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>
29 #if defined(AFS_AIX_ENV) || defined(AFS_AUX_ENV) || defined(AFS_SUN5_ENV)
32 #ifdef AFS_LINUX20_ENV
36 #include "netinet/in.h"
39 #include "afs/sysincludes.h"
41 #ifndef AFS_LINUX22_ENV
42 #include "rpc/types.h"
48 #include <sys/types.h>
54 #include <netinet/in.h>
58 #ifdef AFS_PTHREAD_ENV
60 #endif /* AFS_PTHREAD_ENV */
63 #include <des/stats.h>
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:
101 pthread_mutex_t rxkad_client_uid_mutex;
102 #define LOCK_CUID assert(pthread_mutex_lock(&rxkad_client_uid_mutex)==0)
103 #define UNLOCK_CUID assert(pthread_mutex_unlock(&rxkad_client_uid_mutex)==0)
107 #endif /* AFS_PTHREAD_ENV */
109 static afs_int32 Cuid[2]; /* set once and shared by all */
110 int rxkad_EpochWasSet = 0; /* TRUE => we called rx_SetEpoch */
112 /* allocate a new connetion ID in place */
114 rxkad_AllocCID(struct rx_securityClass *aobj, struct rx_connection *aconn)
116 struct rxkad_cprivate *tcp;
117 struct rxkad_cidgen tgen;
118 static afs_int32 counter = 0; /* not used anymore */
123 tgen.ipAddr = rxi_getaddr(); /* comes back in net order */
124 clock_GetTime(&tgen.time); /* changes time1 and time2 */
125 tgen.time.sec = htonl(tgen.time.sec);
126 tgen.time.usec = htonl(tgen.time.usec);
127 tgen.counter = htonl(counter);
130 tgen.random1 = afs_random() & 0x7fffffff; /* was "80000" */
131 tgen.random2 = afs_random() & 0x7fffffff; /* was "htonl(100)" */
133 tgen.random1 = htonl(getpid());
134 tgen.random2 = htonl(100);
137 /* block is ready for encryption with session key, let's go for it. */
138 tcp = (struct rxkad_cprivate *)aobj->privateData;
139 memcpy((void *)xor, (void *)tcp->ivec, 2 * sizeof(afs_int32));
140 fc_cbc_encrypt((char *)&tgen, (char *)&tgen, sizeof(tgen),
141 tcp->keysched, xor, ENCRYPT);
143 /* Create a session key so that we can encrypt it */
147 ((char *)&tgen) + sizeof(tgen) - ENCRYPTIONBLOCKSIZE,
148 ENCRYPTIONBLOCKSIZE);
149 Cuid[0] = (Cuid[0] & ~0x40000000) | 0x80000000;
150 Cuid[1] &= RX_CIDMASK;
151 rx_SetEpoch(Cuid[0]); /* for future rxnull connections */
159 aconn->epoch = Cuid[0];
160 aconn->cid = Cuid[1];
161 Cuid[1] += 1 << RX_CIDSHIFT;
166 /* Allocate a new client security object. Called with the encryption level,
167 * the session key and the ticket for the other side obtained from the
168 * AuthServer. Refers to export control to determine level. */
170 struct rx_securityClass *
171 rxkad_NewClientSecurityObject(rxkad_level level,
172 struct ktc_encryptionKey *sessionkey,
173 afs_int32 kvno, int ticketLen, char *ticket)
175 struct rx_securityClass *tsc;
176 struct rxkad_cprivate *tcp;
180 size = sizeof(struct rx_securityClass);
181 tsc = (struct rx_securityClass *)rxi_Alloc(size);
182 memset((void *)tsc, 0, size);
183 tsc->refCount = 1; /* caller gets one for free */
184 tsc->ops = &rxkad_client_ops;
186 psize = PDATA_SIZE(ticketLen);
187 tcp = (struct rxkad_cprivate *)rxi_Alloc(psize);
188 memset((void *)tcp, 0, psize);
189 tsc->privateData = (char *)tcp;
190 tcp->type |= rxkad_client;
192 code = fc_keysched(sessionkey, tcp->keysched);
194 rxi_Free(tcp, psize);
195 rxi_Free(tsc, sizeof(struct rx_securityClass));
196 return 0; /* bad key */
198 memcpy((void *)tcp->ivec, (void *)sessionkey, sizeof(tcp->ivec));
199 tcp->kvno = kvno; /* key version number */
200 tcp->ticketLen = ticketLen; /* length of ticket */
201 if (tcp->ticketLen > MAXKTCTICKETLEN) {
