Imported Upstream version 1.8.1p2

[debian/sudo] / plugins / sudoers / auth / bsdauth.c

diff --git a/plugins/sudoers/auth/bsdauth.c b/plugins/sudoers/auth/bsdauth.c
new file mode 100644 (file)
index 0000000..f70e424
--- /dev/null
+++ b/plugins/sudoers/auth/bsdauth.c
@@ -0,0 +1,161 @@
+/*
+ * Copyright (c) 2000-2005, 2007-2008, 2010-2011
+ *     Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * 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.
+ */
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <stdio.h>
+#ifdef STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#else
+# ifdef HAVE_STDLIB_H
+#  include <stdlib.h>
+# endif
+#endif /* STDC_HEADERS */
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif /* HAVE_STRING_H */
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRING_H */
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif /* HAVE_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"
+
+extern char *login_style;              /* from sudo.c */
+
+int
+bsdauth_init(struct passwd *pw, char **promptp, sudo_auth *auth)
+{
+    static auth_session_t *as;
+    extern login_cap_t *lc;                    /* from sudo.c */
+
+    if ((as = auth_open()) == NULL) {
+       log_error(USE_ERRNO|NO_EXIT|NO_MAIL,
+           "unable to begin bsd authentication");
+       return AUTH_FATAL;
+    }
+
+    /* XXX - maybe sanity check the auth style earlier? */
+    login_style = login_getstyle(lc, login_style, "auth-sudo");
+    if (login_style == NULL) {
+       log_error(NO_EXIT|NO_MAIL, "invalid authentication type");
+       auth_close(as);
+       return AUTH_FATAL;
+    }
+
+     if (auth_setitem(as, AUTHV_STYLE, login_style) < 0 ||
+       auth_setitem(as, AUTHV_NAME, pw->pw_name) < 0 ||
+       auth_setitem(as, AUTHV_CLASS, login_class) < 0) {
+       log_error(NO_EXIT|NO_MAIL, "unable to setup authentication");
+       auth_close(as);
+       return AUTH_FATAL;
+    }
+
+    auth->data = (void *) as;
+    return AUTH_SUCCESS;
+}
+
+int
+bsdauth_verify(struct passwd *pw, char *prompt, sudo_auth *auth)
+{
+    char *pass;
+    char *s;
+    size_t len;
+    int authok = 0;
+    sigaction_t sa, osa;
+    auth_session_t *as = (auth_session_t *) auth->data;
+
+    /* 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, def_passwd_timeout * 60, SUDO_CONV_PROMPT_ECHO_OFF);
+    } else {
+       pass = auth_getpass(prompt, def_passwd_timeout * 60, SUDO_CONV_PROMPT_ECHO_OFF);
+       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';
+           easprintf(&s, "%s [echo on]: ", prompt);
+           pass = auth_getpass(prompt, def_passwd_timeout * 60,
+               SUDO_CONV_PROMPT_ECHO_ON);
+           free(s);
+       }
+    }
+
+    if (pass) {
+       authok = auth_userresponse(as, pass, 1);
+       zero_bytes(pass, strlen(pass));
+    }
+
+    /* restore old signal handler */
+    (void) sigaction(SIGCHLD, &osa, NULL);
+
+    if (authok)
+       return AUTH_SUCCESS;
+
+    if (!pass)
+       return AUTH_INTR;
+
+    if ((s = auth_getvalue(as, "errormsg")) != NULL)
+       log_error(NO_EXIT|NO_MAIL, "%s", s);
+    return AUTH_FAILURE;
+}
+
+int
+bsdauth_cleanup(struct passwd *pw, sudo_auth *auth)
+{
+    auth_session_t *as = (auth_session_t *) auth->data;
+
+    auth_close(as);
+
+    return AUTH_SUCCESS;
+}