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source: vbox/trunk/src/libs/openssl-3.0.3/crypto/http/http_client.c@ 95218

Last change on this file since 95218 was 94404, checked in by vboxsync, 3 years ago

libs/openssl: Update to 3.0.2 and switch to it, bugref:10128
File size: 46.4 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; /* Memory BIO holding request/response header */
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;
270
271 if (rctx == NULL || (req == NULL && content_type != NULL)) {
272 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER);
273 return 0;
274 }
275
276 if (rctx->keep_alive != 0
277 && !OSSL_HTTP_REQ_CTX_add1_header(rctx, "Connection", "keep-alive"))
278 return 0;
279
280 BIO_free(rctx->req);
281 rctx->req = NULL;
282 if (req == NULL)
283 return 1;
284 if (!rctx->method_POST) {
285 ERR_raise(ERR_LIB_HTTP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
286 return 0;
287 }
288
289 if (content_type != NULL
290 && BIO_printf(rctx->mem, "Content-Type: %s\r\n", content_type) <= 0)
291 return 0;
292
293 /* streaming BIO may not support querying size */
294 if (((req_len = BIO_ctrl(req, BIO_CTRL_INFO, 0, NULL)) <= 0
295 || BIO_printf(rctx->mem, "Content-Length: %ld\r\n", req_len) > 0)
296 && BIO_up_ref(req)) {
297 rctx->req = req;
298 return 1;
299 }
300 return 0;
301}
302
303int OSSL_HTTP_REQ_CTX_set1_req(OSSL_HTTP_REQ_CTX *rctx, const char *content_type,
304 const ASN1_ITEM *it, const ASN1_VALUE *req)
305{
306 BIO *mem = NULL;
307 int res = 1;
308
309 if (req != NULL)
310 res = (mem = ASN1_item_i2d_mem_bio(it, req)) != NULL;
311 res = res && set1_content(rctx, content_type, mem);
312 BIO_free(mem);
313 return res;
314}
315
316static int add1_headers(OSSL_HTTP_REQ_CTX *rctx,
317 const STACK_OF(CONF_VALUE) *headers, const char *host)
318{
319 int i;
320 int add_host = host != NULL && *host != '\0';
321 CONF_VALUE *hdr;
322
323 for (i = 0; i < sk_CONF_VALUE_num(headers); i++) {
324 hdr = sk_CONF_VALUE_value(headers, i);
325 if (add_host && strcasecmp("host", hdr->name) == 0)
326 add_host = 0;
327 if (!OSSL_HTTP_REQ_CTX_add1_header(rctx, hdr->name, hdr->value))
328 return 0;
329 }
330
331 if (add_host && !OSSL_HTTP_REQ_CTX_add1_header(rctx, "Host", host))
332 return 0;
333 return 1;
334}
335
336/* Create OSSL_HTTP_REQ_CTX structure using the values provided. */
337static OSSL_HTTP_REQ_CTX *http_req_ctx_new(int free_wbio, BIO *wbio, BIO *rbio,
338 OSSL_HTTP_bio_cb_t bio_update_fn,
339 void *arg, int use_ssl,
340 const char *proxy,
341 const char *server, const char *port,
342 int buf_size, int overall_timeout)
343{
344 OSSL_HTTP_REQ_CTX *rctx = OSSL_HTTP_REQ_CTX_new(wbio, rbio, buf_size);
345
346 if (rctx == NULL)
347 return NULL;
348 rctx->free_wbio = free_wbio;
349 rctx->upd_fn = bio_update_fn;
350 rctx->upd_arg = arg;
351 rctx->use_ssl = use_ssl;
352 if (proxy != NULL
353 && (rctx->proxy = OPENSSL_strdup(proxy)) == NULL)
354 goto err;
355 if (server != NULL
356 && (rctx->server = OPENSSL_strdup(server)) == NULL)
357 goto err;
358 if (port != NULL
359 && (rctx->port = OPENSSL_strdup(port)) == NULL)
360 goto err;
361 rctx->max_total_time =
362 overall_timeout > 0 ? time(NULL) + overall_timeout : 0;
363 return rctx;
364
365 err:
366 OSSL_HTTP_REQ_CTX_free(rctx);
367 return NULL;
368}
369
370/*
371 * Parse first HTTP response line. This should be like this: "HTTP/1.0 200 OK".
372 * We need to obtain the status code and (optional) informational message.
373 * Return any received HTTP response status code, or 0 on fatal error.
