2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
10 /* The rxkad security object. Authentication using a DES-encrypted
11 * Kerberos-style ticket. These are the client-only routines. They do not
12 * make any use of DES. */
14 #include <afsconfig.h>
16 #include "afs/param.h"
18 #include <afs/param.h>
28 #if defined(AFS_AIX_ENV) || defined(AFS_AUX_ENV) || defined(AFS_SUN5_ENV) || defined(AFS_XBSD_ENV)
31 #ifdef AFS_LINUX20_ENV
35 #include "netinet/in.h"
38 #include "afs/sysincludes.h"
40 #ifndef AFS_LINUX22_ENV
41 #include "rpc/types.h"
47 #include <sys/types.h>
53 #include <netinet/in.h>
58 #ifdef AFS_PTHREAD_ENV
60 #endif /* AFS_PTHREAD_ENV */
64 #include "private_data.h"
65 #define XPRT_RXKAD_CLIENT
68 #define max(a,b) ((a) < (b)? (b) : (a))
71 static struct rx_securityOps rxkad_client_ops = {
73 rxkad_NewConnection, /* every new connection */
74 rxkad_PreparePacket, /* once per packet creation */
75 0, /* send packet (once per retrans.) */
79 rxkad_GetResponse, /* respond to challenge packet */
81 rxkad_CheckPacket, /* check data packet */
82 rxkad_DestroyConnection,
89 /* To minimize changes to epoch, we set this Cuid once, and everyone (including
90 * rxnull) uses it after that. This means that the Ksession of the first
91 * authencticated connection should be a good one. */
93 #ifdef AFS_PTHREAD_ENV
95 * This mutex protects the following global variables:
100 pthread_mutex_t rxkad_client_uid_mutex;
101 #define LOCK_CUID osi_Assert(pthread_mutex_lock(&rxkad_client_uid_mutex)==0)
102 #define UNLOCK_CUID osi_Assert(pthread_mutex_unlock(&rxkad_client_uid_mutex)==0)
106 #endif /* AFS_PTHREAD_ENV */
108 static afs_int32 Cuid[2]; /* set once and shared by all */
109 int rxkad_EpochWasSet = 0; /* TRUE => we called rx_SetEpoch */
111 /* allocate a new connetion ID in place */
113 rxkad_AllocCID(struct rx_securityClass *aobj, struct rx_connection *aconn)
115 struct rxkad_cprivate *tcp;
116 struct rxkad_cidgen tgen;
117 static afs_int32 counter = 0; /* not used anymore */
122 tgen.ipAddr = rxi_getaddr(); /* comes back in net order */
123 clock_GetTime(&tgen.time); /* changes time1 and time2 */
124 tgen.time.sec = htonl(tgen.time.sec);
125 tgen.time.usec = htonl(tgen.time.usec);
126 tgen.counter = htonl(counter);
129 tgen.random1 = afs_random() & 0x7fffffff; /* was "80000" */
130 tgen.random2 = afs_random() & 0x7fffffff; /* was "htonl(100)" */
132 tgen.random1 = htonl(getpid());
133 tgen.random2 = htonl(100);
136 /* block is ready for encryption with session key, let's go for it. */
137 tcp = (struct rxkad_cprivate *)aobj->privateData;
138 memcpy((void *)xor, (void *)tcp->ivec, 2 * sizeof(afs_int32));
139 fc_cbc_encrypt((char *)&tgen, (char *)&tgen, sizeof(tgen),
140 tcp->keysched, xor, ENCRYPT);
142 /* Create a session key so that we can encrypt it */
146 ((char *)&tgen) + sizeof(tgen) - ENCRYPTIONBLOCKSIZE,
147 ENCRYPTIONBLOCKSIZE);
148 Cuid[0] = (Cuid[0] & ~0x40000000) | 0x80000000;
149 Cuid[1] &= RX_CIDMASK;
150 rx_SetEpoch(Cuid[0]); /* for future rxnull connections */
158 aconn->epoch = Cuid[0];
159 aconn->cid = Cuid[1];
160 Cuid[1] += 1 << RX_CIDSHIFT;
165 /* Allocate a new client security object. Called with the encryption level,
166 * the session key and the ticket for the other side obtained from the
167 * AuthServer. Refers to export control to determine level. */
169 struct rx_securityClass *
170 rxkad_NewClientSecurityObject(rxkad_level level,
171 struct ktc_encryptionKey *sessionkey,
172 afs_int32 kvno, int ticketLen, char *ticket)
174 struct rx_securityClass *tsc;
175 struct rxkad_cprivate *tcp;
179 size = sizeof(struct rx_securityClass);
180 tsc = rxi_Alloc(size);
181 memset((void *)tsc, 0, size);
182 tsc->refCount = 1; /* caller gets one for free */
183 tsc->ops = &rxkad_client_ops;
185 psize = PDATA_SIZE(ticketLen);
186 tcp = rxi_Alloc(psize);
187 memset((void *)tcp, 0, psize);
