* HTTP authentication
* Copyright (c) 2010 Martin Storsjo
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; 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"
#include <ctype.h>
-static void parse_key_value(const char *params,
- void (*callback_get_buf)(HTTPAuthState *state,
- const char *key, int key_len,
- char **dest, int *dest_len), HTTPAuthState *state)
+static void handle_basic_params(HTTPAuthState *state, const char *key,
+ int key_len, char **dest, int *dest_len)
{
- const char *ptr = params;
-
- /* Parse key=value pairs. */
- for (;;) {
- const char *key;
- char *dest = NULL, *dest_end;
- int key_len, dest_len = 0;
-
- /* Skip whitespace and potential commas. */
- while (*ptr && (isspace(*ptr) || *ptr == ','))
- ptr++;
- if (!*ptr)
- break;
-
- key = ptr;
-
- if (!(ptr = strchr(key, '=')))
- break;
- ptr++;
- key_len = ptr - key;
-
- callback_get_buf(state, key, key_len, &dest, &dest_len);
- dest_end = dest + dest_len - 1;
-
- if (*ptr == '\"') {
- ptr++;
- while (*ptr && *ptr != '\"') {
- if (*ptr == '\\') {
- if (!ptr[1])
- break;
- if (dest && dest < dest_end)
- *dest++ = ptr[1];
- ptr += 2;
- } else {
- if (dest && dest < dest_end)
- *dest++ = *ptr;
- ptr++;
- }
- }
- if (*ptr == '\"')
- ptr++;
- } else {
- for (; *ptr && !(isspace(*ptr) || *ptr == ','); ptr++)
- if (dest && dest < dest_end)
- *dest++ = *ptr;
- }
- if (dest)
- *dest = 0;
+ if (!strncmp(key, "realm=", key_len)) {
+ *dest = state->realm;
+ *dest_len = sizeof(state->realm);
}
}
-static void handle_basic_params(HTTPAuthState *state, const char *key,
- int key_len, char **dest, int *dest_len)
+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 || isspace(*end) || *end == ',') &&
+ (ptr == qop || 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 (!state)
- return;
-
- if (!strcmp(key, "WWW-Authenticate")) {
+ 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;
- parse_key_value(p, handle_basic_params, state);
+ 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_malloc(av_md5_size);
+ 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);
+ 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,
{
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 = (strlen(auth) + 2) / 3 * 4 + 1;
- int len = auth_b64_len + 30;
- char *ptr;
+ 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)
+ if (!authstr) {
+ av_free(decoded_auth);
return NULL;
+ }
+
snprintf(authstr, len, "Authorization: Basic ");
ptr = authstr + strlen(authstr);
- av_base64_encode(ptr, auth_b64_len, auth, strlen(auth));
- av_strlcat(ptr, "\r\n", len);
+ 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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