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tkey.h
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/* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ #ifndef DNS_TKEY_H #define DNS_TKEY_H 1 /*! \file dns/tkey.h */ #include <inttypes.h> #include <stdbool.h> #include <isc/lang.h> #include <dns/types.h> #include <dst/dst.h> #include <dst/gssapi.h> ISC_LANG_BEGINDECLS /* Key agreement modes */ #define DNS_TKEYMODE_SERVERASSIGNED 1 #define DNS_TKEYMODE_DIFFIEHELLMAN 2 #define DNS_TKEYMODE_GSSAPI 3 #define DNS_TKEYMODE_RESOLVERASSIGNED 4 #define DNS_TKEYMODE_DELETE 5 struct dns_tkeyctx { dst_key_t *dhkey; dns_name_t *domain; gss_cred_id_t gsscred; isc_mem_t *mctx; isc_entropy_t *ectx; char *gssapi_keytab; }; isc_result_t dns_tkeyctx_create(isc_mem_t *mctx, isc_entropy_t *ectx, dns_tkeyctx_t **tctxp); /*%< * Create an empty TKEY context. * * Requires: *\li 'mctx' is not NULL *\li 'tctx' is not NULL *\li '*tctx' is NULL * * Returns *\li #ISC_R_SUCCESS *\li #ISC_R_NOMEMORY *\li return codes from dns_name_fromtext() */ void dns_tkeyctx_destroy(dns_tkeyctx_t **tctxp); /*%< * Frees all data associated with the TKEY context * * Requires: *\li 'tctx' is not NULL *\li '*tctx' is not NULL */ isc_result_t dns_tkey_processquery(dns_message_t *msg, dns_tkeyctx_t *tctx, dns_tsig_keyring_t *ring); /*%< * Processes a query containing a TKEY record, adding or deleting TSIG * keys if necessary, and modifies the message to contain the response. * * Requires: *\li 'msg' is a valid message *\li 'tctx' is a valid TKEY context *\li 'ring' is a valid TSIG keyring * * Returns *\li #ISC_R_SUCCESS msg was updated (the TKEY operation succeeded, * or msg now includes a TKEY with an error set) * DNS_R_FORMERR the packet was malformed (missing a TKEY * or KEY). *\li other An error occurred while processing the message */ isc_result_t dns_tkey_builddhquery(dns_message_t *msg, dst_key_t *key, dns_name_t *name, dns_name_t *algorithm, isc_buffer_t *nonce, uint32_t lifetime); /*%< * Builds a query containing a TKEY that will generate a shared * secret using a Diffie-Hellman key exchange. The shared key * will be of the specified algorithm (only DNS_TSIG_HMACMD5_NAME * is supported), and will be named either 'name', * 'name' + server chosen domain, or random data + server chosen domain * if 'name' == dns_rootname. If nonce is not NULL, it supplies * random data used in the shared secret computation. The key is * requested to have the specified lifetime (in seconds) * * * Requires: *\li 'msg' is a valid message *\li 'key' is a valid Diffie Hellman dst key *\li 'name' is a valid name *\li 'algorithm' is a valid name * * Returns: *\li #ISC_R_SUCCESS msg was successfully updated to include the * query to be sent *\li other an error occurred while building the message */ isc_result_t dns_tkey_buildgssquery(dns_message_t *msg, dns_name_t *name, dns_name_t *gname, isc_buffer_t *intoken, uint32_t lifetime, gss_ctx_id_t *context, bool win2k, isc_mem_t *mctx, char **err_message); /*%< * Builds a query containing a TKEY that will generate a GSSAPI context. * The key is requested to have the specified lifetime (in seconds). * * Requires: *\li 'msg' is a valid message *\li 'name' is a valid name *\li 'gname' is a valid name *\li 'context' is a pointer to a valid gss_ctx_id_t * (which may have the value GSS_C_NO_CONTEXT) *\li 'win2k' when true says to turn on some hacks to work * with the non-standard GSS-TSIG of Windows 2000 * * Returns: *\li ISC_R_SUCCESS msg was successfully updated to include the * query to be sent *\li other an error occurred while building the message *\li *err_message optional error message */ isc_result_t dns_tkey_builddeletequery(dns_message_t *msg, dns_tsigkey_t *key); /*%< * Builds a query containing a TKEY record that will delete the * specified shared secret from the server. * * Requires: *\li 'msg' is a valid message *\li 'key' is a valid TSIG key * * Returns: *\li #ISC_R_SUCCESS msg was successfully updated to include the * query to be sent *\li other an error occurred while building the message */ isc_result_t dns_tkey_processdhresponse(dns_message_t *qmsg, dns_message_t *rmsg, dst_key_t *key, isc_buffer_t *nonce, dns_tsigkey_t **outkey, dns_tsig_keyring_t *ring); /*%< * Processes a response to a query containing a TKEY that was * designed to generate a shared secret using a Diffie-Hellman key * exchange. If the query was successful, a new shared key * is created and added to the list of shared keys. * * Requires: *\li 'qmsg' is a valid message (the query) *\li 'rmsg' is a valid message (the response) *\li 'key' is a valid Diffie Hellman dst key *\li 'outkey' is either NULL or a pointer to NULL *\li 'ring' is a valid keyring or NULL * * Returns: *\li #ISC_R_SUCCESS the shared key was successfully added *\li #ISC_R_NOTFOUND an error occurred while looking for a * component of the query or response */ isc_result_t dns_tkey_processgssresponse(dns_message_t *qmsg, dns_message_t *rmsg, dns_name_t *gname, gss_ctx_id_t *context, isc_buffer_t *outtoken, dns_tsigkey_t **outkey, dns_tsig_keyring_t *ring, char **err_message); /*%< * XXX */ isc_result_t dns_tkey_processdeleteresponse(dns_message_t *qmsg, dns_message_t *rmsg, dns_tsig_keyring_t *ring); /*%< * Processes a response to a query containing a TKEY that was * designed to delete a shared secret. If the query was successful, * the shared key is deleted from the list of shared keys. * * Requires: *\li 'qmsg' is a valid message (the query) *\li 'rmsg' is a valid message (the response) *\li 'ring' is not NULL * * Returns: *\li #ISC_R_SUCCESS the shared key was successfully deleted *\li #ISC_R_NOTFOUND an error occurred while looking for a * component of the query or response */ isc_result_t dns_tkey_gssnegotiate(dns_message_t *qmsg, dns_message_t *rmsg, dns_name_t *server, gss_ctx_id_t *context, dns_tsigkey_t **outkey, dns_tsig_keyring_t *ring, bool win2k, char **err_message); /* * Client side negotiation of GSS-TSIG. Process the response * to a TKEY, and establish a TSIG key if negotiation was successful. * Build a response to the input TKEY message. Can take multiple * calls to successfully establish the context. * * Requires: * 'qmsg' is a valid message, the original TKEY request; * it will be filled with the new message to send * 'rmsg' is a valid message, the incoming TKEY message * 'server' is the server name * 'context' is the input context handle * 'outkey' receives the established key, if non-NULL; * if non-NULL must point to NULL * 'ring' is the keyring in which to establish the key, * or NULL * 'win2k' when true says to turn on some hacks to work * with the non-standard GSS-TSIG of Windows 2000 * * Returns: * ISC_R_SUCCESS context was successfully established * ISC_R_NOTFOUND couldn't find a needed part of the query * or response * DNS_R_CONTINUE additional context negotiation is required; * send the new qmsg to the server */ ISC_LANG_ENDDECLS #endif /* DNS_TKEY_H */
