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| Rev | Author | Line No. | Line |
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| 4349 | Serge | 1 | /* |
| 2 | * HTTP authentication |
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| 3 | * Copyright (c) 2010 Martin Storsjo |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include "httpauth.h" |
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| 23 | #include "libavutil/base64.h" |
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| 24 | #include "libavutil/avstring.h" |
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| 25 | #include "internal.h" |
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| 26 | #include "libavutil/random_seed.h" |
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| 27 | #include "libavutil/md5.h" |
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| 28 | #include "urldecode.h" |
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| 29 | #include "avformat.h" |
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| 30 | |||
| 31 | static void handle_basic_params(HTTPAuthState *state, const char *key, |
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| 32 | int key_len, char **dest, int *dest_len) |
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| 33 | { |
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| 34 | if (!strncmp(key, "realm=", key_len)) { |
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| 35 | *dest = state->realm; |
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| 36 | *dest_len = sizeof(state->realm); |
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| 37 | } |
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| 38 | } |
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| 39 | |||
| 40 | static void handle_digest_params(HTTPAuthState *state, const char *key, |
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| 41 | int key_len, char **dest, int *dest_len) |
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| 42 | { |
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| 43 | DigestParams *digest = &state->digest_params; |
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| 44 | |||
| 45 | if (!strncmp(key, "realm=", key_len)) { |
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| 46 | *dest = state->realm; |
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| 47 | *dest_len = sizeof(state->realm); |
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| 48 | } else if (!strncmp(key, "nonce=", key_len)) { |
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| 49 | *dest = digest->nonce; |
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| 50 | *dest_len = sizeof(digest->nonce); |
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| 51 | } else if (!strncmp(key, "opaque=", key_len)) { |
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| 52 | *dest = digest->opaque; |
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| 53 | *dest_len = sizeof(digest->opaque); |
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| 54 | } else if (!strncmp(key, "algorithm=", key_len)) { |
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| 55 | *dest = digest->algorithm; |
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| 56 | *dest_len = sizeof(digest->algorithm); |
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| 57 | } else if (!strncmp(key, "qop=", key_len)) { |
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| 58 | *dest = digest->qop; |
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| 59 | *dest_len = sizeof(digest->qop); |
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| 60 | } else if (!strncmp(key, "stale=", key_len)) { |
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| 61 | *dest = digest->stale; |
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| 62 | *dest_len = sizeof(digest->stale); |
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| 63 | } |
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| 64 | } |
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| 65 | |||
| 66 | static void handle_digest_update(HTTPAuthState *state, const char *key, |
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| 67 | int key_len, char **dest, int *dest_len) |
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| 68 | { |
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| 69 | DigestParams *digest = &state->digest_params; |
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| 70 | |||
| 71 | if (!strncmp(key, "nextnonce=", key_len)) { |
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| 72 | *dest = digest->nonce; |
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| 73 | *dest_len = sizeof(digest->nonce); |
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| 74 | } |
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| 75 | } |
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| 76 | |||
| 77 | static void choose_qop(char *qop, int size) |
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| 78 | { |
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| 79 | char *ptr = strstr(qop, "auth"); |
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| 80 | char *end = ptr + strlen("auth"); |
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| 81 | |||
| 82 | if (ptr && (!*end || av_isspace(*end) || *end == ',') && |
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| 83 | (ptr == qop || av_isspace(ptr[-1]) || ptr[-1] == ',')) { |
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| 84 | av_strlcpy(qop, "auth", size); |
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| 85 | } else { |
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| 86 | qop[0] = 0; |
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| 87 | } |
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| 88 | } |
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| 89 | |||
| 90 | void ff_http_auth_handle_header(HTTPAuthState *state, const char *key, |
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| 91 | const char *value) |
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| 92 | { |
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| 93 | if (!strcmp(key, "WWW-Authenticate") || !strcmp(key, "Proxy-Authenticate")) { |
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| 94 | const char *p; |
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| 95 | if (av_stristart(value, "Basic ", &p) && |
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| 96 | state->auth_type <= HTTP_AUTH_BASIC) { |
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| 97 | state->auth_type = HTTP_AUTH_BASIC; |
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| 98 | state->realm[0] = 0; |
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| 99 | state->stale = 0; |
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| 100 | ff_parse_key_value(p, (ff_parse_key_val_cb) handle_basic_params, |
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| 101 | state); |
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| 102 | } else if (av_stristart(value, "Digest ", &p) && |
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| 103 | state->auth_type <= HTTP_AUTH_DIGEST) { |
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| 104 | state->auth_type = HTTP_AUTH_DIGEST; |
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| 105 | memset(&state->digest_params, 0, sizeof(DigestParams)); |
