djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame^] | 1 | /* $OpenBSD: auth-rhosts.c,v 1.47 2016/03/07 19:02:43 djm Exp $ */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 5 | * All rights reserved |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 6 | * Rhosts authentication. This file contains code to check whether to admit |
| 7 | * the login based on rhosts authentication. This file also processes |
| 8 | * /etc/hosts.equiv. |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 9 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 10 | * As far as I am concerned, the code I have written for this software |
| 11 | * can be used freely for any purpose. Any derived versions of this |
| 12 | * software must be clearly marked as such, and if the derived work is |
| 13 | * incompatible with the protocol description in the RFC file, it must be |
| 14 | * called by a name other than "ssh" or "Secure Shell". |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 15 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 16 | |
| 17 | #include "includes.h" |
Damien Miller | f17883e | 2006-03-15 11:45:54 +1100 | [diff] [blame] | 18 | |
| 19 | #include <sys/types.h> |
| 20 | #include <sys/stat.h> |
Damien Miller | 015cd79 | 2006-03-15 11:08:02 +1100 | [diff] [blame] | 21 | |
| 22 | #ifdef HAVE_NETGROUP_H |
| 23 | # include <netgroup.h> |
| 24 | #endif |
Damien Miller | 9f2abc4 | 2006-07-10 20:53:08 +1000 | [diff] [blame] | 25 | #include <pwd.h> |
Damien Miller | a7a73ee | 2006-08-05 11:37:59 +1000 | [diff] [blame] | 26 | #include <stdio.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 27 | #include <string.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 28 | #include <stdarg.h> |
Darren Tucker | 06db584 | 2008-06-13 14:51:28 +1000 | [diff] [blame] | 29 | #include <fcntl.h> |
Darren Tucker | d9526a5 | 2008-06-14 09:01:24 +1000 | [diff] [blame] | 30 | #include <unistd.h> |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 31 | |
| 32 | #include "packet.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 33 | #include "uidswap.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 34 | #include "pathnames.h" |
| 35 | #include "log.h" |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 36 | #include "misc.h" |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame^] | 37 | #include "buffer.h" /* XXX */ |
| 38 | #include "key.h" /* XXX */ |
Damien Miller | 6d7b2cd | 1999-11-12 15:19:27 +1100 | [diff] [blame] | 39 | #include "servconf.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 40 | #include "canohost.h" |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame^] | 41 | #include "sshkey.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 42 | #include "hostfile.h" |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 43 | #include "auth.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 44 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 45 | /* import */ |
| 46 | extern ServerOptions options; |
Ben Lindstrom | bdde330 | 2002-05-15 16:19:37 +0000 | [diff] [blame] | 47 | extern int use_privsep; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 48 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 49 | /* |
| 50 | * This function processes an rhosts-style file (.rhosts, .shosts, or |
| 51 | * /etc/hosts.equiv). This returns true if authentication can be granted |
| 52 | * based on the file, and returns zero otherwise. |
| 53 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 54 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 55 | static int |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 56 | check_rhosts_file(const char *filename, const char *hostname, |
| 57 | const char *ipaddr, const char *client_user, |
| 58 | const char *server_user) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 59 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 60 | FILE *f; |
djm@openbsd.org | 5191df9 | 2014-12-23 22:42:48 +0000 | [diff] [blame] | 61 | #define RBUFLN 1024 |
