| /* |
| * Copyright 2001-2021 The OpenSSL Project Authors. All Rights Reserved. |
| * Copyright Siemens AG 2018-2020 |
| * |
| * Licensed under the Apache License 2.0 (the "License"). You may not use |
| * this file except in compliance with the License. You can obtain a copy |
| * in the file LICENSE in the source distribution or at |
| * https://www.openssl.org/source/license.html |
| */ |
| |
| #include "internal/e_os.h" |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include "crypto/ctype.h" |
| #include <string.h> |
| #include <openssl/asn1.h> |
| #include <openssl/evp.h> |
| #include <openssl/err.h> |
| #include <openssl/httperr.h> |
| #include <openssl/cmperr.h> |
| #include <openssl/buffer.h> |
| #include <openssl/http.h> |
| #include "internal/sockets.h" |
| #include "internal/common.h" /* for ossl_assert() */ |
| |
| #define HTTP_PREFIX "HTTP/" |
| #define HTTP_VERSION_PATT "1." /* allow 1.x */ |
| #define HTTP_VERSION_STR_LEN sizeof(HTTP_VERSION_PATT) /* == strlen("1.0") */ |
| #define HTTP_PREFIX_VERSION HTTP_PREFIX""HTTP_VERSION_PATT |
| #define HTTP_1_0 HTTP_PREFIX_VERSION"0" /* "HTTP/1.0" */ |
| #define HTTP_LINE1_MINLEN (sizeof(HTTP_PREFIX_VERSION "x 200\n") - 1) |
| #define HTTP_VERSION_MAX_REDIRECTIONS 50 |
| |
| #define HTTP_STATUS_CODE_OK 200 |
| #define HTTP_STATUS_CODE_MOVED_PERMANENTLY 301 |
| #define HTTP_STATUS_CODE_FOUND 302 |
| |
| /* Stateful HTTP request code, supporting blocking and non-blocking I/O */ |
| |
| /* Opaque HTTP request status structure */ |
| |
| struct ossl_http_req_ctx_st { |
| int state; /* Current I/O state */ |
| unsigned char *buf; /* Buffer to write request or read response */ |
| int buf_size; /* Buffer size */ |
| int free_wbio; /* wbio allocated internally, free with ctx */ |
| BIO *wbio; /* BIO to write/send request to */ |
| BIO *rbio; /* BIO to read/receive response from */ |
| OSSL_HTTP_bio_cb_t upd_fn; /* Optional BIO update callback used for TLS */ |
| void *upd_arg; /* Optional arg for update callback function */ |
| int use_ssl; /* Use HTTPS */ |
| char *proxy; /* Optional proxy name or URI */ |
| char *server; /* Optional server host name */ |
| char *port; /* Optional server port */ |
| BIO *mem; /* Memory BIO holding request/response header */ |
| BIO *req; /* BIO holding the request provided by caller */ |
| int method_POST; /* HTTP method is POST (else GET) */ |
| char *expected_ct; /* Optional expected Content-Type */ |
| int expect_asn1; /* Response must be ASN.1-encoded */ |
| unsigned char *pos; /* Current position sending data */ |
| long len_to_send; /* Number of bytes still to send */ |
| size_t resp_len; /* Length of response */ |
| size_t max_resp_len; /* Maximum length of response, or 0 */ |
| int keep_alive; /* Persistent conn. 0=no, 1=prefer, 2=require */ |
| time_t max_time; /* Maximum end time of current transfer, or 0 */ |
| time_t max_total_time; /* Maximum end time of total transfer, or 0 */ |
| char *redirection_url; /* Location obtained from HTTP status 301/302 */ |
| }; |
| |
| /* HTTP states */ |
| |
| #define OHS_NOREAD 0x1000 /* If set no reading should be performed */ |
| #define OHS_ERROR (0 | OHS_NOREAD) /* Error condition */ |
| #define OHS_ADD_HEADERS (1 | OHS_NOREAD) /* Adding header lines to request */ |
| #define OHS_WRITE_INIT (2 | OHS_NOREAD) /* 1st call: ready to start send */ |
| #define OHS_WRITE_HDR (3 | OHS_NOREAD) /* Request header being sent */ |
| #define OHS_WRITE_REQ (4 | OHS_NOREAD) /* Request contents being sent */ |
| #define OHS_FLUSH (5 | OHS_NOREAD) /* Request being flushed */ |
| #define OHS_FIRSTLINE 1 /* First line of response being read */ |
| #define OHS_HEADERS 2 /* MIME headers of response being read */ |
| #define OHS_REDIRECT 3 /* MIME headers being read, expecting Location */ |
| #define OHS_ASN1_HEADER 4 /* ASN1 sequence header (tag+length) being read */ |
| #define OHS_ASN1_CONTENT 5 /* ASN1 content octets being read */ |
| #define OHS_ASN1_DONE (6 | OHS_NOREAD) /* ASN1 content read completed */ |
| #define OHS_STREAM (7 | OHS_NOREAD) /* HTTP content stream to be read */ |
| |
| /* Low-level HTTP API implementation */ |
| |
| OSSL_HTTP_REQ_CTX *OSSL_HTTP_REQ_CTX_new(BIO *wbio, BIO *rbio, int buf_size) |
| { |
| OSSL_HTTP_REQ_CTX *rctx; |
| |
| if (wbio == NULL || rbio == NULL) { |
| ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); |
| return NULL; |
| } |
| |
| if ((rctx = OPENSSL_zalloc(sizeof(*rctx))) == NULL) |
| return NULL; |
| rctx->state = OHS_ERROR; |
| rctx->buf_size = buf_size > 0 ? buf_size : OSSL_HTTP_DEFAULT_MAX_LINE_LEN; |
| rctx->buf = OPENSSL_malloc(rctx->buf_size); |
| rctx->wbio = wbio; |
| rctx->rbio = rbio; |
| if (rctx->buf == NULL) { |
| OPENSSL_free(rctx); |
| return NULL; |
| } |
| rctx->max_resp_len = OSSL_HTTP_DEFAULT_MAX_RESP_LEN; |
| /* everything else is 0, e.g. rctx->len_to_send, or NULL, e.g. rctx->mem */ |
| return rctx; |
| } |
| |
| void OSSL_HTTP_REQ_CTX_free(OSSL_HTTP_REQ_CTX *rctx) |
| { |
| if (rctx == NULL) |
| return; |
| /* |
| * Use BIO_free_all() because bio_update_fn may prepend or append to cbio. |
| * This also frees any (e.g., SSL/TLS) BIOs linked with bio and, |
| * like BIO_reset(bio), calls SSL_shutdown() to notify/alert the peer. |
| */ |
| if (rctx->free_wbio) |
| BIO_free_all(rctx->wbio); |
