summaryrefslogtreecommitdiffstats
path: root/appl/telnet/libtelnet/kerberos5.c
diff options
context:
space:
mode:
Diffstat (limited to 'appl/telnet/libtelnet/kerberos5.c')
-rw-r--r--appl/telnet/libtelnet/kerberos5.c895
1 files changed, 895 insertions, 0 deletions
diff --git a/appl/telnet/libtelnet/kerberos5.c b/appl/telnet/libtelnet/kerberos5.c
new file mode 100644
index 0000000..cac80d0
--- /dev/null
+++ b/appl/telnet/libtelnet/kerberos5.c
@@ -0,0 +1,895 @@
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Copyright (C) 1990 by the Massachusetts Institute of Technology
+ *
+ * Export of this software from the United States of America may
+ * require a specific license from the United States Government.
+ * It is the responsibility of any person or organization contemplating
+ * export to obtain such a license before exporting.
+ *
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of M.I.T. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission. M.I.T. makes no representations about the suitability of
+ * this software for any purpose. It is provided "as is" without express
+ * or implied warranty.
+ */
+
+#include <config.h>
+
+RCSID("$Id: kerberos5.c 22071 2007-11-14 20:04:50Z lha $");
+
+#ifdef KRB5
+
+#include <arpa/telnet.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <netdb.h>
+#include <ctype.h>
+#include <pwd.h>
+#define Authenticator k5_Authenticator
+#include <krb5.h>
+#undef Authenticator
+#include <roken.h>
+#ifdef SOCKS
+#include <socks.h>
+#endif
+
+
+#include "encrypt.h"
+#include "auth.h"
+#include "misc.h"
+
+#if defined(DCE)
+int dfsk5ok = 0;
+int dfspag = 0;
+int dfsfwd = 0;
+#endif
+
+int forward_flags = 0; /* Flags get set in telnet/main.c on -f and -F */
+
+int forward(int);
+int forwardable(int);
+
+/* These values need to be the same as those defined in telnet/main.c. */
+/* Either define them in both places, or put in some common header file. */
+#define OPTS_FORWARD_CREDS 0x00000002
+#define OPTS_FORWARDABLE_CREDS 0x00000001
+
+
+void kerberos5_forward (Authenticator *);
+
+static unsigned char str_data[4] = { IAC, SB, TELOPT_AUTHENTICATION, 0 };
+
+#define KRB_AUTH 0 /* Authentication data follows */
+#define KRB_REJECT 1 /* Rejected (reason might follow) */
+#define KRB_ACCEPT 2 /* Accepted */
+#define KRB_RESPONSE 3 /* Response for mutual auth. */
+
+#define KRB_FORWARD 4 /* Forwarded credentials follow */
+#define KRB_FORWARD_ACCEPT 5 /* Forwarded credentials accepted */
+#define KRB_FORWARD_REJECT 6 /* Forwarded credentials rejected */
+
+static krb5_data auth;
+static krb5_ticket *ticket;
+
+static krb5_context context;
+static krb5_auth_context auth_context;
+
+static int
+Data(Authenticator *ap, int type, const void *d, int c)
+{
+ const unsigned char *cp, *cd = d;
+ unsigned char *p0, *p;
+ size_t len = sizeof(str_data) + 3 + 2;
+ int ret;
+
+ if (c == -1)
