diff options
Diffstat (limited to 'crypto/http/http_client.c')
| -rw-r--r-- | crypto/http/http_client.c | 1422 |
1 files changed, 1422 insertions, 0 deletions
diff --git a/crypto/http/http_client.c b/crypto/http/http_client.c new file mode 100644 index 000000000000..0d62f1c7bf16 --- /dev/null +++ b/crypto/http/http_client.c @@ -0,0 +1,1422 @@ +/* + * Copyright 2001-2022 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 "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/cryptlib.h" /* for ossl_assert() */ + +#define HAS_PREFIX(str, prefix) (strncmp(str, prefix, sizeof(prefix) - 1) == 0) +#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; /* Mem BIO holding request header or response */ + 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 = 0; +#ifndef OPENSSL_NO_STDIO + FILE *fp = NULL; +#endif + + 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; + + /* + * BIO_CTRL_INFO yields the data length at least for memory BIOs, but for + * file-based BIOs it gives the current position, which is not what we need. + */ + if (BIO_method_type(req) == BIO_TYPE_FILE) { +#ifndef OPENSSL_NO_STDIO + if (BIO_get_fp(req, &fp) == 1 && fseek(fp, 0, SEEK_END) == 0) { + req_len = ftell(fp); + (void)fseek(fp, 0, SEEK_SET); + } else { + fp = NULL; + } +#endif + } else { + req_len = BIO_ctrl(req, BIO_CTRL_INFO, 0, NULL); + /* + * Streaming BIOs likely will not support querying the size at all, + * and we assume we got a correct value if req_len > 0. + */ + } + if (( +#ifndef OPENSSL_NO_STDIO + fp != NULL /* definitely correct req_len */ || +#endif + req_len > 0) + && BIO_printf(rctx->mem, "Content-Length: %ld\r\n", req_len) < 0) + return 0; + + if (!BIO_up_ref(req)) + return 0; + rctx->req = req; + return 1; +} + +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 (!HAS_PREFIX(line, HTTP_PREFIX_VERSION)) + goto err; + /* above HTTP 1.0, connection persistence is the default */ + *found_keep_alive = line[strlen(HTTP_PREFIX_VERSION)] > '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) { /* unsupported method */ + (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->req)) + 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 != 0); + 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); + if (path == NULL) { + OPENSSL_free(host); + OPENSSL_free(port); + (void)OSSL_HTTP_close(rctx, 1); + BIO_free(resp); + OPENSSL_free(current_url); + return NULL; + } + 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 */ + if (!HAS_PREFIX(mbuf, HTTP_PREFIX) != 0) { + 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; + } + mbufp = mbuf + strlen(HTTP_PREFIX); + if (!HAS_PREFIX(mbufp, HTTP_VERSION_PATT) != 0) { + 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")) { + /* 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 +} |