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5b3962de CS |
1 | /* This file is part of the IPCop Firewall. |
2 | * | |
3 | * This program is distributed under the terms of the GNU General Public | |
4 | * Licence. See the file COPYING for details. | |
5 | * | |
6 | * Copyright (C) 2003-07-12 Robert Kerr <rkerr@go.to> | |
7 | * | |
8 | * $Id$ | |
9 | * | |
10 | * Edited by the IPFire Team to change var log messages | |
11 | */ | |
12 | ||
13 | #include <stdio.h> | |
14 | #include <stdlib.h> | |
15 | #include <unistd.h> | |
16 | #include <string.h> | |
17 | #include <sys/stat.h> | |
18 | #include <sys/types.h> | |
19 | #include <fcntl.h> | |
20 | #include <signal.h> | |
21 | #include <errno.h> | |
22 | #include "libsmooth.h" | |
23 | #include "setuid.h" | |
24 | ||
25 | #define ERR_ANY 1 | |
26 | #define ERR_SETTINGS 2 /* error in settings file */ | |
d36e6241 | 27 | #define ERR_ETC 3 /* error with /etc permissions */ |
5b3962de CS |
28 | #define ERR_CONFIG 4 /* error updated sshd_config */ |
29 | #define ERR_SYSLOG 5 /* error restarting syslogd */ | |
30 | ||
31 | int main(void) | |
32 | { | |
f81179c3 | 33 | char buffer[STRING_SIZE], command[STRING_SIZE], hostname[STRING_SIZE]; |
77e9b64c | 34 | char varmessages[STRING_SIZE], asynclog[STRING_SIZE]; |
5b3962de CS |
35 | int config_fd,rc,fd,pid; |
36 | struct stat st; | |
37 | struct keyvalue *kv = NULL; | |
38 | memset(buffer, 0, STRING_SIZE); | |
39 | memset(hostname, 0, STRING_SIZE); | |
40 | memset(varmessages, 0, STRING_SIZE); | |
77e9b64c | 41 | memset(asynclog, 0, STRING_SIZE); |
5b3962de CS |
42 | |
43 | if (!(initsetuid())) | |
44 | exit(1); | |
45 | ||
46 | ||
47 | /* Read in and verify config */ | |
48 | kv=initkeyvalues(); | |
49 | ||
ca4c317c | 50 | if (!readkeyvalues(kv, "/var/ipfire/logging/settings")) |
5b3962de CS |
51 | { |
52 | fprintf(stderr, "Cannot read syslog settings\n"); | |
53 | exit(ERR_SETTINGS); | |
54 | } | |
55 | ||
56 | if (!findkey(kv, "ENABLE_REMOTELOG", buffer)) | |
57 | { | |
58 | fprintf(stderr, "Cannot read ENABLE_REMOTELOG\n"); | |
59 | exit(ERR_SETTINGS); | |
60 | } | |
61 | ||
62 | if (!findkey(kv, "REMOTELOG_ADDR", hostname)) | |
63 | { | |
64 | fprintf(stderr, "Cannot read REMOTELOG_ADDR\n"); | |
65 | exit(ERR_SETTINGS); | |
66 | } | |
f81179c3 | 67 | |
77e9b64c | 68 | if (!findkey(kv, "ENABLE_ASYNCLOG", asynclog)) |
f81179c3 AF |
69 | { |
70 | fprintf(stderr, "Cannot read ENABLE_ASYNCLOG\n"); | |
71 | exit(ERR_SETTINGS); | |
72 | } | |
73 | ||
5b3962de CS |
74 | |
75 | if (!findkey(kv, "VARMESSAGES", varmessages)) | |
76 | { | |
77 | fprintf(stderr, "Cannot read VARMESSAGES\n"); | |
78 | exit(ERR_SETTINGS); | |
79 | } | |
80 | ||
81 | if (strspn(hostname, VALID_FQDN) != strlen(hostname)) | |
82 | { | |
83 | fprintf(stderr, "Bad REMOTELOG_ADDR: %s\n", hostname); | |
84 | exit(ERR_SETTINGS); | |
85 | } | |
86 | ||
87 | freekeyvalues(kv); | |
88 | ||
89 | ||
d36e6241 CS |
90 | /* If anyone other than root can write to /etc this would be totally |
91 | * insecure - same if anyone other than root owns /etc, as they could | |
5b3962de CS |
92 | * change the file mode to give themselves or anyone else write access. */ |
93 | ||
d36e6241 | 94 | if(lstat("/etc",&st)) |
5b3962de | 95 | { |
d36e6241 | 96 | perror("Unable to stat /etc"); |
5b3962de CS |
97 | exit(ERR_ETC); |
98 | } | |
99 | if(!S_ISDIR(st.st_mode)) | |
100 | { | |
d36e6241 | 101 | fprintf(stderr, "/etc is not a directory?!\n"); |
5b3962de CS |
102 | exit(ERR_ETC); |
103 | } | |
104 | if ( st.st_uid != 0 || st.st_mode & S_IWOTH || | |
105 | ((st.st_gid != 0) && (st.st_mode & S_IWGRP)) ) | |
