[0] | 1 | //auth.c: |
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| 2 | |
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[690] | 3 | /* |
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[5381] | 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008-2012 |
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[690] | 5 | * |
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| 6 | * This file is part of libroar a part of RoarAudio, |
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| 7 | * a cross-platform sound system for both, home and professional use. |
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| 8 | * See README for details. |
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| 9 | * |
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| 10 | * This file is free software; you can redistribute it and/or modify |
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| 11 | * it under the terms of the GNU General Public License version 3 |
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| 12 | * as published by the Free Software Foundation. |
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| 13 | * |
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| 14 | * libroar is distributed in the hope that it will be useful, |
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | * GNU General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with this software; see the file COPYING. If not, write to |
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[3517] | 21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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| 22 | * Boston, MA 02110-1301, USA. |
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[690] | 23 | * |
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| 24 | * NOTE for everyone want's to change something and send patches: |
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| 25 | * read README and HACKING! There a addition information on |
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| 26 | * the license of this document you need to read before you send |
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| 27 | * any patches. |
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| 28 | * |
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| 29 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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| 30 | * or libpulse*: |
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| 31 | * The libs libroaresd, libroararts and libroarpulse link this lib |
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[3740] | 32 | * and are therefore GPL. Because of this it may be illegal to use |
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[690] | 33 | * them with any software that uses libesd, libartsc or libpulse*. |
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| 34 | */ |
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| 35 | |
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[0] | 36 | #include "libroar.h" |
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| 37 | |
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[3220] | 38 | /* How auth works: |
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| 39 | * 0) set stage to zero |
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| 40 | * 1) get server address and local node name (from uname()) |
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| 41 | * 2) look up authfile/authdb/authservice for the server+local address + stage. |
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| 42 | * if no data was found send NONE-Auth. |
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| 43 | * 3) send data to server |
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| 44 | * 4) read answer from server |
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| 45 | * 5) if stage of server response is non-zero increment stage to server stage+1 |
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| 46 | * and repeat from step 2) |
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[3740] | 47 | * 6) check if we got an OK or an ERROR, return correct value |
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[3220] | 48 | */ |
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| 49 | |
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| 50 | /* The protocol: |
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| 51 | * Auth request: |
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| 52 | * Byte 0: auth type |
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| 53 | * Byte 1: stage |
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| 54 | * Byte 2: reserved (must be zero) |
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| 55 | * Byte 3: reserved (must be zero) |
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| 56 | * Byte 4-end: auth type depending data. |
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| 57 | * |
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| 58 | * If no data is to be send bytes 2 and 3 can be omitted. |
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| 59 | * If no data is to be send and stage is zero bytes 1, 2 and 3 can be omitted. |
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| 60 | * |
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| 61 | * Auth response: |
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| 62 | * The same as the auth request. |
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[3227] | 63 | * if the server sends an zero size message back it means the server accepted our connection |
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| 64 | * and no additional stage is needed. |
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[3220] | 65 | * if the message type is OK the server accepted our auth. |
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[3740] | 66 | * if the message type is ERROR the server rejected us. we may try other auth methods. |
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[3220] | 67 | * if the server accepted our data and the stage is non-zero we need to continue with the next |
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| 68 | * stage of the auth. |
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| 69 | * if the server rejected us the auth type value of the response is a suggested next auth type |
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| 70 | * we should try if possible. This may help the client to find a working auth type. |
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| 71 | */ |
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| 72 | |
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| 73 | /* The protocol by auth type: |
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| 74 | * |
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| 75 | * --- NONE: |
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| 76 | * No data is send, the server accepts the connect or rejects it depending on some |
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| 77 | * magic within the server. we do not care about this. |
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| 78 | * The data block is not used. |
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| 79 | * |
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| 80 | * --- COOKIE: |
