQ_CTX *rctx, int ok)
1235{
1236 BIO *wbio;
1237 int ret = 1;
1238
1239 /* callback can be used to finish TLS session and free its BIO */
1240 if (rctx != NULL && rctx->upd_fn != NULL) {
1241 wbio = (*rctx->upd_fn)(rctx->wbio, rctx->upd_arg,
1242 0 /* disconnect */, ok);
1243 ret = wbio != NULL;
1244 if (ret)
1245 rctx->wbio = wbio;
1246 }
1247 OSSL_HTTP_REQ_CTX_free(rctx);
1248 return ret;
1249}
1250
1251/* BASE64 encoder used for encoding basic proxy authentication credentials */
1252static char *base64encode(const void *buf, size_t len)
1253{
1254 int i;
1255 size_t outl;
1256 char *out;
1257
1258 /* Calculate size of encoded data */
1259 outl = (len / 3);
1260 if (len % 3 > 0)
1261 outl++;
1262 outl <<= 2;
1263 out = OPENSSL_malloc(outl + 1);
1264 if (out == NULL)
1265 return 0;
1266
1267 i = EVP_EncodeBlock((unsigned char *)out, buf, len);
1268 if (!ossl_assert(0 <= i && (size_t)i <= outl)) {
1269 OPENSSL_free(out);
1270 return NULL;
1271 }
1272 return out;
1273}
1274
1275/*
1276 * Promote the given connection BIO using the CONNECT method for a TLS proxy.
1277 * This is typically called by an app, so bio_err and prog are used unless NULL
1278 * to print additional diagnostic information in a user-oriented way.
1279 */
1280int OSSL_HTTP_proxy_connect(BIO *bio, const char *server, const char *port,
1281 const char *proxyuser, const char *proxypass,
1282 int timeout, BIO *bio_err, const char *prog)
1283{
1284#undef BUF_SIZE
1285#define BUF_SIZE (8 * 1024)
1286 char *mbuf = OPENSSL_malloc(BUF_SIZE);
1287 char *mbufp;
1288 int read_len = 0;
1289 int ret = 0;
1290 BIO *fbio = BIO_new(BIO_f_buffer());
1291 int rv;
1292 time_t max_time = timeout > 0 ? time(NULL) + timeout : 0;
1293
1294 if (bio == NULL || server == NULL
1295 || (bio_err != NULL && prog == NULL)) {
1296 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER);
1297 goto end;
1298 }
1299 if (port == NULL || *port == '\0')
1300 port = OSSL_HTTPS_PORT;
1301
1302 if (mbuf == NULL || fbio == NULL) {
1303 BIO_printf(bio_err /* may be NULL */, "%s: out of memory", prog);
1304 goto end;
1305 }
1306 BIO_push(fbio, bio);
1307
1308 BIO_printf(fbio, "CONNECT %s:%s "HTTP_1_0"\r\n", server, port);
1309
1310 /*
1311 * Workaround for broken proxies which would otherwise close
1312 * the connection when entering tunnel mode (e.g., Squid 2.6)
1313 */
1314 BIO_printf(fbio, "Proxy-Connection: Keep-Alive\r\n");
1315
1316 /* Support for basic (base64) proxy authentication */
1317 if (proxyuser != NULL) {
1318 size_t len = strlen(proxyuser) + 1;
1319 char *proxyauth, *proxyauthenc = NULL;
1320
1321 if (proxypass != NULL)
1322 len += strlen(proxypass);
1323 proxyauth = OPENSSL_malloc(len + 1);
1324 if (proxyauth == NULL)
1325 goto end;
1326 if (BIO_snprintf(proxyauth, len + 1, "%s:%s", proxyuser,
1327 proxypass != NULL ? proxypass : "") != (int)len)
1328 goto proxy_end;
1329 proxyauthenc = base64encode(proxyauth, len);
1330 if (proxyauthenc != NULL) {
1331 BIO_printf(fbio, "Proxy-Authorization: Basic %s\r\n", proxyauthenc);
1332 OPENSSL_clear_free(proxyauthenc, strlen(proxyauthenc));
1333 }
1334 proxy_end:
1335 OPENSSL_clear_free(proxyauth, len);
1336 if (proxyauthenc == NULL)
1337 goto end;
1338 }
1339
1340 /* Terminate the HTTP CONNECT request */
1341 BIO_printf(fbio, "\r\n");
1342
1343 for (;;) {
1344 if (BIO_flush(fbio) != 0)
1345 break;
1346 /* potentially needs to be retried if BIO is non-blocking */
1347 if (!BIO_should_retry(fbio))
1348 break;
1349 }
1350
1351 for (;;) {
1352 /* will not actually wait if timeout == 0 */
1353 rv = BIO_wait(fbio, max_time, 100 /* milliseconds */);
1354 if (rv <= 0) {
1355 BIO_printf(bio_err, "%s: HTTP CONNECT %s\n", prog,
1356 rv == 0 ? "timed out" : "failed waiting for data");
1357 goto end;
1358 }
1359
1360 /*-
1361 * The first line is the HTTP response.