| /* do not free rctx->rbio */ |
| BIO_free(rctx->mem); |
| BIO_free(rctx->req); |
| OPENSSL_free(rctx->buf); |
| OPENSSL_free(rctx->proxy); |
| OPENSSL_free(rctx->server); |
| OPENSSL_free(rctx->port); |
| OPENSSL_free(rctx->expected_ct); |
| OPENSSL_free(rctx); |
| } |
| |
| BIO *OSSL_HTTP_REQ_CTX_get0_mem_bio(const OSSL_HTTP_REQ_CTX *rctx) |
| { |
| if (rctx == NULL) { |
| ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); |
| return NULL; |
| } |
| return rctx->mem; |
| } |
| |
| size_t OSSL_HTTP_REQ_CTX_get_resp_len(const OSSL_HTTP_REQ_CTX *rctx) |
| { |
| if (rctx == NULL) { |
| ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); |
| return 0; |
| } |
| return rctx->resp_len; |
| } |
| |
| void OSSL_HTTP_REQ_CTX_set_max_response_length(OSSL_HTTP_REQ_CTX *rctx, |
| unsigned long len) |
| { |
| if (rctx == NULL) { |
| ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); |
| return; |
| } |
| rctx->max_resp_len = len != 0 ? (size_t)len : OSSL_HTTP_DEFAULT_MAX_RESP_LEN; |
| } |
| |
| /* |
| * Create request line using |rctx| and |path| (or "/" in case |path| is NULL). |
| * Server name (and port) must be given if and only if plain HTTP proxy is used. |
| */ |
| int OSSL_HTTP_REQ_CTX_set_request_line(OSSL_HTTP_REQ_CTX *rctx, int method_POST, |
| const char *server, const char *port, |
| const char *path) |
| { |
| if (rctx == NULL) { |
| ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); |
| return 0; |
| } |
| BIO_free(rctx->mem); |
| if ((rctx->mem = BIO_new(BIO_s_mem())) == NULL) |
| return 0; |
| |
| rctx->method_POST = method_POST != 0; |
| if (BIO_printf(rctx->mem, "%s ", rctx->method_POST ? "POST" : "GET") <= 0) |
| return 0; |
| |
| if (server != NULL) { /* HTTP (but not HTTPS) proxy is used */ |
| /* |
| * Section 5.1.2 of RFC 1945 states that the absoluteURI form is only |
| * allowed when using a proxy |
| */ |
| if (BIO_printf(rctx->mem, OSSL_HTTP_PREFIX"%s", server) <= 0) |
| return 0; |
| if (port != NULL && BIO_printf(rctx->mem, ":%s", port) <= 0) |
| return 0; |
| } |
| |
| /* Make sure path includes a forward slash */ |
| if (path == NULL) |
| path = "/"; |
| if (path[0] != '/' && BIO_printf(rctx->mem, "/") <= 0) |
| return 0; |
| /* |
| * Add (the rest of) the path and the HTTP version, |
| * which is fixed to 1.0 for straightforward implementation of keep-alive |
| */ |
| if (BIO_printf(rctx->mem, "%s "HTTP_1_0"\r\n", path) <= 0) |
| return 0; |
| |
| rctx->resp_len = 0; |
| rctx->state = OHS_ADD_HEADERS; |
| return 1; |
| } |
| |
| int OSSL_HTTP_REQ_CTX_add1_header(OSSL_HTTP_REQ_CTX *rctx, |
| const char *name, const char *value) |
| { |
| if (rctx == NULL || name == NULL) { |
| ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); |
| return 0; |
| } |
| if (rctx->mem == NULL) { |
| ERR_raise(ERR_LIB_HTTP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
| return 0; |
| } |
| |
| if (BIO_puts(rctx->mem, name) <= 0) |
| return 0; |
| if (value != NULL) { |
| if (BIO_write(rctx->mem, ": ", 2) != 2) |
| return 0; |
| if (BIO_puts(rctx->mem, value) <= 0) |
| return 0; |
| } |
| return BIO_write(rctx->mem, "\r\n", 2) == 2; |
| } |
| |
| int OSSL_HTTP_REQ_CTX_set_expected(OSSL_HTTP_REQ_CTX *rctx, |
| const char *content_type, int asn1, |
| int timeout, int keep_alive) |
| { |
| if (rctx == NULL) { |
| ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); |
| return 0; |
| } |
| if (keep_alive != 0 |
| && rctx->state != OHS_ERROR && rctx->state != OHS_ADD_HEADERS) { |
| /* Cannot anymore set keep-alive in request header */ |
| ERR_raise(ERR_LIB_HTTP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
| return 0; |
| } |
| |
| OPENSSL_free(rctx->expected_ct); |
| rctx->expected_ct = NULL; |
| if (content_type != NULL |
| && (rctx->expected_ct = OPENSSL_strdup(content_type)) == NULL) |
| return 0; |
| |
| rctx->expect_asn1 = asn1; |
| if (timeout >= 0) |
| rctx->max_time = timeout > 0 ? time(NULL) + timeout : 0; |
| else /* take over any |overall_timeout| arg of OSSL_HTTP_open(), else 0 */ |
| rctx->max_time = rctx->max_total_time; |
| rctx->keep_alive = keep_alive; |
| return 1; |
| } |
| |
| static int set1_content(OSSL_HTTP_REQ_CTX *rctx, |
| const char *content_type, BIO *req) |
| { |
| long req_len; |
| |
| if (rctx == NULL || (req == NULL && content_type != NULL)) { |
| ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); |
| return 0; |
| } |
| |
| if (rctx->keep_alive != 0 |
| && !OSSL_HTTP_REQ_CTX_add1_header(rctx, "Connection", "keep-alive")) |
| return 0; |
| |
| BIO_free(rctx->req); |
| rctx->req = NULL; |
| if (req == NULL) |
| return 1; |
| if (!rctx->method_POST) { |
| ERR_raise(ERR_LIB_HTTP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
| return 0; |
| } |
| |
| if (content_type != NULL |
| && BIO_printf(rctx->mem, "Content-Type: %s\r\n", content_type) <= 0) |
| return 0; |
| |
| /* streaming BIO may not support querying size */ |
| if (((req_len = BIO_ctrl(req, BIO_CTRL_INFO, 0, NULL)) <= 0 |
| || BIO_printf(rctx->mem, "Content-Length: %ld\r\n", req_len) > 0) |
| && BIO_up_ref(req)) { |
| rctx->req = req; |
| return 1; |
| } |
| return 0; |
| } |
| |
| int OSSL_HTTP_REQ_CTX_set1_req(OSSL_HTTP_REQ_CTX *rctx, const char *content_type, |
| const ASN1_ITEM *it, const ASN1_VALUE *req) |
| { |
| BIO *mem = NULL; |
