3 * Copyright (c) 2010 Martin Storsjo
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "libavutil/base64.h"
24 #include "libavutil/avstring.h"
26 #include "libavutil/random_seed.h"
27 #include "libavutil/md5.h"
31 static void parse_key_value(const char *params,
32 void (*callback_get_buf)(HTTPAuthState *state,
33 const char *key, int key_len,
34 char **dest, int *dest_len), HTTPAuthState *state)
36 const char *ptr = params;
38 /* Parse key=value pairs. */
41 char *dest = NULL, *dest_end;
42 int key_len, dest_len = 0;
44 /* Skip whitespace and potential commas. */
45 while (*ptr && (isspace(*ptr) || *ptr == ','))
52 if (!(ptr = strchr(key, '=')))
57 callback_get_buf(state, key, key_len, &dest, &dest_len);
58 dest_end = dest + dest_len - 1;
62 while (*ptr && *ptr != '\"') {
66 if (dest && dest < dest_end)
70 if (dest && dest < dest_end)
78 for (; *ptr && !(isspace(*ptr) || *ptr == ','); ptr++)
79 if (dest && dest < dest_end)
87 static void handle_basic_params(HTTPAuthState *state, const char *key,
88 int key_len, char **dest, int *dest_len)
90 if (!strncmp(key, "realm=", key_len)) {
92 *dest_len = sizeof(state->realm);
96 static void handle_digest_params(HTTPAuthState *state, const char *key,
97 int key_len, char **dest, int *dest_len)
99 DigestParams *digest = &state->digest_params;
101 if (!strncmp(key, "realm=", key_len)) {
102 *dest = state->realm;
103 *dest_len = sizeof(state->realm);
104 } else if (!strncmp(key, "nonce=", key_len)) {
105 *dest = digest->nonce;
106 *dest_len = sizeof(digest->nonce);
107 } else if (!strncmp(key, "opaque=", key_len)) {
108 *dest = digest->opaque;
109 *dest_len = sizeof(digest->opaque);
110 } else if (!strncmp(key, "algorithm=", key_len)) {
111 *dest = digest->algorithm;
112 *dest_len = sizeof(digest->algorithm);
113 } else if (!strncmp(key, "qop=", key_len)) {
115 *dest_len = sizeof(digest->qop);
119 static void handle_digest_update(HTTPAuthState *state, const char *key,
120 int key_len, char **dest, int *dest_len)
122 DigestParams *digest = &state->digest_params;
124 if (!strncmp(key, "nextnonce=", key_len)) {
125 *dest = digest->nonce;
126 *dest_len = sizeof(digest->nonce);
130 static void choose_qop(char *qop, int size)
132 char *ptr = strstr(qop, "auth");
133 char *end = ptr + strlen("auth");
135 if (ptr && (!*end || isspace(*end) || *end == ',') &&
136 (ptr == qop || isspace(ptr[-1]) || ptr[-1] == ',')) {
137 av_strlcpy(qop, "auth", size);
143 void ff_http_auth_handle_header(HTTPAuthState *state, const char *key,
146 if (!strcmp(key, "WWW-Authenticate")) {
148 if (av_stristart(value, "Basic ", &p) &&
149 state->auth_type <= HTTP_AUTH_BASIC) {
150 state->auth_type = HTTP_AUTH_BASIC;
152 parse_key_value(p, handle_basic_params, state);
153 } else if (av_stristart(value, "Digest ", &p) &&
154 state->auth_type <= HTTP_AUTH_DIGEST) {
155 state->auth_type = HTTP_AUTH_DIGEST;
156 memset(&state->digest_params, 0, sizeof(DigestParams));
158 parse_key_value(p, handle_digest_params, state);
159 choose_qop(state->digest_params.qop,
160 sizeof(state->digest_params.qop));
162 } else if (!strcmp(key, "Authentication-Info")) {
163 parse_key_value(value, handle_digest_update, state);
168 static void update_md5_strings(struct AVMD5 *md5ctx, ...)
