Adding upstream version 1.9.15p5.upstream/1.9.15p5upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 224 insertions, 0 deletions

diff --git a/plugins/sudoers/auth/bsdauth.c b/plugins/sudoers/auth/bsdauth.c
new file mode 100644
index 0000000..d48148c
--- /dev/null
+++ b/plugins/sudoers/auth/bsdauth.c
@@ -0,0 +1,224 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * 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>
+#include <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;
+};
+
+static char *login_style;	/* user may set style via -a option */
+
+int
+bsdauth_init(const struct sudoers_context *ctx, struct passwd *pw,
+    sudo_auth *auth)
+{
+    static struct bsdauth_state state;
+    debug_decl(bsdauth_init, SUDOERS_DEBUG_AUTH);
+
+    /* Only initialize once. */
+    if (auth->data != NULL)
+	debug_return_int(AUTH_SUCCESS);
+
+    /* 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 ? (char *)LOGIN_DEFCLASS : (char *)LOGIN_DEFROOTCLASS);
+    }
+    if (state.lc == NULL) {
+	log_warning(ctx, 0, N_("unable to get login class for user %s"),
+	    pw->pw_name);
+	goto bad;
+    }
+
+    login_style = login_getstyle(state.lc, login_style, (char *)"auth-sudo");
+    if (login_style == NULL) {
+	log_warningx(ctx, 0, N_("invalid authentication type"));
+	goto bad;
+    }
+
+    if ((state.as = auth_open()) == NULL) {
+	log_warning(ctx, 0, N_("unable to begin BSD authentication"));
+	goto bad;
+    }
+
+    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, ctx->runas.class) < 0) {
+	log_warningx(ctx, 0, N_("unable to initialize BSD authentication"));
+	goto bad;
+    }
+
+    auth->data = (void *) &state;
+    debug_return_int(AUTH_SUCCESS);
+bad:
+    auth_close(state.as);
+    login_close(state.lc);
+    debug_return_int(AUTH_ERROR);
+}
+
+int
+bsdauth_verify(const struct sudoers_context *ctx, struct passwd *pw,
+    const 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);
+
+    if (IS_NONINTERACTIVE(auth))
+        debug_return_int(AUTH_NONINTERACTIVE);
+
+    /* 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 != NULL && *pass == '\0') {
+	    if ((prompt = strrchr(s, '\n')))
+		prompt++;
+	    else
+		prompt = s;
+
+	    /*
+	     * Append '[echo on]' to the last line of the challenge and
+	     * re-prompt with echo turned on.
+	     */
+	    len = strlen(prompt);
+	    while (len > 0 && (isspace((unsigned char)prompt[len - 1]) || prompt[len - 1] == ':'))
+		len--;
+	    if (asprintf(&s, "%.*s [echo on]: ", (int)len, prompt) == -1) {
+		log_warningx(ctx, 0, N_("unable to allocate memory"));
+		debug_return_int(AUTH_ERROR);
+	    }
+	    free(pass);
+	    pass = auth_getpass(s, SUDO_CONV_PROMPT_ECHO_ON, callback);
+	    free(s);
+	}
+    }
+
+    if (pass != NULL) {
+	authok = auth_userresponse(as, pass, 1);
+	freezero(pass, strlen(pass));
+    }
+
+    /* restore old signal handler */
+    (void) sigaction(SIGCHLD, &osa, NULL);
+
+    if (authok)
+	debug_return_int(AUTH_SUCCESS);
+
+    if (pass == NULL)
+	debug_return_int(AUTH_INTR);
+
+    if ((s = auth_getvalue(as, (char *)"errormsg")) != NULL)
+	log_warningx(ctx, 0, "%s", s);
+    debug_return_int(AUTH_FAILURE);
+}
+
+int
+bsdauth_approval(const struct sudoers_context *ctx, 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, (char *)"auth-sudo") == 0) {
+	if (auth_getstate(state->as) & AUTH_EXPIRED)
+	    log_warningx(ctx, 0, "%s", N_("your account has expired"));
+	else
+	    log_warningx(ctx, 0, "%s", N_("approval failed"));
+	debug_return_int(AUTH_FAILURE);
+    }
+    debug_return_int(AUTH_SUCCESS);
+}
+
+int
+bsdauth_cleanup(const struct sudoers_context *ctx, struct passwd *pw,
+    sudo_auth *auth, bool force)
+{
+    struct bsdauth_state *state = auth->data;
+    debug_decl(bsdauth_cleanup, SUDOERS_DEBUG_AUTH);
+
+    if (state != NULL) {
+	auth_close(state->as);
+	state->as = NULL;
+	login_close(state->lc);
+	state->lc = NULL;
+	auth->data = NULL;
+    }
+    login_style = NULL;
+
+    debug_return_int(AUTH_SUCCESS);
+}
+
+void
+bsdauth_set_style(const char *style)
+{
+    login_style = (char *)style;
+}
+
+#endif /* HAVE_BSD_AUTH_H */