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Diffstat (limited to 'plugins/sudoers/auth/aix_auth.c')
-rw-r--r--plugins/sudoers/auth/aix_auth.c311
1 files changed, 311 insertions, 0 deletions
diff --git a/plugins/sudoers/auth/aix_auth.c b/plugins/sudoers/auth/aix_auth.c
new file mode 100644
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+++ b/plugins/sudoers/auth/aix_auth.c
@@ -0,0 +1,311 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 1999-2005, 2007-2018 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>
+
+#ifdef HAVE_AIXAUTH
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <errno.h>
+#include <pwd.h>
+#include <signal.h>
+#include <usersec.h>
+
+#include "sudoers.h"
+#include "sudo_auth.h"
+
+/*
+ * For a description of the AIX authentication API, see
+ * http://publib16.boulder.ibm.com/doc_link/en_US/a_doc_lib/libs/basetrf1/authenticate.htm
+ */
+
+#ifdef HAVE_PAM
+# define AIX_AUTH_UNKNOWN 0
+# define AIX_AUTH_STD 1
+# define AIX_AUTH_PAM 2
+
+static int
+sudo_aix_authtype(void)
+{
+ size_t linesize = 0;
+ ssize_t len;
+ char *cp, *line = NULL;
+ bool in_stanza = false;
+ int authtype = AIX_AUTH_UNKNOWN;
+ FILE *fp;
+ debug_decl(sudo_aix_authtype, SUDOERS_DEBUG_AUTH);
+
+ if ((fp = fopen("/etc/security/login.cfg", "r")) == NULL)
+ debug_return_int(AIX_AUTH_UNKNOWN);
+
+ while ((len = getdelim(&line, &linesize, '\n', fp)) != -1) {
+ /* First remove comments. */
+ if ((cp = strchr(line, '#')) != NULL) {
+ *cp = '\0';
+ len = (ssize_t)(cp - line);
+ }
+
+ /* Next remove trailing newlines and whitespace. */
+ while (len > 0 && isspace((unsigned char)line[len - 1]))
+ line[--len] = '\0';
+
+ /* Skip blank lines. */
+ if (len == 0)
+ continue;
+
+ /* Match start of the usw stanza. */
+ if (!in_stanza) {
+ if (strncmp(line, "usw:", 4) == 0)
+ in_stanza = true;
+ continue;
+ }
+
+ /* Check for end of the usw stanza. */
+ if (!isblank((unsigned char)line[0])) {
+ in_stanza = false;
+ break;
+ }
+
+ /* Skip leading blanks. */
+ cp = line;
+ do {
+ cp++;
+ } while (isblank((unsigned char)*cp));
+
+ /* Match "auth_type = (PAM_AUTH|STD_AUTH)". */
+ if (strncmp(cp, "auth_type", 9) != 0)
+ continue;
+ cp += 9;
+ while (isblank((unsigned char)*cp))
+ cp++;
+ if (*cp++ != '=')
+ continue;
+ while (isblank((unsigned char)*cp))
+ cp++;
+ if (strcmp(cp, "PAM_AUTH") == 0) {
+ authtype = AIX_AUTH_PAM;
+ break;
+ }
+ if (strcmp(cp, "STD_AUTH") == 0) {
+ authtype = AIX_AUTH_STD;
+ break;
+ }
+ }
+ free(line);
+ fclose(fp);
+
+ debug_return_int(authtype);
+}
+#endif /* HAVE_PAM */
+
+int
+sudo_aix_init(struct passwd *pw, sudo_auth *auth)
+{
+ debug_decl(sudo_aix_init, SUDOERS_DEBUG_AUTH);
+
+#ifdef HAVE_PAM
+ /* Check auth_type in /etc/security/login.cfg. */
+ if (sudo_aix_authtype() == AIX_AUTH_PAM) {
+ if (sudo_pam_init_quiet(pw, auth) == AUTH_SUCCESS) {
+ /* Fail AIX authentication so we can use PAM instead. */
+ debug_return_int(AUTH_FAILURE);
+ }
+ }
+#endif
+ debug_return_int(AUTH_SUCCESS);
+}
+
+/* Ignore AIX password incorrect message */
+static bool
+sudo_aix_valid_message(const char *message)
+{
+ const char *cp;
+ const char badpass_msgid[] = "3004-300";
+ debug_decl(sudo_aix_valid_message, SUDOERS_DEBUG_AUTH);
+
+ if (message == NULL || message[0] == '\0')
+ debug_return_bool(false);
+
+ /* Match "3004-300: You entered an invalid login name or password" */
+ for (cp = message; *cp != '\0'; cp++) {
+ if (isdigit((unsigned char)*cp)) {
+ if (strncmp(cp, badpass_msgid, strlen(badpass_msgid)) == 0)
+ debug_return_bool(false);
+ break;
+ }
+ }
+ debug_return_bool(true);
+}
+
+/*
+ * Change the user's password. If root changes the user's password
+ * the ADMCHG flag is set on the account (and the user must change
+ * it again) so we run passwd(1) as the user. This does mean that
+ * the user will need to re-enter their original password again,
+ * unlike with su(1). We may consider using pwdadm(1) as root to
+ * change the password and then clear the flag in the future.