+ c = strlen((const char*)cd);
+
+ for (cp = cd; cp - cd < c; cp++, len++)
+ if (*cp == IAC)
+ len++;
+
+ p0 = malloc(len);
+ if (p0 == NULL)
+ return 0;
+
+ memcpy(p0, str_data, sizeof(str_data));
+ p = p0 + sizeof(str_data);
+
+ if (auth_debug_mode) {
+ printf("%s:%d: [%d] (%d)",
+ str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY",
+ str_data[3],
+ type, c);
+ printd(d, c);
+ printf("\r\n");
+ }
+ *p++ = ap->type;
+ *p++ = ap->way;
+ *p++ = type;
+ while (c-- > 0) {
+ if ((*p++ = *cd++) == IAC)
+ *p++ = IAC;
+ }
+ *p++ = IAC;
+ *p++ = SE;
+ if (str_data[3] == TELQUAL_IS)
+ printsub('>', &p0[2], len - 2);
+ ret = telnet_net_write(p0, len);
+ free(p0);
+ return ret;
+}
+
+int
+kerberos5_init(Authenticator *ap, int server)
+{
+ krb5_error_code ret;
+
+ ret = krb5_init_context(&context);
+ if (ret)
+ return 0;
+ if (server) {
+ krb5_keytab kt;
+ krb5_kt_cursor cursor;
+
+ ret = krb5_kt_default(context, &kt);
+ if (ret)
+ return 0;
+
+ ret = krb5_kt_start_seq_get (context, kt, &cursor);
+ if (ret) {
+ krb5_kt_close (context, kt);
+ return 0;
+ }
+ krb5_kt_end_seq_get (context, kt, &cursor);
+ krb5_kt_close (context, kt);
+
+ str_data[3] = TELQUAL_REPLY;
+ } else
+ str_data[3] = TELQUAL_IS;
+ return(1);
+}
+
+extern int net;
+static int
+kerberos5_send(char *name, Authenticator *ap)
+{
+ krb5_error_code ret;
+ krb5_ccache ccache;
+ int ap_opts;
+ krb5_data cksum_data;
+ char ap_msg[2];
+
+ if (!UserNameRequested) {
+ if (auth_debug_mode) {
+ printf("Kerberos V5: no user name supplied\r\n");
+ }
+ return(0);
+ }
+
+ ret = krb5_cc_default(context, &ccache);
+ if (ret) {
+ if (auth_debug_mode) {
+ printf("Kerberos V5: could not get default ccache: %s\r\n",
+ krb5_get_err_text (context, ret));
+ }
+ return 0;
+ }
+
+ if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL)
+ ap_opts = AP_OPTS_MUTUAL_REQUIRED;
+ else
+ ap_opts = 0;
+
+ ap_opts |= AP_OPTS_USE_SUBKEY;
+
+ ret = krb5_auth_con_init (context, &auth_context);
+ if (ret) {
+ if (auth_debug_mode) {
+ printf("Kerberos V5: krb5_auth_con_init failed (%s)\r\n",
+ krb5_get_err_text(context, ret));
+ }
+ return(0);
+ }
+
+ ret = krb5_auth_con_setaddrs_from_fd (context,
+ auth_context,
+ &net);
+ if (ret) {
+ if (auth_debug_mode) {
+ printf ("Kerberos V5:"
+ " krb5_auth_con_setaddrs_from_fd failed (%s)\r\n",
+ krb5_get_err_text(context, ret));
+ }
+ return(0);
+ }
+
+ krb5_auth_con_setkeytype (context, auth_context, KEYTYPE_DES);
+
+ ap_msg[0] = ap->type;
+ ap_msg[1] = ap->way;
+
+ cksum_data.length = sizeof(ap_msg);
+ cksum_data.data = ap_msg;
+
+
+ {
+ krb5_principal service;
+ char sname[128];
+
+
+ ret = krb5_sname_to_principal (context,
+ RemoteHostName,
+ NULL,
+ KRB5_NT_SRV_HST,
+ &service);
+ if(ret) {
+ if (auth_debug_mode) {
+ printf ("Kerberos V5:"
+ " krb5_sname_to_principal(%s) failed (%s)\r\n",
+ RemoteHostName, krb5_get_err_text(context, ret));