374 */
375
376static int parse_http_line1(char *line, int *found_keep_alive)
377{
378 int i, retcode, err;
379 char *code, *reason, *end;
380
381 if (!HAS_PREFIX(line, HTTP_PREFIX_VERSION))
382 goto err;
383 /* above HTTP 1.0, connection persistence is the default */
384 *found_keep_alive = line[strlen(HTTP_PREFIX_VERSION)] > '0';
385
386 /* Skip to first whitespace (past protocol info) */
387 for (code = line; *code != '\0' && !ossl_isspace(*code); code++)
388 continue;
389 if (*code == '\0')
390 goto err;
391
392 /* Skip past whitespace to start of response code */
393 while (*code != '\0' && ossl_isspace(*code))
394 code++;
395 if (*code == '\0')
396 goto err;
397
398 /* Find end of response code: first whitespace after start of code */
399 for (reason = code; *reason != '\0' && !ossl_isspace(*reason); reason++)
400 continue;
401
402 if (*reason == '\0')
403 goto err;
404
405 /* Set end of response code and start of message */
406 *reason++ = '\0';
407
408 /* Attempt to parse numeric code */
409 retcode = strtoul(code, &end, 10);
410 if (*end != '\0')
411 goto err;
412
413 /* Skip over any leading whitespace in message */
414 while (*reason != '\0' && ossl_isspace(*reason))
415 reason++;
416
417 if (*reason != '\0') {
418 /*
419 * Finally zap any trailing whitespace in message (include CRLF)
420 */
421
422 /* chop any trailing whitespace from reason */
423 /* We know reason has a non-whitespace character so this is OK */
424 for (end = reason + strlen(reason) - 1; ossl_isspace(*end); end--)
425 *end = '\0';
426 }
427
428 switch (retcode) {
429 case HTTP_STATUS_CODE_OK:
430 case HTTP_STATUS_CODE_MOVED_PERMANENTLY:
431 case HTTP_STATUS_CODE_FOUND:
432 return retcode;
433 default:
434 err = HTTP_R_RECEIVED_ERROR;
435 if (retcode < 400)
436 err = HTTP_R_STATUS_CODE_UNSUPPORTED;
437 if (*reason == '\0')
438 ERR_raise_data(ERR_LIB_HTTP, err, "code=%s", code);
439 else
440 ERR_raise_data(ERR_LIB_HTTP, err, "code=%s, reason=%s", code,
441 reason);
442 return retcode;
443 }
444
445 err:
446 for (i = 0; i < 60 && line[i] != '\0'; i++)
447 if (!ossl_isprint(line[i]))
448 line[i] = ' ';
449 line[i] = '\0';
450 ERR_raise_data(ERR_LIB_HTTP, HTTP_R_HEADER_PARSE_ERROR, "content=%s", line);
451 return 0;
452}
453
454static int check_set_resp_len(OSSL_HTTP_REQ_CTX *rctx, size_t len)
455{
456 if (rctx->max_resp_len != 0 && len > rctx->max_resp_len)
457 ERR_raise_data(ERR_LIB_HTTP, HTTP_R_MAX_RESP_LEN_EXCEEDED,
458 "length=%zu, max=%zu", len, rctx->max_resp_len);
459 if (rctx->resp_len != 0 && rctx->resp_len != len)
460 ERR_raise_data(ERR_LIB_HTTP, HTTP_R_INCONSISTENT_CONTENT_LENGTH,
461 "ASN.1 length=%zu, Content-Length=%zu",
462 len, rctx->resp_len);
463 rctx->resp_len = len;
464 return 1;
465}
466
467static int may_still_retry(time_t max_time, int *ptimeout)
468{
469 time_t time_diff, now = time(NULL);
470
471 if (max_time != 0) {
472 if (max_time < now) {
473 ERR_raise(ERR_LIB_HTTP, HTTP_R_RETRY_TIMEOUT);
474 return 0;
475 }
476 time_diff = max_time - now;
477 *ptimeout = time_diff > INT_MAX ? INT_MAX : (int)time_diff;
478 }
479 return 1;
480}
481
482/*
483 * Try exchanging request and response via HTTP on (non-)blocking BIO in rctx.
484 * Returns 1 on success, 0 on error or redirection, -1 on BIO_should_retry.
485 */
486int OSSL_HTTP_REQ_CTX_nbio(OSSL_HTTP_REQ_CTX *rctx)
487{
488 int i, found_expected_ct = 0, found_keep_alive = 0;
489 long n;
490 size_t resp_len;
491 const unsigned char *p;
492 char *buf, *key, *value, *line_end = NULL;
493
494 if (rctx == NULL) {
495 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER);
496 return 0;
497 }
498 if (rctx->mem == NULL || rctx->wbio == NULL || rctx->rbio == NULL) {
499 ERR_raise(ERR_LIB_HTTP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
500 return 0;
501 }
502
503 rctx->redirection_url = NULL;
504 next_io:
505 buf = (char *)rctx->buf;
506 if ((rctx->state & OHS_NOREAD) == 0) {
507 if (rctx->expect_asn1) {
508 n = BIO_read(rctx->rbio, rctx->buf, rctx->buf_size);
509 } else {
510 (void)ERR_set_mark();
511 n = BIO_gets(rctx->rbio, buf, rctx->buf_size);
512 if (n == -2) { /* unsupported method */
513 (void)ERR_pop_to_mark();
514 n = BIO_get_line(rctx->rbio, buf, rctx->buf_size);
515 } else {
516 (void)ERR_clear_last_mark();
517 }
518 }
519 if (n <= 0) {
520 if (BIO_should_retry(rctx->rbio))
521 return -1;
522 ERR_raise(ERR_LIB_HTTP, HTTP_R_FAILED_READING_DATA);
523 return 0;
524 }
525
526 /* Write data to memory BIO */
527 if (BIO_write(rctx->mem, rctx->buf, n) != n)
