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>
15 #include <afs/param.h>
22 #if defined(AFS_AIX_ENV) || defined(AFS_AUX_ENV) || defined(AFS_SUN5_ENV) || defined(AFS_XBSD_ENV)
25 #ifdef AFS_LINUX20_ENV
29 #include "netinet/in.h"
32 #include "afs/sysincludes.h"
36 #ifdef AFS_PTHREAD_ENV
38 #endif /* AFS_PTHREAD_ENV */
45 #include "private_data.h"
46 #define XPRT_RXKAD_CLIENT
49 #define max(a,b) ((a) < (b)? (b) : (a))
52 static struct rx_securityOps rxkad_client_ops = {
54 rxkad_NewConnection, /* every new connection */
55 rxkad_PreparePacket, /* once per packet creation */
56 0, /* send packet (once per retrans.) */
60 rxkad_GetResponse, /* respond to challenge packet */
62 rxkad_CheckPacket, /* check data packet */
63 rxkad_DestroyConnection,
70 /* To minimize changes to epoch, we set this Cuid once, and everyone (including
71 * rxnull) uses it after that. This means that the Ksession of the first
72 * authencticated connection should be a good one. */
74 #ifdef AFS_PTHREAD_ENV
76 * This mutex protects the following global variables:
81 pthread_mutex_t rxkad_client_uid_mutex;
82 #define LOCK_CUID osi_Assert(pthread_mutex_lock(&rxkad_client_uid_mutex)==0)
83 #define UNLOCK_CUID osi_Assert(pthread_mutex_unlock(&rxkad_client_uid_mutex)==0)
87 #endif /* AFS_PTHREAD_ENV */
89 static afs_int32 Cuid[2]; /* set once and shared by all */
90 int rxkad_EpochWasSet = 0; /* TRUE => we called rx_SetEpoch */
92 /* allocate a new connetion ID in place */
94 rxkad_AllocCID(struct rx_securityClass *aobj, struct rx_connection *aconn)
96 struct rxkad_cprivate *tcp;
97 struct rxkad_cidgen tgen;
98 static afs_int32 counter = 0; /* not used anymore */
103 tgen.ipAddr = rxi_getaddr(); /* comes back in net order */
104 clock_GetTime(&tgen.time); /* changes time1 and time2 */
105 tgen.time.sec = htonl(tgen.time.sec);
106 tgen.time.usec = htonl(tgen.time.usec);
107 tgen.counter = htonl(counter);
110 tgen.random1 = afs_random() & 0x7fffffff; /* was "80000" */
111 tgen.random2 = afs_random() & 0x7fffffff; /* was "htonl(100)" */
113 tgen.random1 = htonl(getpid());
114 tgen.random2 = htonl(100);
117 /* block is ready for encryption with session key, let's go for it. */
118 tcp = (struct rxkad_cprivate *)aobj->privateData;
119 memcpy((void *)xor, (void *)tcp->ivec, 2 * sizeof(afs_int32));
120 fc_cbc_encrypt((char *)&tgen, (char *)&tgen, sizeof(tgen),
121 tcp->keysched, xor, ENCRYPT);
123 /* Create a session key so that we can encrypt it */
127 ((char *)&tgen) + sizeof(tgen) - ENCRYPTIONBLOCKSIZE,
128 ENCRYPTIONBLOCKSIZE);
129 Cuid[0] = (Cuid[0] & ~0x40000000) | 0x80000000;
130 Cuid[1] &= RX_CIDMASK;
131 rx_SetEpoch(Cuid[0]); /* for future rxnull connections */
139 aconn->epoch = Cuid[0];
140 aconn->cid = Cuid[1];
141 Cuid[1] += 1 << RX_CIDSHIFT;
146 /* Allocate a new client security object. Called with the encryption level,
147 * the session key and the ticket for the other side obtained from the
148 * AuthServer. Refers to export control to determine level. */
150 struct rx_securityClass *
151 rxkad_NewClientSecurityObject(rxkad_level level,
152 struct ktc_encryptionKey *sessionkey,
153 afs_int32 kvno, int ticketLen, char *ticket)
155 struct rx_securityClass *tsc;
156 struct rxkad_cprivate *tcp;
160 size = sizeof(struct rx_securityClass);
161 tsc = rxi_Alloc(size);
162 memset((void *)tsc, 0, size);
163 tsc->refCount = 1; /* caller gets one for free */
164 tsc->ops = &rxkad_client_ops;
166 psize = PDATA_SIZE(ticketLen);
167 tcp = rxi_Alloc(psize);
168 memset((void *)tcp, 0, psize);
169 tsc->privateData = (char *)tcp;
170 tcp->type |= rxkad_client;
172 code = fc_keysched(sessionkey, tcp->keysched);
174 rxi_Free(tcp, psize);
175 rxi_Free(tsc, sizeof(struct rx_securityClass));
