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 #ifdef AFS_LINUX20_ENV
32 #include "netinet/in.h"
35 #include "afs/sysincludes.h"
37 #ifndef AFS_LINUX22_ENV
38 #include "rpc/types.h"
44 #include <sys/types.h>
56 #include <netinet/in.h>
60 #ifdef AFS_PTHREAD_ENV
61 #include "rxkad/rxkad.h"
62 #endif /* AFS_PTHREAD_ENV */
65 #include "private_data.h"
66 #define XPRT_RXKAD_CLIENT
71 #define max(a,b) ((a) < (b)? (b) : (a))
74 static struct rx_securityOps rxkad_client_ops = {
76 rxkad_NewConnection, /* every new connection */
77 rxkad_PreparePacket, /* once per packet creation */
78 0, /* send packet (once per retrans.) */
82 rxkad_GetResponse, /* respond to challenge packet */
84 rxkad_CheckPacket, /* check data packet */
85 rxkad_DestroyConnection,
92 /* To minimize changes to epoch, we set this Cuid once, and everyone (including
93 * rxnull) uses it after that. This means that the Ksession of the first
94 * authencticated connection should be a good one. */
96 #ifdef AFS_PTHREAD_ENV
98 * This mutex protects the following global variables:
104 pthread_mutex_t rxkad_client_uid_mutex;
105 #define LOCK_CUID assert(pthread_mutex_lock(&rxkad_client_uid_mutex)==0);
106 #define UNLOCK_CUID assert(pthread_mutex_unlock(&rxkad_client_uid_mutex)==0);
110 #endif /* AFS_PTHREAD_ENV */
112 static afs_int32 Cuid[2]; /* set once and shared by all */
113 int rxkad_EpochWasSet = 0; /* TRUE => we called rx_SetEpoch */
115 /* allocate a new connetion ID in place */
116 int 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 */
148 memcpy((void *)Cuid, ((char *)&tgen) + sizeof(tgen) - ENCRYPTIONBLOCKSIZE, 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 *rxkad_NewClientSecurityObject(
171 rxkad_level level, struct ktc_encryptionKey *sessionkey,
172 afs_int32 kvno, int ticketLen, char *ticket)
173 { struct rx_securityClass *tsc;
174 struct rxkad_cprivate *tcp;
178 size = sizeof(struct rx_securityClass);
179 tsc = (struct rx_securityClass *) rxi_Alloc (size);
180 memset((void *)tsc, 0, size);
181 tsc->refCount = 1; /* caller gets one for free */
182 tsc->ops = &rxkad_client_ops;
184 size = sizeof(struct rxkad_cprivate);
185 tcp = (struct rxkad_cprivate *) rxi_Alloc (size);
186 memset((void *)tcp, 0, size);
187 tsc->privateData = (char *) tcp;
188 tcp->type |= rxkad_client;
190 code = fc_keysched (sessionkey, tcp->keysched);
191 if (code) return 0; /* bad key */
192 memcpy((void *)tcp->ivec, (void *)sessionkey, sizeof(tcp->ivec));
193 tcp->kvno = kvno; /* key version number */
194 tcp->ticketLen = ticketLen; /* length of ticket */
195 if (tcp->ticketLen > MAXKTCTICKETLEN) return 0; /* bad key */
196 memcpy(tcp->ticket, ticket, ticketLen);
199 rxkad_stats_clientObjects++;
204 /* client: respond to a challenge packet */
206 int rxkad_GetResponse(struct rx_securityClass *aobj,
207 struct rx_connection *aconn, struct rx_packet *apacket)
208 { struct rxkad_cprivate *tcp;
210 int v2; /* whether server is old style or v2 */
