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7368a6c8 | 1 | /* |
2 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
3 | * All rights reserved | |
bcbf86ec | 4 | * |
5 | * As far as I am concerned, the code I have written for this software | |
6 | * can be used freely for any purpose. Any derived versions of this | |
7 | * software must be clearly marked as such, and if the derived work is | |
8 | * incompatible with the protocol description in the RFC file, it must be | |
9 | * called by a name other than "ssh" or "Secure Shell". | |
10 | * | |
11 | * | |
e78a59f5 | 12 | * Copyright (c) 2000 Markus Friedl. All rights reserved. |
bcbf86ec | 13 | * |
14 | * Redistribution and use in source and binary forms, with or without | |
15 | * modification, are permitted provided that the following conditions | |
16 | * are met: | |
17 | * 1. Redistributions of source code must retain the above copyright | |
18 | * notice, this list of conditions and the following disclaimer. | |
19 | * 2. Redistributions in binary form must reproduce the above copyright | |
20 | * notice, this list of conditions and the following disclaimer in the | |
21 | * documentation and/or other materials provided with the distribution. | |
22 | * | |
23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
24 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
25 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
26 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
27 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
28 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
29 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
30 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
31 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
32 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
7368a6c8 | 33 | */ |
34 | ||
35 | #include "includes.h" | |
bcbf86ec | 36 | RCSID("$OpenBSD: auth.c,v 1.10 2000/09/07 21:13:36 markus Exp $"); |
7368a6c8 | 37 | |
38 | #include "xmalloc.h" | |
39 | #include "rsa.h" | |
40 | #include "ssh.h" | |
41 | #include "pty.h" | |
42 | #include "packet.h" | |
43 | #include "buffer.h" | |
44 | #include "cipher.h" | |
45 | #include "mpaux.h" | |
46 | #include "servconf.h" | |
e78a59f5 | 47 | #include "compat.h" |
7368a6c8 | 48 | #include "channels.h" |
49 | #include "match.h" | |
c1ef8333 | 50 | #ifdef HAVE_LOGIN_H |
51 | #include <login.h> | |
52 | #endif | |
4cb5ffa0 | 53 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) |
54 | #include <shadow.h> | |
55 | #endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */ | |
7368a6c8 | 56 | |
e78a59f5 | 57 | #include "bufaux.h" |
58 | #include "ssh2.h" | |
59 | #include "auth.h" | |
7368a6c8 | 60 | #include "session.h" |
e78a59f5 | 61 | |
7368a6c8 | 62 | /* import */ |
63 | extern ServerOptions options; | |
7368a6c8 | 64 | |
65 | /* | |
66 | * Check if the user is allowed to log in via ssh. If user is listed in | |
67 | * DenyUsers or user's primary group is listed in DenyGroups, false will | |
68 | * be returned. If AllowUsers isn't empty and user isn't listed there, or | |
69 | * if AllowGroups isn't empty and user isn't listed there, false will be | |
6ae2364d | 70 | * returned. |
7368a6c8 | 71 | * If the user's shell is not executable, false will be returned. |
6ae2364d | 72 | * Otherwise true is returned. |
7368a6c8 | 73 | */ |
a306f2dd | 74 | int |
7368a6c8 | 75 | allowed_user(struct passwd * pw) |
76 | { | |
77 | struct stat st; | |
78 | struct group *grp; | |
301e9b01 | 79 | char *shell; |
7368a6c8 | 80 | int i; |
81 | #ifdef WITH_AIXAUTHENTICATE | |
82 | char *loginmsg; | |
83 | #endif /* WITH_AIXAUTHENTICATE */ | |
4cb5ffa0 | 84 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) && \ |
85 | defined(HAS_SHADOW_EXPIRE) | |
86 | struct spwd *spw; | |
7368a6c8 | 87 | |
