Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg

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

1 files changed, 269 insertions, 0 deletions

diff --git a/third_party/heimdal/lib/krb5/recvauth.c b/third_party/heimdal/lib/krb5/recvauth.c
new file mode 100644
index 0000000..6563783
--- /dev/null
+++ b/third_party/heimdal/lib/krb5/recvauth.c
@@ -0,0 +1,269 @@
+/*
+ * 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);
+    if (len > 1024 * 1024) {
+        krb5_set_error_message(context, ret = KRB5_SENDAUTH_REJECTED,
+                               "AP-REQ too long");
+        return ret;
+    }
+    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;
+}