Imported Upstream version 1.8.1p2

[debian/sudo] / plugins / sudoers / auth / kerb4.c

diff --git a/plugins/sudoers/auth/kerb4.c b/plugins/sudoers/auth/kerb4.c
new file mode 100644 (file)
index 0000000..176d6a7
--- /dev/null
+++ b/plugins/sudoers/auth/kerb4.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 1999-2005, 2007, 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 <pwd.h>
+#include <krb.h>
+
+#include "sudoers.h"
+#include "sudo_auth.h"
+
+int
+kerb4_init(struct passwd *pw, char **promptp, sudo_auth *auth)
+{
+    static char realm[REALM_SZ];
+
+    /* Don't try to verify root */
+    if (pw->pw_uid == 0)
+       return AUTH_FAILURE;
+
+    /* Get the local realm, or retrun failure (no krb.conf) */
+    if (krb_get_lrealm(realm, 1) != KSUCCESS)
+       return AUTH_FAILURE;
+
+    /* Stash a pointer to the realm (used in kerb4_verify) */
+    auth->data = (void *) realm;
+
+    return AUTH_SUCCESS;
+}
+
+int
+kerb4_verify(struct passwd *pw, char *pass, sudo_auth *auth)
+{
+    char tkfile[sizeof(_PATH_SUDO_TIMEDIR) + 4 + MAX_UID_T_LEN];
+    char *realm = (char *) auth->data;
+    int error;
+
+    /*
+     * Set the ticket file to be in sudo sudo timedir so we don't
+     * wipe out other (real) kerberos tickets.
+     */
+    (void) snprintf(tkfile, sizeof(tkfile), "%s/tkt%u",
+       _PATH_SUDO_TIMEDIR, (unsigned int) pw->pw_uid);
+    (void) krb_set_tkt_string(tkfile);
+
+    /* Convert the password to a ticket given. */
+    error = krb_get_pw_in_tkt(pw->pw_name, "", realm, "krbtgt", realm,
+       DEFAULT_TKT_LIFE, pass);
+
+    switch (error) {
+       case INTK_OK:
+           dest_tkt();                 /* we are done with the temp ticket */
+           return AUTH_SUCCESS;
+           break;
+       case INTK_BADPW:
+       case KDC_PR_UNKNOWN:
+           break;
+       default:
+           (void) fprintf(stderr, "Warning: Kerberos error: %s\n",
+               krb_err_txt[error]);
+    }
+
+    return AUTH_FAILURE;
+}