172 va_start(vl, md5ctx);
174 const char* str = va_arg(vl, const char*);
177 av_md5_update(md5ctx, str, strlen(str));
182 /* Generate a digest reply, according to RFC 2617. */
183 static char *make_digest_auth(HTTPAuthState *state, const char *username,
184 const char *password, const char *uri,
187 DigestParams *digest = &state->digest_params;
189 uint32_t cnonce_buf[2];
193 char A1hash[33], A2hash[33], response[33];
194 struct AVMD5 *md5ctx;
199 snprintf(nc, sizeof(nc), "%08x", digest->nc);
201 /* Generate a client nonce. */
202 for (i = 0; i < 2; i++)
203 cnonce_buf[i] = av_get_random_seed();
204 ff_data_to_hex(cnonce, (const uint8_t*) cnonce_buf, sizeof(cnonce_buf), 1);
205 cnonce[2*sizeof(cnonce_buf)] = 0;
207 md5ctx = av_malloc(av_md5_size);
212 update_md5_strings(md5ctx, username, ":", state->realm, ":", password, NULL);
213 av_md5_final(md5ctx, hash);
214 ff_data_to_hex(A1hash, hash, 16, 1);
217 if (!strcmp(digest->algorithm, "") || !strcmp(digest->algorithm, "MD5")) {
218 } else if (!strcmp(digest->algorithm, "MD5-sess")) {
220 update_md5_strings(md5ctx, A1hash, ":", digest->nonce, ":", cnonce, NULL);
221 av_md5_final(md5ctx, hash);
222 ff_data_to_hex(A1hash, hash, 16, 1);
225 /* Unsupported algorithm */
231 update_md5_strings(md5ctx, method, ":", uri, NULL);
232 av_md5_final(md5ctx, hash);
233 ff_data_to_hex(A2hash, hash, 16, 1);
237 update_md5_strings(md5ctx, A1hash, ":", digest->nonce, NULL);
238 if (!strcmp(digest->qop, "auth") || !strcmp(digest->qop, "auth-int")) {
239 update_md5_strings(md5ctx, ":", nc, ":", cnonce, ":", digest->qop, NULL);
241 update_md5_strings(md5ctx, ":", A2hash, NULL);
242 av_md5_final(md5ctx, hash);
243 ff_data_to_hex(response, hash, 16, 1);
248 if (!strcmp(digest->qop, "") || !strcmp(digest->qop, "auth")) {
249 } else if (!strcmp(digest->qop, "auth-int")) {
250 /* qop=auth-int not supported */
253 /* Unsupported qop value. */
257 len = strlen(username) + strlen(state->realm) + strlen(digest->nonce) +
258 strlen(uri) + strlen(response) + strlen(digest->algorithm) +
259 strlen(digest->opaque) + strlen(digest->qop) + strlen(cnonce) +
262 authstr = av_malloc(len);
265 snprintf(authstr, len, "Authorization: Digest ");
267 /* TODO: Escape the quoted strings properly. */
268 av_strlcatf(authstr, len, "username=\"%s\"", username);
269 av_strlcatf(authstr, len, ",realm=\"%s\"", state->realm);
270 av_strlcatf(authstr, len, ",nonce=\"%s\"", digest->nonce);
271 av_strlcatf(authstr, len, ",uri=\"%s\"", uri);
272 av_strlcatf(authstr, len, ",response=\"%s\"", response);
273 if (digest->algorithm[0])
274 av_strlcatf(authstr, len, ",algorithm=%s", digest->algorithm);
275 if (digest->opaque[0])
276 av_strlcatf(authstr, len, ",opaque=\"%s\"", digest->opaque);
277 if (digest->qop[0]) {
278 av_strlcatf(authstr, len, ",qop=\"%s\"", digest->qop);
279 av_strlcatf(authstr, len, ",cnonce=\"%s\"", cnonce);
280 av_strlcatf(authstr, len, ",nc=%s", nc);
283 av_strlcatf(authstr, len, "\r\n");
288 char *ff_http_auth_create_response(HTTPAuthState *state, const char *auth,
289 const char *path, const char *method)
291 char *authstr = NULL;
293 if (!auth || !strchr(auth, ':'))
296 if (state->auth_type == HTTP_AUTH_BASIC) {
297 int auth_b64_len = (strlen(auth) + 2) / 3 * 4 + 1;
298 int len = auth_b64_len + 30;
300 authstr = av_malloc(len);
303 snprintf(authstr, len, "Authorization: Basic ");
304 ptr = authstr + strlen(authstr);
305 av_base64_encode(ptr, auth_b64_len, auth, strlen(auth));
306 av_strlcat(ptr, "\r\n", len);
307 } else if (state->auth_type == HTTP_AUTH_DIGEST) {
308 char *username = av_strdup(auth), *password;
313 if ((password = strchr(username, ':'))) {
315 authstr = make_digest_auth(state, username, password, path, method);