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| 81 | * We send cookies for all stages the server ask us to provide a cookie. |
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[3740] | 82 | * if a cookie is wrong the server rejects us or asks us for another. |
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[3220] | 83 | * The cookie is send as binary data in the data block. |
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| 84 | * |
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| 85 | * --- TRUST: |
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[3740] | 86 | * We ask the server to auth us based on our UID/GID/PID. |
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| 87 | * The server may reject this because we are not allowed or because it is not |
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[3220] | 88 | * supported by the transport. |
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| 89 | * If we get rejected we may try to continue with IDENT then RHOST before we use NONE. |
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| 90 | * The data block is not used. |
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| 91 | * |
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| 92 | * --- PASSWORD: |
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[3740] | 93 | * This is technically the same as COOKIE just that the cookie is limited to |
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[3220] | 94 | * printable ASCII chars and that the user should be asked to provide the password. |
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| 95 | * This may be done via a GUI popup window. |
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| 96 | * |
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| 97 | * --- SYSUSER: |
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| 98 | * We provide a Username + Password for a system user. |
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| 99 | * The data block contains of two main parts: |
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| 100 | * The first part is a one byte long subtype. |
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| 101 | * The value must be 0x01 for username+password. |
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[3740] | 102 | * future versions may define other types. |
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| 103 | * the second part is the actual data block. |
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[3220] | 104 | * for username+password it is splited into two fields, both terminated with \0. |
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| 105 | * the first is the username the last one the password as clear text. |
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| 106 | * Example: char data[] = "\001MyUser\0MyPassword\0"; |
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| 107 | * |
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| 108 | * --- OPENPGP_SIGN: |
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| 109 | * |
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| 110 | * --- OPENPGP_ENCRYPT: |
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| 111 | * |
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| 112 | * --- OPENPGP_AUTH: |
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| 113 | * |
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| 114 | * --- KERBEROS: |
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| 115 | * We use Kerberos to auth. |
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| 116 | * |
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| 117 | * --- RHOST: |
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| 118 | * The server is asked to auth us based on our source address. |
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| 119 | * The data block is not used. |
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| 120 | * |
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| 121 | * --- XAUTH: |
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| 122 | * We send an X11 Cookie. |
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| 123 | * |
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| 124 | * --- IDENT: |
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| 125 | * The server is asked to auth us based on our source address using the IDENT protocol. |
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| 126 | * The data block is not used. |
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| 127 | * |
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| 128 | */ |
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| 129 | |
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[3227] | 130 | static int roar_auth_ask_server (struct roar_connection * con, struct roar_auth_message * authmes) { |
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[4745] | 131 | struct roar_error_frame error_frame; |
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| 132 | struct roar_message mes; |
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| 133 | char * header = mes.data; |
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| 134 | int ret; |
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[4790] | 135 | char * data = NULL; |
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[0] | 136 | |
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[5146] | 137 | ROAR_DBG("roar_auth_ask_server(con=%p, authmes=%p{.type=%i}) = ?", con, authmes, authmes->type); |
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| 138 | |
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| 139 | roar_err_init(&error_frame); |
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[131] | 140 | memset(&mes, 0, sizeof(struct roar_message)); // make valgrind happy! |
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| 141 | |
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[0] | 142 | mes.cmd = ROAR_CMD_AUTH; |
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[5144] | 143 | mes.stream = -1; |
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| 144 | mes.datalen = 4 + authmes->len; |
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[4788] | 145 | |
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[4790] | 146 | if ( mes.datalen > sizeof(mes.data) ) { |
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[5295] | 147 | data = roar_mm_malloc(mes.datalen); |
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[4790] | 148 | if ( data == NULL ) |
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| 149 | return -1; |
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| 150 | |
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| 151 | header = data; |
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| 152 | } |
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[3227] | 153 | |
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| 154 | header[0] = authmes->type; |
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| 155 | header[1] = authmes->stage; |
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| 156 | header[2] = authmes->reserved.c[0]; |
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| 157 | header[3] = authmes->reserved.c[1]; |
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| 158 | |
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[4788] | 159 | if ( authmes->len ) { |