| 62 | char buf[RBUFLN];/* Must not be larger than host, user, dummy below. */ |
Darren Tucker | 06db584 | 2008-06-13 14:51:28 +1000 | [diff] [blame] | 63 | int fd; |
| 64 | struct stat st; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 65 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 66 | /* Open the .rhosts file, deny if unreadable */ |
Darren Tucker | 06db584 | 2008-06-13 14:51:28 +1000 | [diff] [blame] | 67 | if ((fd = open(filename, O_RDONLY|O_NONBLOCK)) == -1) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 68 | return 0; |
Darren Tucker | 06db584 | 2008-06-13 14:51:28 +1000 | [diff] [blame] | 69 | if (fstat(fd, &st) == -1) { |
| 70 | close(fd); |
| 71 | return 0; |
| 72 | } |
| 73 | if (!S_ISREG(st.st_mode)) { |
| 74 | logit("User %s hosts file %s is not a regular file", |
| 75 | server_user, filename); |
| 76 | close(fd); |
| 77 | return 0; |
| 78 | } |
| 79 | unset_nonblock(fd); |
| 80 | if ((f = fdopen(fd, "r")) == NULL) { |
| 81 | close(fd); |
| 82 | return 0; |
| 83 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 84 | while (fgets(buf, sizeof(buf), f)) { |
djm@openbsd.org | 5191df9 | 2014-12-23 22:42:48 +0000 | [diff] [blame] | 85 | /* All three must have length >= buf to avoid overflows. */ |
| 86 | char hostbuf[RBUFLN], userbuf[RBUFLN], dummy[RBUFLN]; |
| 87 | char *host, *user, *cp; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 88 | int negated; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 89 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 90 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
| 91 | ; |
| 92 | if (*cp == '#' || *cp == '\n' || !*cp) |
| 93 | continue; |
| 94 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 95 | /* |
| 96 | * NO_PLUS is supported at least on OSF/1. We skip it (we |
| 97 | * don't ever support the plus syntax). |
| 98 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 99 | if (strncmp(cp, "NO_PLUS", 7) == 0) |
| 100 | continue; |
| 101 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 102 | /* |
| 103 | * This should be safe because each buffer is as big as the |
| 104 | * whole string, and thus cannot be overwritten. |
| 105 | */ |
Damien Miller | a982578 | 2003-05-18 20:53:10 +1000 | [diff] [blame] | 106 | switch (sscanf(buf, "%1023s %1023s %1023s", hostbuf, userbuf, |
| 107 | dummy)) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 108 | case 0: |
Ben Lindstrom | bdde330 | 2002-05-15 16:19:37 +0000 | [diff] [blame] | 109 | auth_debug_add("Found empty line in %.100s.", filename); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 110 | continue; |
| 111 | case 1: |
| 112 | /* Host name only. */ |
| 113 | strlcpy(userbuf, server_user, sizeof(userbuf)); |
| 114 | break; |
| 115 | case 2: |
| 116 | /* Got both host and user name. */ |
| 117 | break; |
| 118 | case 3: |
Ben Lindstrom | bdde330 | 2002-05-15 16:19:37 +0000 | [diff] [blame] | 119 | auth_debug_add("Found garbage in %.100s.", filename); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 120 | continue; |
| 121 | default: |
| 122 | /* Weird... */ |
| 123 | continue; |
| 124 | } |
| 125 | |
| 126 | host = hostbuf; |
| 127 | user = userbuf; |
| 128 | negated = 0; |
| 129 | |
| 130 | /* Process negated host names, or positive netgroups. */ |
| 131 | if (host[0] == '-') { |
| 132 | negated = 1; |
| 133 | host++; |
| 134 | } else if (host[0] == '+') |
| 135 | host++; |
| 136 | |
| 137 | if (user[0] == '-') { |
| 138 | negated = 1; |
| 139 | user++; |
| 140 | } else if (user[0] == '+') |
| 141 | user++; |
| 142 | |
| 143 | /* Check for empty host/user names (particularly '+'). */ |
| 144 | if (!host[0] || !user[0]) { |
| 145 | /* We come here if either was '+' or '-'. */ |
djm@openbsd.org | 5191df9 | 2014-12-23 22:42:48 +0000 | [diff] [blame] | 146 | auth_debug_add("Ignoring wild host/user names " |
| 147 | "in %.100s.", filename); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 148 | continue; |
| 149 | } |
| 150 | /* Verify that host name matches. */ |
| 151 | if (host[0] == '@') { |
