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