1 files changed, 130 insertions, 0 deletions
diff --git a/plugins/sudoers/auth/passwd.c b/plugins/sudoers/auth/passwd.c
new file mode 100644
index 0000000..6967e4f
--- /dev/null
+++ b/plugins/sudoers/auth/passwd.c
@@ -0,0 +1,130 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 1999-2005, 2010-2015 Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Sponsored in part by the Defense Advanced Research Projects
+ * Agency (DARPA) and Air Force Research Laboratory, Air Force
+ * Materiel Command, USAF, under agreement number F39502-99-1-0512.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <pwd.h>
+
+#include "sudoers.h"
+#include "sudo_auth.h"
+
+#define DESLEN			13
+#define HAS_AGEINFO(p, l)	(l == 18 && p[DESLEN] == ',')
+
+int
+sudo_passwd_init(struct passwd *pw, sudo_auth *auth)
+{
+    debug_decl(sudo_passwd_init, SUDOERS_DEBUG_AUTH);
+
+    /* Only initialize once. */
+    if (auth->data != NULL)
+	debug_return_int(AUTH_SUCCESS);
+
+#ifdef HAVE_SKEYACCESS
+    if (skeyaccess(pw, user_tty, NULL, NULL) == 0)
+	debug_return_int(AUTH_FAILURE);
+#endif
+    sudo_setspent();
+    auth->data = sudo_getepw(pw);
+    sudo_endspent();
+    debug_return_int(auth->data ? AUTH_SUCCESS : AUTH_FATAL);
+}
+
+#ifdef HAVE_CRYPT
+int
+sudo_passwd_verify(struct passwd *pw, const char *pass, sudo_auth *auth, struct sudo_conv_callback *callback)
+{
+    char des_pass[9], *epass;
+    char *pw_epasswd = auth->data;
+    size_t pw_len;
+    int matched = 0;
+    debug_decl(sudo_passwd_verify, SUDOERS_DEBUG_AUTH);
+
+    /* An empty plain-text password must match an empty encrypted password. */
+    if (pass[0] == '\0')
+	debug_return_int(pw_epasswd[0] ? AUTH_FAILURE : AUTH_SUCCESS);
+
+    /*
+     * Truncate to 8 chars if standard DES since not all crypt()'s do this.
+     */
+    pw_len = strlen(pw_epasswd);
+    if (pw_len == DESLEN || HAS_AGEINFO(pw_epasswd, pw_len)) {
+	strlcpy(des_pass, pass, sizeof(des_pass));
+	pass = des_pass;
+    }
+
+    /*
+     * Normal UN*X password check.
+     * HP-UX may add aging info (separated by a ',') at the end so
+     * only compare the first DESLEN characters in that case.
+     */
+    epass = (char *) crypt(pass, pw_epasswd);
+    if (epass != NULL) {
+	if (HAS_AGEINFO(pw_epasswd, pw_len) && strlen(epass) == DESLEN)
+	    matched = !strncmp(pw_epasswd, epass, DESLEN);
+	else
+	    matched = !strcmp(pw_epasswd, epass);
+    }
+
+    explicit_bzero(des_pass, sizeof(des_pass));
+
+    debug_return_int(matched ? AUTH_SUCCESS : AUTH_FAILURE);
+}
+#else
+int
+sudo_passwd_verify(struct passwd *pw, const char *pass, sudo_auth *auth, struct sudo_conv_callback *callback)
+{
+    char *pw_passwd = auth->data;
+    int matched;
+    debug_decl(sudo_passwd_verify, SUDOERS_DEBUG_AUTH);
+
+    /* Simple string compare for systems without crypt(). */
+    matched = !strcmp(pass, pw_passwd);
+
+    debug_return_int(matched ? AUTH_SUCCESS : AUTH_FAILURE);
+}
+#endif
+
+int
+sudo_passwd_cleanup(struct passwd *pw, sudo_auth *auth, bool force)
+{
+    debug_decl(sudo_passwd_cleanup, SUDOERS_DEBUG_AUTH);
+
+    if (auth->data != NULL) {
+	/* Zero out encrypted password before freeing. */
+	size_t len = strlen((char *)auth->data);
+	freezero(auth->data, len);
+	auth->data = NULL;
+    }
+
+    debug_return_int(AUTH_SUCCESS);
+}