Audit tar(1), add DIRFIRST-flag to recurse()
I've been wanting to do this for a while now, as tar(1) used to
be one of messiest and cruftiest tools.
First off, before walking through the audit, I'll talk about
what the DIRFIRST-flag for recurse() does.
It basically calls fn() on the first-level-dir before calling
it's subentries. It's necessary here, because else the order
of the tar-files would've been wrong (it would try to create
dir/file before creating dir/).
Now, to the audit:
1) Update manpage, fix mistake that compression is also available
for compressing. It's only available for extracting.
2) Define the major, minor and makedev macros from glibc by ourselves.
No need to rely on them, as they are common sense.
decomp()
3) Simple refactorization.
putoctal()
4) Add a truncation check for snprintf().
archive()
5) BUGFIX: Add checks to any checkable function, don't blindly call
them, this is harmful and there are 100 ways to exploit that.
6) Use estrlcpy() instead of snprintf() wherever possible, fix
alignment.
7) BUGFIX: Terminate the result-buffer of readlink(), check if
it even succeeded.
8) Fix sizeof()-formatting.
unarchive()
9) BUGFIX: Add checks to any checkable function, don't blindly call
them, this is harmful and there are 100 ways to exploit that.
10) BUGFIX: strtoul can happily return negative numbers. Add checks
for that and also if the full string has been processed.
11) Remove calls to perror(). We have eprintf, use it.
12) BUGFIX: "minor = strtoul(h->mode, 0, 8);". We need h->minor of
course.
13) Fix typo "usupported", remove fprintf-call.
print()
14) Check fread().
xt()
15) Get rid of snprintf-magic. Use estrlcat().
16) BUGFIX: check for ferror() on the tarfile.
usage()
17) Update it. The old usage() was like 1000 years old.
main()
18) Add DIRFIRST-flag to the recursor.
19) Don't print usage() when a mode is re-set. We allow this in
general.
20) Add function checks and fix error messages.
21) Add tarfilename-global for proper error-messages.
This commit is contained in:
FRIGN
parent
a531865fe5
commit
b6b977f63d
2
README
2
README
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@ -72,7 +72,7 @@ The following tools are implemented ('*' == finished, '#' == UTF-8 support,
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#*| strings yes none
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=*| sync non-posix none
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=*| tail yes none
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=* tar non-posix none
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=*| tar non-posix none
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=*| tee yes none
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=*| test yes none
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=*| time yes none
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1
fs.h
1
fs.h
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@ -18,6 +18,7 @@ struct recursor {
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enum {
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SAMEDEV = 1 << 0,
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DIRFIRST = 1 << 1,
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};
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extern int cp_aflag;
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@ -58,6 +58,9 @@ recurse(const char *path, void *data, struct recursor *r)
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return;
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}
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if (!r->depth && (r->flags & DIRFIRST))
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(r->fn)(path, &st, data, r);
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while ((d = readdir(dp))) {
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if (r->follow == 'H') {
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statf_name = "lstat";
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@ -82,6 +85,7 @@ recurse(const char *path, void *data, struct recursor *r)
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}
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if (!r->depth) {
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if (!(r->flags & DIRFIRST))
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(r->fn)(path, &st, data, r);
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for (; r->hist; ) {
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11
tar.1
11
tar.1
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@ -1,4 +1,4 @@
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.Dd February 8, 2015
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.Dd March 21, 2015
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.Dt TAR 1
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.Os sbase
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.Sh NAME
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@ -13,15 +13,8 @@
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.Nm
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.Op Fl C Ar dir
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.Op Fl h
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.Op Fl j | Fl z
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.Fl c Ar dir
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.Op Fl f Ar file
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.Nm
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.Op Fl C Ar dir
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.Op Fl h
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.Op Fl j | Fl z
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.Fl cf
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.Ar file Ar dir
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.Sh DESCRIPTION
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.Nm
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is the standard file archiver.
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@ -47,7 +40,7 @@ Extract archive.
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.It Fl h
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Always dereference symbolic links while recursively traversing directories.
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.It Fl j | Fl z
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Use bzip2 | gzip compression. The
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Use bzip2 | gzip decompression. The
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.Xr bzip2 1 |
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.Xr gzip 1
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utilities must be installed separately.
