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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 AF |
33 | char buffer[STRING_SIZE], command[STRING_SIZE], hostname[STRING_SIZE]; |
34 | char varmessages[STRING_SIZE], enable_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); | |
41 | ||
42 | if (!(initsetuid())) | |
43 | exit(1); | |
44 | ||
45 | ||
46 | /* Read in and verify config */ | |
47 | kv=initkeyvalues(); | |
48 | ||
ca4c317c | 49 | if (!readkeyvalues(kv, "/var/ipfire/logging/settings")) |
5b3962de CS |
50 | { |
51 | fprintf(stderr, "Cannot read syslog settings\n"); | |
52 | exit(ERR_SETTINGS); | |
53 | } | |
54 | ||
55 | if (!findkey(kv, "ENABLE_REMOTELOG", buffer)) | |
56 | { | |
57 | fprintf(stderr, "Cannot read ENABLE_REMOTELOG\n"); | |
58 | exit(ERR_SETTINGS); | |
59 | } | |
60 | ||
61 | if (!findkey(kv, "REMOTELOG_ADDR", hostname)) | |
62 | { | |
63 | fprintf(stderr, "Cannot read REMOTELOG_ADDR\n"); | |
64 | exit(ERR_SETTINGS); | |
65 | } | |
f81179c3 AF |
66 | |
67 | if (!findkey(kv, "ENABLE_ASYNCLOG", enable_asynclog)) | |
68 | { | |
69 | fprintf(stderr, "Cannot read ENABLE_ASYNCLOG\n"); | |
70 | exit(ERR_SETTINGS); | |
71 | } | |
72 | ||
5b3962de CS |
73 | |
74 | if (!findkey(kv, "VARMESSAGES", varmessages)) | |
75 | { | |
76 | fprintf(stderr, "Cannot read VARMESSAGES\n"); | |
77 | exit(ERR_SETTINGS); | |
78 | } | |
79 | ||
80 | if (strspn(hostname, VALID_FQDN) != strlen(hostname)) | |
81 | { | |
82 | fprintf(stderr, "Bad REMOTELOG_ADDR: %s\n", hostname); | |
83 | exit(ERR_SETTINGS); | |
84 | } | |
85 | ||
86 | freekeyvalues(kv); | |
87 | ||
88 | ||
d36e6241 CS |
89 | /* If anyone other than root can write to /etc this would be totally |
90 | * insecure - same if anyone other than root owns /etc, as they could | |
5b3962de CS |
91 | * change the file mode to give themselves or anyone else write access. */ |
92 | ||
d36e6241 | 93 | if(lstat("/etc",&st)) |
5b3962de | 94 | { |
d36e6241 | 95 | perror("Unable to stat /etc"); |
5b3962de CS |
96 | exit(ERR_ETC); |
97 | } | |
98 | if(!S_ISDIR(st.st_mode)) | |
99 | { | |
d36e6241 | 100 | fprintf(stderr, "/etc is not a directory?!\n"); |
5b3962de CS |
101 | exit(ERR_ETC); |
102 | } | |
103 | if ( st.st_uid != 0 || st.st_mode & S_IWOTH || | |
104 | ((st.st_gid != 0) && (st.st_mode & S_IWGRP)) ) | |
105 | { | |
d36e6241 | 106 | fprintf(stderr, "/etc is owned/writable by non-root users\n"); |
5b3962de CS |
107 | exit(ERR_ETC); |
108 | } | |
109 | ||
110 | /* O_CREAT with O_EXCL will make open() fail if the file already exists - | |
111 | * mostly to prevent 2 copies running at once */ | |
d36e6241 | 112 | if ((config_fd = open( "/etc/syslog.conf.new", O_WRONLY|O_CREAT|O_EXCL, 0644 )) == -1 ) |
5b3962de CS |
113 | { |
114 | perror("Unable to open new config file"); | |
115 | exit(ERR_CONFIG); | |
116 | } | |
117 | ||
118 | if (!strcmp(buffer,"on")) | |
