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-rw-r--r--plugins/sudoers/auth/passwd.c122
1 files changed, 122 insertions, 0 deletions
diff --git a/plugins/sudoers/auth/passwd.c b/plugins/sudoers/auth/passwd.c
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+++ b/plugins/sudoers/auth/passwd.c
@@ -0,0 +1,122 @@
+/*
+ * 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);
+
+#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, char *pass, sudo_auth *auth, struct sudo_conv_callback *callback)
+{
+ char sav, *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.
+ * If this turns out not to be safe we will have to use OS #ifdef's (sigh).
+ */
+ sav = pass[8];
+ pw_len = strlen(pw_epasswd);
+ if (pw_len == DESLEN || HAS_AGEINFO(pw_epasswd, pw_len))
+ pass[8] = '\0';
+
+ /*
+ * 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);
+ pass[8] = sav;
+ 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);
+ }
+
+ debug_return_int(matched ? AUTH_SUCCESS : AUTH_FAILURE);
+}
+#else
+int
+sudo_passwd_verify(struct passwd *pw, 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)
+{
+ char *pw_epasswd = auth->data;
+ debug_decl(sudo_passwd_cleanup, SUDOERS_DEBUG_AUTH);
+
+ if (pw_epasswd != NULL)
+ freezero(pw_epasswd, strlen(pw_epasswd));
+
+ debug_return_int(AUTH_SUCCESS);
+}