mirror of
https://github.com/SELinuxProject/selinux
synced 2024-12-12 17:15:00 +00:00
5c0d7113de
The code did: len = strlen(string); new_string = malloc(len); strncpy(new_string, string, len - 1) Which is perfectly legal, but it pissed off coverity because 99/100 times if you do new_string = malloc(strlen(string)) you are doing it wrong (you didn't leave room for the nul). I rewrote that area to just use strdup and then to blank out the last character with a nul. It's clear what's going on and nothing looks 'tricky'. It does cost us 1 byte of heap allocation. I think we can live with that to have safer looking string handling code. Signed-off-by: Eric Paris <eparis@redhat.com>
465 lines
8.9 KiB
C
465 lines
8.9 KiB
C
/*
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* Copyright 1999-2004 Gentoo Technologies, Inc.
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* Distributed under the terms of the GNU General Public License v2
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* $Header: /home/cvsroot/gentoo-projects/hardened/policycoreutils-extra/src/sestatus.c,v 1.10 2004/03/26 19:25:52 pebenito Exp $
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* Patch provided by Steve Grubb
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <selinux/selinux.h>
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#include <selinux/get_default_type.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <libgen.h>
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#include <ctype.h>
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#define PROC_BASE "/proc"
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#define MAX_CHECK 50
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#define CONF "/etc/sestatus.conf"
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/* conf file sections */
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#define PROCS "[process]"
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#define FILES "[files]"
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/* buffer size for cmp_cmdline */
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#define BUFSIZE 255
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/* column to put the output (must be a multiple of 8) */
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static unsigned int COL = 32;
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extern char *selinux_mnt;
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int cmp_cmdline(const char *command, int pid)
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{
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char buf[BUFSIZE];
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char filename[BUFSIZE];
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memset(buf, '\0', BUFSIZE);
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/* first read the proc entry */
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sprintf(filename, "%s/%d/exe", PROC_BASE, pid);
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if (readlink(filename, buf, BUFSIZE) < 0)
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return 0;
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if (buf[BUFSIZE - 1] != '\0')
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buf[BUFSIZE - 1] = '\0';
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/* check if this is the command we're looking for. */
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if (strcmp(command, buf) == 0)
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return 1;
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else
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return 0;
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}
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int pidof(const char *command)
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{
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/* inspired by killall5.c from psmisc */
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DIR *dir;
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struct dirent *de;
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int pid, ret = -1, self = getpid();
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if (!(dir = opendir(PROC_BASE))) {
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perror(PROC_BASE);
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return -1;
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}
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while ((de = readdir(dir)) != NULL) {
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errno = 0;
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pid = (int)strtol(de->d_name, (char **)NULL, 10);
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if (errno || pid == 0 || pid == self)
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continue;
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if (cmp_cmdline(command, pid)) {
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ret = pid;
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break;
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}
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}
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closedir(dir);
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return ret;
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}
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void load_checks(char *pc[], int *npc, char *fc[], int *nfc)
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{
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FILE *fp = fopen(CONF, "r");
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char buf[255], *bufp;
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int buf_len, section = -1;
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int proclen = strlen(PROCS);
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int filelen = strlen(FILES);
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if (fp == NULL) {
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printf("\nUnable to open %s.\n", CONF);
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return;
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}
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while (!feof(fp)) {
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if (!fgets(buf, sizeof buf, fp))
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break;
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buf_len = strlen(buf);
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if (buf[buf_len - 1] == '\n')
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buf[buf_len - 1] = 0;
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bufp = buf;
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while (*bufp && isspace(*bufp)) {
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bufp++;
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buf_len--;
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}
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if (*bufp == '#')
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/* skip comments */
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continue;
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if (*bufp) {
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if (!(*bufp))
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goto out;
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if (strncmp(bufp, PROCS, proclen) == 0)
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section = 0;
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else if (strncmp(bufp, FILES, filelen) == 0)
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section = 1;
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else {
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switch (section) {
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case 0:
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if (*npc >= MAX_CHECK)
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break;
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pc[*npc] =
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(char *)malloc((buf_len) *
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sizeof(char));
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memcpy(pc[*npc], bufp, buf_len);
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(*npc)++;
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bufp = NULL;
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break;
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case 1:
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if (*nfc >= MAX_CHECK)
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break;
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fc[*nfc] =
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(char *)malloc((buf_len) *
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sizeof(char));
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memcpy(fc[*nfc], bufp, buf_len);
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(*nfc)++;
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bufp = NULL;
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break;
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default:
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/* ignore lines before a section */
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printf("Line not in a section: %s.\n",
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buf);
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break;
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}
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}
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}
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}
