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-rw-r--r--third_party/heimdal/lib/krb5/recvauth.c264
1 files changed, 264 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/krb5/recvauth.c b/third_party/heimdal/lib/krb5/recvauth.c
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+++ b/third_party/heimdal/lib/krb5/recvauth.c
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+/*
+ * Copyright (c) 1997-2007 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * 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. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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.
+ */
+
+#include "krb5_locl.h"
+
+/*
+ * See `sendauth.c' for the format.
+ */
+
+static krb5_boolean
+match_exact(const void *data, const char *appl_version)
+{
+ return strcmp(data, appl_version) == 0;
+}
+
+/**
+ * Perform the server side of the sendauth protocol.
+ *
+ * @param context Kerberos 5 context.
+ * @param auth_context authentication context of the peer.
+ * @param p_fd socket associated to the connection.
+ * @param appl_version server-specific string.
+ * @param server server principal.
+ * @param flags if KRB5_RECVAUTH_IGNORE_VERSION is set, skip the sendauth version
+ * part of the protocol.
+ * @param keytab server keytab.
+ * @param ticket on success, set to the authenticated client credentials.
+ * Must be deallocated with krb5_free_ticket(). If not
+ * interested, pass a NULL value.
+ *
+ * @return 0 to indicate success. Otherwise a Kerberos error code is
+ * returned, see krb5_get_error_message().
+ */
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_recvauth(krb5_context context,
+ krb5_auth_context *auth_context,
+ krb5_pointer p_fd,
+ const char *appl_version,
+ krb5_principal server,
+ int32_t flags,
+ krb5_keytab keytab,
+ krb5_ticket **ticket)
+{
+ return krb5_recvauth_match_version(context, auth_context, p_fd,
+ match_exact, appl_version,
+ server, flags,
+ keytab, ticket);
+}
+
+/**
+ * Perform the server side of the sendauth protocol like krb5_recvauth(), but support
+ * a user-specified callback, \a match_appl_version, to perform the match of the application
+ * version \a match_data.
+ */
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_recvauth_match_version(krb5_context context,
+ krb5_auth_context *auth_context,
+ krb5_pointer p_fd,
+ krb5_boolean (*match_appl_version)(const void *,
+ const char*),
+ const void *match_data,
+ krb5_principal server,
+ int32_t flags,
+ krb5_keytab keytab,
+ krb5_ticket **ticket)
+{
+ krb5_error_code ret;
+ const char *version = KRB5_SENDAUTH_VERSION;
+ char her_version[sizeof(KRB5_SENDAUTH_VERSION)];
+ char *her_appl_version;
+ uint32_t len;
+ u_char repl;
+ krb5_data data;
+ krb5_flags ap_options;
+ ssize_t n;
+
+ /*
+ * If there are no addresses in auth_context, get them from `fd'.
+ */
+
+ if (*auth_context == NULL) {
+ ret = krb5_auth_con_init (context, auth_context);
+ if (ret)
+ return ret;
+ }
+
+ ret = krb5_auth_con_setaddrs_from_fd (context,
+ *auth_context,
+ p_fd);
+ if (ret)
+ return ret;
+
+ /*
+ * Expect SENDAUTH protocol version.
+ */
+ if(!(flags & KRB5_RECVAUTH_IGNORE_VERSION)) {
+ n = krb5_net_read (context, p_fd, &len, 4);
+ if (n < 0) {
+ ret = errno ? errno : EINVAL;
+ krb5_set_error_message(context, ret, "read: %s", strerror(ret));
+ return ret;
+ }
+ if (n == 0) {
+ krb5_set_error_message(context, KRB5_SENDAUTH_BADAUTHVERS,
+ N_("Failed to receive sendauth data", ""));
+ return KRB5_SENDAUTH_BADAUTHVERS;
+ }
+ len = ntohl(len);
+ if (len != sizeof(her_version)
+ || krb5_net_read (context, p_fd, her_version, len) != len
+ || strncmp (version, her_version, len) != 0) {
+ repl = 1;
+ krb5_net_write (context, p_fd, &repl, 1);
+ krb5_clear_error_message (context);
+ return KRB5_SENDAUTH_BADAUTHVERS;
+ }
+ }
+
+ /*
+ * Expect application protocol version.