106 | { | |
d36e6241 | 107 | fprintf(stderr, "/etc is owned/writable by non-root users\n"); |
5b3962de CS |
108 | exit(ERR_ETC); |
109 | } | |
110 | ||
111 | /* O_CREAT with O_EXCL will make open() fail if the file already exists - | |
112 | * mostly to prevent 2 copies running at once */ | |
d36e6241 | 113 | if ((config_fd = open( "/etc/syslog.conf.new", O_WRONLY|O_CREAT|O_EXCL, 0644 )) == -1 ) |
5b3962de CS |
114 | { |
115 | perror("Unable to open new config file"); | |
116 | exit(ERR_CONFIG); | |
117 | } | |
118 | ||
119 | if (!strcmp(buffer,"on")) | |
d36e6241 | 120 | snprintf(buffer, STRING_SIZE - 1, "/bin/sed -e 's/^#\\?\\(\\*\\.\\*[[:blank:]]\\+@\\).\\+$/\\1%s/' /etc/syslog.conf >&%d", hostname, config_fd ); |
5b3962de | 121 | else |
d36e6241 | 122 | snprintf(buffer, STRING_SIZE - 1, "/bin/sed -e 's/^#\\?\\(\\*\\.\\*[[:blank:]]\\+@.\\+\\)$/#\\1/' /etc/syslog.conf >&%d", config_fd ); |
5b3962de | 123 | |
4c7fa778 | 124 | /* if the return code isn't 0 failsafe */ |
5b3962de CS |
125 | if ((rc = unpriv_system(buffer,99,99)) != 0) |
126 | { | |
127 | fprintf(stderr, "sed returned bad exit code: %d\n", rc); | |
128 | close(config_fd); | |
d36e6241 | 129 | unlink("/etc/syslog.conf.new"); |
5b3962de CS |
130 | exit(ERR_CONFIG); |
131 | } | |
132 | close(config_fd); | |
4c7fa778 MT |
133 | |
134 | /* Replace the logging option*/ | |
4c7fa778 | 135 | safe_system("grep -v '/var/log/messages' < /etc/syslog.conf.new > /etc/syslog.conf.tmp && mv /etc/syslog.conf.tmp /etc/syslog.conf.new"); |
6945083e | 136 | |
77e9b64c CS |
137 | if (!strcmp(asynclog,"on")) |
138 | snprintf(command, STRING_SIZE - 1, "printf '%s -/var/log/messages' >> /etc/syslog.conf.new", varmessages ); | |
6945083e | 139 | else |
77e9b64c | 140 | snprintf(command, STRING_SIZE - 1, "printf '%s /var/log/messages' >> /etc/syslog.conf.new", varmessages ); |
6945083e | 141 | |
4c7fa778 MT |
142 | safe_system(command); |
143 | ||
a3d6c878 | 144 | if (rename("/etc/syslog.conf.new", "/etc/syslog.conf") == -1) |
5b3962de CS |
145 | { |
146 | perror("Unable to replace old config file"); | |
d36e6241 | 147 | unlink("/etc/syslog.conf.new"); |
5b3962de CS |
148 | exit(ERR_CONFIG); |
149 | } | |
150 | ||
151 | ||
152 | /* Get syslogd to read the new config file */ | |
153 | if ((fd = open("/var/run/syslogd.pid", O_RDONLY)) == -1) | |
154 | { | |
155 | if(errno == ENOENT) | |
156 | { | |
157 | /* pid file doesn't exists.. restart syslog */ | |
158 | if((rc = safe_system("/usr/sbin/syslogd u syslogd -m 0")) == 0 ) | |
159 | return 0; | |
160 | else | |
161 | { | |
162 | fprintf(stderr, | |
163 | "Unable to restart syslogd - returned exit code %d\n", rc); | |
164 | exit(ERR_SYSLOG); | |
165 | } | |
166 | } else { | |
167 | /* Something odd is going on, failsafe */ | |
168 | perror("Unable to open pid file"); | |
169 | exit(ERR_SYSLOG); | |
170 | } | |
171 | } | |
172 | ||
173 | memset(buffer, 0, STRING_SIZE); | |
174 | if (read(fd, buffer, STRING_SIZE - 1) == -1) | |
175 | { | |
176 | close(fd); | |
177 | perror("Couldn't read from pid file"); | |
178 | exit(ERR_SYSLOG); | |
179 | } | |
180 | close(fd); | |
181 | /* strtol does sanity checks that atoi doesn't do */ | |
182 | errno = 0; | |
183 | pid = (int)strtol(buffer, (char **)NULL, 10); | |
184 | if (errno || pid <= 1) | |
185 | { | |
186 | fprintf(stderr, "Bad pid value\n"); | |
187 | exit(ERR_SYSLOG); | |
188 | } | |
189 | if (kill(pid, SIGHUP) == -1) | |
190 | { | |
191 | fprintf(stderr, "Unable to send SIGHUP\n"); | |
192 | exit(ERR_SYSLOG); | |
193 | } | |
194 | ||
195 | return 0; | |
196 | } |