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Split out digest matching into its own file.

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This commit is contained in:
Todd C. Miller
2019-02-17 06:47:37 -07:00
parent 1e6e048180
commit a04409747c
3 changed files with 40 additions and 85 deletions
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72
plugins/sudoers/match.c
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@@ -84,7 +84,6 @@ static bool command_matches_glob(const char *sudoers_cmnd, const char *sudoers_a
#endif
static bool command_matches_fnmatch(const char *sudoers_cmnd, const char *sudoers_args, const struct command_digest *digest);
static bool command_matches_normal(const char *sudoers_cmnd, const char *sudoers_args, const struct command_digest *digest);
static bool digest_matches(int fd, const char *file, const struct command_digest *digest);
/*
* Returns true if string 's' contains meta characters.
@@ -817,79 +816,8 @@ command_matches_normal(const char *sudoers_cmnd, const char *sudoers_args, const
debug_return_bool(false);
}
static bool
digest_matches(int fd, const char *file, const struct command_digest *digest)
{
debug_decl(digest_matches, SUDOERS_DEBUG_MATCH)
/* Digests are not supported when matching only by name. */
debug_return_bool(false);
}
#else /* !SUDOERS_NAME_MATCH */
static bool
digest_matches(int fd, const char *file, const struct command_digest *digest)
{
unsigned char *file_digest = NULL;
unsigned char *sudoers_digest = NULL;
bool matched = false;
size_t digest_len;
debug_decl(digest_matches, SUDOERS_DEBUG_MATCH)
file_digest = sudo_filedigest(fd, file, digest->digest_type, &digest_len);
if (lseek(fd, (off_t)0, SEEK_SET) == -1) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO|SUDO_DEBUG_LINENO,
"unable to rewind digest fd");
}
if (file_digest == NULL) {
/* Warning (if any) printed by sudo_filedigest() */
goto done;
}
/* Convert the command digest from ascii to binary. */
if ((sudoers_digest = malloc(digest_len)) == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
goto done;
}
if (strlen(digest->digest_str) == digest_len * 2) {
/* Convert ascii hex to binary. */
unsigned int i;
for (i = 0; i < digest_len; i++) {
const int h = hexchar(&digest->digest_str[i + i]);
if (h == -1)
goto bad_format;
sudoers_digest[i] = (unsigned char)h;
}
} else {
/* Convert base64 to binary. */
size_t len = base64_decode(digest->digest_str, sudoers_digest, digest_len);
if (len != digest_len) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
"incorrect length for digest, expected %zu, got %zu",
digest_len, len);
goto bad_format;
}
}
if (memcmp(file_digest, sudoers_digest, digest_len) == 0) {
matched = true;
} else {
sudo_debug_printf(SUDO_DEBUG_DIAG|SUDO_DEBUG_LINENO,
"%s digest mismatch for %s, expecting %s",
digest_type_to_name(digest->digest_type), file, digest->digest_str);
}
goto done;
bad_format:
sudo_warnx(U_("digest for %s (%s) is not in %s form"), file,
digest->digest_str, digest_type_to_name(digest->digest_type));
done:
free(sudoers_digest);
free(file_digest);
debug_return_bool(matched);
}
static bool
command_matches_normal(const char *sudoers_cmnd, const char *sudoers_args, const struct command_digest *digest)
{