176 return 0; /* bad key */
178 memcpy((void *)tcp->ivec, (void *)sessionkey, sizeof(tcp->ivec));
179 tcp->kvno = kvno; /* key version number */
180 tcp->ticketLen = ticketLen; /* length of ticket */
181 if (tcp->ticketLen > MAXKTCTICKETLEN) {
182 rxi_Free(tcp, psize);
183 rxi_Free(tsc, sizeof(struct rx_securityClass));
184 return 0; /* bad key */
186 memcpy(tcp->ticket, ticket, ticketLen);
188 INC_RXKAD_STATS(clientObjects);
192 /* client: respond to a challenge packet */
195 rxkad_GetResponse(struct rx_securityClass *aobj, struct rx_connection *aconn,
196 struct rx_packet *apacket)
198 struct rxkad_cprivate *tcp;
200 int v2; /* whether server is old style or v2 */
201 afs_int32 challengeID;
204 int responseSize, missing;
205 struct rxkad_v2ChallengeResponse r_v2;
206 struct rxkad_oldChallengeResponse r_old;
208 tcp = (struct rxkad_cprivate *)aobj->privateData;
210 if (!(tcp->type & rxkad_client))
211 return RXKADINCONSISTENCY;
213 v2 = (rx_Contiguous(apacket) > sizeof(struct rxkad_oldChallenge));
214 tp = rx_DataOf(apacket);
216 if (v2) { /* v2 challenge */
217 struct rxkad_v2Challenge *c_v2;
218 if (rx_GetDataSize(apacket) < sizeof(struct rxkad_v2Challenge))
219 return RXKADPACKETSHORT;
220 c_v2 = (struct rxkad_v2Challenge *)tp;
221 challengeID = ntohl(c_v2->challengeID);
222 level = ntohl(c_v2->level);
223 } else { /* old format challenge */
224 struct rxkad_oldChallenge *c_old;
225 if (rx_GetDataSize(apacket) < sizeof(struct rxkad_oldChallenge))
226 return RXKADPACKETSHORT;
227 c_old = (struct rxkad_oldChallenge *)tp;
228 challengeID = ntohl(c_old->challengeID);
229 level = ntohl(c_old->level);
232 if (level > tcp->level)
233 return RXKADLEVELFAIL;
234 INC_RXKAD_STATS(challenges[rxkad_LevelIndex(tcp->level)]);
238 memset((void *)&r_v2, 0, sizeof(r_v2));
239 r_v2.version = htonl(RXKAD_CHALLENGE_PROTOCOL_VERSION);
241 (void)rxkad_SetupEndpoint(aconn, &r_v2.encrypted.endpoint);
242 (void)rxi_GetCallNumberVector(aconn, r_v2.encrypted.callNumbers);
243 for (i = 0; i < RX_MAXCALLS; i++) {
244 if (r_v2.encrypted.callNumbers[i] < 0)
245 return RXKADINCONSISTENCY;
246 r_v2.encrypted.callNumbers[i] =
247 htonl(r_v2.encrypted.callNumbers[i]);
249 r_v2.encrypted.incChallengeID = htonl(challengeID + 1);
250 r_v2.encrypted.level = htonl((afs_int32) tcp->level);
251 r_v2.kvno = htonl(tcp->kvno);
252 r_v2.ticketLen = htonl(tcp->ticketLen);
253 r_v2.encrypted.endpoint.cksum = rxkad_CksumChallengeResponse(&r_v2);
254 memcpy((void *)xor, (void *)tcp->ivec, 2 * sizeof(afs_int32));
255 fc_cbc_encrypt(&r_v2.encrypted, &r_v2.encrypted,
256 sizeof(r_v2.encrypted), tcp->keysched, xor, ENCRYPT);
257 response = (char *)&r_v2;
258 responseSize = sizeof(r_v2);
260 memset((void *)&r_old, 0, sizeof(r_old));
261 r_old.encrypted.incChallengeID = htonl(challengeID + 1);
262 r_old.encrypted.level = htonl((afs_int32) tcp->level);
263 r_old.kvno = htonl(tcp->kvno);
264 r_old.ticketLen = htonl(tcp->ticketLen);
265 fc_ecb_encrypt(&r_old.encrypted, &r_old.encrypted, tcp->keysched,
267 response = (char *)&r_old;
268 responseSize = sizeof(r_old);
271 if (RX_MAX_PACKET_DATA_SIZE < responseSize + tcp->ticketLen)
272 return RXKADPACKETSHORT; /* not enough space */
274 rx_computelen(apacket, missing);
275 missing = responseSize + tcp->ticketLen - missing;
277 if (rxi_AllocDataBuf(apacket, missing, RX_PACKET_CLASS_SEND) > 0)
278 return RXKADPACKETSHORT; /* not enough space */
280 /* copy response and ticket into packet */
281 rx_packetwrite(apacket, 0, responseSize, response);
282 rx_packetwrite(apacket, responseSize, tcp->ticketLen, tcp->ticket);
284 rx_SetDataSize(apacket, responseSize + tcp->ticketLen);
289 rxkad_ResetState(void)
293 rxkad_EpochWasSet = 0;