+ }
+ return 0;
+ }
+ ret = krb5_unparse_name_fixed(context, service, sname, sizeof(sname));
+ if(ret) {
+ if (auth_debug_mode) {
+ printf ("Kerberos V5:"
+ " krb5_unparse_name_fixed failed (%s)\r\n",
+ krb5_get_err_text(context, ret));
+ }
+ return 0;
+ }
+ printf("[ Trying %s (%s)... ]\r\n", name, sname);
+ ret = krb5_mk_req_exact(context, &auth_context, ap_opts,
+ service,
+ &cksum_data, ccache, &auth);
+ krb5_free_principal (context, service);
+
+ }
+ if (ret) {
+ if (1 || auth_debug_mode) {
+ printf("Kerberos V5: mk_req failed (%s)\r\n",
+ krb5_get_err_text(context, ret));
+ }
+ return(0);
+ }
+
+ if (!auth_sendname((unsigned char *)UserNameRequested,
+ strlen(UserNameRequested))) {
+ if (auth_debug_mode)
+ printf("Not enough room for user name\r\n");
+ return(0);
+ }
+ if (!Data(ap, KRB_AUTH, auth.data, auth.length)) {
+ if (auth_debug_mode)
+ printf("Not enough room for authentication data\r\n");
+ return(0);
+ }
+ if (auth_debug_mode) {
+ printf("Sent Kerberos V5 credentials to server\r\n");
+ }
+ return(1);
+}
+
+int
+kerberos5_send_mutual(Authenticator *ap)
+{
+ return kerberos5_send("mutual KERBEROS5", ap);
+}
+
+int
+kerberos5_send_oneway(Authenticator *ap)
+{
+ return kerberos5_send("KERBEROS5", ap);
+}
+
+static void log_message(const char *fmt, ...)
+{
+ va_list ap;
+ va_start(ap, fmt);
+ if (auth_debug_mode) {
+ va_start(ap, fmt);
+ vfprintf(stdout, fmt, ap);
+ va_end(ap);
+ fprintf(stdout, "\r\n");
+ }
+ va_start(ap, fmt);
+ vsyslog(LOG_NOTICE, fmt, ap);
+ va_end(ap);
+}
+
+void
+kerberos5_is(Authenticator *ap, unsigned char *data, int cnt)
+{
+ krb5_error_code ret;
+ krb5_data outbuf;
+ krb5_keyblock *key_block;
+ char *name;
+ krb5_principal server;
+ int zero = 0;
+
+ if (cnt-- < 1)
+ return;
+ switch (*data++) {
+ case KRB_AUTH:
+ auth.data = (char *)data;
+ auth.length = cnt;
+
+ auth_context = NULL;
+
+ ret = krb5_auth_con_init (context, &auth_context);
+ if (ret) {
+ Data(ap, KRB_REJECT, "krb5_auth_con_init failed", -1);
+ auth_finished(ap, AUTH_REJECT);
+ log_message("Kerberos V5: krb5_auth_con_init failed (%s)",
+ krb5_get_err_text(context, ret));
+ return;
+ }
+
+ ret = krb5_auth_con_setaddrs_from_fd (context,
+ auth_context,
+ &zero);
+ if (ret) {
+ Data(ap, KRB_REJECT, "krb5_auth_con_setaddrs_from_fd failed", -1);
+ auth_finished(ap, AUTH_REJECT);
+ log_message("Kerberos V5: "
+ "krb5_auth_con_setaddrs_from_fd failed (%s)",
+ krb5_get_err_text(context, ret));
+ return;
+ }
+
+ ret = krb5_sock_to_principal (context,
+ 0,
+ "host",
+ KRB5_NT_SRV_HST,
+ &server);
+ if (ret) {
+ Data(ap, KRB_REJECT, "krb5_sock_to_principal failed", -1);
+ auth_finished(ap, AUTH_REJECT);
+ log_message("Kerberos V5: "
+ "krb5_sock_to_principal failed (%s)",
+ krb5_get_err_text(context, ret));
+ return;
+ }
+
+ ret = krb5_rd_req(context,
+ &auth_context,
+ &auth,
+ server,
+ NULL,
+ NULL,