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251
tar.c
251
tar.c
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@ -2,6 +2,7 @@
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <errno.h>
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#include <grp.h>
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#include <pwd.h>
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#include <stdio.h>
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@ -33,12 +34,20 @@ struct header {
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#define BLKSIZ 512
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#undef major
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#define major(dev) ((int)(((unsigned int)(dev) >> 8) & 0xff))
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#undef minor
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#define minor(dev) ((int)((dev) & 0xff))
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#undef makedev
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#define makedev(major, minor) (((major) << 8) | (minor))
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enum Type {
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REG = '0', AREG = '\0', HARDLINK = '1', SYMLINK = '2', CHARDEV = '3',
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BLOCKDEV = '4', DIRECTORY = '5', FIFO = '6'
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};
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static FILE *tarfile;
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static char *tarfilename;
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static ino_t tarinode;
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static dev_t tardev;
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@ -49,6 +58,7 @@ static FILE *
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decomp(FILE *fp)
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{
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int fds[2];
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char *tool;
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if (pipe(fds) < 0)
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eprintf("pipe:");
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@ -62,51 +72,56 @@ decomp(FILE *fp)
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close(fds[0]);
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close(fds[1]);
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switch (filtermode) {
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case 'j':
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execlp("bzip2", "bzip2", "-cd", NULL);
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weprintf("execlp bzip2:");
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tool = (filtermode == 'j') ? "bzip2" : "gzip";
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execlp(tool, tool, "-cd", NULL);
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weprintf("execlp %s:", tool);
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_exit(1);
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case 'z':
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execlp("gzip", "gzip", "-cd", NULL);
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weprintf("execlp gzip:");
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_exit(1);
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}
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}
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close(fds[1]);
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return fdopen(fds[0], "r");
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}
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static void
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putoctal(char *dst, unsigned num, int n)
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putoctal(char *dst, unsigned num, int size)
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{
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snprintf(dst, n, "%.*o", n - 1, num);
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if (snprintf(dst, size, "%.*o", size - 1, num) >= size)
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eprintf("snprintf: input number too large\n");
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}
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static int
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archive(const char *path)
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{
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FILE *f = NULL;
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mode_t mode;
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struct group *gr;
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struct header *h;
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struct passwd *pw;
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struct stat st;
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size_t chksum, x;
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ssize_t l;
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ssize_t l, r;
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unsigned char b[BLKSIZ];
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lstat(path, &st);
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if (st.st_ino == tarinode && st.st_dev == tardev) {
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fprintf(stderr, "ignoring '%s'\n", path);
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if (lstat(path, &st) < 0) {
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weprintf("lstat %s:", path);
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return 0;
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} else if (st.st_ino == tarinode && st.st_dev == tardev) {
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weprintf("ignoring %s\n", path);
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return 0;
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}
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errno = 0;
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if (!(pw = getpwuid(st.st_uid)) && errno) {
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weprintf("getpwuid:");
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return 0;
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}
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errno = 0;
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if (!(gr = getgrgid(st.st_gid)) && errno) {
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weprintf("getgrgid:");
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return 0;
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}