528 return 0;
529 }
530
531 switch (rctx->state) {
532 case OHS_ADD_HEADERS:
533 /* Last operation was adding headers: need a final \r\n */
534 if (BIO_write(rctx->mem, "\r\n", 2) != 2) {
535 rctx->state = OHS_ERROR;
536 return 0;
537 }
538 rctx->state = OHS_WRITE_INIT;
539
540 /* fall thru */
541 case OHS_WRITE_INIT:
542 rctx->len_to_send = BIO_get_mem_data(rctx->mem, &rctx->pos);
543 rctx->state = OHS_WRITE_HDR;
544
545 /* fall thru */
546 case OHS_WRITE_HDR:
547 /* Copy some chunk of data from rctx->mem to rctx->wbio */
548 case OHS_WRITE_REQ:
549 /* Copy some chunk of data from rctx->req to rctx->wbio */
550
551 if (rctx->len_to_send > 0) {
552 i = BIO_write(rctx->wbio, rctx->pos, rctx->len_to_send);
553 if (i <= 0) {
554 if (BIO_should_retry(rctx->wbio))
555 return -1;
556 rctx->state = OHS_ERROR;
557 return 0;
558 }
559 rctx->pos += i;
560 rctx->len_to_send -= i;
561 goto next_io;
562 }
563 if (rctx->state == OHS_WRITE_HDR) {
564 (void)BIO_reset(rctx->mem);
565 rctx->state = OHS_WRITE_REQ;
566 }
567 if (rctx->req != NULL && !BIO_eof(rctx->req)) {
568 n = BIO_read(rctx->req, rctx->buf, rctx->buf_size);
569 if (n <= 0) {
570 if (BIO_should_retry(rctx->rbio))
571 return -1;
572 ERR_raise(ERR_LIB_HTTP, HTTP_R_FAILED_READING_DATA);
573 return 0;
574 }
575 rctx->pos = rctx->buf;
576 rctx->len_to_send = n;
577 goto next_io;
578 }
579 rctx->state = OHS_FLUSH;
580
581 /* fall thru */
582 case OHS_FLUSH:
583
584 i = BIO_flush(rctx->wbio);
585
586 if (i > 0) {
587 rctx->state = OHS_FIRSTLINE;
588 goto next_io;
589 }
590
591 if (BIO_should_retry(rctx->wbio))
592 return -1;
593
594 rctx->state = OHS_ERROR;
595 return 0;
596
597 case OHS_ERROR:
598 return 0;
599
600 case OHS_FIRSTLINE:
601 case OHS_HEADERS:
602 case OHS_REDIRECT:
603
604 /* Attempt to read a line in */
605 next_line:
606 /*
607 * Due to strange memory BIO behavior with BIO_gets we have to check
608 * there's a complete line in there before calling BIO_gets or we'll
609 * just get a partial read.
610 */
611 n = BIO_get_mem_data(rctx->mem, &p);
612 if (n <= 0 || memchr(p, '\n', n) == 0) {
613 if (n >= rctx->buf_size) {
614 rctx->state = OHS_ERROR;
615 return 0;
616 }
617 goto next_io;
618 }
619 n = BIO_gets(rctx->mem, buf, rctx->buf_size);
620
621 if (n <= 0) {
622 if (BIO_should_retry(rctx->mem))
623 goto next_io;
624 rctx->state = OHS_ERROR;
625 return 0;
626 }
627
628 /* Don't allow excessive lines */
629 if (n == rctx->buf_size) {
630 ERR_raise(ERR_LIB_HTTP, HTTP_R_RESPONSE_LINE_TOO_LONG);
631 rctx->state = OHS_ERROR;
632 return 0;
633 }
634
635 /* First line */
636 if (rctx->state == OHS_FIRSTLINE) {
637 switch (parse_http_line1(buf, &found_keep_alive)) {
638 case HTTP_STATUS_CODE_OK:
639 rctx->state = OHS_HEADERS;
640 goto next_line;
641 case HTTP_STATUS_CODE_MOVED_PERMANENTLY:
642 case HTTP_STATUS_CODE_FOUND: /* i.e., moved temporarily */
643 if (!rctx->method_POST) { /* method is GET */
644 rctx->state = OHS_REDIRECT;
645 goto next_line;
646 }
647 ERR_raise(ERR_LIB_HTTP, HTTP_R_REDIRECTION_NOT_ENABLED);
648 /* redirection is not supported/recommended for POST */
649 /* fall through */
650 default:
651 rctx->state = OHS_ERROR;
652 goto next_line;
653 }
654 }
655 key = buf;
656 value = strchr(key, ':');
657 if (value != NULL) {
658 *(value++) = '\0';
659 while (ossl_isspace(*value))
660 value++;
661 line_end = strchr(value, '\r');
662 if (line_end == NULL)
663 line_end = strchr(value, '\n');
664 if (line_end != NULL)
665 *line_end = '\0';
666 }
667 if (value != NULL && line_end != NULL) {
668 if (rctx->state == OHS_REDIRECT
669 && strcasecmp(key, "Location") == 0) {
670 rctx->redirection_url = value;
671 return 0;
672 }
673 if (rctx->expected_ct != NULL
674 && strcasecmp(key, "Content-Type") == 0) {
675 if (strcasecmp(rctx->expected_ct, value) != 0) {
676 ERR_raise_data(ERR_LIB_HTTP, HTTP_R_UNEXPECTED_CONTENT_TYPE,
677 "expected=%s, actual=%s",
678 rctx->expected_ct, value);
679 return 0;
680 }
681 found_expected_ct = 1;
682 }
683
684 /* https://tools.ietf.org/html/rfc7230#section-6.3 Persistence */
685 if (strcasecmp(key, "Connection") == 0) {
686 if (strcasecmp(value, "keep-alive") == 0)
687 found_keep_alive = 1;
688 else if (strcasecmp(value, "close") == 0)
689 found_keep_alive = 0;
690 } else if (strcasecmp(key, "Content-Length") == 0) {
691 resp_len = (size_t)strtoul(value, &line_end, 10);
692 if (line_end == value || *line_end != '\0') {
693 ERR_raise_data(ERR_LIB_HTTP,
694 HTTP_R_ERROR_PARSING_CONTENT_LENGTH,