+ &ticket);
+
+ krb5_free_principal (context, server);
+ if (ret) {
+ const char *errbuf2 = "Read req failed";
+ char *errbuf;
+ int ret2;
+
+ ret2 = asprintf(&errbuf,
+ "Read req failed: %s",
+ krb5_get_err_text(context, ret));
+ if (ret2 != -1)
+ errbuf2 = errbuf;
+ Data(ap, KRB_REJECT, errbuf2, -1);
+ log_message("%s", errbuf2);
+ if (ret2 != -1)
+ free (errbuf);
+ return;
+ }
+
+ {
+ char ap_msg[2];
+
+ ap_msg[0] = ap->type;
+ ap_msg[1] = ap->way;
+
+ ret = krb5_verify_authenticator_checksum(context,
+ auth_context,
+ ap_msg,
+ sizeof(ap_msg));
+
+ if (ret) {
+ const char *errbuf2 = "Bad checksum";
+ char *errbuf;
+ int ret2;
+
+ ret2 = asprintf(&errbuf, "Bad checksum: %s",
+ krb5_get_err_text(context, ret));
+ if (ret2 != -1)
+ errbuf2 = errbuf;
+ Data(ap, KRB_REJECT, errbuf2, -1);
+ log_message("%s", errbuf2);
+ if (ret2 != -1)
+ free(errbuf);
+ return;
+ }
+ }
+ ret = krb5_auth_con_getremotesubkey (context,
+ auth_context,
+ &key_block);
+
+ if (ret) {
+ Data(ap, KRB_REJECT, "krb5_auth_con_getremotesubkey failed", -1);
+ auth_finished(ap, AUTH_REJECT);
+ log_message("Kerberos V5: "
+ "krb5_auth_con_getremotesubkey failed (%s)",
+ krb5_get_err_text(context, ret));
+ return;
+ }
+
+ if (key_block == NULL) {
+ ret = krb5_auth_con_getkey(context,
+ auth_context,
+ &key_block);
+ }
+ if (ret) {
+ Data(ap, KRB_REJECT, "krb5_auth_con_getkey failed", -1);
+ auth_finished(ap, AUTH_REJECT);
+ log_message("Kerberos V5: "
+ "krb5_auth_con_getkey failed (%s)",
+ krb5_get_err_text(context, ret));
+ return;
+ }
+ if (key_block == NULL) {
+ Data(ap, KRB_REJECT, "no subkey received", -1);
+ auth_finished(ap, AUTH_REJECT);
+ log_message("Kerberos V5: "
+ "krb5_auth_con_getremotesubkey returned NULL key");
+ return;
+ }
+
+ if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) {
+ ret = krb5_mk_rep(context, auth_context, &outbuf);
+ if (ret) {
+ Data(ap, KRB_REJECT,
+ "krb5_mk_rep failed", -1);
+ auth_finished(ap, AUTH_REJECT);
+ log_message("Kerberos V5: "
+ "krb5_mk_rep failed (%s)",
+ krb5_get_err_text(context, ret));
+ return;
+ }
+ Data(ap, KRB_RESPONSE, outbuf.data, outbuf.length);
+ }
+ if (krb5_unparse_name(context, ticket->client, &name))
+ name = 0;
+
+ if(UserNameRequested && krb5_kuserok(context,
+ ticket->client,
+ UserNameRequested)) {
+ Data(ap, KRB_ACCEPT, name, name ? -1 : 0);
+ log_message("%s accepted as user %s from %s",
+ name ? name : "<unknown>",
+ UserNameRequested ? UserNameRequested : "<unknown>",
+ RemoteHostName ? RemoteHostName : "<unknown>");
+
+ if(key_block->keytype == ETYPE_DES_CBC_MD5 ||
+ key_block->keytype == ETYPE_DES_CBC_MD4 ||
+ key_block->keytype == ETYPE_DES_CBC_CRC) {
+ Session_Key skey;
+
+ skey.type = SK_DES;
+ skey.length = 8;
+ skey.data = key_block->keyvalue.data;
+ encrypt_session_key(&skey, 0);
+ }
+
+ } else {
+ const char *msg2 = "user is not authorized to login";
