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ffmpeg/libavformat/httpauth.c
Andrey Utkin fdb3283872 avformat/httpauth: Add space after commas in HTTP/RTSP auth header 
This fixes access to Grandstream cameras, which return 401 to ffmpeg
otherwise.
VLC sends Authorization: header with spaces between parameters, and it
is known to work with Grandstream devices and broad range of other HTTP
and RTSP servers, so author considers switching to such behaviour safe.
Just for record - RFC 2617 (HTTP Auth) does not specify the need in
spaces, so this is not a bug of FFmpeg.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2015-10-07 00:10:16 +02:00

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/*
* HTTP authentication
* Copyright (c) 2010 Martin Storsjo
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "httpauth.h"
#include "libavutil/base64.h"
#include "libavutil/avstring.h"
#include "internal.h"
#include "libavutil/random_seed.h"
#include "libavutil/md5.h"
#include "urldecode.h"
#include "avformat.h"
static void handle_basic_params(HTTPAuthState *state, const char *key,
int key_len, char **dest, int *dest_len)
{
if (!strncmp(key, "realm=", key_len)) {
*dest = state->realm;
*dest_len = sizeof(state->realm);
}
}
static void handle_digest_params(HTTPAuthState *state, const char *key,
int key_len, char **dest, int *dest_len)
{
DigestParams *digest = &state->digest_params;
if (!strncmp(key, "realm=", key_len)) {
*dest = state->realm;
*dest_len = sizeof(state->realm);
} else if (!strncmp(key, "nonce=", key_len)) {
*dest = digest->nonce;
*dest_len = sizeof(digest->nonce);
} else if (!strncmp(key, "opaque=", key_len)) {
*dest = digest->opaque;
*dest_len = sizeof(digest->opaque);
} else if (!strncmp(key, "algorithm=", key_len)) {
*dest = digest->algorithm;
*dest_len = sizeof(digest->algorithm);
} else if (!strncmp(key, "qop=", key_len)) {
*dest = digest->qop;
*dest_len = sizeof(digest->qop);
} else if (!strncmp(key, "stale=", key_len)) {
*dest = digest->stale;
*dest_len = sizeof(digest->stale);
}
}
static void handle_digest_update(HTTPAuthState *state, const char *key,
int key_len, char **dest, int *dest_len)
{
DigestParams *digest = &state->digest_params;
if (!strncmp(key, "nextnonce=", key_len)) {
*dest = digest->nonce;
*dest_len = sizeof(digest->nonce);
}
}
static void choose_qop(char *qop, int size)
{
char *ptr = strstr(qop, "auth");
char *end = ptr + strlen("auth");
if (ptr && (!*end || av_isspace(*end) || *end == ',') &&
(ptr == qop || av_isspace(ptr[-1]) || ptr[-1] == ',')) {
av_strlcpy(qop, "auth", size);
} else {
qop[0] = 0;
}
}
void ff_http_auth_handle_header(HTTPAuthState *state, const char *key,
const char *value)
{
if (!strcmp(key, "WWW-Authenticate") || !strcmp(key, "Proxy-Authenticate")) {
const char *p;
if (av_stristart(value, "Basic ", &p) &&
state->auth_type <= HTTP_AUTH_BASIC) {
state->auth_type = HTTP_AUTH_BASIC;
state->realm[0] = 0;
state->stale = 0;
ff_parse_key_value(p, (ff_parse_key_val_cb) handle_basic_params,
state);
} else if (av_stristart(value, "Digest ", &p) &&
state->auth_type <= HTTP_AUTH_DIGEST) {
state->auth_type = HTTP_AUTH_DIGEST;
memset(&state->digest_params, 0, sizeof(DigestParams));
state->realm[0] = 0;
state->stale = 0;
ff_parse_key_value(p, (ff_parse_key_val_cb) handle_digest_params,
state);
choose_qop(state->digest_params.qop,
sizeof(state->digest_params.qop));
if (!av_strcasecmp(state->digest_params.stale, "true"))
state->stale = 1;
}
} else if (!strcmp(key, "Authentication-Info")) {
ff_parse_key_value(value, (ff_parse_key_val_cb) handle_digest_update,
state);
}
}
static void update_md5_strings(struct AVMD5 *md5ctx, ...)