| int res = 1; |
| |
| if (req != NULL) |
| res = (mem = ASN1_item_i2d_mem_bio(it, req)) != NULL; |
| res = res && set1_content(rctx, content_type, mem); |
| BIO_free(mem); |
| return res; |
| } |
| |
| static int add1_headers(OSSL_HTTP_REQ_CTX *rctx, |
| const STACK_OF(CONF_VALUE) *headers, const char *host) |
| { |
| int i; |
| int add_host = host != NULL && *host != '\0'; |
| CONF_VALUE *hdr; |
| |
| for (i = 0; i < sk_CONF_VALUE_num(headers); i++) { |
| hdr = sk_CONF_VALUE_value(headers, i); |
| if (add_host && OPENSSL_strcasecmp("host", hdr->name) == 0) |
| add_host = 0; |
| if (!OSSL_HTTP_REQ_CTX_add1_header(rctx, hdr->name, hdr->value)) |
| return 0; |
| } |
| |
| if (add_host && !OSSL_HTTP_REQ_CTX_add1_header(rctx, "Host", host)) |
| return 0; |
| return 1; |
| } |
| |
| /* Create OSSL_HTTP_REQ_CTX structure using the values provided. */ |
| static OSSL_HTTP_REQ_CTX *http_req_ctx_new(int free_wbio, BIO *wbio, BIO *rbio, |
| OSSL_HTTP_bio_cb_t bio_update_fn, |
| void *arg, int use_ssl, |
| const char *proxy, |
| const char *server, const char *port, |
| int buf_size, int overall_timeout) |
| { |
| OSSL_HTTP_REQ_CTX *rctx = OSSL_HTTP_REQ_CTX_new(wbio, rbio, buf_size); |
| |
| if (rctx == NULL) |
| return NULL; |
| rctx->free_wbio = free_wbio; |
| rctx->upd_fn = bio_update_fn; |
| rctx->upd_arg = arg; |
| rctx->use_ssl = use_ssl; |
| if (proxy != NULL |
| && (rctx->proxy = OPENSSL_strdup(proxy)) == NULL) |
| goto err; |
| if (server != NULL |
| && (rctx->server = OPENSSL_strdup(server)) == NULL) |
| goto err; |
| if (port != NULL |
| && (rctx->port = OPENSSL_strdup(port)) == NULL) |
| goto err; |
| rctx->max_total_time = |
| overall_timeout > 0 ? time(NULL) + overall_timeout : 0; |
| return rctx; |
| |
| err: |
| OSSL_HTTP_REQ_CTX_free(rctx); |
| return NULL; |
| } |
| |
| /* |
| * Parse first HTTP response line. This should be like this: "HTTP/1.0 200 OK". |
| * We need to obtain the status code and (optional) informational message. |
| * Return any received HTTP response status code, or 0 on fatal error. |
| */ |
| |
| static int parse_http_line1(char *line, int *found_keep_alive) |
| { |
| int i, retcode, err; |
| char *code, *reason, *end; |
| |
| if (!CHECK_AND_SKIP_PREFIX(line, HTTP_PREFIX_VERSION)) |
| goto err; |
| /* above HTTP 1.0, connection persistence is the default */ |
| *found_keep_alive = *line > '0'; |
| |
| /* Skip to first whitespace (past protocol info) */ |
| for (code = line; *code != '\0' && !ossl_isspace(*code); code++) |
| continue; |
| if (*code == '\0') |
| goto err; |
| |
| /* Skip past whitespace to start of response code */ |
| while (*code != '\0' && ossl_isspace(*code)) |
| code++; |
| if (*code == '\0') |
| goto err; |
| |
| /* Find end of response code: first whitespace after start of code */ |
| for (reason = code; *reason != '\0' && !ossl_isspace(*reason); reason++) |
| continue; |
| |
| if (*reason == '\0') |
| goto err; |
| |
| /* Set end of response code and start of message */ |
| *reason++ = '\0'; |
| |
| /* Attempt to parse numeric code */ |
| retcode = strtoul(code, &end, 10); |
| if (*end != '\0') |
| goto err; |
| |
| /* Skip over any leading whitespace in message */ |
| while (*reason != '\0' && ossl_isspace(*reason)) |
| reason++; |
| |
| if (*reason != '\0') { |
| /* |
| * Finally zap any trailing whitespace in message (include CRLF) |
| */ |
| |
| /* chop any trailing whitespace from reason */ |
| /* We know reason has a non-whitespace character so this is OK */ |
| for (end = reason + strlen(reason) - 1; ossl_isspace(*end); end--) |
| *end = '\0'; |
| } |
| |
| switch (retcode) { |
| case HTTP_STATUS_CODE_OK: |
| case HTTP_STATUS_CODE_MOVED_PERMANENTLY: |
| case HTTP_STATUS_CODE_FOUND: |
| return retcode; |
| default: |
| err = HTTP_R_RECEIVED_ERROR; |
| if (retcode < 400) |
| err = HTTP_R_STATUS_CODE_UNSUPPORTED; |
| if (*reason == '\0') |
| ERR_raise_data(ERR_LIB_HTTP, err, "code=%s", code); |
| else |
| ERR_raise_data(ERR_LIB_HTTP, err, "code=%s, reason=%s", code, |
| reason); |
| return retcode; |
| } |
| |
| err: |
| for (i = 0; i < 60 && line[i] != '\0'; i++) |
| if (!ossl_isprint(line[i])) |
| line[i] = ' '; |
| line[i] = '\0'; |
| ERR_raise_data(ERR_LIB_HTTP, HTTP_R_HEADER_PARSE_ERROR, "content=%s", line); |
| return 0; |
| } |
| |
| static int check_set_resp_len(OSSL_HTTP_REQ_CTX *rctx, size_t len) |
| { |
| if (rctx->max_resp_len != 0 && len > rctx->max_resp_len) |
| ERR_raise_data(ERR_LIB_HTTP, HTTP_R_MAX_RESP_LEN_EXCEEDED, |
| "length=%zu, max=%zu", len, rctx->max_resp_len); |
| if (rctx->resp_len != 0 && rctx->resp_len != len) |
| ERR_raise_data(ERR_LIB_HTTP, HTTP_R_INCONSISTENT_CONTENT_LENGTH, |
| "ASN.1 length=%zu, Content-Length=%zu", |
| len, rctx->resp_len); |
| rctx->resp_len = len; |
| return 1; |
| } |
| |
| static int may_still_retry(time_t max_time, int *ptimeout) |
| { |
| time_t time_diff, now = time(NULL); |
| |
| if (max_time != 0) { |
| if (max_time < now) { |
| ERR_raise(ERR_LIB_HTTP, HTTP_R_RETRY_TIMEOUT); |
| return 0; |
| } |
| time_diff = max_time - now; |
| *ptimeout = time_diff > INT_MAX ? INT_MAX : (int)time_diff; |
| } |
| return 1; |
| } |
| |
| /* |
| * Try exchanging request and response via HTTP on (non-)blocking BIO in rctx. |
| * Returns 1 on success, 0 on error or redirection, -1 on BIO_should_retry. |