+ char *msg;
+
+ ret = asprintf (&msg, "user `%s' is not authorized to "
+ "login as `%s'",
+ name ? name : "<unknown>",
+ UserNameRequested ? UserNameRequested : "<nobody>");
+ if (ret != -1)
+ msg2 = msg;
+ Data(ap, KRB_REJECT, (void *)msg2, -1);
+ if (ret != -1)
+ free(msg);
+ auth_finished (ap, AUTH_REJECT);
+ krb5_free_keyblock_contents(context, key_block);
+ break;
+ }
+ auth_finished(ap, AUTH_USER);
+ krb5_free_keyblock_contents(context, key_block);
+
+ break;
+ case KRB_FORWARD: {
+ struct passwd *pwd;
+ char ccname[1024]; /* XXX */
+ krb5_data inbuf;
+ krb5_ccache ccache;
+ inbuf.data = (char *)data;
+ inbuf.length = cnt;
+
+ pwd = getpwnam (UserNameRequested);
+ if (pwd == NULL)
+ break;
+
+ snprintf (ccname, sizeof(ccname),
+ "FILE:/tmp/krb5cc_%lu", (unsigned long)pwd->pw_uid);
+
+ ret = krb5_cc_resolve (context, ccname, &ccache);
+ if (ret) {
+ log_message("Kerberos V5: could not get ccache: %s",
+ krb5_get_err_text(context, ret));
+ break;
+ }
+
+ ret = krb5_cc_initialize (context,
+ ccache,
+ ticket->client);
+ if (ret) {
+ log_message("Kerberos V5: could not init ccache: %s",
+ krb5_get_err_text(context, ret));
+ break;
+ }
+
+#if defined(DCE)
+ esetenv("KRB5CCNAME", ccname, 1);
+#endif
+ ret = krb5_rd_cred2 (context,
+ auth_context,
+ ccache,
+ &inbuf);
+ if(ret) {
+ const char *errbuf2 = "Read forwarded creds failed";
+ char *errbuf;
+ int ret2;
+
+ ret2 = asprintf (&errbuf,
+ "Read forwarded creds failed: %s",
+ krb5_get_err_text (context, ret));
+ if (ret2 != -1)
+ errbuf2 = errbuf;
+ Data(ap, KRB_FORWARD_REJECT, errbuf, -1);
+ log_message("Could not read forwarded credentials: %s", errbuf);
+
+ if (ret2 != -1)
+ free (errbuf);
+ } else {
+ Data(ap, KRB_FORWARD_ACCEPT, 0, 0);
+#if defined(DCE)
+ dfsfwd = 1;
+#endif
+ }
+ chown (ccname + 5, pwd->pw_uid, -1);
+ log_message("Forwarded credentials obtained");
+ break;
+ }
+ default:
+ log_message("Unknown Kerberos option %d", data[-1]);
+ Data(ap, KRB_REJECT, 0, 0);
+ break;
+ }
+}
+
+void
+kerberos5_reply(Authenticator *ap, unsigned char *data, int cnt)
+{
+ static int mutual_complete = 0;
+
+ if (cnt-- < 1)
+ return;
+ switch (*data++) {
+ case KRB_REJECT:
+ if (cnt > 0) {
+ printf("[ Kerberos V5 refuses authentication because %.*s ]\r\n",
+ cnt, data);
+ } else
+ printf("[ Kerberos V5 refuses authentication ]\r\n");
+ auth_send_retry();
+ return;
+ case KRB_ACCEPT: {
+ krb5_error_code ret;
+ Session_Key skey;
+ krb5_keyblock *keyblock;
+
+ if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL &&
+ !mutual_complete) {
+ printf("[ Kerberos V5 accepted you, but didn't provide mutual authentication! ]\r\n");
+ auth_send_retry();
+ return;
+ }
+ if (cnt)
+ printf("[ Kerberos V5 accepts you as ``%.*s'' ]\r\n", cnt, data);
+ else
+ printf("[ Kerberos V5 accepts you ]\r\n");
+
+ ret = krb5_auth_con_getlocalsubkey (context,
+ auth_context,
