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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 | { | |
33 | char buffer[STRING_SIZE], hostname[STRING_SIZE], varmessages[STRING_SIZE]; | |
34 | int config_fd,rc,fd,pid; | |
35 | struct stat st; | |
36 | struct keyvalue *kv = NULL; | |
37 | memset(buffer, 0, STRING_SIZE); | |
38 | memset(hostname, 0, STRING_SIZE); | |
39 | memset(varmessages, 0, STRING_SIZE); | |
40 | ||
41 | if (!(initsetuid())) | |
42 | exit(1); | |
43 | ||
44 | ||
45 | /* Read in and verify config */ | |
46 | kv=initkeyvalues(); | |
47 | ||
ca4c317c | 48 | if (!readkeyvalues(kv, "/var/ipfire/logging/settings")) |
5b3962de CS |
49 | { |
50 | fprintf(stderr, "Cannot read syslog settings\n"); | |
51 | exit(ERR_SETTINGS); | |
52 | } | |
53 | ||
54 | if (!findkey(kv, "ENABLE_REMOTELOG", buffer)) | |
55 | { | |
56 | fprintf(stderr, "Cannot read ENABLE_REMOTELOG\n"); | |
57 | exit(ERR_SETTINGS); | |
58 | } | |
59 | ||
60 | if (!findkey(kv, "REMOTELOG_ADDR", hostname)) | |
61 | { | |
62 | fprintf(stderr, "Cannot read REMOTELOG_ADDR\n"); | |
63 | exit(ERR_SETTINGS); | |
64 | } | |
65 | ||
66 | if (!findkey(kv, "VARMESSAGES", varmessages)) | |
67 | { | |
68 | fprintf(stderr, "Cannot read VARMESSAGES\n"); | |
69 | exit(ERR_SETTINGS); | |
70 | } | |
71 | ||
72 | if (strspn(hostname, VALID_FQDN) != strlen(hostname)) | |
73 | { | |
74 | fprintf(stderr, "Bad REMOTELOG_ADDR: %s\n", hostname); | |
75 | exit(ERR_SETTINGS); | |
76 | } | |
77 | ||
78 | freekeyvalues(kv); | |
79 | ||
80 | ||
d36e6241 CS |
81 | /* If anyone other than root can write to /etc this would be totally |
82 | * insecure - same if anyone other than root owns /etc, as they could | |
5b3962de CS |
83 | * change the file mode to give themselves or anyone else write access. */ |
84 | ||
d36e6241 | 85 | if(lstat("/etc",&st)) |
5b3962de | 86 | { |
d36e6241 | 87 | perror("Unable to stat /etc"); |
5b3962de CS |
88 | exit(ERR_ETC); |
89 | } | |
90 | if(!S_ISDIR(st.st_mode)) | |
91 | { | |
d36e6241 | 92 | fprintf(stderr, "/etc is not a directory?!\n"); |
5b3962de CS |
93 | exit(ERR_ETC); |
94 | } | |
95 | if ( st.st_uid != 0 || st.st_mode & S_IWOTH || | |
96 | ((st.st_gid != 0) && (st.st_mode & S_IWGRP)) ) | |
97 | { | |
d36e6241 | 98 | fprintf(stderr, "/etc is owned/writable by non-root users\n"); |
5b3962de CS |
99 | exit(ERR_ETC); |
100 | } | |
101 | ||
102 | /* O_CREAT with O_EXCL will make open() fail if the file already exists - | |
103 | * mostly to prevent 2 copies running at once */ | |
d36e6241 | 104 | if ((config_fd = open( "/etc/syslog.conf.new", O_WRONLY|O_CREAT|O_EXCL, 0644 )) == -1 ) |
5b3962de CS |
105 | { |
106 | perror("Unable to open new config file"); | |
107 | exit(ERR_CONFIG); | |
108 | } | |
109 | ||
110 | if (!strcmp(buffer,"on")) | |
d36e6241 | 111 | snprintf(buffer, STRING_SIZE - 1, "/bin/sed -e 's/^#\\?\\(\\*\\.\\*[[:blank:]]\\+@\\).\\+$/\\1%s/' /etc/syslog.conf >&%d", hostname, config_fd ); |
5b3962de | 112 | else |
d36e6241 | 113 | snprintf(buffer, STRING_SIZE - 1, "/bin/sed -e 's/^#\\?\\(\\*\\.\\*[[:blank:]]\\+@.\\+\\)$/#\\1/' /etc/syslog.conf >&%d", config_fd ); |
5b3962de | 114 | |
97bfe380 | 115 | snprintf(buffer, STRING_SIZE - 1, "/bin/sed 's/.*\\/var\\/log\\/messages.*/%s \\/var\\/log\\/messages/' /etc/syslog.conf >&%d", varmessages, config_fd ); |
5b3962de CS |
116 | |
117 | /* if the return code isn't 0 failsafe */ | |
118 | if ((rc = unpriv_system(buffer,99,99)) != 0) | |
119 | { | |
120 | fprintf(stderr, "sed returned bad exit code: %d\n", rc); | |
121 | close(config_fd); | |
d36e6241 | 122 | unlink("/etc/syslog.conf.new"); |
5b3962de CS |
123 | exit(ERR_CONFIG); |
124 | } | |
125 | close(config_fd); | |
a3d6c878 | 126 | if (rename("/etc/syslog.conf.new", "/etc/syslog.conf") == -1) |
5b3962de CS |
127 | { |
128 | perror("Unable to replace old config file"); | |
d36e6241 | 129 | unlink("/etc/syslog.conf.new"); |
5b3962de CS |
130 | exit(ERR_CONFIG); |
131 | } | |
132 | ||
133 | ||
134 | /* Get syslogd to read the new config file */ | |
135 | if ((fd = open("/var/run/syslogd.pid", O_RDONLY)) == -1) | |
136 | { | |
137 | if(errno == ENOENT) | |
138 | { | |
139 | /* pid file doesn't exists.. restart syslog */ | |
140 | if((rc = safe_system("/usr/sbin/syslogd u syslogd -m 0")) == 0 ) | |
141 | return 0; | |
142 | else | |
143 | { | |
144 | fprintf(stderr, | |
145 | "Unable to restart syslogd - returned exit code %d\n", rc); | |
146 | exit(ERR_SYSLOG); | |
147 | } | |
148 | } else { | |
149 | /* Something odd is going on, failsafe */ | |
150 | perror("Unable to open pid file"); | |
151 | exit(ERR_SYSLOG); | |
152 | } | |
153 | } | |
154 | ||
155 | memset(buffer, 0, STRING_SIZE); | |
156 | if (read(fd, buffer, STRING_SIZE - 1) == -1) | |
157 | { | |
158 | close(fd); | |
159 | perror("Couldn't read from pid file"); | |
160 | exit(ERR_SYSLOG); | |
161 | } | |
162 | close(fd); | |
163 | /* strtol does sanity checks that atoi doesn't do */ | |
164 | errno = 0; | |
165 | pid = (int)strtol(buffer, (char **)NULL, 10); | |
166 | if (errno || pid <= 1) | |
167 | { | |
168 | fprintf(stderr, "Bad pid value\n"); | |
169 | exit(ERR_SYSLOG); | |
170 | } | |
171 | if (kill(pid, SIGHUP) == -1) | |
172 | { | |
173 | fprintf(stderr, "Unable to send SIGHUP\n"); | |
174 | exit(ERR_SYSLOG); | |
175 | } | |
176 | ||
177 | return 0; | |
178 | } |