| */ |
| int OSSL_HTTP_REQ_CTX_nbio(OSSL_HTTP_REQ_CTX *rctx) |
| { |
| int i, found_expected_ct = 0, found_keep_alive = 0; |
| long n; |
| size_t resp_len; |
| const unsigned char *p; |
| char *buf, *key, *value, *line_end = NULL; |
| |
| if (rctx == NULL) { |
| ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); |
| return 0; |
| } |
| if (rctx->mem == NULL || rctx->wbio == NULL || rctx->rbio == NULL) { |
| ERR_raise(ERR_LIB_HTTP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
| return 0; |
| } |
| |
| rctx->redirection_url = NULL; |
| next_io: |
| buf = (char *)rctx->buf; |
| if ((rctx->state & OHS_NOREAD) == 0) { |
| if (rctx->expect_asn1) { |
| n = BIO_read(rctx->rbio, rctx->buf, rctx->buf_size); |
| } else { |
| (void)ERR_set_mark(); |
| n = BIO_gets(rctx->rbio, buf, rctx->buf_size); |
| if (n == -2) { /* some BIOs, such as SSL, do not support "gets" */ |
| (void)ERR_pop_to_mark(); |
| n = BIO_get_line(rctx->rbio, buf, rctx->buf_size); |
| } else { |
| (void)ERR_clear_last_mark(); |
| } |
| } |
| if (n <= 0) { |
| if (BIO_should_retry(rctx->rbio)) |
| return -1; |
| ERR_raise(ERR_LIB_HTTP, HTTP_R_FAILED_READING_DATA); |
| return 0; |
| } |
| |
| /* Write data to memory BIO */ |
| if (BIO_write(rctx->mem, rctx->buf, n) != n) |
| return 0; |
| } |
| |
| switch (rctx->state) { |
| case OHS_ADD_HEADERS: |
| /* Last operation was adding headers: need a final \r\n */ |
| if (BIO_write(rctx->mem, "\r\n", 2) != 2) { |
| rctx->state = OHS_ERROR; |
| return 0; |
| } |
| rctx->state = OHS_WRITE_INIT; |
| |
| /* fall thru */ |
| case OHS_WRITE_INIT: |
| rctx->len_to_send = BIO_get_mem_data(rctx->mem, &rctx->pos); |
| rctx->state = OHS_WRITE_HDR; |
| |
| /* fall thru */ |
| case OHS_WRITE_HDR: |
| /* Copy some chunk of data from rctx->mem to rctx->wbio */ |
| case OHS_WRITE_REQ: |
| /* Copy some chunk of data from rctx->req to rctx->wbio */ |
| |
| if (rctx->len_to_send > 0) { |
| i = BIO_write(rctx->wbio, rctx->pos, rctx->len_to_send); |
| if (i <= 0) { |
| if (BIO_should_retry(rctx->wbio)) |
| return -1; |
| rctx->state = OHS_ERROR; |
| return 0; |
| } |
| rctx->pos += i; |
| rctx->len_to_send -= i; |
| goto next_io; |
| } |
| if (rctx->state == OHS_WRITE_HDR) { |
| (void)BIO_reset(rctx->mem); |
| rctx->state = OHS_WRITE_REQ; |
| } |
| if (rctx->req != NULL && !BIO_eof(rctx->req)) { |
| n = BIO_read(rctx->req, rctx->buf, rctx->buf_size); |
| if (n <= 0) { |
| if (BIO_should_retry(rctx->rbio)) |
| return -1; |
| ERR_raise(ERR_LIB_HTTP, HTTP_R_FAILED_READING_DATA); |
| return 0; |
| } |
| rctx->pos = rctx->buf; |
| rctx->len_to_send = n; |
| goto next_io; |
| } |
| rctx->state = OHS_FLUSH; |
| |
| /* fall thru */ |
| case OHS_FLUSH: |
| |
| i = BIO_flush(rctx->wbio); |
| |
| if (i > 0) { |
| rctx->state = OHS_FIRSTLINE; |
| goto next_io; |
| } |
| |
| if (BIO_should_retry(rctx->wbio)) |
| return -1; |
| |
| rctx->state = OHS_ERROR; |
| return 0; |
| |
| case OHS_ERROR: |
| return 0; |
| |
| case OHS_FIRSTLINE: |
| case OHS_HEADERS: |
| case OHS_REDIRECT: |
| |
| /* Attempt to read a line in */ |
| next_line: |
| /* |
| * Due to strange memory BIO behavior with BIO_gets we have to check |
| * there's a complete line in there before calling BIO_gets or we'll |
| * just get a partial read. |
| */ |
| n = BIO_get_mem_data(rctx->mem, &p); |
| if (n <= 0 || memchr(p, '\n', n) == 0) { |
| if (n >= rctx->buf_size) { |
| rctx->state = OHS_ERROR; |
| return 0; |
| } |
| goto next_io; |
| } |
| n = BIO_gets(rctx->mem, buf, rctx->buf_size); |
| |
| if (n <= 0) { |
| if (BIO_should_retry(rctx->mem)) |
| goto next_io; |
| rctx->state = OHS_ERROR; |
| return 0; |
| } |
| |
| /* Don't allow excessive lines */ |
| if (n == rctx->buf_size) { |
| ERR_raise(ERR_LIB_HTTP, HTTP_R_RESPONSE_LINE_TOO_LONG); |
| rctx->state = OHS_ERROR; |
| return 0; |
| } |
| |
| /* First line */ |
| if (rctx->state == OHS_FIRSTLINE) { |
| switch (parse_http_line1(buf, &found_keep_alive)) { |
| case HTTP_STATUS_CODE_OK: |
| rctx->state = OHS_HEADERS; |
| goto next_line; |
| case HTTP_STATUS_CODE_MOVED_PERMANENTLY: |
| case HTTP_STATUS_CODE_FOUND: /* i.e., moved temporarily */ |
| if (!rctx->method_POST) { /* method is GET */ |
| rctx->state = OHS_REDIRECT; |
| goto next_line; |
| } |
| ERR_raise(ERR_LIB_HTTP, HTTP_R_REDIRECTION_NOT_ENABLED); |
| /* redirection is not supported/recommended for POST */ |
| /* fall through */ |
| default: |
| rctx->state = OHS_ERROR; |
| goto next_line; |
| } |
| } |
| key = buf; |
| value = strchr(key, ':'); |
| if (value != NULL) { |
| *(value++) = '\0'; |
| while (ossl_isspace(*value)) |
| value++; |
| line_end = strchr(value, '\r'); |
| if (line_end == NULL) |
| line_end = strchr(value, '\n'); |
| if (line_end != NULL) |
| *line_end = '\0'; |
| } |
| if (value != NULL && line_end != NULL) { |
| if (rctx->state == OHS_REDIRECT |
| && OPENSSL_strcasecmp(key, "Location") == 0) { |
| rctx->redirection_url = value; |
| return 0; |
| } |
| if (rctx->state == OHS_HEADERS && rctx->expected_ct != NULL |
| && OPENSSL_strcasecmp(key, "Content-Type") == 0) { |
| if (OPENSSL_strcasecmp(rctx->expected_ct, value) != 0) { |
| ERR_raise_data(ERR_LIB_HTTP, HTTP_R_UNEXPECTED_CONTENT_TYPE, |
| "expected=%s, actual=%s", |
| rctx->expected_ct, value); |
| return 0; |
| } |
| found_expected_ct = 1; |