| 152 | if (!innetgr(host + 1, hostname, NULL, NULL) && |
| 153 | !innetgr(host + 1, ipaddr, NULL, NULL)) |
| 154 | continue; |
djm@openbsd.org | 5191df9 | 2014-12-23 22:42:48 +0000 | [diff] [blame] | 155 | } else if (strcasecmp(host, hostname) && |
| 156 | strcmp(host, ipaddr) != 0) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 157 | continue; /* Different hostname. */ |
| 158 | |
| 159 | /* Verify that user name matches. */ |
| 160 | if (user[0] == '@') { |
| 161 | if (!innetgr(user + 1, NULL, client_user, NULL)) |
| 162 | continue; |
| 163 | } else if (strcmp(user, client_user) != 0) |
| 164 | continue; /* Different username. */ |
| 165 | |
| 166 | /* Found the user and host. */ |
| 167 | fclose(f); |
| 168 | |
| 169 | /* If the entry was negated, deny access. */ |
| 170 | if (negated) { |
Ben Lindstrom | bdde330 | 2002-05-15 16:19:37 +0000 | [diff] [blame] | 171 | auth_debug_add("Matched negative entry in %.100s.", |
Damien Miller | 0dc1bef | 2005-07-17 17:22:45 +1000 | [diff] [blame] | 172 | filename); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 173 | return 0; |
| 174 | } |
| 175 | /* Accept authentication. */ |
| 176 | return 1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 177 | } |
| 178 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 179 | /* Authentication using this file denied. */ |
| 180 | fclose(f); |
| 181 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 182 | } |
| 183 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 184 | /* |
| 185 | * Tries to authenticate the user using the .shosts or .rhosts file. Returns |
| 186 | * true if authentication succeeds. If ignore_rhosts is true, only |
| 187 | * /etc/hosts.equiv will be considered (.rhosts and .shosts are ignored). |
| 188 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 189 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 190 | int |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 191 | auth_rhosts(struct passwd *pw, const char *client_user) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 192 | { |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame^] | 193 | struct ssh *ssh = active_state; /* XXX */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 194 | const char *hostname, *ipaddr; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 195 | |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame^] | 196 | hostname = auth_get_canonical_hostname(ssh, options.use_dns); |
| 197 | ipaddr = ssh_remote_ipaddr(ssh); |
Ben Lindstrom | bdde330 | 2002-05-15 16:19:37 +0000 | [diff] [blame] | 198 | return auth_rhosts2(pw, client_user, hostname, ipaddr); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 199 | } |
| 200 | |
Ben Lindstrom | bdde330 | 2002-05-15 16:19:37 +0000 | [diff] [blame] | 201 | static int |
| 202 | auth_rhosts2_raw(struct passwd *pw, const char *client_user, const char *hostname, |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 203 | const char *ipaddr) |
| 204 | { |
| 205 | char buf[1024]; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 206 | struct stat st; |
| 207 | static const char *rhosts_files[] = {".shosts", ".rhosts", NULL}; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 208 | u_int rhosts_file_index; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 209 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 210 | debug2("auth_rhosts2: clientuser %s hostname %s ipaddr %s", |
| 211 | client_user, hostname, ipaddr); |
| 212 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 213 | /* Switch to the user's uid. */ |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 214 | temporarily_use_uid(pw); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 215 | /* |
djm@openbsd.org | 5191df9 | 2014-12-23 22:42:48 +0000 | [diff] [blame] | 216 | * Quick check: if the user has no .shosts or .rhosts files and |
| 217 | * no system hosts.equiv/shosts.equiv files exist then return |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 218 | * failure immediately without doing costly lookups from name |
