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eachfile.c
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eachfile.c
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/*
integrit - file integrity verification system
Copyright (C) 2006 Ed L. Cashin
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <dirent.h>
#include <time.h>
#include <utime.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <unistd.h>
#include <errno.h>
/* support platforms that don't yet conform to C99 */
#if HAVE_STDINT_H
#include <stdint.h>
#elif HAVE_INTTYPES_H
#include <inttypes.h>
#else
#error No stdint.h or inttypes.h found.
#endif
#include "digest.h"
#include "cdb.h"
#include "cdb_make.h"
#include "cdb_get.h"
#include "cdb_put.h"
#include "hashtbl.h"
#include "elcerror.h"
#include "xstrdup.h"
#include "xstradd.h"
#include "integrit.h"
#include "rules.h"
#include "checkset.h"
#include "elcwft.h"
#include "eachfile.h"
#include "xml.h"
#include "elcerror_p.h"
#include "rules_p.h"
#include "hexprint_p.h"
#include "eachfile_p.h"
#include "xml_p.h"
#include "dbinfo.h"
#include "show.h"
#ifdef ELC_FIND_LEAKS
#include "leakfind.h"
#endif
#define ALGO_NAME "checksum"
#define ELC_TIMEBUFSIZ 16
typedef struct fileinfo { /* database file information */
dbinfo dbinf;
char *path; /* null-terminated */
size_t pathlen; /* save on strlen calls,
* since we know it already */
unsigned long ruleset;
unsigned found_ruleset: 1; /* flag indicates whether ruleset
* member has been initialized */
unsigned did_sum: 1; /* flag shows whether sum member
* contains a valid checksum */
} fileinfo;
static void fileinfo_init(fileinfo *inf, char *path, size_t pathlen)
{
inf->ruleset = 0;
inf->found_ruleset = 0;
inf->did_sum = 0;
inf->path = path;
inf->pathlen = pathlen;
}
static unsigned long fileinfo_ruleset(integrit_t *it, fileinfo *inf)
{
if (! inf->found_ruleset) {
inf->ruleset = rules_for_path(it, inf->path);
inf->found_ruleset = 1;
}
return inf->ruleset;
}
/* There's a race condition between lstat and open in the following
* sequence:
*
* lstat "foo"
* if is regular file, open and read
*
* ... so we do an extra (cheap, says Andrew Gierth) stat using fstat
* on the file descriptor returned by open. Then we can avoid accidentally
* following symlinks or reading from fifos, sockets, etc., that have
* become file "foo" (e.g. with "mv mysock foo") since we did lstat.
*
* Thanks to lumpy <lumpy@9mm.com> for pointing out the race condition.
*
*/
inline static int do_checksum(integrit_t *it, fileinfo *inf)
{
DIGEST_CONTEXT context;
char buf[BUFSIZ];
int n;
struct stat fd_sb; /* file-descriptor-based stat buffer */
int fd;
dbinfo *dbinf = &inf->dbinf;
struct utimbuf utb; /* for resetting access time */
digest_init(&context);
/*
* For a symlink, read the name in the symlink as if it were "contents".
* Note that we can't make this check on the open fd's stat buffer,
* because fstat() works on the underlying file, not the symlink.