+ &keyblock);
+ if (ret)
+ ret = krb5_auth_con_getkey (context,
+ auth_context,
+ &keyblock);
+ if(ret) {
+ printf("[ krb5_auth_con_getkey: %s ]\r\n",
+ krb5_get_err_text(context, ret));
+ auth_send_retry();
+ return;
+ }
+
+ skey.type = SK_DES;
+ skey.length = 8;
+ skey.data = keyblock->keyvalue.data;
+ encrypt_session_key(&skey, 0);
+ krb5_free_keyblock_contents (context, keyblock);
+ auth_finished(ap, AUTH_USER);
+ if (forward_flags & OPTS_FORWARD_CREDS)
+ kerberos5_forward(ap);
+ break;
+ }
+ case KRB_RESPONSE:
+ if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) {
+ /* the rest of the reply should contain a krb_ap_rep */
+ krb5_ap_rep_enc_part *reply;
+ krb5_data inbuf;
+ krb5_error_code ret;
+
+ inbuf.length = cnt;
+ inbuf.data = (char *)data;
+
+ ret = krb5_rd_rep(context, auth_context, &inbuf, &reply);
+ if (ret) {
+ printf("[ Mutual authentication failed: %s ]\r\n",
+ krb5_get_err_text (context, ret));
+ auth_send_retry();
+ return;
+ }
+ krb5_free_ap_rep_enc_part(context, reply);
+ mutual_complete = 1;
+ }
+ return;
+ case KRB_FORWARD_ACCEPT:
+ printf("[ Kerberos V5 accepted forwarded credentials ]\r\n");
+ return;
+ case KRB_FORWARD_REJECT:
+ printf("[ Kerberos V5 refuses forwarded credentials because %.*s ]\r\n",
+ cnt, data);
+ return;
+ default:
+ if (auth_debug_mode)
+ printf("Unknown Kerberos option %d\r\n", data[-1]);
+ return;
+ }
+}
+
+int
+kerberos5_status(Authenticator *ap, char *name, size_t name_sz, int level)
+{
+ if (level < AUTH_USER)
+ return(level);
+
+ if (UserNameRequested &&
+ krb5_kuserok(context,
+ ticket->client,
+ UserNameRequested))
+ {
+ strlcpy(name, UserNameRequested, name_sz);
+#if defined(DCE)
+ dfsk5ok = 1;
+#endif
+ return(AUTH_VALID);
+ } else
+ return(AUTH_USER);
+}
+
+#define BUMP(buf, len) while (*(buf)) {++(buf), --(len);}
+#define ADDC(buf, len, c) if ((len) > 0) {*(buf)++ = (c); --(len);}
+
+void
+kerberos5_printsub(unsigned char *data, int cnt, unsigned char *buf, int buflen)
+{
+ int i;
+
+ buf[buflen-1] = '\0'; /* make sure it's NULL terminated */
+ buflen -= 1;
+
+ switch(data[3]) {
+ case KRB_REJECT: /* Rejected (reason might follow) */
+ strlcpy((char *)buf, " REJECT ", buflen);
+ goto common;
+
+ case KRB_ACCEPT: /* Accepted (name might follow) */
+ strlcpy((char *)buf, " ACCEPT ", buflen);
+ common:
+ BUMP(buf, buflen);
+ if (cnt <= 4)
+ break;
+ ADDC(buf, buflen, '"');
+ for (i = 4; i < cnt; i++)
+ ADDC(buf, buflen, data[i]);
+ ADDC(buf, buflen, '"');
+ ADDC(buf, buflen, '\0');
+ break;
+
+
+ case KRB_AUTH: /* Authentication data follows */
+ strlcpy((char *)buf, " AUTH", buflen);
+ goto common2;
+
+ case KRB_RESPONSE:
+ strlcpy((char *)buf, " RESPONSE", buflen);
+ goto common2;
+
+ case KRB_FORWARD: /* Forwarded credentials follow */
+ strlcpy((char *)buf, " FORWARD", buflen);
+ goto common2;
+
+ case KRB_FORWARD_ACCEPT: /* Forwarded credentials accepted */
