| 1 | /* |
| 2 | * Dolda Connect - Modular multiuser Direct Connect-style client |
| 3 | * Copyright (C) 2004 Fredrik Tolf <fredrik@dolda2000.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | */ |
| 19 | |
| 20 | #include <pwd.h> |
| 21 | #include <sys/un.h> |
| 22 | #include <errno.h> |
| 23 | #include <string.h> |
| 24 | #include <wchar.h> |
| 25 | |
| 26 | #ifdef HAVE_CONFIG_H |
| 27 | #include <config.h> |
| 28 | #endif |
| 29 | #include "auth.h" |
| 30 | #include "utils.h" |
| 31 | #include "module.h" |
| 32 | #include "conf.h" |
| 33 | |
| 34 | struct unixdata { |
| 35 | char *username; |
| 36 | }; |
| 37 | |
| 38 | static int inithandle(struct authhandle *auth, char *username) |
| 39 | { |
| 40 | struct unixdata *data; |
| 41 | |
| 42 | data = smalloc(sizeof(*data)); |
| 43 | memset(data, 0, sizeof(*data)); |
| 44 | data->username = sstrdup(username); |
| 45 | auth->mechdata = data; |
| 46 | return(0); |
| 47 | } |
| 48 | |
| 49 | static void release(struct authhandle *auth) |
| 50 | { |
| 51 | struct unixdata *data; |
| 52 | |
| 53 | data = auth->mechdata; |
| 54 | free(data->username); |
| 55 | free(data); |
| 56 | } |
| 57 | |
| 58 | static int unixauth(struct authhandle *auth, struct socket *sk, char *passdata) |
| 59 | { |
| 60 | struct passwd *pwd; |
| 61 | struct unixdata *data; |
| 62 | |
| 63 | data = auth->mechdata; |
| 64 | if((pwd = getpwnam(data->username)) == NULL) |
| 65 | return(AUTH_ERR); |
| 66 | if(sk->ucred.uid == -1) { |
| 67 | errno = EOPNOTSUPP; /* Bleh */ |
| 68 | return(AUTH_ERR); |
| 69 | } |
| 70 | if(pwd->pw_uid == sk->ucred.uid) { |
| 71 | flog(LOG_INFO, "successful authentication as %s with Unix credentials (uid=%i, gid=%i)", data->username, sk->ucred.uid, sk->ucred.gid); |
| 72 | return(AUTH_SUCCESS); |
| 73 | } |
| 74 | auth->text = swcsdup(L"Unix credentials do not match supplied user name"); |
| 75 | return(AUTH_DENIED); |
| 76 | } |
| 77 | |
| 78 | static int available(struct socket *sk) |
| 79 | { |
| 80 | return((sk->family == PF_UNIX) && (sk->ucred.uid != -1)); |
| 81 | } |
| 82 | |
| 83 | static struct authmech mechdesc = { |
| 84 | .inithandle = inithandle, |
| 85 | .release = release, |
| 86 | .authenticate = unixauth, |
| 87 | .available = available, |
| 88 | .name = L"unix", |
| 89 | .enabled = 1 |
| 90 | }; |
| 91 | |
| 92 | static int init(int hup) |
| 93 | { |
| 94 | if(!hup) |
| 95 | regmech(&mechdesc); |
| 96 | return(0); |
| 97 | } |
| 98 | |
| 99 | static struct module me = { |
| 100 | .init = init, |
| 101 | .name = "auth-unix" |
| 102 | }; |
| 103 | MODULE(me) |