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pw = getpwuid(st.st_uid);
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gr = getgrgid(st.st_gid);
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h = (void *)b;
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memset(b, 0, sizeof(b));
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snprintf(h->name, sizeof(h->name), "%s", path);
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estrlcpy(h->name, path, sizeof(h->name));
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putoctal(h->mode, (unsigned)st.st_mode & 0777, sizeof(h->mode));
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putoctal(h->uid, (unsigned)st.st_uid, sizeof(h->uid));
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putoctal(h->gid, (unsigned)st.st_gid, sizeof(h->gid));
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@ -114,123 +129,145 @@ archive(const char* path)
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putoctal(h->mtime, (unsigned)st.st_mtime, sizeof(h->mtime));
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memcpy( h->magic, "ustar", sizeof(h->magic));
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memcpy( h->version, "00", sizeof(h->version));
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snprintf(h->uname, sizeof h->uname, "%s", pw ? pw->pw_name : "");
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snprintf(h->gname, sizeof h->gname, "%s", gr ? gr->gr_name : "");
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estrlcpy(h->uname, pw ? pw->pw_name : "", sizeof(h->uname));
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estrlcpy(h->gname, gr ? gr->gr_name : "", sizeof(h->gname));
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mode = st.st_mode;
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if (S_ISREG(mode)) {
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if (S_ISREG(st.st_mode)) {
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h->type = REG;
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putoctal(h->size, (unsigned)st.st_size, sizeof h->size);
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putoctal(h->size, (unsigned)st.st_size, sizeof(h->size));
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f = fopen(path, "r");
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} else if (S_ISDIR(mode)) {
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} else if (S_ISDIR(st.st_mode)) {
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h->type = DIRECTORY;
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} else if (S_ISLNK(mode)) {
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} else if (S_ISLNK(st.st_mode)) {
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h->type = SYMLINK;
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readlink(path, h->link, (sizeof h->link)-1);
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} else if (S_ISCHR(mode) || S_ISBLK(mode)) {
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h->type = S_ISCHR(mode) ? CHARDEV : BLOCKDEV;
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#if defined(major) && defined(minor)
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putoctal(h->major, (unsigned)major(st.st_dev), sizeof h->major);
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putoctal(h->minor, (unsigned)minor(st.st_dev), sizeof h->minor);
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#else
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return 0;
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#endif
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} else if (S_ISFIFO(mode)) {
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if ((r = readlink(path, h->link, sizeof(h->link) - 1)) < 0)
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eprintf("readlink %s:", path);
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h->link[r] = '\0';
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} else if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
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h->type = S_ISCHR(st.st_mode) ? CHARDEV : BLOCKDEV;
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putoctal(h->major, (unsigned)major(st.st_dev), sizeof(h->major));
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putoctal(h->minor, (unsigned)minor(st.st_dev), sizeof(h->minor));
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} else if (S_ISFIFO(st.st_mode)) {
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h->type = FIFO;
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}
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memset(h->chksum, ' ', sizeof h->chksum);
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for (x = 0, chksum = 0; x < sizeof *h; x++)
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memset(h->chksum, ' ', sizeof(h->chksum));
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for (x = 0, chksum = 0; x < sizeof(*h); x++)
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chksum += b[x];
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putoctal(h->chksum, chksum, sizeof h->chksum);
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putoctal(h->chksum, chksum, sizeof(h->chksum));
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fwrite(b, BLKSIZ, 1, tarfile);
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if (!f)
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return 0;
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if (fwrite(b, BLKSIZ, 1, tarfile) != 1)
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eprintf("fwrite:");
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if (f) {
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while ((l = fread(b, 1, BLKSIZ, f)) > 0) {
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if (l < BLKSIZ)
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memset(b + l, 0, BLKSIZ - l);
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fwrite(b, BLKSIZ, 1, tarfile);
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if (fwrite(b, BLKSIZ, 1, tarfile) != 1)
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eprintf("fwrite:");
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}
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fclose(f);
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if (fclose(f) == EOF)
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eprintf("fclose %s:", path);
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}
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return 0;
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}
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static int
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unarchive(char *fname, int l, char b[BLKSIZ])