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[4790] | 160 | if ( data == NULL ) { |
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| 161 | memcpy(mes.data + 4, authmes->data, authmes->len); |
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| 162 | } else { |
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| 163 | memcpy(data + 4, authmes->data, authmes->len); |
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| 164 | } |
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[4788] | 165 | } |
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| 166 | |
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[5146] | 167 | ROAR_DBG("roar_auth_ask_server(con=%p, authmes=%p{.type=%i}) = ?", con, authmes, authmes->type); |
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| 168 | |
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| 169 | if ( (ret = roar_req2(con, &mes, &data, &error_frame)) == -1 ) { |
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[4745] | 170 | authmes->type = -1; |
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[5146] | 171 | ROAR_DBG("roar_auth_ask_server(con=%p, authmes=%p) = -1 // next: -1", con, authmes, authmes->type); |
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[3227] | 172 | return -1; |
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[4745] | 173 | } |
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[3227] | 174 | |
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[5146] | 175 | ROAR_DBG("roar_auth_ask_server(con=%p, authmes=%p{.type=%i}): mes->cmd=%i", con, authmes, authmes->type, mes.cmd); |
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| 176 | |
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[4790] | 177 | if ( data != NULL ) { |
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| 178 | header = data; |
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| 179 | } else { |
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| 180 | header = mes.data; |
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| 181 | } |
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| 182 | |
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[5146] | 183 | if ( mes.cmd == ROAR_CMD_ERROR ) |
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| 184 | ret = -1; |
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[4790] | 185 | |
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[5146] | 186 | ROAR_DBG("roar_auth_ask_server(con=%p, authmes=%p{.type=%i}): error_frame.data=%p", |
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| 187 | con, authmes, authmes->type, error_frame.data); |
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[4745] | 188 | |
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[5146] | 189 | if ( mes.cmd == ROAR_CMD_ERROR && error_frame.data != NULL ) { |
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[4745] | 190 | header = error_frame.data; |
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| 191 | mes.datalen = error_frame.datalen; |
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| 192 | } |
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[4473] | 193 | |
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[5146] | 194 | ROAR_DBG("roar_auth_ask_server(con=%p, authmes=%p{.type=%i}) = ?", con, authmes, authmes->type); |
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| 195 | |
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[3227] | 196 | if ( mes.datalen < 4 ) { |
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| 197 | memset(header+mes.datalen, 0, 4-mes.datalen); |
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[4745] | 198 | authmes->type = -1; |
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| 199 | } else { |
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| 200 | authmes->type = header[0]; |
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[3227] | 201 | } |
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| 202 | |
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[5146] | 203 | ROAR_DBG("roar_auth_ask_server(con=%p, authmes=%p) = ?", con, authmes); |
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| 204 | |
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[3227] | 205 | authmes->stage = header[1]; |
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| 206 | authmes->reserved.c[0] = header[2]; |
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| 207 | authmes->reserved.c[1] = header[3]; |
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| 208 | |
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[4790] | 209 | if ( data != NULL ) |
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[5295] | 210 | roar_mm_free(data); |
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[4790] | 211 | |
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[5146] | 212 | ROAR_DBG("roar_auth_ask_server(con=%p, authmes=%p) = %i // next: %i", con, authmes, ret, authmes->type); |
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[4745] | 213 | return ret; |
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[3227] | 214 | } |
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[0] | 215 | |
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[3227] | 216 | static void roar_auth_mes_init(struct roar_auth_message * authmes, int type) { |
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| 217 | memset(authmes, 0, sizeof(struct roar_auth_message)); |
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| 218 | |
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| 219 | authmes->type = type; |
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| 220 | authmes->stage = 0; |
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| 221 | authmes->data = NULL; |
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| 222 | authmes->len = 0; |
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| 223 | } |
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| 224 | |
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[4475] | 225 | |
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[4745] | 226 | static int try_password (struct roar_connection * con, int * next) { |
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[4475] | 227 | struct roar_message mes; |
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| 228 | struct roar_auth_message authmes; |
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| 229 | char * pw; |
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| 230 | |
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[4745] | 231 | // TODO: add support for *next. |
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| 232 | |
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[4475] | 233 | roar_auth_mes_init(&authmes, ROAR_AUTH_T_PASSWORD); |
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| 234 | |
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| 235 | if ( roar_passwd_simple_ask_pw(&pw, "Password for RoarAudio Server?", NULL) == -1 ) { |
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| 236 | return -1; |
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| 237 | } |
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| 238 | |
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| 239 | authmes.len = strlen(pw); |
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| 240 | |
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| 241 | if ( roar_auth_init_mes(&mes, &authmes) == -1 ) { |