211 afs_int32 challengeID;
214 int responseSize, missing;
215 struct rxkad_v2ChallengeResponse r_v2;
216 struct rxkad_oldChallengeResponse r_old;
218 tcp = (struct rxkad_cprivate *) aobj->privateData;
220 if (!(tcp->type & rxkad_client)) return RXKADINCONSISTENCY;
222 v2 = (rx_Contiguous(apacket) > sizeof(struct rxkad_oldChallenge));
223 tp = rx_DataOf(apacket);
225 if (v2) { /* v2 challenge */
226 struct rxkad_v2Challenge *c_v2;
227 if (rx_GetDataSize(apacket) < sizeof(struct rxkad_v2Challenge))
228 return RXKADPACKETSHORT;
229 c_v2 = (struct rxkad_v2Challenge *)tp;
230 challengeID = ntohl(c_v2->challengeID);
231 level = ntohl(c_v2->level);
232 } else { /* old format challenge */
233 struct rxkad_oldChallenge *c_old;
234 if (rx_GetDataSize(apacket) < sizeof(struct rxkad_oldChallenge))
235 return RXKADPACKETSHORT;
236 c_old = (struct rxkad_oldChallenge *)tp;
237 challengeID = ntohl(c_old->challengeID);
238 level = ntohl(c_old->level);
241 if (level > tcp->level) return RXKADLEVELFAIL;
243 rxkad_stats.challenges[rxkad_LevelIndex(tcp->level)]++;
249 memset((void *)&r_v2, 0, sizeof(r_v2));
250 r_v2.version = htonl(RXKAD_CHALLENGE_PROTOCOL_VERSION);
252 (void) rxkad_SetupEndpoint (aconn, &r_v2.encrypted.endpoint);
253 (void) rxi_GetCallNumberVector (aconn, r_v2.encrypted.callNumbers);
254 for (i=0; i<RX_MAXCALLS; i++) {
255 if (r_v2.encrypted.callNumbers[i] < 0) return RXKADINCONSISTENCY;
256 r_v2.encrypted.callNumbers[i] = htonl(r_v2.encrypted.callNumbers[i]);
258 r_v2.encrypted.incChallengeID = htonl(challengeID + 1);
259 r_v2.encrypted.level = htonl((afs_int32)tcp->level);
260 r_v2.kvno = htonl(tcp->kvno);
261 r_v2.ticketLen = htonl(tcp->ticketLen);
262 r_v2.encrypted.endpoint.cksum = rxkad_CksumChallengeResponse (&r_v2);
263 memcpy((void *)xor, (void *)tcp->ivec, 2*sizeof(afs_int32));
264 fc_cbc_encrypt (&r_v2.encrypted, &r_v2.encrypted,
265 sizeof(r_v2.encrypted), tcp->keysched, xor, ENCRYPT);
266 response = (char *)&r_v2;
267 responseSize = sizeof(r_v2);
269 memset((void *)&r_old, 0, sizeof(r_old));
270 r_old.encrypted.incChallengeID = htonl(challengeID + 1);
271 r_old.encrypted.level = htonl((afs_int32)tcp->level);
272 r_old.kvno = htonl(tcp->kvno);
273 r_old.ticketLen = htonl(tcp->ticketLen);
274 fc_ecb_encrypt (&r_old.encrypted, &r_old.encrypted, tcp->keysched, ENCRYPT);
275 response = (char *)&r_old;
276 responseSize = sizeof(r_old);
279 if (RX_MAX_PACKET_DATA_SIZE < responseSize + tcp->ticketLen)
280 return RXKADPACKETSHORT; /* not enough space */
282 rx_computelen(apacket, missing);
283 missing = responseSize + tcp->ticketLen - missing;
285 if (rxi_AllocDataBuf(apacket, missing, RX_PACKET_CLASS_SEND) > 0)
286 return RXKADPACKETSHORT; /* not enough space */
288 /* copy response and ticket into packet */
289 rx_packetwrite(apacket, 0, responseSize, response);
290 rx_packetwrite(apacket, responseSize, tcp->ticketLen, tcp->ticket);
292 rx_SetDataSize (apacket, responseSize + tcp->ticketLen);
296 void rxkad_ResetState(void)