1362 * According to RFC 7230, it is formatted exactly like this:
1363 * HTTP/d.d ddd reason text\r\n
1364 */
1365 read_len = BIO_gets(fbio, mbuf, BUF_SIZE);
1366 /* the BIO may not block, so we must wait for the 1st line to come in */
1367 if (read_len < (int)HTTP_LINE1_MINLEN)
1368 continue;
1369
1370 /* Check for HTTP/1.x */
1371 if (!HAS_PREFIX(mbuf, HTTP_PREFIX) != 0) {
1372 ERR_raise(ERR_LIB_HTTP, HTTP_R_HEADER_PARSE_ERROR);
1373 BIO_printf(bio_err, "%s: HTTP CONNECT failed, non-HTTP response\n",
1374 prog);
1375 /* Wrong protocol, not even HTTP, so stop reading headers */
1376 goto end;
1377 }
1378 mbufp = mbuf + strlen(HTTP_PREFIX);
1379 if (!HAS_PREFIX(mbufp, HTTP_VERSION_PATT) != 0) {
1380 ERR_raise(ERR_LIB_HTTP, HTTP_R_RECEIVED_WRONG_HTTP_VERSION);
1381 BIO_printf(bio_err,
1382 "%s: HTTP CONNECT failed, bad HTTP version %.*s\n",
1383 prog, (int)HTTP_VERSION_STR_LEN, mbufp);
1384 goto end;
1385 }
1386 mbufp += HTTP_VERSION_STR_LEN;
1387
1388 /* RFC 7231 4.3.6: any 2xx status code is valid */
1389 if (!HAS_PREFIX(mbufp, " 2")) {
1390 /* chop any trailing whitespace */
1391 while (read_len > 0 && ossl_isspace(mbuf[read_len - 1]))
1392 read_len--;
1393 mbuf[read_len] = '\0';
1394 ERR_raise_data(ERR_LIB_HTTP, HTTP_R_CONNECT_FAILURE,
1395 "reason=%s", mbufp);
1396 BIO_printf(bio_err, "%s: HTTP CONNECT failed, reason=%s\n",
1397 prog, mbufp);
1398 goto end;
1399 }
1400 ret = 1;
1401 break;
1402 }
1403
1404 /* Read past all following headers */
1405 do {
1406 /*
1407 * This does not necessarily catch the case when the full
1408 * HTTP response came in in more than a single TCP message.
1409 */
1410 read_len = BIO_gets(fbio, mbuf, BUF_SIZE);
1411 } while (read_len > 2);
1412
1413 end:
1414 if (fbio != NULL) {
1415 (void)BIO_flush(fbio);
1416 BIO_pop(fbio);
1417 BIO_free(fbio);
1418 }
1419 OPENSSL_free(mbuf);
1420 return ret;
1421#undef BUF_SIZE
1422}
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