*/
if (S_ISLNK(inf->dbinf.stat.st_mode)) {
int ret;
ret = readlink(inf->path, buf, BUFSIZ);
if (ret < 0) {
warn(__FUNCTION__, "Warning: could not readlink symlink (%s): %s",
inf->path, strerror(errno));
return 0;
}
digest_write(&context, (uint8_t*) buf, ret);
} else {
if ( (fd = open(inf->path, O_RDONLY)) == -1) {
warn(__FUNCTION__, "Warning: could not open file (%s) for reading: %s",
inf->path, strerror(errno));
return 0; /* didn't do checksum */
}
if (fstat(fd, &fd_sb) == -1)
die(__FUNCTION__, "Error: could not fstat file (%s): %s",
inf->path, strerror(errno));
/* check that the file we've opened is the same one we did lstat on */
if (fd_sb.st_ino != inf->dbinf.stat.st_ino) {
warn(__FUNCTION__, "Warning: file (%s) changed before we opened it",
inf->path);
return 0; /* didn't do checksum */
}
/* if read fails, n gets -1 */
while ( (n = read(fd, buf, BUFSIZ)) > 0)
digest_write(&context, (uint8_t*) buf, n);
if (n == -1) /* read error */
warn(__FUNCTION__, "Warning: read from file (%s) failed: %s",
inf->path, strerror(errno));
close(fd);
}
digest_final(&context);
memcpy(dbinf->sum, digest_read(&context), DIGEST_LENGTH);
/* reset access time on request */
if (fileinfo_ruleset(it, inf) & RULE_RESET_ATIME) {
#ifdef DEBUG
fprintf(stderr, "debug (%s): resetting atime for file (%s)\n",
__FUNCTION__, inf->path);
#endif
utb.actime = dbinf->stat.st_atime;
utb.modtime = dbinf->stat.st_mtime;
if (utime(inf->path, &utb) == -1)
warn(__FUNCTION__,
"Warning: resetting access time for file (%s): %s",
inf->path, strerror(errno));
}
return 1; /* did do checksum */
}
static void show_diff_xml_long(FILE *out, char T, const char *type,
long old, long new)
{
xml_start_print(out, type);
XML_START_PRINT(out, "old");
fprintf(out, "%ld", old);
XML_END_PRINT(out, "old");
XML_START_PRINT(out, "new");
fprintf(out, "%ld", new);
XML_END_PRINT(out, "new");
xml_end_print(out, type);
}
static void show_diff_long(FILE *out, char T, const char *type,
long old, long new)
{
fprintf(out, "%c(%ld:%ld) ", T, old, new);
}
static void show_diff_time(FILE *out, char T, const char *type,
time_t old, time_t new)
{
char buf[ELC_TIMEBUFSIZ];
putc(T, out);
putc('(', out);
if (! strftime(buf, ELC_TIMEBUFSIZ, "%Y%m%d-%H%M%S", localtime(&old)) )
DIE("strftime");
fputs(buf, out);
putc(':', out);
if (! strftime(buf, ELC_TIMEBUFSIZ, "%Y%m%d-%H%M%S", localtime(&new)) )
DIE("strftime");
fputs(buf, out);
fputs(") ", out);
}
static void show_diff_xml_octal(FILE *out, char T, const char *type,
unsigned long old, unsigned long new)
{
xml_start_print(out, type);
XML_START_PRINT(out, "old");
fprintf(out, "0%lo", old);
XML_END_PRINT(out, "old");
XML_START_PRINT(out, "new");
fprintf(out, "0%lo", new);
XML_END_PRINT(out, "new");
xml_end_print(out, type);
}
static void show_diff_octal(FILE *out, char T, const char *type,
unsigned long old, unsigned long new)
{
fprintf(out, "%c(0%lo:0%lo) ", T, old, new);
}
static void show_diff_perms(FILE *out, mode_t old, mode_t new)
{
fputs("p(", out);
fprintf(out, "0%o", (unsigned int) old);
putc(':', out);
fprintf(out, "0%o) ", (unsigned int) new);
}
static void show_diff_type(FILE *out, mode_t old, mode_t new)
{
fputs("t(", out);
fprintf(out, "%o", (unsigned int) old);
putc(':', out);
fprintf(out, "%o) ", (unsigned int) new);
}
static void show_diffs(integrit_t *it,
const char *path, unsigned long diffs,
const struct stat *sa, const struct stat *sb)
