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-rw-r--r--plugins/sudoers/auth/bsdauth.c205
1 files changed, 205 insertions, 0 deletions
diff --git a/plugins/sudoers/auth/bsdauth.c b/plugins/sudoers/auth/bsdauth.c
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+++ b/plugins/sudoers/auth/bsdauth.c
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+/*
+ * Copyright (c) 2000-2005, 2007-2008, 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>
+
+#ifdef HAVE_BSD_AUTH_H
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif /* HAVE_STRING_H */
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRING_H */
+#include <unistd.h>
+#include <ctype.h>
+#include <pwd.h>
+#include <signal.h>
+
+#include <login_cap.h>
+#include <bsd_auth.h>
+
+#include "sudoers.h"
+#include "sudo_auth.h"
+
+# ifndef LOGIN_DEFROOTCLASS
+# define LOGIN_DEFROOTCLASS "daemon"
+# endif
+
+struct bsdauth_state {
+ auth_session_t *as;
+ login_cap_t *lc;
+};
+
+int
+bsdauth_init(struct passwd *pw, sudo_auth *auth)
+{
+ static struct bsdauth_state state;
+ debug_decl(bsdauth_init, SUDOERS_DEBUG_AUTH)
+
+ /* Get login class based on auth user, which may not be invoking user. */
+ if (pw->pw_class && *pw->pw_class)
+ state.lc = login_getclass(pw->pw_class);
+ else
+ state.lc = login_getclass(pw->pw_uid ? LOGIN_DEFCLASS : LOGIN_DEFROOTCLASS);
+ if (state.lc == NULL) {
+ log_warning(0,
+ N_("unable to get login class for user %s"), pw->pw_name);
+ debug_return_int(AUTH_FATAL);
+ }
+
+ if ((state.as = auth_open()) == NULL) {
+ log_warning(0, N_("unable to begin bsd authentication"));
+ login_close(state.lc);
+ debug_return_int(AUTH_FATAL);
+ }
+
+ /* XXX - maybe sanity check the auth style earlier? */
+ login_style = login_getstyle(state.lc, login_style, "auth-sudo");
+ if (login_style == NULL) {
+ log_warningx(0, N_("invalid authentication type"));
+ auth_close(state.as);
+ login_close(state.lc);
+ debug_return_int(AUTH_FATAL);
+ }
+
+ if (auth_setitem(state.as, AUTHV_STYLE, login_style) < 0 ||
+ auth_setitem(state.as, AUTHV_NAME, pw->pw_name) < 0 ||
+ auth_setitem(state.as, AUTHV_CLASS, login_class) < 0) {
+ log_warningx(0, N_("unable to initialize BSD authentication"));
+ auth_close(state.as);
+ login_close(state.lc);
+ debug_return_int(AUTH_FATAL);
+ }
+
+ auth->data = (void *) &state;
+ debug_return_int(AUTH_SUCCESS);
+}
+
+int
+bsdauth_verify(struct passwd *pw, char *prompt, sudo_auth *auth, struct sudo_conv_callback *callback)
+{
+ char *pass;
+ char *s;
+ size_t len;
+ int authok = 0;
+ struct sigaction sa, osa;
+ auth_session_t *as = ((struct bsdauth_state *) auth->data)->as;
+ debug_decl(bsdauth_verify, SUDOERS_DEBUG_AUTH)
+
+ /* save old signal handler */
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = SA_RESTART;
+ sa.sa_handler = SIG_DFL;
+ (void) sigaction(SIGCHLD, &sa, &osa);
+
+ /*
+ * If there is a challenge then print that instead of the normal
+ * prompt. If the user just hits return we prompt again with echo
+ * turned on, which is useful for challenge/response things like
+ * S/Key.
+ */
+ if ((s = auth_challenge(as)) == NULL) {
+ pass = auth_getpass(prompt, SUDO_CONV_PROMPT_ECHO_OFF, callback);
+ } else {
+ pass = auth_getpass(s, SUDO_CONV_PROMPT_ECHO_OFF, callback);
+ if (pass && *pass == '\0') {
+ if ((prompt = strrchr(s, '\n')))
+ prompt++;
+ else
+ prompt = s;
+
+ /*
+ * Append '[echo on]' to the last line of the challenge and
+ * reprompt with echo turned on.
+ */
+ len = strlen(prompt) - 1;
+ while (isspace(prompt[len]) || prompt[len] == ':')
+ prompt[len--] = '\0';
+ if (asprintf(&s, "%s [echo on]: ", prompt) == -1) {
+ log_warningx(0, N_("unable to allocate memory"));
+ debug_return_int(AUTH_FATAL);
+ }
+ free(pass);
+ pass = auth_getpass(s, SUDO_CONV_PROMPT_ECHO_ON, callback);
+ free(s);
+ }
+ }
+
+ if (pass) {
+ authok = auth_userresponse(as, pass, 1);
+ memset_s(pass, SUDO_CONV_REPL_MAX, 0, strlen(pass));
+ free(pass);
+ }
+
+ /* restore old signal handler */
+ (void) sigaction(SIGCHLD, &osa, NULL);
+
+ if (authok)
+ debug_return_int(AUTH_SUCCESS);
+
+ if (!pass)
+ debug_return_int(AUTH_INTR);
+
+ if ((s = auth_getvalue(as, "errormsg")) != NULL)
+ log_warningx(0, "%s", s);
+ debug_return_int(AUTH_FAILURE);
+}
+
+int
+bsdauth_approval(struct passwd *pw, sudo_auth *auth, bool exempt)
+{
+ struct bsdauth_state *state = auth->data;
+ debug_decl(bsdauth_approval, SUDOERS_DEBUG_AUTH)
+
+ if (auth_approval(state->as, state->lc, pw->pw_name, "auth-sudo") == 0) {
+ if (auth_getstate(state->as) & AUTH_EXPIRED)
+ log_warningx(0, "%s", N_("your account has expired"));
+ else
+ log_warningx(0, "%s", N_("approval failed"));
+ debug_return_int(AUTH_FAILURE);
+ }
+ debug_return_int(AUTH_SUCCESS);
+}
+
+int
+bsdauth_cleanup(struct passwd *pw, sudo_auth *auth)
+{
+ struct bsdauth_state *state = auth->data;
+ debug_decl(bsdauth_cleanup, SUDOERS_DEBUG_AUTH)
+
+ if (state != NULL) {
+ auth_close(state->as);
+ login_close(state->lc);
+ }
+
+ debug_return_int(AUTH_SUCCESS);
+}
+
+#endif /* HAVE_BSD_AUTH_H */