695 "input=%s", value);
696 return 0;
697 }
698 if (!check_set_resp_len(rctx, resp_len))
699 return 0;
700 }
701 }
702
703 /* Look for blank line indicating end of headers */
704 for (p = rctx->buf; *p != '\0'; p++) {
705 if (*p != '\r' && *p != '\n')
706 break;
707 }
708 if (*p != '\0') /* not end of headers */
709 goto next_line;
710
711 if (rctx->keep_alive != 0 /* do not let server initiate keep_alive */
712 && !found_keep_alive /* otherwise there is no change */) {
713 if (rctx->keep_alive == 2) {
714 rctx->keep_alive = 0;
715 ERR_raise(ERR_LIB_HTTP, HTTP_R_SERVER_CANCELED_CONNECTION);
716 return 0;
717 }
718 rctx->keep_alive = 0;
719 }
720
721 if (rctx->state == OHS_ERROR)
722 return 0;
723
724 if (rctx->expected_ct != NULL && !found_expected_ct) {
725 ERR_raise_data(ERR_LIB_HTTP, HTTP_R_MISSING_CONTENT_TYPE,
726 "expected=%s", rctx->expected_ct);
727 return 0;
728 }
729 if (rctx->state == OHS_REDIRECT) {
730 /* http status code indicated redirect but there was no Location */
731 ERR_raise(ERR_LIB_HTTP, HTTP_R_MISSING_REDIRECT_LOCATION);
732 return 0;
733 }
734
735 if (!rctx->expect_asn1) {
736 rctx->state = OHS_STREAM;
737 return 1;
738 }
739
740 rctx->state = OHS_ASN1_HEADER;
741
742 /* Fall thru */
743 case OHS_ASN1_HEADER:
744 /*
745 * Now reading ASN1 header: can read at least 2 bytes which is enough
746 * for ASN1 SEQUENCE header and either length field or at least the
747 * length of the length field.
748 */
749 n = BIO_get_mem_data(rctx->mem, &p);
750 if (n < 2)
751 goto next_io;
752
753 /* Check it is an ASN1 SEQUENCE */
754 if (*p++ != (V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED)) {
755 ERR_raise(ERR_LIB_HTTP, HTTP_R_MISSING_ASN1_ENCODING);
756 return 0;
757 }
758
759 /* Check out length field */
760 if ((*p & 0x80) != 0) {
761 /*
762 * If MSB set on initial length octet we can now always read 6
763 * octets: make sure we have them.
764 */
765 if (n < 6)
766 goto next_io;
767 n = *p & 0x7F;
768 /* Not NDEF or excessive length */
769 if (n == 0 || (n > 4)) {
770 ERR_raise(ERR_LIB_HTTP, HTTP_R_ERROR_PARSING_ASN1_LENGTH);
771 return 0;
772 }
773 p++;
774 resp_len = 0;
775 for (i = 0; i < n; i++) {
776 resp_len <<= 8;
777 resp_len |= *p++;
778 }
779 resp_len += n + 2;
780 } else {
781 resp_len = *p + 2;
782 }
783 if (!check_set_resp_len(rctx, resp_len))
784 return 0;
785
786 rctx->state = OHS_ASN1_CONTENT;
787
788 /* Fall thru */
789 case OHS_ASN1_CONTENT:
790 default:
791 n = BIO_get_mem_data(rctx->mem, NULL);
792 if (n < 0 || (size_t)n < rctx->resp_len)
793 goto next_io;
794
795 rctx->state = OHS_ASN1_DONE;
796 return 1;
797 }
798}
799
800int OSSL_HTTP_REQ_CTX_nbio_d2i(OSSL_HTTP_REQ_CTX *rctx,
801 ASN1_VALUE **pval, const ASN1_ITEM *it)
802{
803 const unsigned char *p;
804 int rv;
805
806 *pval = NULL;
807 if ((rv = OSSL_HTTP_REQ_CTX_nbio(rctx)) != 1)
808 return rv;
809 *pval = ASN1_item_d2i(NULL, &p, BIO_get_mem_data(rctx->mem, &p), it);
810 return *pval != NULL;
811
812}
813
814#ifndef OPENSSL_NO_SOCK
815
816/* set up a new connection BIO, to HTTP server or to HTTP(S) proxy if given */
817static BIO *http_new_bio(const char *server /* optionally includes ":port" */,
818 const char *server_port /* explicit server port */,
819 int use_ssl,
820 const char *proxy /* optionally includes ":port" */,
821 const char *proxy_port /* explicit proxy port */)
822{
823 const char *host = server;
824 const char *port = server_port;
825 BIO *cbio;
826
827 if (!ossl_assert(server != NULL))
828 return NULL;
829
830 if (proxy != NULL) {
831 host = proxy;
832 port = proxy_port;
833 }
834
835 if (port == NULL && strchr(host, ':') == NULL)
836 port = use_ssl ? OSSL_HTTPS_PORT : OSSL_HTTP_PORT;
837
838 cbio = BIO_new_connect(host /* optionally includes ":port" */);
839 if (cbio == NULL)
840 goto end;
841 if (port != NULL)
842 (void)BIO_set_conn_port(cbio, port);
843
844 end:
845 return cbio;
846}
847#endif /* OPENSSL_NO_SOCK */
848
849/* Exchange request and response via HTTP on (non-)blocking BIO */
850BIO *OSSL_HTTP_REQ_CTX_exchange(OSSL_HTTP_REQ_CTX *rctx)
851{
852 int rv;
853
854 if (rctx == NULL) {
855 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER);
856 return NULL;
857 }
858
859 for (;;) {
860 rv = OSSL_HTTP_REQ_CTX_nbio(rctx);
861 if (rv != -1)
862 break;
863 /* BIO_should_retry was true */
864 /* will not actually wait if rctx->max_time == 0 */
865 if (BIO_wait(rctx->rbio, rctx->max_time, 100 /* milliseconds */) <= 0)
866 return NULL;
867 }
868
869 if (rv == 0) {
