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 #include "libsmooth.h"
  23 #include "setuid.h"
  24
  25 #define ERR_ANY 1
  26 #define ERR_SETTINGS 2    /* error in settings file */
  27 #define ERR_ETC 3         /* error with /etc permissions */
  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], command[STRING_SIZE], hostname[STRING_SIZE];
  34    char varmessages[STRING_SIZE], enable_asynclog[STRING_SIZE];
  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
  49    if (!readkeyvalues(kv, "/var/ipfire/logging/settings"))
  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    }
  66
  67    if (!findkey(kv, "ENABLE_ASYNCLOG", enable_asynclog))
  68    {
  69       fprintf(stderr, "Cannot read ENABLE_ASYNCLOG\n");
  70       exit(ERR_SETTINGS);
  71    }
  72
  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
  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
  91     * change the file mode to give themselves or anyone else write access. */
  92
  93    if(lstat("/etc",&st))
  94    {
  95       perror("Unable to stat /etc");
  96       exit(ERR_ETC);
  97    }
  98    if(!S_ISDIR(st.st_mode))
  99    {
 100       fprintf(stderr, "/etc is not a directory?!\n");
 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    {
 106       fprintf(stderr, "/etc is owned/writable by non-root users\n");
 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 */
 112    if ((config_fd = open( "/etc/syslog.conf.new", O_WRONLY|O_CREAT|O_EXCL, 0644 )) == -1 )
 113    {
 114       perror("Unable to open new config file");
 115       exit(ERR_CONFIG);
 116    }
 117
 118    if (!strcmp(buffer,"on"))
 119       snprintf(buffer, STRING_SIZE - 1, "/bin/sed -e 's/^#\\?\\(\\*\\.\\*[[:blank:]]\\+@\\).\\+$/\\1%s/' /etc/syslog.conf >&%d", hostname, config_fd );
 120    else
 121       snprintf(buffer, STRING_SIZE - 1, "/bin/sed -e 's/^#\\?\\(\\*\\.\\*[[:blank:]]\\+@.\\+\\)$/#\\1/' /etc/syslog.conf >&%d", config_fd );
 122
 123      /* if the return code isn't 0 failsafe */
 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);
 128       unlink("/etc/syslog.conf.new");
 129       exit(ERR_CONFIG);
 130    }
 131    close(config_fd);
 132
 133    /* Replace the logging option*/
 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");
 135
 136    if (strcmp(enable_asynclog,"on"))
 137      snprintf(command, STRING_SIZE-1, "printf '%s     -/var/log/messages' >> /etc/syslog.conf.new", varmessages );
 138    else
 139      snprintf(command, STRING_SIZE-1, "printf '%s     /var/log/messages' >> /etc/syslog.conf.new", varmessages );
 140
 141      safe_system(command);
 142
 143    if (rename("/etc/syslog.conf.new", "/etc/syslog.conf") == -1)
 144    {
 145       perror("Unable to replace old config file");
 146       unlink("/etc/syslog.conf.new");
 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 }