| } |
| |
| /* https://tools.ietf.org/html/rfc7230#section-6.3 Persistence */ |
| if (OPENSSL_strcasecmp(key, "Connection") == 0) { |
| if (OPENSSL_strcasecmp(value, "keep-alive") == 0) |
| found_keep_alive = 1; |
| else if (OPENSSL_strcasecmp(value, "close") == 0) |
| found_keep_alive = 0; |
| } else if (OPENSSL_strcasecmp(key, "Content-Length") == 0) { |
| resp_len = (size_t)strtoul(value, &line_end, 10); |
| if (line_end == value || *line_end != '\0') { |
| ERR_raise_data(ERR_LIB_HTTP, |
| HTTP_R_ERROR_PARSING_CONTENT_LENGTH, |
| "input=%s", value); |
| return 0; |
| } |
| if (!check_set_resp_len(rctx, resp_len)) |
| return 0; |
| } |
| } |
| |
| /* Look for blank line indicating end of headers */ |
| for (p = rctx->buf; *p != '\0'; p++) { |
| if (*p != '\r' && *p != '\n') |
| break; |
| } |
| if (*p != '\0') /* not end of headers */ |
| goto next_line; |
| |
| if (rctx->keep_alive != 0 /* do not let server initiate keep_alive */ |
| && !found_keep_alive /* otherwise there is no change */) { |
| if (rctx->keep_alive == 2) { |
| rctx->keep_alive = 0; |
| ERR_raise(ERR_LIB_HTTP, HTTP_R_SERVER_CANCELED_CONNECTION); |
| return 0; |
| } |
| rctx->keep_alive = 0; |
| } |
| |
| if (rctx->state == OHS_ERROR) |
| return 0; |
| |
| if (rctx->expected_ct != NULL && !found_expected_ct) { |
| ERR_raise_data(ERR_LIB_HTTP, HTTP_R_MISSING_CONTENT_TYPE, |
| "expected=%s", rctx->expected_ct); |
| return 0; |
| } |
| if (rctx->state == OHS_REDIRECT) { |
| /* http status code indicated redirect but there was no Location */ |
| ERR_raise(ERR_LIB_HTTP, HTTP_R_MISSING_REDIRECT_LOCATION); |
| return 0; |
| } |
| |
| if (!rctx->expect_asn1) { |
| rctx->state = OHS_STREAM; |
| return 1; |
| } |
| |
| rctx->state = OHS_ASN1_HEADER; |
| |
| /* Fall thru */ |
| case OHS_ASN1_HEADER: |
| /* |
| * Now reading ASN1 header: can read at least 2 bytes which is enough |
| * for ASN1 SEQUENCE header and either length field or at least the |
| * length of the length field. |
| */ |
| n = BIO_get_mem_data(rctx->mem, &p); |
| if (n < 2) |
| goto next_io; |
| |
| /* Check it is an ASN1 SEQUENCE */ |
| if (*p++ != (V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED)) { |
| ERR_raise(ERR_LIB_HTTP, HTTP_R_MISSING_ASN1_ENCODING); |
| return 0; |
| } |
| |
| /* Check out length field */ |
| if ((*p & 0x80) != 0) { |
| /* |
| * If MSB set on initial length octet we can now always read 6 |
| * octets: make sure we have them. |
| */ |
| if (n < 6) |
| goto next_io; |
| n = *p & 0x7F; |
| /* Not NDEF or excessive length */ |
| if (n == 0 || (n > 4)) { |
| ERR_raise(ERR_LIB_HTTP, HTTP_R_ERROR_PARSING_ASN1_LENGTH); |
| return 0; |
| } |
| p++; |
| resp_len = 0; |
| for (i = 0; i < n; i++) { |
| resp_len <<= 8; |
| resp_len |= *p++; |
| } |
| resp_len += n + 2; |
| } else { |
| resp_len = *p + 2; |
| } |
| if (!check_set_resp_len(rctx, resp_len)) |
| return 0; |
| |
| rctx->state = OHS_ASN1_CONTENT; |
| |
| /* Fall thru */ |
| case OHS_ASN1_CONTENT: |
| default: |
| n = BIO_get_mem_data(rctx->mem, NULL); |
| if (n < 0 || (size_t)n < rctx->resp_len) |
| goto next_io; |
| |
| rctx->state = OHS_ASN1_DONE; |
| return 1; |
| } |
| } |
| |
| int OSSL_HTTP_REQ_CTX_nbio_d2i(OSSL_HTTP_REQ_CTX *rctx, |
| ASN1_VALUE **pval, const ASN1_ITEM *it) |
| { |
| const unsigned char *p; |
| int rv; |
| |
| *pval = NULL; |
| if ((rv = OSSL_HTTP_REQ_CTX_nbio(rctx)) != 1) |
| return rv; |
| *pval = ASN1_item_d2i(NULL, &p, BIO_get_mem_data(rctx->mem, &p), it); |
| return *pval != NULL; |
| |
| } |
| |
| #ifndef OPENSSL_NO_SOCK |
| |
| /* set up a new connection BIO, to HTTP server or to HTTP(S) proxy if given */ |
| static BIO *http_new_bio(const char *server /* optionally includes ":port" */, |
| const char *server_port /* explicit server port */, |
| int use_ssl, |
| const char *proxy /* optionally includes ":port" */, |
| const char *proxy_port /* explicit proxy port */) |
| { |
| const char *host = server; |
| const char *port = server_port; |
| BIO *cbio; |
| |
| if (!ossl_assert(server != NULL)) |
| return NULL; |
| |
| if (proxy != NULL) { |
| host = proxy; |
| port = proxy_port; |
| } |
| |
| if (port == NULL && strchr(host, ':') == NULL) |
| port = use_ssl ? OSSL_HTTPS_PORT : OSSL_HTTP_PORT; |
| |
| cbio = BIO_new_connect(host /* optionally includes ":port" */); |
| if (cbio == NULL) |
| goto end; |
| if (port != NULL) |
| (void)BIO_set_conn_port(cbio, port); |
| |
| end: |
| return cbio; |
| } |
| #endif /* OPENSSL_NO_SOCK */ |
| |
| /* Exchange request and response via HTTP on (non-)blocking BIO */ |
| BIO *OSSL_HTTP_REQ_CTX_exchange(OSSL_HTTP_REQ_CTX *rctx) |
| { |
| int rv; |
| |
| if (rctx == NULL) { |
| ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); |
| return NULL; |
| } |
| |
| for (;;) { |
| rv = OSSL_HTTP_REQ_CTX_nbio(rctx); |
| if (rv != -1) |
| break; |
| /* BIO_should_retry was true */ |
| /* will not actually wait if rctx->max_time == 0 */ |
| if (BIO_wait(rctx->rbio, rctx->max_time, 100 /* milliseconds */) <= 0) |
| return NULL; |
| } |
| |
| if (rv == 0) { |
| if (rctx->redirection_url == NULL) { /* an error occurred */ |
| if (rctx->len_to_send > 0) |
| ERR_raise(ERR_LIB_HTTP, HTTP_R_ERROR_SENDING); |
| else |
| ERR_raise(ERR_LIB_HTTP, HTTP_R_ERROR_RECEIVING); |
| } |
| return NULL; |
| } |