870 if (rctx->redirection_url == NULL) { /* an error occurred */
871 if (rctx->len_to_send > 0)
872 ERR_raise(ERR_LIB_HTTP, HTTP_R_ERROR_SENDING);
873 else
874 ERR_raise(ERR_LIB_HTTP, HTTP_R_ERROR_RECEIVING);
875 }
876 return NULL;
877 }
878 return rctx->state == OHS_STREAM ? rctx->rbio : rctx->mem;
879}
880
881int OSSL_HTTP_is_alive(const OSSL_HTTP_REQ_CTX *rctx)
882{
883 return rctx != NULL && rctx->keep_alive != 0;
884}
885
886/* High-level HTTP API implementation */
887
888/* Initiate an HTTP session using bio, else use given server, proxy, etc. */
889OSSL_HTTP_REQ_CTX *OSSL_HTTP_open(const char *server, const char *port,
890 const char *proxy, const char *no_proxy,
891 int use_ssl, BIO *bio, BIO *rbio,
892 OSSL_HTTP_bio_cb_t bio_update_fn, void *arg,
893 int buf_size, int overall_timeout)
894{
895 BIO *cbio; /* == bio if supplied, used as connection BIO if rbio is NULL */
896 OSSL_HTTP_REQ_CTX *rctx = NULL;
897
898 if (use_ssl && bio_update_fn == NULL) {
899 ERR_raise(ERR_LIB_HTTP, HTTP_R_TLS_NOT_ENABLED);
900 return NULL;
901 }
902 if (rbio != NULL && (bio == NULL || bio_update_fn != NULL)) {
903 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_INVALID_ARGUMENT);
904 return NULL;
905 }
906
907 if (bio != NULL) {
908 cbio = bio;
909 if (proxy != NULL || no_proxy != NULL) {
910 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_INVALID_ARGUMENT);
911 return NULL;
912 }
913 } else {
914#ifndef OPENSSL_NO_SOCK
915 char *proxy_host = NULL, *proxy_port = NULL;
916
917 if (server == NULL) {
918 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER);
919 return NULL;
920 }
921 if (port != NULL && *port == '\0')
922 port = NULL;
923 if (port == NULL && strchr(server, ':') == NULL)
924 port = use_ssl ? OSSL_HTTPS_PORT : OSSL_HTTP_PORT;
925 proxy = OSSL_HTTP_adapt_proxy(proxy, no_proxy, server, use_ssl);
926 if (proxy != NULL
927 && !OSSL_HTTP_parse_url(proxy, NULL /* use_ssl */, NULL /* user */,
928 &proxy_host, &proxy_port, NULL /* num */,
929 NULL /* path */, NULL, NULL))
930 return NULL;
931 cbio = http_new_bio(server, port, use_ssl, proxy_host, proxy_port);
932 OPENSSL_free(proxy_host);
933 OPENSSL_free(proxy_port);
934 if (cbio == NULL)
935 return NULL;
936#else
937 ERR_raise(ERR_LIB_HTTP, HTTP_R_SOCK_NOT_SUPPORTED);
938 return NULL;
939#endif
940 }
941
942 (void)ERR_set_mark(); /* prepare removing any spurious libssl errors */
943 if (rbio == NULL && BIO_do_connect_retry(cbio, overall_timeout, -1) <= 0) {
944 if (bio == NULL) /* cbio was not provided by caller */
945 BIO_free_all(cbio);
946 goto end;
947 }
948 /* now overall_timeout is guaranteed to be >= 0 */
949
950 /* adapt in order to fix callback design flaw, see #17088 */
951 /* callback can be used to wrap or prepend TLS session */
952 if (bio_update_fn != NULL) {
953 BIO *orig_bio = cbio;
954
955 cbio = (*bio_update_fn)(cbio, arg, 1 /* connect */, use_ssl);
956 if (cbio == NULL) {
957 if (bio == NULL) /* cbio was not provided by caller */
958 BIO_free_all(orig_bio);
959 goto end;
960 }
961 }
962
963 rctx = http_req_ctx_new(bio == NULL, cbio, rbio != NULL ? rbio : cbio,
964 bio_update_fn, arg, use_ssl, proxy, server, port,
965 buf_size, overall_timeout);
966
967 end:
968 if (rctx != NULL)
969 /* remove any spurious error queue entries by ssl_add_cert_chain() */
970 (void)ERR_pop_to_mark();
971 else
972 (void)ERR_clear_last_mark();
973
974 return rctx;
975}
976
977int OSSL_HTTP_set1_request(OSSL_HTTP_REQ_CTX *rctx, const char *path,
978 const STACK_OF(CONF_VALUE) *headers,
979 const char *content_type, BIO *req,
980 const char *expected_content_type, int expect_asn1,
981 size_t max_resp_len, int timeout, int keep_alive)
982{
983 int use_http_proxy;
984
985 if (rctx == NULL) {
986 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER);
987 return 0;
988 }
989 use_http_proxy = rctx->proxy != NULL && !rctx->use_ssl;
990 if (use_http_proxy && rctx->server == NULL) {
991 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_INVALID_ARGUMENT);
992 return 0;
993 }
994 rctx->max_resp_len = max_resp_len; /* allows for 0: indefinite */
995
996 return OSSL_HTTP_REQ_CTX_set_request_line(rctx, req != NULL,
997 use_http_proxy ? rctx->server
998 : NULL, rctx->port, path)
999 && add1_headers(rctx, headers, rctx->server)
1000 && OSSL_HTTP_REQ_CTX_set_expected(rctx, expected_content_type,
1001 expect_asn1, timeout, keep_alive)
1002 && set1_content(rctx, content_type, req);
1003}
1004
1005/*-
1006 * Exchange single HTTP request and response according to rctx.