{
va_list vl;
va_start(vl, md5ctx);
while (1) {
const char* str = va_arg(vl, const char*);
if (!str)
break;
av_md5_update(md5ctx, str, strlen(str));
}
va_end(vl);
}
/* Generate a digest reply, according to RFC 2617. */
static char *make_digest_auth(HTTPAuthState *state, const char *username,
const char *password, const char *uri,
const char *method)
{
DigestParams *digest = &state->digest_params;
int len;
uint32_t cnonce_buf[2];
char cnonce[17];
char nc[9];
int i;
char A1hash[33], A2hash[33], response[33];
struct AVMD5 *md5ctx;
uint8_t hash[16];
char *authstr;
digest->nc++;
snprintf(nc, sizeof(nc), "%08x", digest->nc);
/* Generate a client nonce. */
for (i = 0; i < 2; i++)
cnonce_buf[i] = av_get_random_seed();
ff_data_to_hex(cnonce, (const uint8_t*) cnonce_buf, sizeof(cnonce_buf), 1);
cnonce[2*sizeof(cnonce_buf)] = 0;
md5ctx = av_md5_alloc();
if (!md5ctx)
return NULL;
av_md5_init(md5ctx);
update_md5_strings(md5ctx, username, ":", state->realm, ":", password, NULL);
av_md5_final(md5ctx, hash);
ff_data_to_hex(A1hash, hash, 16, 1);
A1hash[32] = 0;
if (!strcmp(digest->algorithm, "") || !strcmp(digest->algorithm, "MD5")) {
} else if (!strcmp(digest->algorithm, "MD5-sess")) {
av_md5_init(md5ctx);
update_md5_strings(md5ctx, A1hash, ":", digest->nonce, ":", cnonce, NULL);
av_md5_final(md5ctx, hash);
ff_data_to_hex(A1hash, hash, 16, 1);
A1hash[32] = 0;
} else {
/* Unsupported algorithm */
av_free(md5ctx);
return NULL;
}
av_md5_init(md5ctx);
update_md5_strings(md5ctx, method, ":", uri, NULL);
av_md5_final(md5ctx, hash);
ff_data_to_hex(A2hash, hash, 16, 1);
A2hash[32] = 0;
av_md5_init(md5ctx);
update_md5_strings(md5ctx, A1hash, ":", digest->nonce, NULL);
if (!strcmp(digest->qop, "auth") || !strcmp(digest->qop, "auth-int")) {
update_md5_strings(md5ctx, ":", nc, ":", cnonce, ":", digest->qop, NULL);
}
update_md5_strings(md5ctx, ":", A2hash, NULL);
av_md5_final(md5ctx, hash);
ff_data_to_hex(response, hash, 16, 1);
response[32] = 0;
av_free(md5ctx);
if (!strcmp(digest->qop, "") || !strcmp(digest->qop, "auth")) {
} else if (!strcmp(digest->qop, "auth-int")) {
/* qop=auth-int not supported */
return NULL;
} else {
/* Unsupported qop value. */
return NULL;
}
len = strlen(username) + strlen(state->realm) + strlen(digest->nonce) +
strlen(uri) + strlen(response) + strlen(digest->algorithm) +
strlen(digest->opaque) + strlen(digest->qop) + strlen(cnonce) +
strlen(nc) + 150;
authstr = av_malloc(len);
if (!authstr)
return NULL;
snprintf(authstr, len, "Authorization: Digest ");
/* TODO: Escape the quoted strings properly. */
av_strlcatf(authstr, len, "username=\"%s\"", username);
av_strlcatf(authstr, len, ", realm=\"%s\"", state->realm);
av_strlcatf(authstr, len, ", nonce=\"%s\"", digest->nonce);
av_strlcatf(authstr, len, ", uri=\"%s\"", uri);
av_strlcatf(authstr, len, ", response=\"%s\"", response);
// we are violating the RFC and use "" because all others seem to do that too.
if (digest->algorithm[0])
av_strlcatf(authstr, len, ", algorithm=\"%s\"", digest->algorithm);
if (digest->opaque[0])
av_strlcatf(authstr, len, ", opaque=\"%s\"", digest->opaque);
if (digest->qop[0]) {
av_strlcatf(authstr, len, ", qop=\"%s\"", digest->qop);
av_strlcatf(authstr, len, ", cnonce=\"%s\"", cnonce);
av_strlcatf(authstr, len, ", nc=%s", nc);
}
av_strlcatf(authstr, len, "\r\n");
return authstr;
}
char *ff_http_auth_create_response(HTTPAuthState *state, const char *auth,
const char *path, const char *method)
{
char *authstr = NULL;
/* Clear the stale flag, we assume the auth is ok now. It is reset
* by the server headers if there's a new issue. */
state->stale = 0;
if (!auth || !strchr(auth, ':'))
return NULL;
if (state->auth_type == HTTP_AUTH_BASIC) {
int auth_b64_len, len;
char *ptr, *decoded_auth = ff_urldecode(auth);
if (!decoded_auth)
return NULL;
auth_b64_len = AV_BASE64_SIZE(strlen(decoded_auth));
len = auth_b64_len + 30;
authstr = av_malloc(len);
if (!authstr) {
av_free(decoded_auth);
return NULL;
}
snprintf(authstr, len, "Authorization: Basic ");
ptr = authstr + strlen(authstr);
av_base64_encode(ptr, auth_b64_len, decoded_auth, strlen(decoded_auth));
av_strlcat(ptr, "\r\n", len - (ptr - authstr));
av_free(decoded_auth);
} else if (state->auth_type == HTTP_AUTH_DIGEST) {
char *username = ff_urldecode(auth), *password;
if (!username)
return NULL;
if ((password = strchr(username, ':'))) {
*password++ = 0;
authstr = make_digest_auth(state, username, password, path, method);
}
av_free(username);
}
return authstr;
}
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