| return rctx->state == OHS_STREAM ? rctx->rbio : rctx->mem; |
| } |
| |
| int OSSL_HTTP_is_alive(const OSSL_HTTP_REQ_CTX *rctx) |
| { |
| return rctx != NULL && rctx->keep_alive != 0; |
| } |
| |
| /* High-level HTTP API implementation */ |
| |
| /* Initiate an HTTP session using bio, else use given server, proxy, etc. */ |
| OSSL_HTTP_REQ_CTX *OSSL_HTTP_open(const char *server, const char *port, |
| const char *proxy, const char *no_proxy, |
| int use_ssl, BIO *bio, BIO *rbio, |
| OSSL_HTTP_bio_cb_t bio_update_fn, void *arg, |
| int buf_size, int overall_timeout) |
| { |
| BIO *cbio; /* == bio if supplied, used as connection BIO if rbio is NULL */ |
| OSSL_HTTP_REQ_CTX *rctx = NULL; |
| |
| if (use_ssl && bio_update_fn == NULL) { |
| ERR_raise(ERR_LIB_HTTP, HTTP_R_TLS_NOT_ENABLED); |
| return NULL; |
| } |
| if (rbio != NULL && (bio == NULL || bio_update_fn != NULL)) { |
| ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_INVALID_ARGUMENT); |
| return NULL; |
| } |
| |
| if (bio != NULL) { |
| cbio = bio; |
| if (proxy != NULL || no_proxy != NULL) { |
| ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_INVALID_ARGUMENT); |
| return NULL; |
| } |
| } else { |
| #ifndef OPENSSL_NO_SOCK |
| char *proxy_host = NULL, *proxy_port = NULL; |
| |
| if (server == NULL) { |
| ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); |
| return NULL; |
| } |
| if (port != NULL && *port == '\0') |
| port = NULL; |
| if (port == NULL && strchr(server, ':') == NULL) |
| port = use_ssl ? OSSL_HTTPS_PORT : OSSL_HTTP_PORT; |
| proxy = OSSL_HTTP_adapt_proxy(proxy, no_proxy, server, use_ssl); |
| if (proxy != NULL |
| && !OSSL_HTTP_parse_url(proxy, NULL /* use_ssl */, NULL /* user */, |
| &proxy_host, &proxy_port, NULL /* num */, |
| NULL /* path */, NULL, NULL)) |
| return NULL; |
| cbio = http_new_bio(server, port, use_ssl, proxy_host, proxy_port); |
| OPENSSL_free(proxy_host); |
| OPENSSL_free(proxy_port); |
| if (cbio == NULL) |
| return NULL; |
| #else |
| ERR_raise(ERR_LIB_HTTP, HTTP_R_SOCK_NOT_SUPPORTED); |
| return NULL; |
| #endif |
| } |
| |
| (void)ERR_set_mark(); /* prepare removing any spurious libssl errors */ |
| if (rbio == NULL && BIO_do_connect_retry(cbio, overall_timeout, -1) <= 0) { |
| if (bio == NULL) /* cbio was not provided by caller */ |
| BIO_free_all(cbio); |
| goto end; |
| } |
| /* now overall_timeout is guaranteed to be >= 0 */ |
| |
| /* adapt in order to fix callback design flaw, see #17088 */ |
| /* callback can be used to wrap or prepend TLS session */ |
| if (bio_update_fn != NULL) { |
| BIO *orig_bio = cbio; |
| |
| cbio = (*bio_update_fn)(cbio, arg, 1 /* connect */, use_ssl); |
| if (cbio == NULL) { |
| if (bio == NULL) /* cbio was not provided by caller */ |
| BIO_free_all(orig_bio); |
| goto end; |
| } |
| } |
| |
| rctx = http_req_ctx_new(bio == NULL, cbio, rbio != NULL ? rbio : cbio, |
| bio_update_fn, arg, use_ssl, proxy, server, port, |
| buf_size, overall_timeout); |
| |
| end: |
| if (rctx != NULL) |
| /* remove any spurious error queue entries by ssl_add_cert_chain() */ |
| (void)ERR_pop_to_mark(); |
| else |
| (void)ERR_clear_last_mark(); |
| |
| return rctx; |
| } |
| |
| int OSSL_HTTP_set1_request(OSSL_HTTP_REQ_CTX *rctx, const char *path, |
| const STACK_OF(CONF_VALUE) *headers, |
| const char *content_type, BIO *req, |
| const char *expected_content_type, int expect_asn1, |
| size_t max_resp_len, int timeout, int keep_alive) |
| { |
| int use_http_proxy; |
| |
| if (rctx == NULL) { |
| ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); |
| return 0; |
| } |
| use_http_proxy = rctx->proxy != NULL && !rctx->use_ssl; |
| if (use_http_proxy && rctx->server == NULL) { |
| ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_INVALID_ARGUMENT); |
| return 0; |
| } |
| rctx->max_resp_len = max_resp_len; /* allows for 0: indefinite */ |
| |
| return OSSL_HTTP_REQ_CTX_set_request_line(rctx, req != NULL, |
| use_http_proxy ? rctx->server |
| : NULL, rctx->port, path) |
| && add1_headers(rctx, headers, rctx->server) |
| && OSSL_HTTP_REQ_CTX_set_expected(rctx, expected_content_type, |
| expect_asn1, timeout, keep_alive) |
| && set1_content(rctx, content_type, req); |
| } |
| |
| /*- |
| * Exchange single HTTP request and response according to rctx. |
| * If rctx->method_POST then use POST, else use GET and ignore content_type. |
| * The redirection_url output (freed by caller) parameter is used only for GET. |
| */ |
| BIO *OSSL_HTTP_exchange(OSSL_HTTP_REQ_CTX *rctx, char **redirection_url) |
| { |
| BIO *resp; |
| |
| if (rctx == NULL) { |
| ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); |
| return NULL; |
| } |
| |
| if (redirection_url != NULL) |
| *redirection_url = NULL; /* do this beforehand to prevent dbl free */ |
| |
| resp = OSSL_HTTP_REQ_CTX_exchange(rctx); |
| if (resp == NULL) { |
| if (rctx->redirection_url != NULL) { |
| if (redirection_url == NULL) |
| ERR_raise(ERR_LIB_HTTP, HTTP_R_REDIRECTION_NOT_ENABLED); |
| else |
| /* may be NULL if out of memory: */ |
| *redirection_url = OPENSSL_strdup(rctx->redirection_url); |
| } else { |
| char buf[200]; |
| unsigned long err = ERR_peek_error(); |
| int lib = ERR_GET_LIB(err); |
| int reason = ERR_GET_REASON(err); |
| |
| if (lib == ERR_LIB_SSL || lib == ERR_LIB_HTTP |