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unarchive(char *fname, ssize_t l, char b[BLKSIZ])
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{
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FILE *f = NULL;
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struct timeval times[2];
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struct header *h = (void *)b;
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unsigned long mode, major, minor, type, mtime;
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char lname[101];
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long mode, major, minor, type, mtime, uid, gid;
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char lname[101], *p;
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if (!mflag && ((mtime = strtoul(h->mtime, &p, 8)) < 0 || *p != '\0'))
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eprintf("strtoul %s: invalid number\n", h->mtime);
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if (unlink(fname) < 0 && errno != ENOENT && errno != EISDIR)
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eprintf("unlink %s:", fname);
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if (!mflag)
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mtime = strtoul(h->mtime, 0, 8);
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unlink(fname);
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switch (h->type) {
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case REG:
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case AREG:
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mode = strtoul(h->mode, 0, 8);
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if (!(f = fopen(fname, "w")) || chmod(fname, mode))
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perror(fname);
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if ((mode = strtoul(h->mode, &p, 8)) < 0 || *p != '\0')
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eprintf("strtoul %s: invalid number\n", h->mode);
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if (!(f = fopen(fname, "w")))
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eprintf("fopen %s:", fname);
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if (chmod(fname, mode) < 0)
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eprintf("chmod %s:", fname);
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break;
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case HARDLINK:
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case SYMLINK:
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snprintf(lname, sizeof lname, "%s", h->link);
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if (!((h->type == HARDLINK) ? link : symlink)(lname, fname))
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perror(fname);
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estrlcpy(lname, h->link, sizeof(lname));
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if (((h->type == HARDLINK) ? link : symlink)(lname, fname) < 0)
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eprintf("%s %s -> %s:",
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(h->type == HARDLINK) ? "link" : "symlink",
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fname, lname);
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break;
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case DIRECTORY:
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mode = strtoul(h->mode, 0, 8);
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if (mkdir(fname, (mode_t)mode))
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perror(fname);
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if ((mode = strtoul(h->mode, &p, 8)) < 0 || *p != '\0')
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eprintf("strtoul %s: invalid number\n", h->mode);
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if (mkdir(fname, (mode_t)mode) < 0 && errno != EEXIST)
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eprintf("mkdir %s:", fname);
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break;
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case CHARDEV:
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case BLOCKDEV:
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#ifdef makedev
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mode = strtoul(h->mode, 0, 8);
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major = strtoul(h->major, 0, 8);
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minor = strtoul(h->mode, 0, 8);
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if ((mode = strtoul(h->mode, &p, 8)) < 0 || *p != '\0')
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eprintf("strtoul %s: invalid number\n", h->mode);
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if ((major = strtoul(h->major, &p, 8)) < 0 || *p != '\0')
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eprintf("strtoul %s: invalid number\n", h->major);
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if ((minor = strtoul(h->minor, &p, 8)) < 0 || *p != '\0')
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eprintf("strtoul %s: invalid number\n", h->minor);
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type = (h->type == CHARDEV) ? S_IFCHR : S_IFBLK;
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if (mknod(fname, type | mode, makedev(major, minor)))
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perror(fname);
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#endif
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if (mknod(fname, type | mode, makedev(major, minor)) < 0)
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eprintf("mknod %s:", fname);
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break;
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case FIFO:
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mode = strtoul(h->mode, 0, 8);
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if (mknod(fname, S_IFIFO | mode, 0))
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perror(fname);
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if ((mode = strtoul(h->mode, &p, 8)) < 0 || *p != '\0')
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eprintf("strtoul %s: invalid number\n", h->mode);
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if (mknod(fname, S_IFIFO | mode, 0) < 0)
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eprintf("mknod %s:", fname);
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break;
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default:
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fprintf(stderr, "usupported tarfiletype %c\n", h->type);