{
/* these function pointers use "sho" for "show" to avoid confusion
* with functions from show.c */
void (*sho_long)(FILE *out, char T, const char *type, long old, long new);
void (*sho_time)(FILE *out, char T, const char *type,
time_t old, time_t new);
void (*sho_oct)(FILE *out, char T, const char *type,
unsigned long old, unsigned long new);
if (it->output == OUTPUT_XML) {
sho_long = show_diff_xml_long;
/* this cast surpresses warnings on some systems */
sho_time
= (void (*)(FILE *, char, const char *, time_t, time_t)) show_diff_xml_long;
sho_oct = show_diff_xml_octal;
XML_CHANGE_START_PRINT(stdout, "stat", path);
} else {
sho_long = show_diff_long;
sho_time = show_diff_time;
sho_oct = show_diff_octal;
fprintf(stdout, "changed: %s ", path);
}
if (diffs & RULE_INODE)
sho_long(stdout, 'i', "inode", sa->st_ino, sb->st_ino);
if (diffs & RULE_PERMS) {
if (it->output == OUTPUT_XML) {
sho_oct(stdout, 'p', "permissions",
sa->st_mode & PERM_MASK, sb->st_mode & PERM_MASK);
} else {
show_diff_perms(stdout,
sa->st_mode & PERM_MASK, sb->st_mode & PERM_MASK);
}
}
if (diffs & RULE_TYPE) {
if (it->output == OUTPUT_XML) {
sho_oct(stdout, 't', "type",
sa->st_mode & S_IFMT, sb->st_mode & S_IFMT);
} else {
show_diff_type(stdout,
sa->st_mode & S_IFMT, sb->st_mode & S_IFMT);
}
}
if (diffs & RULE_DEVICETYPE) {
if (it->output == OUTPUT_XML) {
sho_oct(stdout, 'd', "devicetype", sa->st_rdev, sb->st_rdev);
} else {
show_diff_type(stdout, sa->st_rdev, sb->st_rdev);
}
}
if (diffs & RULE_NLINK)
sho_long(stdout, 'l', "nlinks", sa->st_nlink, sb->st_nlink);
if (diffs & RULE_UID)
sho_long(stdout, 'u', "uid", sa->st_uid, sb->st_uid);
if (diffs & RULE_GID)
sho_long(stdout, 'g', "gid", sa->st_gid, sb->st_gid);
if (diffs & RULE_SIZE)
sho_long(stdout, 'z', "size", sa->st_size, sb->st_size);
if (diffs & RULE_ATIME)
sho_time(stdout, 'a', "access_time", sa->st_atime, sb->st_atime);
if (diffs & RULE_MTIME)
sho_time(stdout, 'm', "modification_time", sa->st_mtime, sb->st_mtime);
if (diffs & RULE_CTIME)
sho_time(stdout, 'c', "change_time", sa->st_ctime, sb->st_ctime);
if (it->output == OUTPUT_XML)
XML_END_PRINT(stdout, "change");
putc('\n', stdout);
}
static void report_stat_differences(integrit_t *it,
fileinfo *currinf, dbinfo *old)
{
struct stat *sa = &old->stat;
struct stat *sb = &currinf->dbinf.stat;
const char *path = currinf->path;
unsigned long flags = fileinfo_ruleset(it, currinf);
unsigned long diffs = 0;
if ((flags & RULE_INODE)
&& (sa->st_ino != sb->st_ino))
diffs |= RULE_INODE;
if ((flags & RULE_PERMS)
&& ((sa->st_mode & PERM_MASK) != (sb->st_mode & PERM_MASK)))
diffs |= RULE_PERMS;
if ((flags & RULE_TYPE)
&& ((sa->st_mode & S_IFMT) != (sb->st_mode & S_IFMT)))
diffs |= RULE_TYPE;
if ((flags & RULE_DEVICETYPE)
&& ((S_ISCHR(sa->st_mode) || S_ISBLK(sa->st_mode))
&& ((S_ISCHR(sb->st_mode) || S_ISBLK(sb->st_mode)))
&& (sa->st_rdev != sb->st_rdev)))
diffs |= RULE_DEVICETYPE;
if ((flags & RULE_NLINK)
&& (sa->st_nlink != sb->st_nlink))
diffs |= RULE_NLINK;
if ((flags & RULE_UID)
&& (sa->st_uid != sb->st_uid))
diffs |= RULE_UID;
if ((flags & RULE_GID)
&& (sa->st_gid != sb->st_gid))
diffs |= RULE_GID;
if ((flags & RULE_SIZE)
&& (sa->st_size != sb->st_size))
diffs |= RULE_SIZE;
if ((flags & RULE_ATIME)
&& (sa->st_atime != sb->st_atime))
diffs |= RULE_ATIME;
if ((flags & RULE_MTIME)
&& (sa->st_mtime != sb->st_mtime))
diffs |= RULE_MTIME;
