src/misc-progs/syslogdctrl.c

   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
  23 #include "libsmooth.h"
  24 #include "setuid.h"
  25 #include "netutil.h"
  26
  27 #define ERR_ANY 1
  28 #define ERR_SETTINGS 2    /* error in settings file */
  29 #define ERR_ETC 3         /* error with /etc permissions */
  30 #define ERR_CONFIG 4      /* error updated sshd_config */
  31 #define ERR_SYSLOG 5      /* error restarting syslogd */
  32
  33 int main(void)
  34 {
  35    char buffer[STRING_SIZE], command[STRING_SIZE], hostname[STRING_SIZE];
  36    char varmessages[STRING_SIZE], asynclog[STRING_SIZE];
  37    int config_fd,rc,fd,pid;
  38    struct stat st;
  39    struct keyvalue *kv = NULL;
  40    memset(buffer, 0, STRING_SIZE);
  41    memset(hostname, 0, STRING_SIZE);
  42    memset(varmessages, 0, STRING_SIZE);
  43    memset(asynclog, 0, STRING_SIZE);
  44
  45    if (!(initsetuid()))
  46       exit(1);
  47
  48
  49    /* Read in and verify config */
  50    kv=initkeyvalues();
  51
  52    if (!readkeyvalues(kv, "/var/ipfire/logging/settings"))
  53    {
  54       fprintf(stderr, "Cannot read syslog settings\n");
  55       exit(ERR_SETTINGS);
  56    }
  57
  58    if (!findkey(kv, "ENABLE_REMOTELOG", buffer))
  59    {
  60       fprintf(stderr, "Cannot read ENABLE_REMOTELOG\n");
  61       exit(ERR_SETTINGS);
  62    }
  63
  64    if (!findkey(kv, "REMOTELOG_ADDR", hostname))
  65    {
  66       fprintf(stderr, "Cannot read REMOTELOG_ADDR\n");
  67       exit(ERR_SETTINGS);
  68    }
  69
  70    if (!findkey(kv, "ENABLE_ASYNCLOG", asynclog))
  71    {
  72       fprintf(stderr, "Cannot read ENABLE_ASYNCLOG\n");
  73       exit(ERR_SETTINGS);
  74    }
  75
  76
  77    if (!findkey(kv, "VARMESSAGES", varmessages))
  78    {
  79       fprintf(stderr, "Cannot read VARMESSAGES\n");
  80       exit(ERR_SETTINGS);
  81    }
  82
  83    if (strspn(hostname, VALID_FQDN) != strlen(hostname))
  84    {
  85       fprintf(stderr, "Bad REMOTELOG_ADDR: %s\n", hostname);
  86       exit(ERR_SETTINGS);
  87    }
  88
  89    freekeyvalues(kv);
  90
  91
  92    /* If anyone other than root can write to /etc this would be totally
  93     * insecure - same if anyone other than root owns /etc, as they could
  94     * change the file mode to give themselves or anyone else write access. */
  95
  96    if(lstat("/etc",&st))
  97    {
  98       perror("Unable to stat /etc");
  99       exit(ERR_ETC);
 100    }
 101    if(!S_ISDIR(st.st_mode))
 102    {
 103       fprintf(stderr, "/etc is not a directory?!\n");
 104       exit(ERR_ETC);
 105    }
 106    if ( st.st_uid != 0  ||  st.st_mode & S_IWOTH ||
 107       ((st.st_gid != 0) && (st.st_mode & S_IWGRP)) )
 108    {
 109       fprintf(stderr, "/etc is owned/writable by non-root users\n");
 110       exit(ERR_ETC);
 111    }
 112
 113    /* O_CREAT with O_EXCL will make open() fail if the file already exists -
 114     * mostly to prevent 2 copies running at once */
 115    if ((config_fd = open( "/etc/syslog.conf.new", O_WRONLY|O_CREAT|O_EXCL, 0644 )) == -1 )
 116    {
 117       perror("Unable to open new config file");
 118       exit(ERR_CONFIG);
 119    }
 120
 121    if (!strcmp(buffer,"on"))
 122       snprintf(buffer, STRING_SIZE - 1, "/bin/sed -e 's/^#\\?\\(\\*\\.\\*[[:blank:]]\\+@\\).\\+$/\\1%s/' /etc/syslog.conf >&%d", hostname, config_fd );
 123    else
 124       snprintf(buffer, STRING_SIZE - 1, "/bin/sed -e 's/^#\\?\\(\\*\\.\\*[[:blank:]]\\+@.\\+\\)$/#\\1/' /etc/syslog.conf >&%d", config_fd );
 125
 126      /* if the return code isn't 0 failsafe */
 127    if ((rc = unpriv_system(buffer,99,99)) != 0)
 128    {
 129       fprintf(stderr, "sed returned bad exit code: %d\n", rc);
 130       close(config_fd);
 131       unlink("/etc/syslog.conf.new");
 132       exit(ERR_CONFIG);
 133    }
 134    close(config_fd);
 135
 136    /* Replace the logging option*/
 137      safe_system("grep -v '/var/log/messages' < /etc/syslog.conf.new > /etc/syslog.conf.tmp && mv /etc/syslog.conf.tmp /etc/syslog.conf.new");
 138
 139    if (!strcmp(asynclog,"on"))
 140      snprintf(command, STRING_SIZE - 1, "printf '%s     -/var/log/messages' >> /etc/syslog.conf.new", varmessages );
 141    else
 142      snprintf(command, STRING_SIZE - 1, "printf '%s     /var/log/messages' >> /etc/syslog.conf.new", varmessages );
 143
 144      safe_system(command);
 145
 146    if (rename("/etc/syslog.conf.new", "/etc/syslog.conf") == -1)
 147    {
 148       perror("Unable to replace old config file");
 149       unlink("/etc/syslog.conf.new");
 150       exit(ERR_CONFIG);
 151    }
 152
 153
 154    /* Get syslogd to read the new config file */
 155    if ((fd = open("/var/run/syslogd.pid", O_RDONLY)) == -1)
 156    {
 157       if(errno == ENOENT)
 158       {
 159          /* pid file doesn't exists.. restart syslog */
 160          if((rc = safe_system("/usr/sbin/syslogd u syslogd -m 0")) == 0 )
 161             return 0;
 162          else
 163          {
 164             fprintf(stderr,
 165                "Unable to restart syslogd - returned exit code %d\n", rc);
 166             exit(ERR_SYSLOG);
 167          }
 168       } else {
 169          /* Something odd is going on, failsafe */
 170          perror("Unable to open pid file");
 171          exit(ERR_SYSLOG);
 172       }
 173    }
 174
 175    memset(buffer, 0, STRING_SIZE);
 176    if (read(fd, buffer, STRING_SIZE - 1) == -1)
 177    {
 178       close(fd);
 179       perror("Couldn't read from pid file");
 180       exit(ERR_SYSLOG);
 181    }
 182    close(fd);
 183    /* strtol does sanity checks that atoi doesn't do */
 184    errno = 0;
 185    pid = (int)strtol(buffer, (char **)NULL, 10);
 186    if (errno || pid <= 1)
 187    {
 188       fprintf(stderr, "Bad pid value\n");
 189       exit(ERR_SYSLOG);
 190    }
 191    if (kill(pid, SIGHUP) == -1)
 192    {
 193       fprintf(stderr, "Unable to send SIGHUP\n");
 194       exit(ERR_SYSLOG);
 195    }
 196
 197    return 0;
 198 }