1007 * If rctx->method_POST then use POST, else use GET and ignore content_type.
1008 * The redirection_url output (freed by caller) parameter is used only for GET.
1009 */
1010BIO *OSSL_HTTP_exchange(OSSL_HTTP_REQ_CTX *rctx, char **redirection_url)
1011{
1012 BIO *resp;
1013
1014 if (rctx == NULL) {
1015 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER);
1016 return NULL;
1017 }
1018
1019 if (redirection_url != NULL)
1020 *redirection_url = NULL; /* do this beforehand to prevent dbl free */
1021
1022 resp = OSSL_HTTP_REQ_CTX_exchange(rctx);
1023 if (resp == NULL) {
1024 if (rctx->redirection_url != NULL) {
1025 if (redirection_url == NULL)
1026 ERR_raise(ERR_LIB_HTTP, HTTP_R_REDIRECTION_NOT_ENABLED);
1027 else
1028 /* may be NULL if out of memory: */
1029 *redirection_url = OPENSSL_strdup(rctx->redirection_url);
1030 } else {
1031 char buf[200];
1032 unsigned long err = ERR_peek_error();
1033 int lib = ERR_GET_LIB(err);
1034 int reason = ERR_GET_REASON(err);
1035
1036 if (lib == ERR_LIB_SSL || lib == ERR_LIB_HTTP
1037 || (lib == ERR_LIB_BIO && reason == BIO_R_CONNECT_TIMEOUT)
1038 || (lib == ERR_LIB_BIO && reason == BIO_R_CONNECT_ERROR)
1039#ifndef OPENSSL_NO_CMP
1040 || (lib == ERR_LIB_CMP
1041 && reason == CMP_R_POTENTIALLY_INVALID_CERTIFICATE)
1042#endif
1043 ) {
1044 if (rctx->server != NULL) {
1045 BIO_snprintf(buf, sizeof(buf), "server=http%s://%s%s%s",
1046 rctx->use_ssl ? "s" : "", rctx->server,
1047 rctx->port != NULL ? ":" : "",
1048 rctx->port != NULL ? rctx->port : "");
1049 ERR_add_error_data(1, buf);
1050 }
1051 if (rctx->proxy != NULL)
1052 ERR_add_error_data(2, " proxy=", rctx->proxy);
1053 if (err == 0) {
1054 BIO_snprintf(buf, sizeof(buf), " peer has disconnected%s",
1055 rctx->use_ssl ? " violating the protocol" :
1056 ", likely because it requires the use of TLS");
1057 ERR_add_error_data(1, buf);
1058 }
1059 }
1060 }
1061 }
1062
1063 if (resp != NULL && !BIO_up_ref(resp))
1064 resp = NULL;
1065 return resp;
1066}
1067
1068static int redirection_ok(int n_redir, const char *old_url, const char *new_url)
1069{
1070 if (n_redir >= HTTP_VERSION_MAX_REDIRECTIONS) {
1071 ERR_raise(ERR_LIB_HTTP, HTTP_R_TOO_MANY_REDIRECTIONS);
1072 return 0;
1073 }
1074 if (*new_url == '/') /* redirection to same server => same protocol */
1075 return 1;
1076 if (HAS_PREFIX(old_url, OSSL_HTTPS_NAME":") &&
1077 !HAS_PREFIX(new_url, OSSL_HTTPS_NAME":")) {
1078 ERR_raise(ERR_LIB_HTTP, HTTP_R_REDIRECTION_FROM_HTTPS_TO_HTTP);
1079 return 0;
1080 }
1081 return 1;
1082}
1083
1084/* Get data via HTTP from server at given URL, potentially with redirection */
1085BIO *OSSL_HTTP_get(const char *url, const char *proxy, const char *no_proxy,
1086 BIO *bio, BIO *rbio,
1087 OSSL_HTTP_bio_cb_t bio_update_fn, void *arg,
1088 int buf_size, const STACK_OF(CONF_VALUE) *headers,
1089 const char *expected_ct, int expect_asn1,
1090 size_t max_resp_len, int timeout)
1091{
1092 char *current_url, *redirection_url = NULL;
1093 int n_redirs = 0;
1094 char *host;
1095 char *port;
1096 char *path;
1097 int use_ssl;
1098 OSSL_HTTP_REQ_CTX *rctx;
1099 BIO *resp = NULL;
1100 time_t max_time = timeout > 0 ? time(NULL) + timeout : 0;
1101
1102 if (url == NULL) {
1103 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER);
1104 return NULL;
1105 }
1106 if ((current_url = OPENSSL_strdup(url)) == NULL)
1107 return NULL;
1108
1109 for (;;) {
1110 if (!OSSL_HTTP_parse_url(current_url, &use_ssl, NULL /* user */, &host,
1111 &port, NULL /* port_num */, &path, NULL, NULL))
1112 break;
1113
1114 rctx = OSSL_HTTP_open(host, port, proxy, no_proxy,
1115 use_ssl, bio, rbio, bio_update_fn, arg,
1116 buf_size, timeout);
1117 new_rpath:
1118 if (rctx != NULL) {
1119 if (!OSSL_HTTP_set1_request(rctx, path, headers,