if ((flags & RULE_CTIME) && (! (flags & RULE_RESET_ATIME))
&& (sa->st_ctime != sb->st_ctime))
diffs |= RULE_CTIME;
if (diffs) {
it->exit_status |= INTEGRIT_EXIT_CHANGES;
show_diffs(it, path, diffs, sa, sb);
}
}
/* report that the checksum has changed. */
static void report_sumchange(integrit_t *it, const char *path,
const unsigned char *old, size_t oldsiz,
const unsigned char *new, size_t newsiz)
{
it->exit_status |= INTEGRIT_EXIT_CHANGES;
switch (it->output) {
case OUTPUT_LINES:
printf("changed: %s s(", path);
hexprint(stdout, old, oldsiz);
putc(':', stdout);
hexprint(stdout, new, newsiz);
fputs(")\n", stdout);
break;
case OUTPUT_XML:
XML_CHANGE_START_PRINT(stdout, ALGO_NAME, path);
XML_START_PRINT(stdout, "old");
hexprint(stdout, old, oldsiz);
XML_END_PRINT(stdout, "old");
XML_START_PRINT(stdout, "new");
hexprint(stdout, new, newsiz);
XML_END_PRINT(stdout, "new");
XML_END_PRINT(stdout, "change");
putc('\n', stdout);
break;
default:
abort(); /* shouldn't happen */
}
}
static void report_differences(integrit_t *it, fileinfo *currinf)
{
dbinfo old;
struct cdb *knowndb = &it->knowndb;
size_t knownsiz = cdb_datalen(knowndb);
char *path = currinf->path;
unsigned long flags = fileinfo_ruleset(it, currinf);
if (knownsiz != sizeof(old)
&& knownsiz != sizeof(old.stat))
die(__FUNCTION__, "Error: bad db entry for file (%s)", path);
/* in do_check we already did cdb_find (and cdb_datalen) */
if (cdb_get(knowndb, &old) == -1)
die(__FUNCTION__, "Error: cdb_get entry for file (%s)", path);
if (S_ISREG(currinf->dbinf.stat.st_mode) ||
S_ISLNK(currinf->dbinf.stat.st_mode)) {
/* if it's a regular file or symlink */
if (flags & RULE_SUM) {
/* clean the old checksum buffer when needed */
if (knownsiz != sizeof(old))
memset(old.sum, 0, DIGEST_LENGTH);
if (! currinf->did_sum)
currinf->did_sum = do_checksum(it, currinf);
if (currinf->did_sum &&
memcmp(currinf->dbinf.sum, old.sum, sizeof(old.sum)))
report_sumchange(it, path, old.sum, sizeof(old.sum),
currinf->dbinf.sum, sizeof(currinf->dbinf.sum));
}
}
report_stat_differences(it, currinf, &old);
}
void show_xml_long(FILE *out, const char *type, long val)
{
xml_start_print(out, type);
fprintf(out, "%ld", val);
xml_end_print(out, type);
}
void show_xml_octal(FILE *out, const char *type, unsigned long val)
{
xml_start_print(out, type);
fprintf(out, "%lo", val);
xml_end_print(out, type);
}
/* similar to utils/show.c: show_entry */
static void report_newfile(integrit_t *it, fileinfo *inf)
{
char *path = inf->path;
struct stat *s = &inf->dbinf.stat;
unsigned long flags = fileinfo_ruleset(it, inf);
switch (it->output) {
case OUTPUT_XML:
XML_CHANGE_START_PRINT(stdout, "newfile", path);
show_xml_octal(stdout, "permissions", s->st_mode & PERM_MASK);
show_xml_octal(stdout, "type", s->st_mode & S_IFMT);
if (S_ISBLK(s->st_mode) || S_ISCHR(s->st_mode)) {
show_xml_octal(stdout, "devicetype", s->st_rdev);
}
show_xml_long(stdout, "uid", s->st_uid);
show_xml_long(stdout, "gid", s->st_gid);
show_xml_long(stdout, "size", s->st_size);
show_xml_long(stdout, "modification_time", s->st_mtime);
XML_END_PRINT(stdout, "change");
break;
case OUTPUT_LINES:
/* use some extra spaces for alignment
* with "missing:" and "changed:" */
printf("new: %s ", path); /* this file wasn't in known db */
show_octal(stdout, 'p', s->st_mode & PERM_MASK);
show_octal(stdout, 't', s->st_mode & S_IFMT);
if (S_ISBLK(s->st_mode) || S_ISCHR(s->st_mode)) {