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| 106 | state->realm[0] = 0; |
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| 107 | state->stale = 0; |
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| 108 | ff_parse_key_value(p, (ff_parse_key_val_cb) handle_digest_params, |
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| 109 | state); |
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| 110 | choose_qop(state->digest_params.qop, |
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| 111 | sizeof(state->digest_params.qop)); |
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| 112 | if (!av_strcasecmp(state->digest_params.stale, "true")) |
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| 113 | state->stale = 1; |
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| 114 | } |
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| 115 | } else if (!strcmp(key, "Authentication-Info")) { |
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| 116 | ff_parse_key_value(value, (ff_parse_key_val_cb) handle_digest_update, |
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| 117 | state); |
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| 118 | } |
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| 119 | } |
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| 120 | |||
| 121 | |||
| 122 | static void update_md5_strings(struct AVMD5 *md5ctx, ...) |
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| 123 | { |
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| 124 | va_list vl; |
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| 125 | |||
| 126 | va_start(vl, md5ctx); |
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| 127 | while (1) { |
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| 128 | const char* str = va_arg(vl, const char*); |
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| 129 | if (!str) |
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| 130 | break; |
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| 131 | av_md5_update(md5ctx, str, strlen(str)); |
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| 132 | } |
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| 133 | va_end(vl); |
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| 134 | } |
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| 135 | |||
| 136 | /* Generate a digest reply, according to RFC 2617. */ |
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| 137 | static char *make_digest_auth(HTTPAuthState *state, const char *username, |
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| 138 | const char *password, const char *uri, |
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| 139 | const char *method) |
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| 140 | { |
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| 141 | DigestParams *digest = &state->digest_params; |
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| 142 | int len; |
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| 143 | uint32_t cnonce_buf[2]; |
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| 144 | char cnonce[17]; |
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| 145 | char nc[9]; |
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| 146 | int i; |
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| 147 | char A1hash[33], A2hash[33], response[33]; |
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| 148 | struct AVMD5 *md5ctx; |
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| 149 | uint8_t hash[16]; |
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| 150 | char *authstr; |
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| 151 | |||
| 152 | digest->nc++; |
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| 153 | snprintf(nc, sizeof(nc), "%08x", digest->nc); |
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| 154 | |||
| 155 | /* Generate a client nonce. */ |
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| 156 | for (i = 0; i < 2; i++) |
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| 157 | cnonce_buf[i] = av_get_random_seed(); |
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| 158 | ff_data_to_hex(cnonce, (const uint8_t*) cnonce_buf, sizeof(cnonce_buf), 1); |
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| 159 | cnonce[2*sizeof(cnonce_buf)] = 0; |
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| 160 | |||
| 161 | md5ctx = av_md5_alloc(); |
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| 162 | if (!md5ctx) |
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| 163 | return NULL; |
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| 164 | |||
| 165 | av_md5_init(md5ctx); |
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| 166 | update_md5_strings(md5ctx, username, ":", state->realm, ":", password, NULL); |
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| 167 | av_md5_final(md5ctx, hash); |
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| 168 | ff_data_to_hex(A1hash, hash, 16, 1); |
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| 169 | A1hash[32] = 0; |
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| 170 | |||
| 171 | if (!strcmp(digest->algorithm, "") || !strcmp(digest->algorithm, "MD5")) { |
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| 172 | } else if (!strcmp(digest->algorithm, "MD5-sess")) { |
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| 173 | av_md5_init(md5ctx); |
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| 174 | update_md5_strings(md5ctx, A1hash, ":", digest->nonce, ":", cnonce, NULL); |
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| 175 | av_md5_final(md5ctx, hash); |
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| 176 | ff_data_to_hex(A1hash, hash, 16, 1); |
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| 177 | A1hash[32] = 0; |
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| 178 | } else { |
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| 179 | /* Unsupported algorithm */ |
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| 180 | av_free(md5ctx); |
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| 181 | return NULL; |
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| 182 | } |
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| 183 | |||
| 184 | av_md5_init(md5ctx); |
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| 185 | update_md5_strings(md5ctx, method, ":", uri, NULL); |
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| 186 | av_md5_final(md5ctx, hash); |
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| 187 | ff_data_to_hex(A2hash, hash, 16, 1); |
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| 188 | A2hash[32] = 0; |
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| 189 | |||
| 190 | av_md5_init(md5ctx); |
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| 191 | update_md5_strings(md5ctx, A1hash, ":", digest->nonce, NULL); |
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| 192 | if (!strcmp(digest->qop, "auth") || !strcmp(digest->qop, "auth-int")) { |
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| 193 | update_md5_strings(md5ctx, ":", nc, ":", cnonce, ":", digest->qop, NULL); |
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| 194 | } |
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| 195 | update_md5_strings(md5ctx, ":", A2hash, NULL); |