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| 242 | roar_mm_free(pw); |
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| 243 | return -1; |
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| 244 | } |
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| 245 | |
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| 246 | // do not use strcpy() because that would copy \0, too. |
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| 247 | memcpy(authmes.data, pw, authmes.len); |
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| 248 | |
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| 249 | roar_mm_free(pw); |
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| 250 | |
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| 251 | if ( roar_req(con, &mes, NULL) == -1 ) |
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| 252 | return -1; |
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| 253 | |
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| 254 | if ( mes.cmd != ROAR_CMD_OK ) |
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| 255 | return -1; |
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| 256 | |
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| 257 | if ( roar_auth_from_mes(&authmes, &mes, NULL) == -1 ) |
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| 258 | return -1; |
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| 259 | |
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| 260 | if ( authmes.stage == 0 ) |
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| 261 | return 0; |
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| 262 | |
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| 263 | return -1; |
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| 264 | } |
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| 265 | |
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[4788] | 266 | static int try_cookie (struct roar_connection * con, int * next) { |
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| 267 | struct roar_libroar_config * config = roar_libroar_get_config(); |
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| 268 | struct roar_auth_message authmes; |
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| 269 | struct roar_authfile * authfile; |
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| 270 | struct roar_authfile_key * key; |
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| 271 | int idx; |
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| 272 | int done = 0; |
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| 273 | |
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| 274 | roar_auth_mes_init(&authmes, ROAR_AUTH_T_COOKIE); |
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| 275 | |
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| 276 | if ( (authfile = roar_authfile_open(ROAR_AUTHFILE_TYPE_AUTO, config->authfile, 0, ROAR_AUTHFILE_VERSION_AUTO)) == NULL ) |
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| 277 | return -1; |
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| 278 | |
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| 279 | for (idx = 0; !done; idx++) { |
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| 280 | if ( (key = roar_authfile_lookup_key(authfile, ROAR_AUTH_T_COOKIE, idx, NULL)) == NULL ) |
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| 281 | break; |
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| 282 | |
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| 283 | authmes.data = key->data; |
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| 284 | authmes.len = key->len; |
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| 285 | |
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| 286 | if ( roar_auth_ask_server(con, &authmes) != -1 ) |
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| 287 | done = 1; |
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| 288 | |
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| 289 | roar_authfile_key_unref(key); |
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| 290 | } |
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| 291 | |
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| 292 | roar_authfile_close(authfile); |
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| 293 | |
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| 294 | return done ? 0 : -1; |
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| 295 | } |
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| 296 | |
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[3228] | 297 | #define _EOL ROAR_AUTH_T_AUTO |
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[3227] | 298 | int roar_auth (struct roar_connection * con) { |
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| 299 | struct roar_auth_message authmes; |
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| 300 | int ret; |
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[3228] | 301 | int i; |
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[4745] | 302 | int cur, next; |
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| 303 | int done; |
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[3228] | 304 | int ltt[] = { |
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| 305 | ROAR_AUTH_T_TRUST, |
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| 306 | ROAR_AUTH_T_IDENT, |
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| 307 | ROAR_AUTH_T_RHOST, |
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[4486] | 308 | // ROAR_AUTH_T_PASSWORD, |
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[4788] | 309 | ROAR_AUTH_T_COOKIE, |
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[3228] | 310 | ROAR_AUTH_T_NONE, |
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[5158] | 311 | ROAR_AUTH_T_PASSWORD, // (re-)try password if there is no guest access. |
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[3228] | 312 | _EOL |
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| 313 | }; |
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[3227] | 314 | |
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[3228] | 315 | for (i = 0; ltt[i] != _EOL; i++) { |
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[4745] | 316 | next = ltt[i]; |
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[5146] | 317 | ROAR_DBG("roar_auth(con=%p): next from ltt: %s(%i)", con, roar_autht2str(next), next); |
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| 318 | |
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[4745] | 319 | while (next != -1) { |
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| 320 | done = 1; |
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| 321 | |
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| 322 | cur = next; |
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| 323 | next = -1; |
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| 324 | |
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[5146] | 325 | ROAR_DBG("roar_auth(con=%p): cur=%s(%i)", con, roar_autht2str(cur), cur); |
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| 326 | |
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[4745] | 327 | switch (cur) { |
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[4788] | 328 | case ROAR_AUTH_T_PASSWORD: |