1120 NULL /* content_type */,
1121 NULL /* req */,
1122 expected_ct, expect_asn1, max_resp_len,
1123 -1 /* use same max time (timeout) */,
1124 0 /* no keep_alive */))
1125 OSSL_HTTP_REQ_CTX_free(rctx);
1126 else
1127 resp = OSSL_HTTP_exchange(rctx, &redirection_url);
1128 }
1129 OPENSSL_free(path);
1130 if (resp == NULL && redirection_url != NULL) {
1131 if (redirection_ok(++n_redirs, current_url, redirection_url)
1132 && may_still_retry(max_time, &timeout)) {
1133 (void)BIO_reset(bio);
1134 OPENSSL_free(current_url);
1135 current_url = redirection_url;
1136 if (*redirection_url == '/') { /* redirection to same server */
1137 path = OPENSSL_strdup(redirection_url);
1138 goto new_rpath;
1139 }
1140 OPENSSL_free(host);
1141 OPENSSL_free(port);
1142 (void)OSSL_HTTP_close(rctx, 1);
1143 continue;
1144 }
1145 /* if redirection not allowed, ignore it */
1146 OPENSSL_free(redirection_url);
1147 }
1148 OPENSSL_free(host);
1149 OPENSSL_free(port);
1150 if (!OSSL_HTTP_close(rctx, resp != NULL)) {
1151 BIO_free(resp);
1152 resp = NULL;
1153 }
1154 break;
1155 }
1156 OPENSSL_free(current_url);
1157 return resp;
1158}
1159
1160/* Exchange request and response over a connection managed via |prctx| */
1161BIO *OSSL_HTTP_transfer(OSSL_HTTP_REQ_CTX **prctx,
1162 const char *server, const char *port,
1163 const char *path, int use_ssl,
1164 const char *proxy, const char *no_proxy,
1165 BIO *bio, BIO *rbio,
1166 OSSL_HTTP_bio_cb_t bio_update_fn, void *arg,
1167 int buf_size, const STACK_OF(CONF_VALUE) *headers,
1168 const char *content_type, BIO *req,
1169 const char *expected_ct, int expect_asn1,
1170 size_t max_resp_len, int timeout, int keep_alive)
1171{
1172 OSSL_HTTP_REQ_CTX *rctx = prctx == NULL ? NULL : *prctx;
1173 BIO *resp = NULL;
1174
1175 if (rctx == NULL) {
1176 rctx = OSSL_HTTP_open(server, port, proxy, no_proxy,
1177 use_ssl, bio, rbio, bio_update_fn, arg,
1178 buf_size, timeout);
1179 timeout = -1; /* Already set during opening the connection */
1180 }
1181 if (rctx != NULL) {
1182 if (OSSL_HTTP_set1_request(rctx, path, headers, content_type, req,
1183 expected_ct, expect_asn1,
1184 max_resp_len, timeout, keep_alive))
1185 resp = OSSL_HTTP_exchange(rctx, NULL);
1186 if (resp == NULL || !OSSL_HTTP_is_alive(rctx)) {
1187 if (!OSSL_HTTP_close(rctx, resp != NULL)) {
1188 BIO_free(resp);
1189 resp = NULL;
1190 }
1191 rctx = NULL;
1192 }
1193 }
1194 if (prctx != NULL)
1195 *prctx = rctx;
1196 return resp;
1197}
1198
1199int OSSL_HTTP_close(OSSL_HTTP_REQ_CTX *rctx, int ok)
1200{
1201 BIO *wbio;
1202 int ret = 1;
1203
1204 /* callback can be used to finish TLS session and free its BIO */
1205 if (rctx != NULL && rctx->upd_fn != NULL) {
1206 wbio = (*rctx->upd_fn)(rctx->wbio, rctx->upd_arg,
1207 0 /* disconnect */, ok);
1208 ret = wbio != NULL;
1209 if (ret)
1210 rctx->wbio = wbio;
1211 }
1212 OSSL_HTTP_REQ_CTX_free(rctx);
1213 return ret;
1214}
1215
1216/* BASE64 encoder used for encoding basic proxy authentication credentials */
1217static char *base64encode(const void *buf, size_t len)
1218{
1219 int i;
1220 size_t outl;
1221 char *out;
1222
1223 /* Calculate size of encoded data */
1224 outl = (len / 3);
1225 if (len % 3 > 0)
1226 outl++;
1227 outl <<= 2;
1228 out = OPENSSL_malloc(outl + 1);
1229 if (out == NULL)
1230 return 0;
1231
1232 i = EVP_EncodeBlock((unsigned char *)out, buf, len);
1233 if (!ossl_assert(0 <= i && (size_t)i <= outl)) {
1234 OPENSSL_free(out);
1235 return NULL;
1236 }
1237 return out;
1238}
1239
1240/*
1241 * Promote the given connection BIO using the CONNECT method for a TLS proxy.
1242 * This is typically called by an app, so bio_err and prog are used unless NULL
1243 * to print additional diagnostic information in a user-oriented way.
