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 #ifdef AFS_LINUX20_ENV
33 #include "netinet/in.h"
36 #include "afs/sysincludes.h"
38 #ifndef AFS_LINUX22_ENV
39 #include "rpc/types.h"
45 #include <sys/types.h>
57 #include <netinet/in.h>
61 #ifdef AFS_PTHREAD_ENV
63 #endif /* AFS_PTHREAD_ENV */
66 #include "private_data.h"
67 #define XPRT_RXKAD_CLIENT
70 #define max(a,b) ((a) < (b)? (b) : (a))
73 static struct rx_securityOps rxkad_client_ops = {
75 rxkad_NewConnection, /* every new connection */
76 rxkad_PreparePacket, /* once per packet creation */
77 0, /* send packet (once per retrans.) */
81 rxkad_GetResponse, /* respond to challenge packet */
83 rxkad_CheckPacket, /* check data packet */
84 rxkad_DestroyConnection,
91 /* To minimize changes to epoch, we set this Cuid once, and everyone (including
92 * rxnull) uses it after that. This means that the Ksession of the first
93 * authencticated connection should be a good one. */
95 #ifdef AFS_PTHREAD_ENV
97 * This mutex protects the following global variables:
103 pthread_mutex_t rxkad_client_uid_mutex;
104 #define LOCK_CUID assert(pthread_mutex_lock(&rxkad_client_uid_mutex)==0)
105 #define UNLOCK_CUID assert(pthread_mutex_unlock(&rxkad_client_uid_mutex)==0)
109 #endif /* AFS_PTHREAD_ENV */
111 static afs_int32 Cuid[2]; /* set once and shared by all */
112 int rxkad_EpochWasSet = 0; /* TRUE => we called rx_SetEpoch */
114 /* allocate a new connetion ID in place */
116 rxkad_AllocCID(struct rx_securityClass *aobj, struct rx_connection *aconn)
118 struct rxkad_cprivate *tcp;
119 struct rxkad_cidgen tgen;
120 static afs_int32 counter = 0; /* not used anymore */
125 tgen.ipAddr = rxi_getaddr(); /* comes back in net order */
126 clock_GetTime(&tgen.time); /* changes time1 and time2 */
127 tgen.time.sec = htonl(tgen.time.sec);
128 tgen.time.usec = htonl(tgen.time.usec);
129 tgen.counter = htonl(counter);
132 tgen.random1 = afs_random() & 0x7fffffff; /* was "80000" */
133 tgen.random2 = afs_random() & 0x7fffffff; /* was "htonl(100)" */
135 tgen.random1 = htonl(getpid());
136 tgen.random2 = htonl(100);
139 /* block is ready for encryption with session key, let's go for it. */
140 tcp = (struct rxkad_cprivate *)aobj->privateData;
141 memcpy((void *)xor, (void *)tcp->ivec, 2 * sizeof(afs_int32));
142 fc_cbc_encrypt((char *)&tgen, (char *)&tgen, sizeof(tgen),
143 tcp->keysched, xor, ENCRYPT);
145 /* Create a session key so that we can encrypt it */
149 ((char *)&tgen) + sizeof(tgen) - ENCRYPTIONBLOCKSIZE,
150 ENCRYPTIONBLOCKSIZE);
151 Cuid[0] = (Cuid[0] & ~0x40000000) | 0x80000000;
152 Cuid[1] &= RX_CIDMASK;
153 rx_SetEpoch(Cuid[0]); /* for future rxnull connections */
161 aconn->epoch = Cuid[0];
162 aconn->cid = Cuid[1];
163 Cuid[1] += 1 << RX_CIDSHIFT;
168 /* Allocate a new client security object. Called with the encryption level,
169 * the session key and the ticket for the other side obtained from the
170 * AuthServer. Refers to export control to determine level. */
172 struct rx_securityClass *
173 rxkad_NewClientSecurityObject(rxkad_level level,
174 struct ktc_encryptionKey *sessionkey,
175 afs_int32 kvno, int ticketLen, char *ticket)
177 struct rx_securityClass *tsc;
178 struct rxkad_cprivate *tcp;
182 size = sizeof(struct rx_securityClass);
183 tsc = (struct rx_securityClass *)rxi_Alloc(size);
184 memset((void *)tsc, 0, size);
185 tsc->refCount = 1; /* caller gets one for free */
186 tsc->ops = &rxkad_client_ops;
188 size = sizeof(struct rxkad_cprivate);
189 tcp = (struct rxkad_cprivate *)rxi_Alloc(size);
190 memset((void *)tcp, 0, size);
191 tsc->privateData = (char *)tcp;
192 tcp->type |= rxkad_client;
194 code = fc_keysched(sessionkey, tcp->keysched);
196 rxi_Free(tcp, sizeof(struct rxkad_cprivate));