| 219 | * servers. |
| 220 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 221 | for (rhosts_file_index = 0; rhosts_files[rhosts_file_index]; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 222 | rhosts_file_index++) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 223 | /* Check users .rhosts or .shosts. */ |
| 224 | snprintf(buf, sizeof buf, "%.500s/%.100s", |
| 225 | pw->pw_dir, rhosts_files[rhosts_file_index]); |
| 226 | if (stat(buf, &st) >= 0) |
| 227 | break; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 228 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 229 | /* Switch back to privileged uid. */ |
| 230 | restore_uid(); |
| 231 | |
djm@openbsd.org | 5191df9 | 2014-12-23 22:42:48 +0000 | [diff] [blame] | 232 | /* |
| 233 | * Deny if The user has no .shosts or .rhosts file and there |
| 234 | * are no system-wide files. |
| 235 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 236 | if (!rhosts_files[rhosts_file_index] && |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 237 | stat(_PATH_RHOSTS_EQUIV, &st) < 0 && |
djm@openbsd.org | 5191df9 | 2014-12-23 22:42:48 +0000 | [diff] [blame] | 238 | stat(_PATH_SSH_HOSTS_EQUIV, &st) < 0) { |
| 239 | debug3("%s: no hosts access files exist", __func__); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 240 | return 0; |
djm@openbsd.org | 5191df9 | 2014-12-23 22:42:48 +0000 | [diff] [blame] | 241 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 242 | |
djm@openbsd.org | 5191df9 | 2014-12-23 22:42:48 +0000 | [diff] [blame] | 243 | /* |
| 244 | * If not logging in as superuser, try /etc/hosts.equiv and |
| 245 | * shosts.equiv. |
| 246 | */ |
| 247 | if (pw->pw_uid == 0) |
| 248 | debug3("%s: root user, ignoring system hosts files", __func__); |
| 249 | else { |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 250 | if (check_rhosts_file(_PATH_RHOSTS_EQUIV, hostname, ipaddr, |
| 251 | client_user, pw->pw_name)) { |
djm@openbsd.org | 5191df9 | 2014-12-23 22:42:48 +0000 | [diff] [blame] | 252 | auth_debug_add("Accepted for %.100s [%.100s] by " |
| 253 | "/etc/hosts.equiv.", hostname, ipaddr); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 254 | return 1; |
| 255 | } |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 256 | if (check_rhosts_file(_PATH_SSH_HOSTS_EQUIV, hostname, ipaddr, |
| 257 | client_user, pw->pw_name)) { |
djm@openbsd.org | 5191df9 | 2014-12-23 22:42:48 +0000 | [diff] [blame] | 258 | auth_debug_add("Accepted for %.100s [%.100s] by " |
| 259 | "%.100s.", hostname, ipaddr, _PATH_SSH_HOSTS_EQUIV); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 260 | return 1; |
| 261 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 262 | } |
djm@openbsd.org | 5191df9 | 2014-12-23 22:42:48 +0000 | [diff] [blame] | 263 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 264 | /* |
| 265 | * Check that the home directory is owned by root or the user, and is |
| 266 | * not group or world writable. |
| 267 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 268 | if (stat(pw->pw_dir, &st) < 0) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 269 | logit("Rhosts authentication refused for %.100s: " |
Ben Lindstrom | bdde330 | 2002-05-15 16:19:37 +0000 | [diff] [blame] | 270 | "no home directory %.200s", pw->pw_name, pw->pw_dir); |
| 271 | auth_debug_add("Rhosts authentication refused for %.100s: " |
| 272 | "no home directory %.200s", pw->pw_name, pw->pw_dir); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 273 | return 0; |
| 274 | } |
| 275 | if (options.strict_modes && |
| 276 | ((st.st_uid != 0 && st.st_uid != pw->pw_uid) || |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 277 | (st.st_mode & 022) != 0)) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 278 | logit("Rhosts authentication refused for %.100s: " |
Ben Lindstrom | bdde330 | 2002-05-15 16:19:37 +0000 | [diff] [blame] | 279 | "bad ownership or modes for home directory.", pw->pw_name); |
| 280 | auth_debug_add("Rhosts authentication refused for %.100s: " |