show_octal(stdout, 'd', s->st_rdev);
}
show_long(stdout, 'u', s->st_uid);
show_long(stdout, 'g', s->st_gid);
show_long(stdout, 'z', s->st_size);
show_time(stdout, 'm', s->st_mtime);
break;
default:
abort(); /* this shouldn't happen */
break;
}
putc('\n', stdout);
/* If it's a regular file or symlink, show the checksum */
if (S_ISREG(s->st_mode) || S_ISLNK(s->st_mode)) {
if (flags & RULE_SUM) {
if (! inf->did_sum)
inf->did_sum = do_checksum(it, inf);
if (inf->did_sum) {
if (it->output == OUTPUT_XML) {
char zerosum[DIGEST_LENGTH];
memset(zerosum, 0, sizeof(zerosum));
report_sumchange(it, path,
(const unsigned char *)zerosum, sizeof(zerosum),
inf->dbinf.sum, sizeof(inf->dbinf.sum));
} else {
printf("new: %s ", path);
show_checksum(stdout, inf->dbinf.sum, sizeof(inf->dbinf.sum));
putc('\n', stdout);
}
}
}
}
}
inline static void do_check(integrit_t *it, fileinfo *inf)
{
struct cdb *db = &it->knowndb;
int err;
if ( (err = cdb_find(db, inf->path, inf->pathlen)) == -1)
die(__FUNCTION__,
"Error: looking up file (%s) in known database (%s): %s",
inf->path, it->knowndbname, strerror(errno));
if (!err) {
it->exit_status |= INTEGRIT_EXIT_CHANGES;
report_newfile(it, inf);
} else {
report_differences(it, inf);
}
}
inline static int do_update(integrit_t *it, fileinfo *inf)
{
struct cdb_make *db = &it->currdb;
dbinfo *dbinf = &inf->dbinf;
size_t datasiz;
if (S_ISREG(dbinf->stat.st_mode) ||
S_ISLNK(dbinf->stat.st_mode)) {
if (fileinfo_ruleset(it, inf) & RULE_SUM) {
/* BUGGISH: don't test inf->did_sum, since this function's called
* before do_check (very minorly buggish :)
*/
inf->did_sum = do_checksum(it, inf);
if (! inf->did_sum)
return 0;
}
}
datasiz = inf->did_sum ? sizeof(*dbinf) : sizeof(dbinf->stat);
if (cdb_put(db, inf->path, inf->pathlen, dbinf, datasiz) == -1)
DIE("adding record to current-state db");
return 1;
}
wft_ret_t process_file(const char *path, const struct stat *sb, void *data)
{
integrit_t *it = (integrit_t *) data;
fileinfo inf; /* initialize before use */
checkset *cset;
size_t plen = strlen(path);
char *pathcopy = xstrdup(path);
char *p = pathcopy;
#if defined(DEBUG) && 0
static int counter;
#endif
if (p[0] == '/' && p[1] == '/') {
++p; /* pass the first of double initial slashes */
--plen;
}
if (plen > 2
&& p[plen - 2] == '/'
&& p[plen - 1] == '.') {
/* ignore trailing "/." */
p[plen - 2] = '\0';
plen -= 2;
} else if (plen == 2
&& p[0] == '/'
&& p[1] == '.') {
/* it's "/." */
p[1] = '\0';
--plen;
}
#if defined(DEBUG) && 0
fprintf(stderr, "debug (%s): count (%d) path (%s)\n",
__FUNCTION__, ++counter, p); /* debug */
usleep(5); /* debug */
#endif
/* initialize inf now that we've settled on a file path */
fileinfo_init(&inf, p, plen);
cset = hashtbl_lookup(it->ruleset, p, plen);
/* see whether checkset includes boolean to ignore the file */
if (cset && (cset->flags & RULE_IGNORE)) {
#ifdef DEBUG
fprintf(stderr, "debug: ignoring file (%s)\n", p);
#endif
free(pathcopy);
return WFT_PRUNE;
}
memcpy(&inf.dbinf.stat, sb, sizeof(inf.dbinf.stat));
if (it->do_update) {
if (! do_update(it, &inf)) {
free(pathcopy);
return WFT_ERROR;
}
}
if (it->do_check)
do_check(it, &inf);
free(pathcopy);
/* see whether the nochildren boolean is true in this checkset */
if (cset && (cset->flags & RULE_NOCHILDREN)) {
#ifdef DEBUG
fprintf(stderr, "debug: no children for file (%s)\n", path);
#endif
return WFT_PRUNE;
}
return WFT_PROCEED;
}