d36e6241 | 119 | snprintf(buffer, STRING_SIZE - 1, "/bin/sed -e 's/^#\\?\\(\\*\\.\\*[[:blank:]]\\+@\\).\\+$/\\1%s/' /etc/syslog.conf >&%d", hostname, config_fd ); |
5b3962de | 120 | else |
d36e6241 | 121 | snprintf(buffer, STRING_SIZE - 1, "/bin/sed -e 's/^#\\?\\(\\*\\.\\*[[:blank:]]\\+@.\\+\\)$/#\\1/' /etc/syslog.conf >&%d", config_fd ); |
5b3962de | 122 | |
4c7fa778 | 123 | /* if the return code isn't 0 failsafe */ |
5b3962de CS |
124 | if ((rc = unpriv_system(buffer,99,99)) != 0) |
125 | { | |
126 | fprintf(stderr, "sed returned bad exit code: %d\n", rc); | |
127 | close(config_fd); | |
d36e6241 | 128 | unlink("/etc/syslog.conf.new"); |
5b3962de CS |
129 | exit(ERR_CONFIG); |
130 | } | |
131 | close(config_fd); | |
4c7fa778 MT |
132 | |
133 | /* Replace the logging option*/ | |
4c7fa778 | 134 | 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 | 135 | |
f81179c3 | 136 | if (strcmp(enable_asynclog,"on")) |
6945083e CS |
137 | snprintf(command, STRING_SIZE-1, "printf '%s -/var/log/messages' >> /etc/syslog.conf.new", varmessages ); |
138 | else | |
4c7fa778 | 139 | snprintf(command, STRING_SIZE-1, "printf '%s /var/log/messages' >> /etc/syslog.conf.new", varmessages ); |
6945083e | 140 | |
4c7fa778 MT |
141 | safe_system(command); |
142 | ||
a3d6c878 | 143 | if (rename("/etc/syslog.conf.new", "/etc/syslog.conf") == -1) |
5b3962de CS |
144 | { |
145 | perror("Unable to replace old config file"); | |
d36e6241 | 146 | unlink("/etc/syslog.conf.new"); |
5b3962de CS |
147 | exit(ERR_CONFIG); |
148 | } | |
149 | ||
150 | ||
151 | /* Get syslogd to read the new config file */ | |
152 | if ((fd = open("/var/run/syslogd.pid", O_RDONLY)) == -1) | |
153 | { | |
154 | if(errno == ENOENT) | |
155 | { | |
156 | /* pid file doesn't exists.. restart syslog */ | |
157 | if((rc = safe_system("/usr/sbin/syslogd u syslogd -m 0")) == 0 ) | |
158 | return 0; | |
159 | else | |
160 | { | |
161 | fprintf(stderr, | |
162 | "Unable to restart syslogd - returned exit code %d\n", rc); | |
163 | exit(ERR_SYSLOG); | |
164 | } | |
165 | } else { | |
166 | /* Something odd is going on, failsafe */ | |
167 | perror("Unable to open pid file"); | |
168 | exit(ERR_SYSLOG); | |
169 | } | |
170 | } | |
171 | ||
172 | memset(buffer, 0, STRING_SIZE); | |
173 | if (read(fd, buffer, STRING_SIZE - 1) == -1) | |
174 | { | |
175 | close(fd); | |
176 | perror("Couldn't read from pid file"); | |
177 | exit(ERR_SYSLOG); | |
178 | } | |
179 | close(fd); | |
180 | /* strtol does sanity checks that atoi doesn't do */ | |
181 | errno = 0; | |
182 | pid = (int)strtol(buffer, (char **)NULL, 10); | |
183 | if (errno || pid <= 1) | |
184 | { | |
185 | fprintf(stderr, "Bad pid value\n"); | |
186 | exit(ERR_SYSLOG); | |
187 | } | |
188 | if (kill(pid, SIGHUP) == -1) | |
189 | { | |
190 | fprintf(stderr, "Unable to send SIGHUP\n"); | |
191 | exit(ERR_SYSLOG); | |
192 | } | |
193 | ||
194 | return 0; | |
195 | } |