/* SPDX-License-Identifier: LGPL-2.1+ */
+#if HAVE_CRYPT_H
+/* libxcrypt is a replacement for glibc's libcrypt, and libcrypt might be
+ * removed from glibc at some point. As part of the removal, defines for
+ * crypt(3) are dropped from unistd.h, and we must include crypt.h instead.
+ *
+ * Newer versions of glibc (v2.0+) already ship crypt.h with a definition
+ * of crypt(3) as well, so we simply include it if it is present. MariaDB,
+ * MySQL, PostgreSQL, Perl and some other wide-spread packages do it the
+ * same way since ages without any problems.
+ */
+# include <crypt.h>
+#else
+# include <unistd.h>
+#endif
+
#include <errno.h>
#include <stdlib.h>
#include "alloc-util.h"
+#include "errno-util.h"
#include "libcrypt-util.h"
#include "log.h"
#include "macro.h"
+#include "memory-util.h"
#include "missing_stdlib.h"
#include "random-util.h"
#include "string-util.h"
int make_salt(char **ret) {
-#ifdef XCRYPT_VERSION_MAJOR
+#if HAVE_CRYPT_GENSALT_RA
const char *e;
char *salt;
- /* If we have libxcrypt we default to the "preferred method" (i.e. usually yescrypt), and generate it
- * with crypt_gensalt_ra(). */
+ /* If we have crypt_gensalt_ra() we default to the "preferred method" (i.e. usually yescrypt).
+ * crypt_gensalt_ra() is usually provided by libxcrypt. */
e = secure_getenv("SYSTEMD_CRYPT_PREFIX");
if (!e)
*ret = salt;
return 0;
#else
- /* If libxcrypt is not used, we use SHA512 and generate the salt on our own since crypt_gensalt_ra()
- * is not available. */
+ /* If crypt_gensalt_ra() is not available, we use SHA512 and generate the salt on our own. */
static const char table[] =
"abcdefghijklmnopqrstuvwxyz"
assert_cc(sizeof(table) == 64U + 1U);
+ log_debug("Generating fallback salt for hash prefix: $6$");
+
/* Insist on the best randomness by setting RANDOM_BLOCK, this is about keeping passwords secret after all. */
r = genuine_random_bytes(raw, sizeof(raw), RANDOM_BLOCK);
if (r < 0)
#endif
}
+#if HAVE_CRYPT_RA
+# define CRYPT_RA_NAME "crypt_ra"
+#else
+# define CRYPT_RA_NAME "crypt_r"
+
+/* Provide a poor man's fallback that uses a fixed size buffer. */
+
+static char* systemd_crypt_ra(const char *phrase, const char *setting, void **data, int *size) {
+ assert(data);
+ assert(size);
+
+ /* We allocate the buffer because crypt(3) says: struct crypt_data may be quite large (32kB in this
+ * implementation of libcrypt; over 128kB in some other implementations). This is large enough that
+ * it may be unwise to allocate it on the stack. */
+
+ if (!*data) {
+ *data = new0(struct crypt_data, 1);
+ if (!*data) {
+ errno = -ENOMEM;
+ return NULL;
+ }
+
+ *size = (int) (sizeof(struct crypt_data));
+ }
+
+ char *t = crypt_r(phrase, setting, *data);
+ if (!t)
+ return NULL;
+
+ /* crypt_r may return a pointer to an invalid hashed password on error. Our callers expect NULL on
+ * error, so let's just return that. */
+ if (t[0] == '*')
+ return NULL;
+
+ return t;
+}
+
+#define crypt_ra systemd_crypt_ra
+
+#endif
+
+int hash_password_full(const char *password, void **cd_data, int *cd_size, char **ret) {
+ _cleanup_free_ char *salt = NULL;
+ _cleanup_(erase_and_freep) void *_cd_data = NULL;
+ char *p;
+ int r, _cd_size = 0;
+
+ assert(!!cd_data == !!cd_size);
+
+ r = make_salt(&salt);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to generate salt: %m");
+
+ errno = 0;
+ p = crypt_ra(password, salt, cd_data ?: &_cd_data, cd_size ?: &_cd_size);
+ if (!p)
+ return log_debug_errno(errno_or_else(SYNTHETIC_ERRNO(EINVAL)),
+ CRYPT_RA_NAME "() failed: %m");
+
+ p = strdup(p);
+ if (!p)
+ return -ENOMEM;
+
+ *ret = p;
+ return 0;
+}
+
bool looks_like_hashed_password(const char *s) {
/* Returns false if the specified string is certainly not a hashed UNIX password. crypt(5) lists
* various hashing methods. We only reject (return false) strings which are documented to have
return !STR_IN_SET(s, "x", "*");
}
+
+int test_password_one(const char *hashed_password, const char *password) {
+ _cleanup_(erase_and_freep) void *cd_data = NULL;
+ int cd_size = 0;
+ const char *k;
+
+ errno = 0;
+ k = crypt_ra(password, hashed_password, &cd_data, &cd_size);
+ if (!k) {
+ if (errno == ENOMEM)
+ return -ENOMEM;
+ /* Unknown or unavailable hashing method or string too short */
+ return 0;
+ }
+
+ return streq(k, hashed_password);
+}
+
+int test_password_many(char **hashed_password, const char *password) {
+ char **hpw;
+ int r;
+
+ STRV_FOREACH(hpw, hashed_password) {
+ r = test_password_one(*hpw, password);
+ if (r < 0)
+ return r;
+ if (r > 0)
+ return true;
+ }
+
+ return false;
+}
projects / thirdparty / systemd.git / blobdiff