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[4745] | 329 | if ( (ret = try_password(con, &next)) == -1 ) |
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| 330 | done = 0; |
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| 331 | break; |
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[4788] | 332 | case ROAR_AUTH_T_TRUST: |
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| 333 | case ROAR_AUTH_T_IDENT: |
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| 334 | case ROAR_AUTH_T_RHOST: |
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| 335 | case ROAR_AUTH_T_NONE: |
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[5146] | 336 | roar_auth_mes_init(&authmes, cur); |
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[4745] | 337 | if ( (ret = roar_auth_ask_server(con, &authmes)) == -1 ) |
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| 338 | done = 0; |
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| 339 | |
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| 340 | next = authmes.type; |
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[4475] | 341 | break; |
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[4788] | 342 | case ROAR_AUTH_T_COOKIE: |
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| 343 | if ( (ret = try_cookie(con, &next)) == -1 ) |
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| 344 | done = 0; |
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| 345 | break; |
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| 346 | break; |
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[4745] | 347 | default: /* Bad error! */ |
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| 348 | return -1; |
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| 349 | break; |
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| 350 | } |
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| 351 | |
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| 352 | if ( authmes.stage != 0 ) |
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| 353 | done = 0; |
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| 354 | |
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[5146] | 355 | ROAR_DBG("roar_auth(con=%p): done=%i, next=%i", con, done, next); |
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| 356 | |
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| 357 | if ( done ) { |
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| 358 | ROAR_DBG("roar_auth(con=%p) = 0", con); |
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[4745] | 359 | return 0; |
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[5146] | 360 | } |
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[4475] | 361 | } |
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[3228] | 362 | } |
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| 363 | |
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[5146] | 364 | ROAR_DBG("roar_auth(con=%p) = -1", con); |
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[3228] | 365 | return -1; |
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[0] | 366 | } |
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| 367 | |
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[4470] | 368 | |
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| 369 | int roar_auth_from_mes(struct roar_auth_message * ames, struct roar_message * mes, void * data) { |
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| 370 | void * ibuf; |
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| 371 | char header[4] = {0, 0, 0, 0}; |
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| 372 | |
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[5146] | 373 | if ( ames == NULL || mes == NULL ) { |
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| 374 | roar_err_set(ROAR_ERROR_FAULT); |
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[4470] | 375 | return -1; |
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[5146] | 376 | } |
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[4470] | 377 | |
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[4471] | 378 | if ( data != NULL ) { |
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[4470] | 379 | ibuf = data; |
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| 380 | } else { |
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| 381 | ibuf = mes->data; |
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| 382 | } |
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| 383 | |
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| 384 | memset(ames, 0, sizeof(struct roar_auth_message)); |
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| 385 | |
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| 386 | memcpy(header, ibuf, mes->datalen < 4 ? mes->datalen : 4); |
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| 387 | |
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| 388 | ames->type = header[0]; |
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| 389 | ames->stage = header[1]; |
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| 390 | ames->reserved.c[0] = header[2]; |
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| 391 | ames->reserved.c[1] = header[3]; |
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| 392 | |
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| 393 | if ( mes->datalen > 4 ) { |
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| 394 | ames->data = ibuf + 4; |
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| 395 | ames->len = mes->datalen - 4; |
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| 396 | } else { |
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| 397 | ames->data = NULL; |
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| 398 | ames->len = 0; |
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| 399 | } |
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| 400 | |
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| 401 | return 0; |
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| 402 | } |
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| 403 | |
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| 404 | int roar_auth_to_mes(struct roar_message * mes, void ** data, struct roar_auth_message * ames) { |
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| 405 | char * obuf; |
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| 406 | |
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[5146] | 407 | if ( mes == NULL || ames == NULL ) { |
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| 408 | roar_err_set(ROAR_ERROR_FAULT); |
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[4470] | 409 | return -1; |
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[5146] | 410 | } |
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[4470] | 411 | |
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| 412 | if ( data != NULL ) |
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| 413 | *data = NULL; |
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| 414 | |
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| 415 | memset(mes, 0, sizeof(struct roar_message)); |
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| 416 | |
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[4475] | 417 | mes->cmd = ROAR_CMD_AUTH; |
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| 418 | |