1244 */
1245int OSSL_HTTP_proxy_connect(BIO *bio, const char *server, const char *port,
1246 const char *proxyuser, const char *proxypass,
1247 int timeout, BIO *bio_err, const char *prog)
1248{
1249#undef BUF_SIZE
1250#define BUF_SIZE (8 * 1024)
1251 char *mbuf = OPENSSL_malloc(BUF_SIZE);
1252 char *mbufp;
1253 int read_len = 0;
1254 int ret = 0;
1255 BIO *fbio = BIO_new(BIO_f_buffer());
1256 int rv;
1257 time_t max_time = timeout > 0 ? time(NULL) + timeout : 0;
1258
1259 if (bio == NULL || server == NULL
1260 || (bio_err != NULL && prog == NULL)) {
1261 ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER);
1262 goto end;
1263 }
1264 if (port == NULL || *port == '\0')
1265 port = OSSL_HTTPS_PORT;
1266
1267 if (mbuf == NULL || fbio == NULL) {
1268 BIO_printf(bio_err /* may be NULL */, "%s: out of memory", prog);
1269 goto end;
1270 }
1271 BIO_push(fbio, bio);
1272
1273 BIO_printf(fbio, "CONNECT %s:%s "HTTP_1_0"\r\n", server, port);
1274
1275 /*
1276 * Workaround for broken proxies which would otherwise close
1277 * the connection when entering tunnel mode (e.g., Squid 2.6)
1278 */
1279 BIO_printf(fbio, "Proxy-Connection: Keep-Alive\r\n");
1280
1281 /* Support for basic (base64) proxy authentication */
1282 if (proxyuser != NULL) {
1283 size_t len = strlen(proxyuser) + 1;
1284 char *proxyauth, *proxyauthenc = NULL;
1285
1286 if (proxypass != NULL)
1287 len += strlen(proxypass);
1288 proxyauth = OPENSSL_malloc(len + 1);
1289 if (proxyauth == NULL)
1290 goto end;
1291 if (BIO_snprintf(proxyauth, len + 1, "%s:%s", proxyuser,
1292 proxypass != NULL ? proxypass : "") != (int)len)
1293 goto proxy_end;
1294 proxyauthenc = base64encode(proxyauth, len);
1295 if (proxyauthenc != NULL) {
1296 BIO_printf(fbio, "Proxy-Authorization: Basic %s\r\n", proxyauthenc);
1297 OPENSSL_clear_free(proxyauthenc, strlen(proxyauthenc));
1298 }
1299 proxy_end:
1300 OPENSSL_clear_free(proxyauth, len);
1301 if (proxyauthenc == NULL)
1302 goto end;
1303 }
1304
1305 /* Terminate the HTTP CONNECT request */
1306 BIO_printf(fbio, "\r\n");
1307
1308 for (;;) {
1309 if (BIO_flush(fbio) != 0)
1310 break;
1311 /* potentially needs to be retried if BIO is non-blocking */
1312 if (!BIO_should_retry(fbio))
1313 break;
1314 }
1315
1316 for (;;) {
1317 /* will not actually wait if timeout == 0 */
1318 rv = BIO_wait(fbio, max_time, 100 /* milliseconds */);
1319 if (rv <= 0) {
1320 BIO_printf(bio_err, "%s: HTTP CONNECT %s\n", prog,
1321 rv == 0 ? "timed out" : "failed waiting for data");
1322 goto end;
1323 }
1324
1325 /*-
1326 * The first line is the HTTP response.
1327 * According to RFC 7230, it is formatted exactly like this:
1328 * HTTP/d.d ddd reason text\r\n
1329 */
1330 read_len = BIO_gets(fbio, mbuf, BUF_SIZE);
1331 /* the BIO may not block, so we must wait for the 1st line to come in */
1332 if (read_len < (int)HTTP_LINE1_MINLEN)
1333 continue;
1334
1335 /* Check for HTTP/1.x */
1336 if (!HAS_PREFIX(mbuf, HTTP_PREFIX) != 0) {
1337 ERR_raise(ERR_LIB_HTTP, HTTP_R_HEADER_PARSE_ERROR);
1338 BIO_printf(bio_err, "%s: HTTP CONNECT failed, non-HTTP response\n",
1339 prog);
1340 /* Wrong protocol, not even HTTP, so stop reading headers */
1341 goto end;
1342 }
1343 mbufp = mbuf + strlen(HTTP_PREFIX);
1344 if (!HAS_PREFIX(mbufp, HTTP_VERSION_PATT) != 0) {
1345 ERR_raise(ERR_LIB_HTTP, HTTP_R_RECEIVED_WRONG_HTTP_VERSION);
1346 BIO_printf(bio_err,
1347 "%s: HTTP CONNECT failed, bad HTTP version %.*s\n",
1348 prog, (int)HTTP_VERSION_STR_LEN, mbufp);
1349 goto end;
1350 }
1351 mbufp += HTTP_VERSION_STR_LEN;
1352
1353 /* RFC 7231 4.3.6: any 2xx status code is valid */
1354 if (!HAS_PREFIX(mbufp, " 2")) {
1355 /* chop any trailing whitespace */
1356 while (read_len > 0 && ossl_isspace(mbuf[read_len - 1]))
1357 read_len--;
1358 mbuf[read_len] = '\0';
1359 ERR_raise_data(ERR_LIB_HTTP, HTTP_R_CONNECT_FAILURE,
1360 "reason=%s", mbufp);
1361 BIO_printf(bio_err, "%s: HTTP CONNECT failed, reason=%s\n",
1362 prog, mbufp);
1363 goto end;
1364 }
1365 ret = 1;
1366 break;
1367 }
1368
1369 /* Read past all following headers */
1370 do {
1371 /*
1372 * This does not necessarily catch the case when the full
1373 * HTTP response came in in more than a single TCP message.
1374 */
1375 read_len = BIO_gets(fbio, mbuf, BUF_SIZE);
1376 } while (read_len > 2);
1377
1378 end:
1379 if (fbio != NULL) {
1380 (void)BIO_flush(fbio);
1381 BIO_pop(fbio);
1382 BIO_free(fbio);
1383 }
1384 OPENSSL_free(mbuf);
1385 return ret;
1386#undef BUF_SIZE
1387}
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