+ */
+static bool
+sudo_aix_change_password(const char *user)
+{
+ struct sigaction sa, savechld;
+ pid_t child, pid;
+ bool ret = false;
+ sigset_t mask;
+ int status;
+ debug_decl(sudo_aix_change_password, SUDOERS_DEBUG_AUTH);
+
+ /* Set SIGCHLD handler to default since we call waitpid() below. */
+ memset(&sa, 0, sizeof(sa));
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = SA_RESTART;
+ sa.sa_handler = SIG_DFL;
+ (void) sigaction(SIGCHLD, &sa, &savechld);
+
+ switch (child = sudo_debug_fork()) {
+ case -1:
+ /* error */
+ sudo_warn("%s", U_("unable to fork"));
+ break;
+ case 0:
+ /* child, run passwd(1) */
+ sigemptyset(&mask);
+ sigaddset(&mask, SIGINT);
+ sigaddset(&mask, SIGQUIT);
+ (void) sigprocmask(SIG_UNBLOCK, &mask, NULL);
+ set_perms(PERM_USER);
+ execl("/usr/bin/passwd", "passwd", user, (char *)NULL);
+ sudo_warn("passwd");
+ _exit(127);
+ /* NOTREACHED */
+ default:
+ /* parent */
+ break;
+ }
+
+ /* Wait for passwd(1) to complete. */
+ do {
+ pid = waitpid(child, &status, 0);
+ } while (pid == -1 && errno == EINTR);
+ sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
+ "child (%d) exit value %d", (int)child, status);
+ if (pid != -1 && WIFEXITED(status) && WEXITSTATUS(status) == 0)
+ ret = true;
+
+ /* Restore saved SIGCHLD handler. */
+ (void) sigaction(SIGCHLD, &savechld, NULL);
+
+ debug_return_bool(ret);
+}
+
+int
+sudo_aix_verify(struct passwd *pw, const char *prompt, sudo_auth *auth, struct sudo_conv_callback *callback)
+{
+ char *pass, *message = NULL;
+ int result = 1, reenter = 0;
+ int ret = AUTH_SUCCESS;
+ debug_decl(sudo_aix_verify, SUDOERS_DEBUG_AUTH);
+
+ if (IS_NONINTERACTIVE(auth))
+ debug_return_int(AUTH_NONINTERACTIVE);
+
+ do {
+ pass = auth_getpass(prompt, SUDO_CONV_PROMPT_ECHO_OFF, callback);
+ if (pass == NULL)
+ break;
+ free(message);
+ message = NULL;
+ result = authenticate(pw->pw_name, pass, &reenter, &message);
+ freezero(pass, strlen(pass));
+ prompt = message;
+ } while (reenter);
+
+ if (result != 0) {
+ /* Display error message, if any. */
+ if (sudo_aix_valid_message(message))
+ sudo_printf(SUDO_CONV_ERROR_MSG|SUDO_CONV_PREFER_TTY,
+ "%s", message);
+ ret = pass ? AUTH_FAILURE : AUTH_INTR;
+ }
+ free(message);
+ message = NULL;
+
+ /* Check if password expired and allow user to change it if possible. */
+ if (ret == AUTH_SUCCESS) {
+ result = passwdexpired(pw->pw_name, &message);
+ if (message != NULL && message[0] != '\0') {
+ int msg_type = SUDO_CONV_PREFER_TTY;
+ msg_type |= result ? SUDO_CONV_ERROR_MSG : SUDO_CONV_INFO_MSG,
+ sudo_printf(msg_type, "%s", message);
+ free(message);
+ message = NULL;
+ }
+ switch (result) {
+ case 0:
+ /* password not expired. */
+ break;
+ case 1:
+ /* password expired, user must change it */
+ if (!sudo_aix_change_password(pw->pw_name)) {
+ sudo_warnx(U_("unable to change password for %s"), pw->pw_name);
+ ret = AUTH_FATAL;
+ }
+ break;
+ case 2:
+ /* password expired, only admin can change it */
+ ret = AUTH_FATAL;
+ break;
+ default:
+ /* error (-1) */
+ sudo_warn("passwdexpired");
+ ret = AUTH_FATAL;
+ break;
+ }
+ }
+
+ debug_return_int(ret);
+}
+
+int
+sudo_aix_cleanup(struct passwd *pw, sudo_auth *auth, bool force)
+{
+ debug_decl(sudo_aix_cleanup, SUDOERS_DEBUG_AUTH);
+
+ /* Unset AUTHSTATE as it may not be correct for the runas user. */
+ if (sudo_unsetenv("AUTHSTATE") == -1)
+ debug_return_int(AUTH_FAILURE);
+
+ debug_return_int(AUTH_SUCCESS);
+}
+
+#endif /* HAVE_AIXAUTH */
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