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eprintf("unsupported tar-filetype %c\n", h->type);
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}
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if (getuid() == 0 && chown(fname, strtoul(h->uid, 0, 8), strtoul(h->gid, 0, 8)))
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perror(fname);
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if ((uid = strtoul(h->uid, &p, 8)) < 0 || *p != '\0')
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eprintf("strtoul %s: invalid number\n", h->uid);
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if ((gid = strtoul(h->gid, &p, 8)) < 0 || *p != '\0')
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eprintf("strtoul %s: invalid number\n", h->gid);
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if (!getuid() && chown(fname, uid, gid))
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eprintf("chown %s:", fname);
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for (; l > 0; l -= BLKSIZ) {
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fread(b, BLKSIZ, 1, tarfile);
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if (f)
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fwrite(b, MIN(l, 512), 1, f);
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if (fread(b, BLKSIZ, 1, tarfile) != 1)
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eprintf("fread %s:", tarfilename);
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if (f && fwrite(b, MIN(l, BLKSIZ), 1, f) != 1)
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eprintf("fwrite %s:", fname);
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}
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if (f)
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fclose(f);
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if (f && fclose(f) == EOF)
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eprintf("fclose %s:", fname);
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if (!mflag) {
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times[0].tv_sec = times[1].tv_sec = mtime;
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times[0].tv_usec = times[1].tv_usec = 0;
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if (utimes(fname, times))
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perror(fname);
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if (utimes(fname, times) < 0)
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eprintf("utimes %s:", fname);
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}
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return 0;
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}
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static int
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print(char * fname, int l, char b[BLKSIZ])
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print(char *fname, ssize_t l, char b[BLKSIZ])
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{
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puts(fname);
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for (; l > 0; l -= BLKSIZ)
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fread(b, BLKSIZ, 1, tarfile);
|
||||
if (fread(b, BLKSIZ, 1, tarfile) != 1)
|
||||
eprintf("fread %s:", tarfilename);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -244,32 +281,42 @@ c(const char *path, struct stat *st, void *data, struct recursor *r)
|
|||
}
|
||||
|
||||
static void
|
||||
xt(int (*fn)(char *, int, char[BLKSIZ]))
|
||||
xt(int (*fn)(char *, ssize_t, char[BLKSIZ]))
|
||||
{
|
||||
char b[BLKSIZ], fname[257], *s;
|
||||
struct header *h = (void*)b;
|
||||
struct header *h;
|
||||
long size;
|
||||
char b[BLKSIZ], fname[256 + 1], *p;
|
||||
|
||||
while (fread(b, BLKSIZ, 1, tarfile) && h->name[0] != '\0') {
|
||||
s = fname;
|
||||
if (h->prefix[0] != '\0')
|
||||
s += sprintf(s, "%.*s/", (int)sizeof h->prefix, h->prefix);
|
||||
sprintf(s, "%.*s", (int)sizeof h->name, h->name);
|
||||
fn(fname, strtol(h->size, 0, 8), b);
|
||||
h = (void *)b;
|
||||
|
||||
while (fread(b, BLKSIZ, 1, tarfile) == 1 && *(h->name)) {
|
||||
fname[0] = '\0';
|
||||
if (*(h->prefix)) {
|
||||
estrlcat(fname, h->prefix, sizeof(fname));
|
||||
estrlcat(fname, "/", sizeof(fname));
|
||||
}
|
||||
estrlcat(fname, h->name, sizeof(fname));
|
||||
if ((size = strtoul(h->size, &p, 8)) < 0 || *p != '\0')
|
||||
eprintf("strtoul %s: invalid number\n", h->size);
|
||||
|
||||
fn(fname, size, b);
|
||||
}
|
||||
if (ferror(tarfile))
|
||||
eprintf("fread %s:", tarfilename);
|
||||
}
|
||||
|
||||
static void
|
||||
usage(void)
|
||||
{
|
||||
eprintf("usage: tar [-f tarfile] [-C dir] -j|z -x[m]|t\n"
|
||||
" tar [-f tarfile] [-C dir] -c dir\n");
|
||||
eprintf("usage: %s [-C dir] [-j | -z] -x [-m | -t] [-f file]\n"
|
||||
" %s [-C dir] [-h] -c dir [-f file]\n", argv0, argv0);
|
||||
}
|
||||
|
||||
int
|
||||
main(int argc, char *argv[])
|
||||
{
|
||||
FILE *fp;
|
||||
struct recursor r = { .fn = c, .hist = NULL, .depth = 0, .follow = 'P', .flags = 0};
|
||||
struct recursor r = { .fn = c, .hist = NULL, .depth = 0, .follow = 'P', .flags = DIRFIRST};
|
||||
struct stat st;
|
||||
char *file = NULL, *dir = ".", mode = '\0';
|
||||
|
||||
|
|
@ -277,8 +324,6 @@ main(int argc, char *argv[])
|
|||
case 'x':
|
||||
case 'c':
|
||||
case 't':
|
||||
if (mode)
|
||||
usage();
|
||||
mode = ARGC();
|
||||
break;
|
||||
case 'C':
|
||||
|
|
@ -292,8 +337,6 @@ main(int argc, char *argv[])
|
|||
break;
|
||||
case 'j':
|
||||
case 'z':
|
||||
if (filtermode)
|
||||
usage();
|
||||
filtermode = ARGC();
|
||||
break;
|
||||
case 'h':
|
||||
|
|
@ -312,14 +355,17 @@ main(int argc, char *argv[])
|
|||
if (!(fp = fopen(file, "w")))
|
||||
eprintf("fopen %s:", file);
|
||||
if (lstat(file, &st) < 0)
|
||||
eprintf("tar: stat '%s':", file);
|
||||
eprintf("lstat %s:", file);
|
||||
tarinode = st.st_ino;
|
||||
tardev = st.st_dev;
|
||||
tarfile = fp;
|
||||
tarfilename = file;
|
||||
} else {
|
||||
tarfile = stdout;
|
||||
tarfilename = "<stdout>";
|
||||
}
|
||||
chdir(dir);
|
||||
if (chdir(dir) < 0)
|
||||
eprintf("chdir %s:", dir);
|
||||
recurse(argv[0], NULL, &r);
|
||||
break;
|
||||
case 't':
|
||||
|
|
@ -331,6 +377,8 @@ main(int argc, char *argv[])
|
|||
fp = stdin;
|
||||
}
|
||||
|
||||
tarfilename = file;
|
||||
|
||||
switch (filtermode) {
|
||||
case 'j':
|
||||
case 'z':
|
||||
|
|
@ -341,8 +389,9 @@ main(int argc, char *argv[])
|
|||
break;
|
||||
}
|
||||
|
||||
chdir(dir);
|
||||
xt(mode == 'x' ? unarchive : print);
|
||||
if (chdir(dir) < 0)
|
||||
eprintf("chdir %s:", dir);
|
||||
xt((mode == 'x') ? unarchive : print);
|
||||
break;
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user