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out:
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fclose(fp);
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return;
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}
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void printf_tab(const char *outp)
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{
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char buf[20];
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snprintf(buf, sizeof(buf), "%%-%us", COL);
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printf(buf, outp);
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}
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int main(int argc, char **argv)
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{
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/* these vars are reused several times */
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int rc, opt, i, c;
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char *context, *root_path;
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/* files that need context checks */
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char *fc[MAX_CHECK];
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char *cterm = ttyname(0);
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int nfc = 0;
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struct stat m;
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/* processes that need context checks */
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char *pc[MAX_CHECK];
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int npc = 0;
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/* booleans */
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char **bools;
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int nbool;
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int verbose = 0;
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int show_bools = 0;
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/* policy */
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const char *pol_name, *root_dir;
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char *pol_path;
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while (1) {
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opt = getopt(argc, argv, "vb");
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if (opt == -1)
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break;
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switch (opt) {
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case 'v':
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verbose = 1;
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break;
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case 'b':
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show_bools = 1;
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break;
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default:
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/* invalid option */
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printf("\nUsage: %s [OPTION]\n\n", basename(argv[0]));
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printf(" -v Verbose check of process and file contexts.\n");
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printf(" -b Display current state of booleans.\n");
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printf("\nWithout options, show SELinux status.\n");
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return -1;
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}
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}
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printf_tab("SELinux status:");
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rc = is_selinux_enabled();
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switch (rc) {
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case 1:
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printf("enabled\n");
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break;
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case 0:
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printf("disabled\n");
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return 0;
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break;
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default:
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printf("unknown (%s)\n", strerror(errno));
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return 0;
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break;
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}
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printf_tab("SELinuxfs mount:");
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if (selinux_mnt != NULL) {
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printf("%s\n", selinux_mnt);
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} else {
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printf("not mounted\n\n");
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printf("Please mount selinuxfs for proper results.\n");
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return -1;
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}
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printf_tab("SELinux root directory:");
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root_dir = selinux_path();
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if (root_dir == NULL) {
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printf("error (%s)\n", strerror(errno));
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return -1;
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}
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/* The path has a trailing '/' so duplicate to edit */
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root_path = strdup(root_dir);
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if (!root_path) {
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printf("malloc error (%s)\n", strerror(errno));
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return -1;
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}
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/* actually blank the '/' */
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root_path[strlen(root_path) - 1] = '\0';
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printf("%s\n", root_path);
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free(root_path);
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/* Dump all the path information */
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printf_tab("Loaded policy name:");
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pol_path = strdup(selinux_policy_root());
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if (pol_path) {
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pol_name = basename(pol_path);
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puts(pol_name);
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free(pol_path);
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} else {
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printf("error (%s)\n", strerror(errno));
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}
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printf_tab("Current mode:");
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rc = security_getenforce();
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switch (rc) {
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case 1:
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printf("enforcing\n");
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break;
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case 0:
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printf("permissive\n");
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break;
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default:
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printf("unknown (%s)\n", strerror(errno));
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break;
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}
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printf_tab("Mode from config file:");
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if (selinux_getenforcemode(&rc) == 0) {
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switch (rc) {
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case 1:
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printf("enforcing\n");
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break;
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case 0:
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printf("permissive\n");
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break;
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case -1:
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printf("disabled\n");
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break;
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}
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} else {
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printf("error (%s)\n", strerror(errno));
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}
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printf_tab("Policy MLS status:");
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rc = is_selinux_mls_enabled();
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switch (rc) {
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case 0:
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printf("disabled\n");
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break;