+ strlcpy((char *)buf, " FORWARD_ACCEPT", buflen);
+ goto common2;
+
+ case KRB_FORWARD_REJECT: /* Forwarded credentials rejected */
+ /* (reason might follow) */
+ strlcpy((char *)buf, " FORWARD_REJECT", buflen);
+ goto common2;
+
+ default:
+ snprintf((char*)buf, buflen, " %d (unknown)", data[3]);
+ common2:
+ BUMP(buf, buflen);
+ for (i = 4; i < cnt; i++) {
+ snprintf((char*)buf, buflen, " %d", data[i]);
+ BUMP(buf, buflen);
+ }
+ break;
+ }
+}
+
+void
+kerberos5_forward(Authenticator *ap)
+{
+ krb5_error_code ret;
+ krb5_ccache ccache;
+ krb5_creds creds;
+ KDCOptions flags;
+ krb5_data out_data;
+ krb5_principal principal;
+
+ ret = krb5_cc_default (context, &ccache);
+ if (ret) {
+ if (auth_debug_mode)
+ printf ("KerberosV5: could not get default ccache: %s\r\n",
+ krb5_get_err_text (context, ret));
+ return;
+ }
+
+ ret = krb5_cc_get_principal (context, ccache, &principal);
+ if (ret) {
+ if (auth_debug_mode)
+ printf ("KerberosV5: could not get principal: %s\r\n",
+ krb5_get_err_text (context, ret));
+ return;
+ }
+
+ memset (&creds, 0, sizeof(creds));
+
+ creds.client = principal;
+
+ ret = krb5_build_principal (context,
+ &creds.server,
+ strlen(principal->realm),
+ principal->realm,
+ "krbtgt",
+ principal->realm,
+ NULL);
+
+ if (ret) {
+ if (auth_debug_mode)
+ printf ("KerberosV5: could not get principal: %s\r\n",
+ krb5_get_err_text (context, ret));
+ return;
+ }
+
+ creds.times.endtime = 0;
+
+ memset(&flags, 0, sizeof(flags));
+ flags.forwarded = 1;
+ if (forward_flags & OPTS_FORWARDABLE_CREDS)
+ flags.forwardable = 1;
+
+ ret = krb5_get_forwarded_creds (context,
+ auth_context,
+ ccache,
+ KDCOptions2int(flags),
+ RemoteHostName,
+ &creds,
+ &out_data);
+ if (ret) {
+ if (auth_debug_mode)
+ printf ("Kerberos V5: error getting forwarded creds: %s\r\n",
+ krb5_get_err_text (context, ret));
+ return;
+ }
+
+ if(!Data(ap, KRB_FORWARD, out_data.data, out_data.length)) {
+ if (auth_debug_mode)
+ printf("Not enough room for authentication data\r\n");
+ } else {
+ if (auth_debug_mode)
+ printf("Forwarded local Kerberos V5 credentials to server\r\n");
+ }
+}
+
+#if defined(DCE)
+/* if this was a K5 authentication try and join a PAG for the user. */
+void
+kerberos5_dfspag(void)
+{
+ if (dfsk5ok) {
+ dfspag = krb5_dfs_pag(context, dfsfwd, ticket->client,
+ UserNameRequested);
+ }
+}
+#endif
+
+int
+kerberos5_set_forward(int on)
+{
+ if(on == 0)
+ forward_flags &= ~OPTS_FORWARD_CREDS;
+ if(on == 1)
+ forward_flags |= OPTS_FORWARD_CREDS;
+ if(on == -1)
+ forward_flags ^= OPTS_FORWARD_CREDS;
+ return 0;
+}
+
+int
+kerberos5_set_forwardable(int on)
+{
+ if(on == 0)
+ forward_flags &= ~OPTS_FORWARDABLE_CREDS;
+ if(on == 1)
+ forward_flags |= OPTS_FORWARDABLE_CREDS;
+ if(on == -1)
+ forward_flags ^= OPTS_FORWARDABLE_CREDS;
+ return 0;
+}
+
+#endif /* KRB5 */
OpenPOWER on IntegriCloud