88 | /* Shouldn't be called if pw is NULL, but better safe than sorry... */ | |
89 | if (!pw) | |
90 | return 0; | |
91 | ||
4cb5ffa0 | 92 | spw = getspnam(pw->pw_name); |
27494968 | 93 | if (spw != NULL) { |
94 | int days = time(NULL) / 86400; | |
4cb5ffa0 | 95 | |
27494968 | 96 | /* Check account expiry */ |
97 | if ((spw->sp_expire > 0) && (days > spw->sp_expire)) | |
98 | return 0; | |
99 | ||
100 | /* Check password expiry */ | |
7f8f5e00 | 101 | if ((spw->sp_lstchg > 0) && (spw->sp_max > 0) && |
102 | (days > (spw->sp_lstchg + spw->sp_max))) | |
27494968 | 103 | return 0; |
104 | } | |
4cb5ffa0 | 105 | #else |
106 | /* Shouldn't be called if pw is NULL, but better safe than sorry... */ | |
107 | if (!pw) | |
108 | return 0; | |
109 | #endif | |
110 | ||
301e9b01 | 111 | /* |
112 | * Get the shell from the password data. An empty shell field is | |
113 | * legal, and means /bin/sh. | |
114 | */ | |
115 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; | |
116 | ||
117 | /* deny if shell does not exists or is not executable */ | |
118 | if (stat(shell, &st) != 0) | |
7368a6c8 | 119 | return 0; |
120 | if (!((st.st_mode & S_IFREG) && (st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP)))) | |
121 | return 0; | |
122 | ||
123 | /* Return false if user is listed in DenyUsers */ | |
124 | if (options.num_deny_users > 0) { | |
125 | if (!pw->pw_name) | |
126 | return 0; | |
127 | for (i = 0; i < options.num_deny_users; i++) | |
128 | if (match_pattern(pw->pw_name, options.deny_users[i])) | |
129 | return 0; | |
130 | } | |
131 | /* Return false if AllowUsers isn't empty and user isn't listed there */ | |
132 | if (options.num_allow_users > 0) { | |
133 | if (!pw->pw_name) | |
134 | return 0; | |
135 | for (i = 0; i < options.num_allow_users; i++) | |
136 | if (match_pattern(pw->pw_name, options.allow_users[i])) | |
137 | break; | |
138 | /* i < options.num_allow_users iff we break for loop */ | |
139 | if (i >= options.num_allow_users) | |
140 | return 0; | |
141 | } | |
142 | /* Get the primary group name if we need it. Return false if it fails */ | |
143 | if (options.num_deny_groups > 0 || options.num_allow_groups > 0) { | |
144 | grp = getgrgid(pw->pw_gid); | |
145 | if (!grp) | |
146 | return 0; | |
147 | ||
148 | /* Return false if user's group is listed in DenyGroups */ | |
149 | if (options.num_deny_groups > 0) { | |
150 | if (!grp->gr_name) | |
151 | return 0; | |
152 | for (i = 0; i < options.num_deny_groups; i++) | |
153 | if (match_pattern(grp->gr_name, options.deny_groups[i])) | |
154 | return 0; | |
155 | } | |
156 | /* | |
157 | * Return false if AllowGroups isn't empty and user's group | |
158 | * isn't listed there | |
159 | */ | |
160 | if (options.num_allow_groups > 0) { | |
161 | if (!grp->gr_name) | |
162 | return 0; | |
163 | for (i = 0; i < options.num_allow_groups; i++) | |
164 | if (match_pattern(grp->gr_name, options.allow_groups[i])) | |
165 | break; | |
166 | /* i < options.num_allow_groups iff we break for | |
167 | loop */ | |
168 | if (i >= options.num_allow_groups) | |
169 | return 0; | |
170 | } | |
171 | } | |
172 | ||
173 | #ifdef WITH_AIXAUTHENTICATE | |
5daf7064 | 174 | if (loginrestrictions(pw->pw_name, S_RLOGIN, NULL, &loginmsg) != 0) { |
c1ef8333 | 175 | if (loginmsg && *loginmsg) { |
176 | /* Remove embedded newlines (if any) */ | |
177 | char *p; | |
5daf7064 | 178 | for (p = loginmsg; *p; p++) { |
c1ef8333 | 179 | if (*p == '\n') |
180 | *p = ' '; | |
5daf7064 | 181 | } |
c1ef8333 | 182 | /* Remove trailing newline */ |
183 | *--p = '\0'; | |
5daf7064 | 184 | log("Login restricted for %s: %.100s", pw->pw_name, loginmsg); |
c1ef8333 | 185 | } |
7368a6c8 | 186 | return 0; |
c1ef8333 | 187 | } |
7368a6c8 | 188 | #endif /* WITH_AIXAUTHENTICATE */ |
189 | ||
190 | /* We found no reason not to let this user try to log on... */ | |
191 | return 1; | |
192 | } |