| 281 | "bad ownership or modes for home directory.", pw->pw_name); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 282 | return 0; |
| 283 | } |
| 284 | /* Temporarily use the user's uid. */ |
Ben Lindstrom | 3fcf1a2 | 2001-04-08 18:26:59 +0000 | [diff] [blame] | 285 | temporarily_use_uid(pw); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 286 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 287 | /* Check all .rhosts files (currently .shosts and .rhosts). */ |
| 288 | for (rhosts_file_index = 0; rhosts_files[rhosts_file_index]; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 289 | rhosts_file_index++) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 290 | /* Check users .rhosts or .shosts. */ |
| 291 | snprintf(buf, sizeof buf, "%.500s/%.100s", |
| 292 | pw->pw_dir, rhosts_files[rhosts_file_index]); |
| 293 | if (stat(buf, &st) < 0) |
| 294 | continue; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 295 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 296 | /* |
| 297 | * Make sure that the file is either owned by the user or by |
| 298 | * root, and make sure it is not writable by anyone but the |
| 299 | * owner. This is to help avoid novices accidentally |
| 300 | * allowing access to their account by anyone. |
| 301 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 302 | if (options.strict_modes && |
| 303 | ((st.st_uid != 0 && st.st_uid != pw->pw_uid) || |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 304 | (st.st_mode & 022) != 0)) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 305 | logit("Rhosts authentication refused for %.100s: bad modes for %.200s", |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 306 | pw->pw_name, buf); |
Ben Lindstrom | bdde330 | 2002-05-15 16:19:37 +0000 | [diff] [blame] | 307 | auth_debug_add("Bad file modes for %.200s", buf); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 308 | continue; |
| 309 | } |
djm@openbsd.org | 5191df9 | 2014-12-23 22:42:48 +0000 | [diff] [blame] | 310 | /* |
| 311 | * Check if we have been configured to ignore .rhosts |
| 312 | * and .shosts files. |
| 313 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 314 | if (options.ignore_rhosts) { |
djm@openbsd.org | 5191df9 | 2014-12-23 22:42:48 +0000 | [diff] [blame] | 315 | auth_debug_add("Server has been configured to " |
| 316 | "ignore %.100s.", rhosts_files[rhosts_file_index]); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 317 | continue; |
| 318 | } |
| 319 | /* Check if authentication is permitted by the file. */ |
djm@openbsd.org | 5191df9 | 2014-12-23 22:42:48 +0000 | [diff] [blame] | 320 | if (check_rhosts_file(buf, hostname, ipaddr, |
| 321 | client_user, pw->pw_name)) { |
Ben Lindstrom | bdde330 | 2002-05-15 16:19:37 +0000 | [diff] [blame] | 322 | auth_debug_add("Accepted by %.100s.", |
| 323 | rhosts_files[rhosts_file_index]); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 324 | /* Restore the privileged uid. */ |
| 325 | restore_uid(); |
djm@openbsd.org | 5191df9 | 2014-12-23 22:42:48 +0000 | [diff] [blame] | 326 | auth_debug_add("Accepted host %s ip %s client_user " |
| 327 | "%s server_user %s", hostname, ipaddr, |
| 328 | client_user, pw->pw_name); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 329 | return 1; |
| 330 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 331 | } |
| 332 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 333 | /* Restore the privileged uid. */ |
| 334 | restore_uid(); |
| 335 | return 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 336 | } |
Ben Lindstrom | bdde330 | 2002-05-15 16:19:37 +0000 | [diff] [blame] | 337 | |
| 338 | int |
| 339 | auth_rhosts2(struct passwd *pw, const char *client_user, const char *hostname, |
| 340 | const char *ipaddr) |
| 341 | { |
Darren Tucker | cd70e1b | 2010-03-07 23:05:17 +1100 | [diff] [blame] | 342 | return auth_rhosts2_raw(pw, client_user, hostname, ipaddr); |
Ben Lindstrom | bdde330 | 2002-05-15 16:19:37 +0000 | [diff] [blame] | 343 | } |