| || (lib == ERR_LIB_BIO && reason == BIO_R_CONNECT_TIMEOUT) |
| || (lib == ERR_LIB_BIO && reason == BIO_R_CONNECT_ERROR) |
| #ifndef OPENSSL_NO_CMP |
| || (lib == ERR_LIB_CMP |
| && reason == CMP_R_POTENTIALLY_INVALID_CERTIFICATE) |
| #endif |
| ) { |
| if (rctx->server != NULL) { |
| BIO_snprintf(buf, sizeof(buf), "server=http%s://%s%s%s", |
| rctx->use_ssl ? "s" : "", rctx->server, |
| rctx->port != NULL ? ":" : "", |
| rctx->port != NULL ? rctx->port : ""); |
| ERR_add_error_data(1, buf); |
| } |
| if (rctx->proxy != NULL) |
| ERR_add_error_data(2, " proxy=", rctx->proxy); |
| if (err == 0) { |
| BIO_snprintf(buf, sizeof(buf), " peer has disconnected%s", |
| rctx->use_ssl ? " violating the protocol" : |
| ", likely because it requires the use of TLS"); |
| ERR_add_error_data(1, buf); |
| } |
| } |
| } |
| } |
| |
| if (resp != NULL && !BIO_up_ref(resp)) |
| resp = NULL; |
| return resp; |
| } |
| |
| static int redirection_ok(int n_redir, const char *old_url, const char *new_url) |
| { |
| if (n_redir >= HTTP_VERSION_MAX_REDIRECTIONS) { |
| ERR_raise(ERR_LIB_HTTP, HTTP_R_TOO_MANY_REDIRECTIONS); |
| return 0; |
| } |
| if (*new_url == '/') /* redirection to same server => same protocol */ |
| return 1; |
| if (HAS_PREFIX(old_url, OSSL_HTTPS_NAME":") && |
| !HAS_PREFIX(new_url, OSSL_HTTPS_NAME":")) { |
| ERR_raise(ERR_LIB_HTTP, HTTP_R_REDIRECTION_FROM_HTTPS_TO_HTTP); |
| return 0; |
| } |
| return 1; |
| } |
| |
| /* Get data via HTTP from server at given URL, potentially with redirection */ |
| BIO *OSSL_HTTP_get(const char *url, const char *proxy, const char *no_proxy, |
| BIO *bio, BIO *rbio, |
| OSSL_HTTP_bio_cb_t bio_update_fn, void *arg, |
| int buf_size, const STACK_OF(CONF_VALUE) *headers, |
| const char *expected_ct, int expect_asn1, |
| size_t max_resp_len, int timeout) |
| { |
| char *current_url, *redirection_url = NULL; |
| int n_redirs = 0; |
| char *host; |
| char *port; |
| char *path; |
| int use_ssl; |
| OSSL_HTTP_REQ_CTX *rctx; |
| BIO *resp = NULL; |
| time_t max_time = timeout > 0 ? time(NULL) + timeout : 0; |
| |
| if (url == NULL) { |
| ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); |
| return NULL; |
| } |
| if ((current_url = OPENSSL_strdup(url)) == NULL) |
| return NULL; |
| |
| for (;;) { |
| if (!OSSL_HTTP_parse_url(current_url, &use_ssl, NULL /* user */, &host, |
| &port, NULL /* port_num */, &path, NULL, NULL)) |
| break; |
| |
| rctx = OSSL_HTTP_open(host, port, proxy, no_proxy, |
| use_ssl, bio, rbio, bio_update_fn, arg, |
| buf_size, timeout); |
| new_rpath: |
| if (rctx != NULL) { |
| if (!OSSL_HTTP_set1_request(rctx, path, headers, |
| NULL /* content_type */, |
| NULL /* req */, |
| expected_ct, expect_asn1, max_resp_len, |
| -1 /* use same max time (timeout) */, |
| 0 /* no keep_alive */)) |
| OSSL_HTTP_REQ_CTX_free(rctx); |
| else |
| resp = OSSL_HTTP_exchange(rctx, &redirection_url); |
| } |
| OPENSSL_free(path); |
| if (resp == NULL && redirection_url != NULL) { |
| if (redirection_ok(++n_redirs, current_url, redirection_url) |
| && may_still_retry(max_time, &timeout)) { |
| (void)BIO_reset(bio); |
| OPENSSL_free(current_url); |
| current_url = redirection_url; |
| if (*redirection_url == '/') { /* redirection to same server */ |
| path = OPENSSL_strdup(redirection_url); |
| goto new_rpath; |
| } |
| OPENSSL_free(host); |
| OPENSSL_free(port); |
| (void)OSSL_HTTP_close(rctx, 1); |
| continue; |
| } |
| /* if redirection not allowed, ignore it */ |
| OPENSSL_free(redirection_url); |
| } |
| OPENSSL_free(host); |
| OPENSSL_free(port); |
| if (!OSSL_HTTP_close(rctx, resp != NULL)) { |
| BIO_free(resp); |
| resp = NULL; |
| } |
| break; |
| } |
| OPENSSL_free(current_url); |
| return resp; |
| } |
| |
| /* Exchange request and response over a connection managed via |prctx| */ |
| BIO *OSSL_HTTP_transfer(OSSL_HTTP_REQ_CTX **prctx, |
| const char *server, const char *port, |
| const char *path, int use_ssl, |
| const char *proxy, const char *no_proxy, |
| BIO *bio, BIO *rbio, |
| OSSL_HTTP_bio_cb_t bio_update_fn, void *arg, |
| int buf_size, const STACK_OF(CONF_VALUE) *headers, |
| const char *content_type, BIO *req, |
| const char *expected_ct, int expect_asn1, |
| size_t max_resp_len, int timeout, int keep_alive) |
| { |
| OSSL_HTTP_REQ_CTX *rctx = prctx == NULL ? NULL : *prctx; |
| BIO *resp = NULL; |
| |
| if (rctx == NULL) { |
| rctx = OSSL_HTTP_open(server, port, proxy, no_proxy, |
| use_ssl, bio, rbio, bio_update_fn, arg, |
| buf_size, timeout); |
| timeout = -1; /* Already set during opening the connection */ |
| } |
| if (rctx != NULL) { |
| if (OSSL_HTTP_set1_request(rctx, path, headers, content_type, req, |
| expected_ct, expect_asn1, |
| max_resp_len, timeout, keep_alive)) |
| resp = OSSL_HTTP_exchange(rctx, NULL); |
| if (resp == NULL || !OSSL_HTTP_is_alive(rctx)) { |
| if (!OSSL_HTTP_close(rctx, resp != NULL)) { |
| BIO_free(resp); |
| resp = NULL; |
| } |
| rctx = NULL; |
| } |
| } |
| if (prctx != NULL) |
| *prctx = rctx; |
| return resp; |
| } |
| |
| int OSSL_HTTP_close(OSSL_HTTP_REQ_CTX *rctx, int ok) |
| { |
| BIO *wbio; |
| int ret = 1; |
| |
| /* callback can be used to finish TLS session and free its BIO */ |
| if (rctx != NULL && rctx->upd_fn != NULL) { |
| wbio = (*rctx->upd_fn)(rctx->wbio, rctx->upd_arg, |
| 0 /* disconnect */, ok); |