188 tsc->privateData = (char *)tcp;
189 tcp->type |= rxkad_client;
191 code = fc_keysched(sessionkey, tcp->keysched);
193 rxi_Free(tcp, psize);
194 rxi_Free(tsc, sizeof(struct rx_securityClass));
195 return 0; /* bad key */
197 memcpy((void *)tcp->ivec, (void *)sessionkey, sizeof(tcp->ivec));
198 tcp->kvno = kvno; /* key version number */
199 tcp->ticketLen = ticketLen; /* length of ticket */
200 if (tcp->ticketLen > MAXKTCTICKETLEN) {
201 rxi_Free(tcp, psize);
202 rxi_Free(tsc, sizeof(struct rx_securityClass));
203 return 0; /* bad key */
205 memcpy(tcp->ticket, ticket, ticketLen);
207 INC_RXKAD_STATS(clientObjects);
211 /* client: respond to a challenge packet */
214 rxkad_GetResponse(struct rx_securityClass *aobj, struct rx_connection *aconn,
215 struct rx_packet *apacket)
217 struct rxkad_cprivate *tcp;
219 int v2; /* whether server is old style or v2 */
220 afs_int32 challengeID;
223 int responseSize, missing;
224 struct rxkad_v2ChallengeResponse r_v2;
225 struct rxkad_oldChallengeResponse r_old;
227 tcp = (struct rxkad_cprivate *)aobj->privateData;
229 if (!(tcp->type & rxkad_client))
230 return RXKADINCONSISTENCY;
232 v2 = (rx_Contiguous(apacket) > sizeof(struct rxkad_oldChallenge));
233 tp = rx_DataOf(apacket);
235 if (v2) { /* v2 challenge */
236 struct rxkad_v2Challenge *c_v2;
237 if (rx_GetDataSize(apacket) < sizeof(struct rxkad_v2Challenge))
238 return RXKADPACKETSHORT;
239 c_v2 = (struct rxkad_v2Challenge *)tp;
240 challengeID = ntohl(c_v2->challengeID);
241 level = ntohl(c_v2->level);
242 } else { /* old format challenge */
243 struct rxkad_oldChallenge *c_old;
244 if (rx_GetDataSize(apacket) < sizeof(struct rxkad_oldChallenge))
245 return RXKADPACKETSHORT;
246 c_old = (struct rxkad_oldChallenge *)tp;
247 challengeID = ntohl(c_old->challengeID);
248 level = ntohl(c_old->level);
251 if (level > tcp->level)
252 return RXKADLEVELFAIL;
253 INC_RXKAD_STATS(challenges[rxkad_LevelIndex(tcp->level)]);
257 memset((void *)&r_v2, 0, sizeof(r_v2));
258 r_v2.version = htonl(RXKAD_CHALLENGE_PROTOCOL_VERSION);
260 (void)rxkad_SetupEndpoint(aconn, &r_v2.encrypted.endpoint);
261 (void)rxi_GetCallNumberVector(aconn, r_v2.encrypted.callNumbers);
262 for (i = 0; i < RX_MAXCALLS; i++) {
263 if (r_v2.encrypted.callNumbers[i] < 0)
264 return RXKADINCONSISTENCY;
265 r_v2.encrypted.callNumbers[i] =
266 htonl(r_v2.encrypted.callNumbers[i]);
268 r_v2.encrypted.incChallengeID = htonl(challengeID + 1);
269 r_v2.encrypted.level = htonl((afs_int32) tcp->level);
270 r_v2.kvno = htonl(tcp->kvno);
271 r_v2.ticketLen = htonl(tcp->ticketLen);
272 r_v2.encrypted.endpoint.cksum = rxkad_CksumChallengeResponse(&r_v2);
273 memcpy((void *)xor, (void *)tcp->ivec, 2 * sizeof(afs_int32));
274 fc_cbc_encrypt(&r_v2.encrypted, &r_v2.encrypted,
275 sizeof(r_v2.encrypted), tcp->keysched, xor, ENCRYPT);
276 response = (char *)&r_v2;
277 responseSize = sizeof(r_v2);
279 memset((void *)&r_old, 0, sizeof(r_old));
280 r_old.encrypted.incChallengeID = htonl(challengeID + 1);
281 r_old.encrypted.level = htonl((afs_int32) tcp->level);
282 r_old.kvno = htonl(tcp->kvno);
283 r_old.ticketLen = htonl(tcp->ticketLen);
284 fc_ecb_encrypt(&r_old.encrypted, &r_old.encrypted, tcp->keysched,
286 response = (char *)&r_old;
287 responseSize = sizeof(r_old);
290 if (RX_MAX_PACKET_DATA_SIZE < responseSize + tcp->ticketLen)
291 return RXKADPACKETSHORT; /* not enough space */
293 rx_computelen(apacket, missing);
294 missing = responseSize + tcp->ticketLen - missing;
296 if (rxi_AllocDataBuf(apacket, missing, RX_PACKET_CLASS_SEND) > 0)
297 return RXKADPACKETSHORT; /* not enough space */
299 /* copy response and ticket into packet */
300 rx_packetwrite(apacket, 0, responseSize, response);
301 rx_packetwrite(apacket, responseSize, tcp->ticketLen, tcp->ticket);
303 rx_SetDataSize(apacket, responseSize + tcp->ticketLen);
308 rxkad_ResetState(void)
312 rxkad_EpochWasSet = 0;