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ffmpeg/libavformat/httpauth.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

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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 "libavutil/mem.h"
#include "internal.h"
#include "libavutil/random_seed.h"
#include "libavutil/md5.h"
#include "urldecode.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 (!av_strcasecmp(key, "WWW-Authenticate") || !av_strcasecmp(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 (!av_strcasecmp(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);
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);
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);
} 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);
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);
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, 0);
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, 0), *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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