| ret = wbio != NULL; |
| if (ret) |
| rctx->wbio = wbio; |
| } |
| OSSL_HTTP_REQ_CTX_free(rctx); |
| return ret; |
| } |
| |
| /* BASE64 encoder used for encoding basic proxy authentication credentials */ |
| static char *base64encode(const void *buf, size_t len) |
| { |
| int i; |
| size_t outl; |
| char *out; |
| |
| /* Calculate size of encoded data */ |
| outl = (len / 3); |
| if (len % 3 > 0) |
| outl++; |
| outl <<= 2; |
| out = OPENSSL_malloc(outl + 1); |
| if (out == NULL) |
| return 0; |
| |
| i = EVP_EncodeBlock((unsigned char *)out, buf, len); |
| if (!ossl_assert(0 <= i && (size_t)i <= outl)) { |
| OPENSSL_free(out); |
| return NULL; |
| } |
| return out; |
| } |
| |
| /* |
| * Promote the given connection BIO using the CONNECT method for a TLS proxy. |
| * This is typically called by an app, so bio_err and prog are used unless NULL |
| * to print additional diagnostic information in a user-oriented way. |
| */ |
| int OSSL_HTTP_proxy_connect(BIO *bio, const char *server, const char *port, |
| const char *proxyuser, const char *proxypass, |
| int timeout, BIO *bio_err, const char *prog) |
| { |
| #undef BUF_SIZE |
| #define BUF_SIZE (8 * 1024) |
| char *mbuf = OPENSSL_malloc(BUF_SIZE); |
| char *mbufp; |
| int read_len = 0; |
| int ret = 0; |
| BIO *fbio = BIO_new(BIO_f_buffer()); |
| int rv; |
| time_t max_time = timeout > 0 ? time(NULL) + timeout : 0; |
| |
| if (bio == NULL || server == NULL |
| || (bio_err != NULL && prog == NULL)) { |
| ERR_raise(ERR_LIB_HTTP, ERR_R_PASSED_NULL_PARAMETER); |
| goto end; |
| } |
| if (port == NULL || *port == '\0') |
| port = OSSL_HTTPS_PORT; |
| |
| if (mbuf == NULL || fbio == NULL) { |
| BIO_printf(bio_err /* may be NULL */, "%s: out of memory", prog); |
| goto end; |
| } |
| BIO_push(fbio, bio); |
| |
| BIO_printf(fbio, "CONNECT %s:%s "HTTP_1_0"\r\n", server, port); |
| |
| /* |
| * Workaround for broken proxies which would otherwise close |
| * the connection when entering tunnel mode (e.g., Squid 2.6) |
| */ |
| BIO_printf(fbio, "Proxy-Connection: Keep-Alive\r\n"); |
| |
| /* Support for basic (base64) proxy authentication */ |
| if (proxyuser != NULL) { |
| size_t len = strlen(proxyuser) + 1; |
| char *proxyauth, *proxyauthenc = NULL; |
| |
| if (proxypass != NULL) |
| len += strlen(proxypass); |
| proxyauth = OPENSSL_malloc(len + 1); |
| if (proxyauth == NULL) |
| goto end; |
| if (BIO_snprintf(proxyauth, len + 1, "%s:%s", proxyuser, |
| proxypass != NULL ? proxypass : "") != (int)len) |
| goto proxy_end; |
| proxyauthenc = base64encode(proxyauth, len); |
| if (proxyauthenc != NULL) { |
| BIO_printf(fbio, "Proxy-Authorization: Basic %s\r\n", proxyauthenc); |
| OPENSSL_clear_free(proxyauthenc, strlen(proxyauthenc)); |
| } |
| proxy_end: |
| OPENSSL_clear_free(proxyauth, len); |
| if (proxyauthenc == NULL) |
| goto end; |
| } |
| |
| /* Terminate the HTTP CONNECT request */ |
| BIO_printf(fbio, "\r\n"); |
| |
| for (;;) { |
| if (BIO_flush(fbio) != 0) |
| break; |
| /* potentially needs to be retried if BIO is non-blocking */ |
| if (!BIO_should_retry(fbio)) |
| break; |
| } |
| |
| for (;;) { |
| /* will not actually wait if timeout == 0 */ |
| rv = BIO_wait(fbio, max_time, 100 /* milliseconds */); |
| if (rv <= 0) { |
| BIO_printf(bio_err, "%s: HTTP CONNECT %s\n", prog, |
| rv == 0 ? "timed out" : "failed waiting for data"); |
| goto end; |
| } |
| |
| /*- |
| * The first line is the HTTP response. |
| * According to RFC 7230, it is formatted exactly like this: |
| * HTTP/d.d ddd reason text\r\n |
| */ |
| read_len = BIO_gets(fbio, mbuf, BUF_SIZE); |
| /* the BIO may not block, so we must wait for the 1st line to come in */ |
| if (read_len < (int)HTTP_LINE1_MINLEN) |
| continue; |
| |
| /* Check for HTTP/1.x */ |
| mbufp = mbuf; |
| if (!CHECK_AND_SKIP_PREFIX(mbufp, HTTP_PREFIX)) { |
| ERR_raise(ERR_LIB_HTTP, HTTP_R_HEADER_PARSE_ERROR); |
| BIO_printf(bio_err, "%s: HTTP CONNECT failed, non-HTTP response\n", |
| prog); |
| /* Wrong protocol, not even HTTP, so stop reading headers */ |
| goto end; |
| } |
| if (!HAS_PREFIX(mbufp, HTTP_VERSION_PATT)) { |
| ERR_raise(ERR_LIB_HTTP, HTTP_R_RECEIVED_WRONG_HTTP_VERSION); |
| BIO_printf(bio_err, |
| "%s: HTTP CONNECT failed, bad HTTP version %.*s\n", |
| prog, (int)HTTP_VERSION_STR_LEN, mbufp); |
| goto end; |
| } |
| mbufp += HTTP_VERSION_STR_LEN; |
| |
| /* RFC 7231 4.3.6: any 2xx status code is valid */ |
| if (!HAS_PREFIX(mbufp, " 2")) { |
| if (ossl_isspace(*mbufp)) |
| mbufp++; |
| /* chop any trailing whitespace */ |
| while (read_len > 0 && ossl_isspace(mbuf[read_len - 1])) |
| read_len--; |
| mbuf[read_len] = '\0'; |
| ERR_raise_data(ERR_LIB_HTTP, HTTP_R_CONNECT_FAILURE, |
| "reason=%s", mbufp); |
| BIO_printf(bio_err, "%s: HTTP CONNECT failed, reason=%s\n", |
| prog, mbufp); |
| goto end; |
| } |
| ret = 1; |
| break; |
| } |
| |
| /* Read past all following headers */ |
| do { |
| /* |
| * This does not necessarily catch the case when the full |
| * HTTP response came in in more than a single TCP message. |
| */ |
| read_len = BIO_gets(fbio, mbuf, BUF_SIZE); |
| } while (read_len > 2); |
| |
| end: |
| if (fbio != NULL) { |
| (void)BIO_flush(fbio); |
| BIO_pop(fbio); |
| BIO_free(fbio); |
| } |
| OPENSSL_free(mbuf); |
| return ret; |
| #undef BUF_SIZE |
| } |