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case 1:
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printf("enabled\n");
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break;
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default:
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printf("error (%s)\n", strerror(errno));
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break;
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}
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printf_tab("Policy deny_unknown status:");
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rc = security_deny_unknown();
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switch (rc) {
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case 0:
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printf("allowed\n");
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break;
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case 1:
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printf("denied\n");
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break;
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default:
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printf("error (%s)\n", strerror(errno));
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break;
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}
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rc = security_policyvers();
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printf_tab("Max kernel policy version:");
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if (rc < 0)
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printf("unknown (%s)\n", strerror(errno));
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else
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printf("%d\n", rc);
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if (show_bools) {
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/* show booleans */
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if (security_get_boolean_names(&bools, &nbool) >= 0) {
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printf("\nPolicy booleans:\n");
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for (i = 0; i < nbool; i++) {
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if (strlen(bools[i]) + 1 > COL)
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COL = strlen(bools[i]) + 1;
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}
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for (i = 0; i < nbool; i++) {
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printf_tab(bools[i]);
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rc = security_get_boolean_active(bools[i]);
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switch (rc) {
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case 1:
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printf("on");
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break;
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case 0:
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printf("off");
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break;
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default:
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printf("unknown (%s)", strerror(errno));
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break;
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}
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c = security_get_boolean_pending(bools[i]);
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if (c != rc)
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switch (c) {
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case 1:
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printf(" (activate pending)");
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break;
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case 0:
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printf(" (inactivate pending)");
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break;
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default:
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printf(" (pending error: %s)",
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strerror(errno));
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break;
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}
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printf("\n");
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/* free up the booleans */
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free(bools[i]);
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}
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free(bools);
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}
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}
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/* only show contexts if -v is given */
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if (!verbose)
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return 0;
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load_checks(pc, &npc, fc, &nfc);
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printf("\nProcess contexts:\n");
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printf_tab("Current context:");
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if (getcon(&context) >= 0) {
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printf("%s\n", context);
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freecon(context);
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} else
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printf("unknown (%s)\n", strerror(errno));
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printf_tab("Init context:");
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if (getpidcon(1, &context) >= 0) {
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printf("%s\n", context);
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freecon(context);
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} else
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printf("unknown (%s)\n", strerror(errno));
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for (i = 0; i < npc; i++) {
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rc = pidof(pc[i]);
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if (rc > 0) {
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if (getpidcon(rc, &context) < 0)
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continue;
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printf_tab(pc[i]);
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printf("%s\n", context);
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freecon(context);
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}
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}
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printf("\nFile contexts:\n");
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/* controlling term */
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printf_tab("Controlling terminal:");
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if (lgetfilecon(cterm, &context) >= 0) {
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printf("%s\n", context);
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freecon(context);
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} else {
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printf("unknown (%s)\n", strerror(errno));
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}
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for (i = 0; i < nfc; i++) {
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if (lgetfilecon(fc[i], &context) >= 0) {
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printf_tab(fc[i]);
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/* check if this is a symlink */
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if (lstat(fc[i], &m)) {
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printf
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("%s (could not check link status (%s)!)\n",
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context, strerror(errno));
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freecon(context);
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continue;
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}
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if (S_ISLNK(m.st_mode)) {
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/* print link target context */
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printf("%s -> ", context);
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freecon(context);
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if (getfilecon(fc[i], &context) >= 0) {
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printf("%s\n", context);
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freecon(context);
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} else {
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printf("unknown (%s)\n",
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strerror(errno));
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}
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} else {
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printf("%s\n", context);
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freecon(context);
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}
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}
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}
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return 0;
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}
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