197 rxi_Free(tsc, sizeof(struct rx_securityClass));
198 return 0; /* bad key */
200 memcpy((void *)tcp->ivec, (void *)sessionkey, sizeof(tcp->ivec));
201 tcp->kvno = kvno; /* key version number */
202 tcp->ticketLen = ticketLen; /* length of ticket */
203 if (tcp->ticketLen > MAXKTCTICKETLEN) {
204 rxi_Free(tcp, sizeof(struct rxkad_cprivate));
205 rxi_Free(tsc, sizeof(struct rx_securityClass));
206 return 0; /* bad key */
208 memcpy(tcp->ticket, ticket, ticketLen);
211 rxkad_stats_clientObjects++;
216 /* client: respond to a challenge packet */
219 rxkad_GetResponse(struct rx_securityClass *aobj, struct rx_connection *aconn,
220 struct rx_packet *apacket)
222 struct rxkad_cprivate *tcp;
224 int v2; /* whether server is old style or v2 */
225 afs_int32 challengeID;
228 int responseSize, missing;
229 struct rxkad_v2ChallengeResponse r_v2;
230 struct rxkad_oldChallengeResponse r_old;
232 tcp = (struct rxkad_cprivate *)aobj->privateData;
234 if (!(tcp->type & rxkad_client))
235 return RXKADINCONSISTENCY;
237 v2 = (rx_Contiguous(apacket) > sizeof(struct rxkad_oldChallenge));
238 tp = rx_DataOf(apacket);
240 if (v2) { /* v2 challenge */
241 struct rxkad_v2Challenge *c_v2;
242 if (rx_GetDataSize(apacket) < sizeof(struct rxkad_v2Challenge))
243 return RXKADPACKETSHORT;
244 c_v2 = (struct rxkad_v2Challenge *)tp;
245 challengeID = ntohl(c_v2->challengeID);
246 level = ntohl(c_v2->level);
247 } else { /* old format challenge */
248 struct rxkad_oldChallenge *c_old;
249 if (rx_GetDataSize(apacket) < sizeof(struct rxkad_oldChallenge))
250 return RXKADPACKETSHORT;
251 c_old = (struct rxkad_oldChallenge *)tp;
252 challengeID = ntohl(c_old->challengeID);
253 level = ntohl(c_old->level);
256 if (level > tcp->level)
257 return RXKADLEVELFAIL;
259 rxkad_stats.challenges[rxkad_LevelIndex(tcp->level)]++;
264 memset((void *)&r_v2, 0, sizeof(r_v2));
265 r_v2.version = htonl(RXKAD_CHALLENGE_PROTOCOL_VERSION);
267 (void)rxkad_SetupEndpoint(aconn, &r_v2.encrypted.endpoint);
268 (void)rxi_GetCallNumberVector(aconn, r_v2.encrypted.callNumbers);
269 for (i = 0; i < RX_MAXCALLS; i++) {
270 if (r_v2.encrypted.callNumbers[i] < 0)
271 return RXKADINCONSISTENCY;
272 r_v2.encrypted.callNumbers[i] =
273 htonl(r_v2.encrypted.callNumbers[i]);
275 r_v2.encrypted.incChallengeID = htonl(challengeID + 1);
276 r_v2.encrypted.level = htonl((afs_int32) tcp->level);
277 r_v2.kvno = htonl(tcp->kvno);
278 r_v2.ticketLen = htonl(tcp->ticketLen);
279 r_v2.encrypted.endpoint.cksum = rxkad_CksumChallengeResponse(&r_v2);
280 memcpy((void *)xor, (void *)tcp->ivec, 2 * sizeof(afs_int32));
281 fc_cbc_encrypt(&r_v2.encrypted, &r_v2.encrypted,
282 sizeof(r_v2.encrypted), tcp->keysched, xor, ENCRYPT);
283 response = (char *)&r_v2;
284 responseSize = sizeof(r_v2);
286 memset((void *)&r_old, 0, sizeof(r_old));
287 r_old.encrypted.incChallengeID = htonl(challengeID + 1);
288 r_old.encrypted.level = htonl((afs_int32) tcp->level);
289 r_old.kvno = htonl(tcp->kvno);
290 r_old.ticketLen = htonl(tcp->ticketLen);
291 fc_ecb_encrypt(&r_old.encrypted, &r_old.encrypted, tcp->keysched,
293 response = (char *)&r_old;
294 responseSize = sizeof(r_old);
297 if (RX_MAX_PACKET_DATA_SIZE < responseSize + tcp->ticketLen)
298 return RXKADPACKETSHORT; /* not enough space */
300 rx_computelen(apacket, missing);
301 missing = responseSize + tcp->ticketLen - missing;
303 if (rxi_AllocDataBuf(apacket, missing, RX_PACKET_CLASS_SEND) > 0)
304 return RXKADPACKETSHORT; /* not enough space */
306 /* copy response and ticket into packet */
307 rx_packetwrite(apacket, 0, responseSize, response);
308 rx_packetwrite(apacket, responseSize, tcp->ticketLen, tcp->ticket);
310 rx_SetDataSize(apacket, responseSize + tcp->ticketLen);
315 rxkad_ResetState(void)
319 rxkad_EpochWasSet = 0;