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[4470] | 419 | if ( (ames->len + 4) > sizeof(mes->data) ) { |
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[5295] | 420 | *data = roar_mm_malloc(ames->len + 4); |
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[4470] | 421 | if ( *data == NULL ) |
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| 422 | return -1; |
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| 423 | obuf = *data; |
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| 424 | } else { |
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| 425 | obuf = mes->data; |
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| 426 | } |
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| 427 | |
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| 428 | obuf[0] = ames->type; |
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| 429 | obuf[1] = ames->stage; |
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| 430 | obuf[2] = ames->reserved.c[0]; |
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| 431 | obuf[3] = ames->reserved.c[1]; |
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| 432 | |
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| 433 | memcpy(obuf + 8, ames->data, ames->len); |
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| 434 | |
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| 435 | mes->datalen = ames->len + 4; |
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| 436 | |
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| 437 | return 0; |
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| 438 | } |
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| 439 | |
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| 440 | int roar_auth_init_mes(struct roar_message * mes, struct roar_auth_message * ames) { |
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| 441 | if ( mes == NULL || ames == NULL ) |
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| 442 | return -1; |
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| 443 | |
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| 444 | if ( (ames->len + 4) > sizeof(mes->data) ) |
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| 445 | return -1; |
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| 446 | |
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| 447 | memset(mes, 0, sizeof(struct roar_message)); |
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| 448 | |
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[4475] | 449 | mes->cmd = ROAR_CMD_AUTH; |
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| 450 | |
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[4470] | 451 | mes->data[0] = ames->type; |
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| 452 | mes->data[1] = ames->stage; |
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| 453 | mes->data[2] = ames->reserved.c[0]; |
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| 454 | mes->data[3] = ames->reserved.c[1]; |
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| 455 | |
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| 456 | ames->data = &(mes->data[4]); |
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| 457 | |
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| 458 | mes->datalen = ames->len + 4; |
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| 459 | |
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| 460 | return 0; |
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| 461 | } |
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| 462 | |
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| 463 | |
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| 464 | |
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[3225] | 465 | // String functions: |
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| 466 | static struct { |
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| 467 | int type; |
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[4296] | 468 | const char * name; |
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[3225] | 469 | } _g_authts[] = { |
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| 470 | // grep ^'#define ROAR_AUTH_T_' auth.h | while read d t d; do n=$(cut -d_ -f4 <<<$t | tr A-Z a-z); printf ' {%-28s %-10s},\n' $t, \"$n\"; done |
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| 471 | {ROAR_AUTH_T_NONE, "none" }, |
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| 472 | {ROAR_AUTH_T_COOKIE, "cookie" }, |
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| 473 | {ROAR_AUTH_T_TRUST, "trust" }, |
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| 474 | {ROAR_AUTH_T_PASSWORD, "password"}, |
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| 475 | {ROAR_AUTH_T_SYSUSER, "sysuser" }, |
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| 476 | {ROAR_AUTH_T_OPENPGP_SIGN, "openpgp" }, |
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| 477 | {ROAR_AUTH_T_OPENPGP_ENCRYPT, "openpgp" }, |
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| 478 | {ROAR_AUTH_T_OPENPGP_AUTH, "openpgp" }, |
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| 479 | {ROAR_AUTH_T_KERBEROS, "kerberos"}, |
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| 480 | {ROAR_AUTH_T_RHOST, "rhost" }, |
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| 481 | {ROAR_AUTH_T_XAUTH, "xauth" }, |
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| 482 | {ROAR_AUTH_T_IDENT, "ident" }, |
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| 483 | {-1, NULL} |
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| 484 | }; |
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| 485 | |
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[4296] | 486 | int roar_str2autht(const char * str) { |
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[3225] | 487 | int i; |
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| 488 | |
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| 489 | for (i = 0; _g_authts[i].name != NULL; i++) |
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| 490 | if ( !strcasecmp(_g_authts[i].name, str) ) |
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| 491 | return _g_authts[i].type; |
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| 492 | |
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| 493 | return -1; |
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| 494 | } |
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| 495 | |
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[4296] | 496 | const char * roar_autht2str(const int auth) { |
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[3225] | 497 | int i; |
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| 498 | |
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| 499 | for (i = 0; _g_authts[i].name != NULL; i++) |
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| 500 | if ( _g_authts[i].type == auth ) |
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| 501 | return _g_authts[i].name; |
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| 502 | |
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| 503 | return "(UNKNOWN)"; |
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| 504 | } |
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| 505 | |
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[0] | 506 | //ll |
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