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| 196 | av_md5_final(md5ctx, hash); |
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| 197 | ff_data_to_hex(response, hash, 16, 1); |
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| 198 | response[32] = 0; |
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| 199 | |||
| 200 | av_free(md5ctx); |
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| 201 | |||
| 202 | if (!strcmp(digest->qop, "") || !strcmp(digest->qop, "auth")) { |
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| 203 | } else if (!strcmp(digest->qop, "auth-int")) { |
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| 204 | /* qop=auth-int not supported */ |
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| 205 | return NULL; |
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| 206 | } else { |
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| 207 | /* Unsupported qop value. */ |
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| 208 | return NULL; |
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| 209 | } |
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| 210 | |||
| 211 | len = strlen(username) + strlen(state->realm) + strlen(digest->nonce) + |
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| 212 | strlen(uri) + strlen(response) + strlen(digest->algorithm) + |
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| 213 | strlen(digest->opaque) + strlen(digest->qop) + strlen(cnonce) + |
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| 214 | strlen(nc) + 150; |
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| 215 | |||
| 216 | authstr = av_malloc(len); |
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| 217 | if (!authstr) |
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| 218 | return NULL; |
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| 219 | snprintf(authstr, len, "Authorization: Digest "); |
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| 220 | |||
| 221 | /* TODO: Escape the quoted strings properly. */ |
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| 222 | av_strlcatf(authstr, len, "username=\"%s\"", username); |
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| 223 | av_strlcatf(authstr, len, ",realm=\"%s\"", state->realm); |
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| 224 | av_strlcatf(authstr, len, ",nonce=\"%s\"", digest->nonce); |
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| 225 | av_strlcatf(authstr, len, ",uri=\"%s\"", uri); |
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| 226 | av_strlcatf(authstr, len, ",response=\"%s\"", response); |
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| 227 | if (digest->algorithm[0]) |
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| 228 | av_strlcatf(authstr, len, ",algorithm=%s", digest->algorithm); |
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| 229 | if (digest->opaque[0]) |
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| 230 | av_strlcatf(authstr, len, ",opaque=\"%s\"", digest->opaque); |
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| 231 | if (digest->qop[0]) { |
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| 232 | av_strlcatf(authstr, len, ",qop=\"%s\"", digest->qop); |
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| 233 | av_strlcatf(authstr, len, ",cnonce=\"%s\"", cnonce); |
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| 234 | av_strlcatf(authstr, len, ",nc=%s", nc); |
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| 235 | } |
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| 236 | |||
| 237 | av_strlcatf(authstr, len, "\r\n"); |
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| 238 | |||
| 239 | return authstr; |
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| 240 | } |
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| 241 | |||
| 242 | char *ff_http_auth_create_response(HTTPAuthState *state, const char *auth, |
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| 243 | const char *path, const char *method) |
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| 244 | { |
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| 245 | char *authstr = NULL; |
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| 246 | |||
| 247 | /* Clear the stale flag, we assume the auth is ok now. It is reset |
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| 248 | * by the server headers if there's a new issue. */ |
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| 249 | state->stale = 0; |
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| 250 | if (!auth || !strchr(auth, ':')) |
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| 251 | return NULL; |
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| 252 | |||
| 253 | if (state->auth_type == HTTP_AUTH_BASIC) { |
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| 254 | int auth_b64_len, len; |
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| 255 | char *ptr, *decoded_auth = ff_urldecode(auth); |
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| 256 | |||
| 257 | if (!decoded_auth) |
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| 258 | return NULL; |
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| 259 | |||
| 260 | auth_b64_len = AV_BASE64_SIZE(strlen(decoded_auth)); |
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| 261 | len = auth_b64_len + 30; |
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| 262 | |||
| 263 | authstr = av_malloc(len); |
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| 264 | if (!authstr) { |
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| 265 | av_free(decoded_auth); |
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| 266 | return NULL; |
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| 267 | } |
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| 268 | |||
| 269 | snprintf(authstr, len, "Authorization: Basic "); |
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| 270 | ptr = authstr + strlen(authstr); |
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| 271 | av_base64_encode(ptr, auth_b64_len, decoded_auth, strlen(decoded_auth)); |
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| 272 | av_strlcat(ptr, "\r\n", len - (ptr - authstr)); |
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| 273 | av_free(decoded_auth); |
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| 274 | } else if (state->auth_type == HTTP_AUTH_DIGEST) { |
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| 275 | char *username = ff_urldecode(auth), *password; |
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| 276 | |||
| 277 | if (!username) |
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| 278 | return NULL; |
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| 279 | |||
| 280 | if ((password = strchr(username, ':'))) { |
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| 281 | *password++ = 0; |
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| 282 | authstr = make_digest_auth(state, username, password, path, method); |
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| 283 | } |
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| 284 | av_free(username); |
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| 285 | } |
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| 286 | return authstr; |
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| 287 | } |