202 rxi_Free(tcp, psize);
203 rxi_Free(tsc, sizeof(struct rx_securityClass));
204 return 0; /* bad key */
206 memcpy(tcp->ticket, ticket, ticketLen);
208 INC_RXKAD_STATS(clientObjects);
212 /* client: respond to a challenge packet */
215 rxkad_GetResponse(struct rx_securityClass *aobj, struct rx_connection *aconn,
216 struct rx_packet *apacket)
218 struct rxkad_cprivate *tcp;
220 int v2; /* whether server is old style or v2 */
221 afs_int32 challengeID;
224 int responseSize, missing;
225 struct rxkad_v2ChallengeResponse r_v2;
226 struct rxkad_oldChallengeResponse r_old;
228 tcp = (struct rxkad_cprivate *)aobj->privateData;
230 if (!(tcp->type & rxkad_client))
231 return RXKADINCONSISTENCY;
233 v2 = (rx_Contiguous(apacket) > sizeof(struct rxkad_oldChallenge));
234 tp = rx_DataOf(apacket);
236 if (v2) { /* v2 challenge */
237 struct rxkad_v2Challenge *c_v2;
238 if (rx_GetDataSize(apacket) < sizeof(struct rxkad_v2Challenge))
239 return RXKADPACKETSHORT;
240 c_v2 = (struct rxkad_v2Challenge *)tp;
241 challengeID = ntohl(c_v2->challengeID);
242 level = ntohl(c_v2->level);
243 } else { /* old format challenge */
244 struct rxkad_oldChallenge *c_old;
245 if (rx_GetDataSize(apacket) < sizeof(struct rxkad_oldChallenge))
246 return RXKADPACKETSHORT;
247 c_old = (struct rxkad_oldChallenge *)tp;
248 challengeID = ntohl(c_old->challengeID);
249 level = ntohl(c_old->level);
252 if (level > tcp->level)
253 return RXKADLEVELFAIL;
254 INC_RXKAD_STATS(challenges[rxkad_LevelIndex(tcp->level)]);
258 memset((void *)&r_v2, 0, sizeof(r_v2));
259 r_v2.version = htonl(RXKAD_CHALLENGE_PROTOCOL_VERSION);
261 (void)rxkad_SetupEndpoint(aconn, &r_v2.encrypted.endpoint);
262 (void)rxi_GetCallNumberVector(aconn, r_v2.encrypted.callNumbers);
263 for (i = 0; i < RX_MAXCALLS; i++) {
264 if (r_v2.encrypted.callNumbers[i] < 0)
265 return RXKADINCONSISTENCY;
266 r_v2.encrypted.callNumbers[i] =
267 htonl(r_v2.encrypted.callNumbers[i]);
269 r_v2.encrypted.incChallengeID = htonl(challengeID + 1);
270 r_v2.encrypted.level = htonl((afs_int32) tcp->level);
271 r_v2.kvno = htonl(tcp->kvno);
272 r_v2.ticketLen = htonl(tcp->ticketLen);
273 r_v2.encrypted.endpoint.cksum = rxkad_CksumChallengeResponse(&r_v2);
274 memcpy((void *)xor, (void *)tcp->ivec, 2 * sizeof(afs_int32));
275 fc_cbc_encrypt(&r_v2.encrypted, &r_v2.encrypted,
276 sizeof(r_v2.encrypted), tcp->keysched, xor, ENCRYPT);
277 response = (char *)&r_v2;
278 responseSize = sizeof(r_v2);
280 memset((void *)&r_old, 0, sizeof(r_old));
281 r_old.encrypted.incChallengeID = htonl(challengeID + 1);
282 r_old.encrypted.level = htonl((afs_int32) tcp->level);
283 r_old.kvno = htonl(tcp->kvno);
284 r_old.ticketLen = htonl(tcp->ticketLen);
285 fc_ecb_encrypt(&r_old.encrypted, &r_old.encrypted, tcp->keysched,
287 response = (char *)&r_old;
288 responseSize = sizeof(r_old);
291 if (RX_MAX_PACKET_DATA_SIZE < responseSize + tcp->ticketLen)
292 return RXKADPACKETSHORT; /* not enough space */
294 rx_computelen(apacket, missing);
295 missing = responseSize + tcp->ticketLen - missing;
297 if (rxi_AllocDataBuf(apacket, missing, RX_PACKET_CLASS_SEND) > 0)
298 return RXKADPACKETSHORT; /* not enough space */
300 /* copy response and ticket into packet */
301 rx_packetwrite(apacket, 0, responseSize, response);
302 rx_packetwrite(apacket, responseSize, tcp->ticketLen, tcp->ticket);
304 rx_SetDataSize(apacket, responseSize + tcp->ticketLen);
309 rxkad_ResetState(void)
313 rxkad_EpochWasSet = 0;