[0] | 1 | //auth.c: |
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| 2 | |
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[690] | 3 | /* |
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[3221] | 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2008-2010 |
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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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| 32 | * and are therefore GPL. Because of this it may be illigal to use |
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| 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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| 47 | * 6) check if we got an OK or an ERROR, return currect value |
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| 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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| 66 | * if the message type is ERROR the server recjected us. we may try other auth methodes. |
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| 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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| 82 | * if a cookie is wrong the server rejects us or aks us for another. |
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| 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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| 86 | * We ask the server to auth us based on ower UID/GID/PID. |
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| 87 | * The server may reject this becasue we are not allowed or because it is not |
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| 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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| 93 | * This is technikly the same as COOKIE just that the cookie is limited to |
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| 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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| 102 | * futur versions may define other types. |
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| 103 | * the secund part is the actual data block. |
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| 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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| 131 | struct roar_message mes; |
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| 132 | char * header = mes.data; |
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| 133 | int ret; |
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[0] | 134 | |
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[131] | 135 | memset(&mes, 0, sizeof(struct roar_message)); // make valgrind happy! |
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| 136 | |
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[0] | 137 | mes.cmd = ROAR_CMD_AUTH; |
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[3227] | 138 | mes.datalen = 4; |
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| 139 | |
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| 140 | header[0] = authmes->type; |
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| 141 | header[1] = authmes->stage; |
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| 142 | header[2] = authmes->reserved.c[0]; |
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| 143 | header[3] = authmes->reserved.c[1]; |
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| 144 | |
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| 145 | if ( (ret = roar_req(con, &mes, NULL)) == -1 ) |
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| 146 | return -1; |
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| 147 | |
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| 148 | if ( mes.datalen < 4 ) { |
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| 149 | memset(header+mes.datalen, 0, 4-mes.datalen); |
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| 150 | } |
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| 151 | |
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| 152 | authmes->type = header[0]; |
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| 153 | authmes->stage = header[1]; |
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| 154 | authmes->reserved.c[0] = header[2]; |
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| 155 | authmes->reserved.c[1] = header[3]; |
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| 156 | |
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| 157 | return 0; |
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| 158 | } |
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[0] | 159 | |
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[3227] | 160 | static void roar_auth_mes_init(struct roar_auth_message * authmes, int type) { |
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| 161 | memset(authmes, 0, sizeof(struct roar_auth_message)); |
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| 162 | |
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| 163 | authmes->type = type; |
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| 164 | authmes->stage = 0; |
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| 165 | authmes->data = NULL; |
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| 166 | authmes->len = 0; |
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| 167 | } |
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| 168 | |
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[3228] | 169 | #define _EOL ROAR_AUTH_T_AUTO |
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[3227] | 170 | int roar_auth (struct roar_connection * con) { |
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| 171 | struct roar_auth_message authmes; |
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| 172 | int ret; |
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[3228] | 173 | int i; |
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| 174 | int ltt[] = { |
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| 175 | ROAR_AUTH_T_TRUST, |
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| 176 | ROAR_AUTH_T_IDENT, |
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| 177 | ROAR_AUTH_T_RHOST, |
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| 178 | ROAR_AUTH_T_NONE, |
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| 179 | _EOL |
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| 180 | }; |
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[3227] | 181 | |
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[3228] | 182 | for (i = 0; ltt[i] != _EOL; i++) { |
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| 183 | roar_auth_mes_init(&authmes, ltt[i]); |
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| 184 | |
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| 185 | if ( (ret = roar_auth_ask_server(con, &authmes)) == -1 ) |
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| 186 | continue; |
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[3227] | 187 | |
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[3228] | 188 | if ( authmes.stage != 0 ) |
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| 189 | continue; |
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[3227] | 190 | |
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[3228] | 191 | return 0; |
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| 192 | } |
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| 193 | |
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| 194 | return -1; |
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[0] | 195 | } |
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| 196 | |
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[3225] | 197 | // String functions: |
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| 198 | static struct { |
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| 199 | int type; |
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| 200 | char * name; |
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| 201 | } _g_authts[] = { |
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| 202 | // 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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| 203 | {ROAR_AUTH_T_NONE, "none" }, |
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| 204 | {ROAR_AUTH_T_COOKIE, "cookie" }, |
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| 205 | {ROAR_AUTH_T_TRUST, "trust" }, |
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| 206 | {ROAR_AUTH_T_PASSWORD, "password"}, |
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| 207 | {ROAR_AUTH_T_SYSUSER, "sysuser" }, |
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| 208 | {ROAR_AUTH_T_OPENPGP_SIGN, "openpgp" }, |
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| 209 | {ROAR_AUTH_T_OPENPGP_ENCRYPT, "openpgp" }, |
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| 210 | {ROAR_AUTH_T_OPENPGP_AUTH, "openpgp" }, |
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| 211 | {ROAR_AUTH_T_KERBEROS, "kerberos"}, |
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| 212 | {ROAR_AUTH_T_RHOST, "rhost" }, |
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| 213 | {ROAR_AUTH_T_XAUTH, "xauth" }, |
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| 214 | {ROAR_AUTH_T_IDENT, "ident" }, |
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| 215 | {-1, NULL} |
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| 216 | }; |
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| 217 | |
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| 218 | int roar_str2autht(char * str) { |
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| 219 | int i; |
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| 220 | |
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| 221 | for (i = 0; _g_authts[i].name != NULL; i++) |
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| 222 | if ( !strcasecmp(_g_authts[i].name, str) ) |
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| 223 | return _g_authts[i].type; |
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| 224 | |
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| 225 | return -1; |
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| 226 | } |
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| 227 | |
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| 228 | char * roar_autht2str(int auth) { |
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| 229 | int i; |
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| 230 | |
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| 231 | for (i = 0; _g_authts[i].name != NULL; i++) |
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| 232 | if ( _g_authts[i].type == auth ) |
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| 233 | return _g_authts[i].name; |
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| 234 | |
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| 235 | return "(UNKNOWN)"; |
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| 236 | } |
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| 237 | |
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[0] | 238 | //ll |
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