+ */
+ n = krb5_net_read (context, p_fd, &len, 4);
+ if (n < 0) {
+ ret = errno ? errno : EINVAL;
+ krb5_set_error_message(context, ret, "read: %s", strerror(ret));
+ return ret;
+ }
+ if (n == 0) {
+ krb5_clear_error_message (context);
+ return KRB5_SENDAUTH_BADAPPLVERS;
+ }
+ len = ntohl(len);
+ her_appl_version = malloc (len);
+ if (her_appl_version == NULL) {
+ repl = 2;
+ krb5_net_write (context, p_fd, &repl, 1);
+ return krb5_enomem(context);
+ }
+ if (krb5_net_read (context, p_fd, her_appl_version, len) != len
+ || !(*match_appl_version)(match_data, her_appl_version)) {
+ repl = 2;
+ krb5_net_write (context, p_fd, &repl, 1);
+ krb5_set_error_message(context, KRB5_SENDAUTH_BADAPPLVERS,
+ N_("wrong sendauth application version (%s)", ""),
+ her_appl_version);
+ free (her_appl_version);
+ return KRB5_SENDAUTH_BADAPPLVERS;
+ }
+ free (her_appl_version);
+
+ /*
+ * Send OK.
+ */
+ repl = 0;
+ if (krb5_net_write (context, p_fd, &repl, 1) != 1) {
+ ret = errno ? errno : EINVAL;
+ krb5_set_error_message(context, ret, "write: %s", strerror(ret));
+ return ret;
+ }
+
+ /*
+ * Until here, the fields in the message were in cleartext and unauthenticated.
+ * From now on, Kerberos kicks in.
+ */
+
+ /*
+ * Expect AP_REQ.
+ */
+ krb5_data_zero (&data);
+ ret = krb5_read_message (context, p_fd, &data);
+ if (ret)
+ return ret;
+
+ ret = krb5_rd_req (context,
+ auth_context,
+ &data,
+ server,
+ keytab,
+ &ap_options,
+ ticket);
+ krb5_data_free (&data);
+ if (ret) {
+ krb5_data error_data;
+ krb5_error_code ret2;
+
+ ret2 = krb5_mk_error (context,
+ ret,
+ NULL,
+ NULL,
+ NULL,
+ server,
+ NULL,
+ NULL,
+ &error_data);
+ if (ret2 == 0) {
+ krb5_write_message (context, p_fd, &error_data);
+ krb5_data_free (&error_data);
+ }
+ return ret;
+ }
+
+ /*
+ * Send OK.
+ */
+ len = 0;
+ if (krb5_net_write (context, p_fd, &len, 4) != 4) {
+ ret = errno ? errno : EINVAL;
+ krb5_set_error_message(context, ret, "write: %s", strerror(ret));
+ krb5_free_ticket(context, *ticket);
+ *ticket = NULL;
+ return ret;
+ }
+
+ /*
+ * If client requires mutual authentication, send AP_REP.
+ */
+ if (ap_options & AP_OPTS_MUTUAL_REQUIRED) {
+ ret = krb5_mk_rep (context, *auth_context, &data);
+ if (ret) {
+ krb5_free_ticket(context, *ticket);
+ *ticket = NULL;
+ return ret;
+ }
+
+ ret = krb5_write_message (context, p_fd, &data);
+ if (ret) {
+ krb5_free_ticket(context, *ticket);
+ *ticket = NULL;
+ return ret;
+ }
+ krb5_data_free (&data);
+ }
+ return 0;
+}
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