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. */
16 #include "../afs/param.h"
17 #include "../afs/stds.h"
19 #include "../h/types.h"
20 #include "../h/time.h"
21 #ifdef AFS_LINUX20_ENV
22 #include "../h/socket.h"
24 #include "../netinet/in.h"
26 #include "../afs/sysincludes.h"
28 #ifndef AFS_LINUX22_ENV
29 #include "../rpc/types.h"
30 #include "../rpc/xdr.h"
35 #include <afs/param.h>
37 #include <sys/types.h>
42 #include <netinet/in.h>
46 #ifdef AFS_PTHREAD_ENV
47 #include "../rxkad/rxkad.h"
48 #endif /* AFS_PTHREAD_ENV */
52 #include "private_data.h"
53 #define XPRT_RXKAD_CLIENT
58 #define max(a,b) ((a) < (b)? (b) : (a))
61 static struct rx_securityOps rxkad_client_ops = {
63 rxkad_NewConnection, /* every new connection */
64 rxkad_PreparePacket, /* once per packet creation */
65 0, /* send packet (once per retrans.) */
69 rxkad_GetResponse, /* respond to challenge packet */
71 rxkad_CheckPacket, /* check data packet */
72 rxkad_DestroyConnection,
79 /* To minimize changes to epoch, we set this Cuid once, and everyone (including
80 * rxnull) uses it after that. This means that the Ksession of the first
81 * authencticated connection should be a good one. */
83 #ifdef AFS_PTHREAD_ENV
85 * This mutex protects the following global variables:
91 pthread_mutex_t rxkad_client_uid_mutex;
92 #define LOCK_CUID assert(pthread_mutex_lock(&rxkad_client_uid_mutex)==0);
93 #define UNLOCK_CUID assert(pthread_mutex_unlock(&rxkad_client_uid_mutex)==0);
97 #endif /* AFS_PTHREAD_ENV */
99 static afs_int32 Cuid[2]; /* set once and shared by all */
100 int rxkad_EpochWasSet = 0; /* TRUE => we called rx_SetEpoch */
102 /* allocate a new connetion ID in place */
103 rxkad_AllocCID(aobj, aconn)
104 struct rx_securityClass *aobj;
105 struct rx_connection *aconn;
107 struct rxkad_cprivate *tcp;
108 struct rxkad_cidgen tgen;
109 static afs_int32 counter = 0; /* not used anymore */
114 tgen.ipAddr = rxi_getaddr(); /* comes back in net order */
115 clock_GetTime(&tgen.time); /* changes time1 and time2 */
116 tgen.time.sec = htonl(tgen.time.sec);
117 tgen.time.usec = htonl(tgen.time.usec);
118 tgen.counter = htonl(counter++);
120 tgen.random1 = afs_random() & 0x7fffffff; /* was "80000" */
121 tgen.random2 = afs_random() & 0x7fffffff; /* was "htonl(100)" */
123 tgen.random1 = htonl(getpid());
124 tgen.random2 = htonl(100);
127 /* block is ready for encryption with session key, let's go for it. */
128 tcp = (struct rxkad_cprivate *) aobj->privateData;
129 bcopy((void *)tcp->ivec, (void *)xor, 2*sizeof(afs_int32));
130 fc_cbc_encrypt((char *) &tgen, (char *) &tgen, sizeof(tgen),
131 tcp->keysched, xor, ENCRYPT);
133 /* Create a session key so that we can encrypt it */
136 bcopy(((char *)&tgen) + sizeof(tgen) - ENCRYPTIONBLOCKSIZE,
137 (void *)Cuid, ENCRYPTIONBLOCKSIZE);
138 Cuid[0] = (Cuid[0] & ~0x40000000) | 0x80000000;
139 Cuid[1] &= RX_CIDMASK;
140 rx_SetEpoch (Cuid[0]); /* for future rxnull connections */
148 aconn->epoch = Cuid[0];
149 aconn->cid = Cuid[1];
150 Cuid[1] += 1<<RX_CIDSHIFT;
155 /* Allocate a new client security object. Called with the encryption level,
156 * the session key and the ticket for the other side obtained from the
157 * AuthServer. Refers to export control to determine level. */
159 struct rx_securityClass *
160 rxkad_NewClientSecurityObject(level, sessionkey, kvno, ticketLen, ticket)
162 struct ktc_encryptionKey *sessionkey;
166 { struct rx_securityClass *tsc;
167 struct rxkad_cprivate *tcp;
171 size = sizeof(struct rx_securityClass);
172 tsc = (struct rx_securityClass *) rxi_Alloc (size);
173 bzero ((void *)tsc, size);
174 tsc->refCount = 1; /* caller gets one for free */
175 tsc->ops = &rxkad_client_ops;
177 size = sizeof(struct rxkad_cprivate);
178 tcp = (struct rxkad_cprivate *) rxi_Alloc (size);
179 bzero ((void *)tcp, size);
180 tsc->privateData = (char *) tcp;
181 tcp->type |= rxkad_client;
183 code = fc_keysched (sessionkey, tcp->keysched);
184 if (code) return 0; /* bad key */
185 bcopy ((void *)sessionkey, (void *)tcp->ivec, sizeof(tcp->ivec));
186 tcp->kvno = kvno; /* key version number */
187 tcp->ticketLen = ticketLen; /* length of ticket */
188 bcopy(ticket, tcp->ticket, ticketLen);
191 rxkad_stats_clientObjects++;
196 /* client: respond to a challenge packet */
198 rxs_return_t rxkad_GetResponse (aobj, aconn, apacket)
199 IN struct rx_securityClass *aobj;
200 IN struct rx_packet *apacket;
201 IN struct rx_connection *aconn;
202 { struct rxkad_cprivate *tcp;
204 int v2; /* whether server is old style or v2 */
205 afs_int32 challengeID;
208 int responseSize, missing;
209 struct rxkad_v2ChallengeResponse r_v2;
210 struct rxkad_oldChallengeResponse r_old;
212 tcp = (struct rxkad_cprivate *) aobj->privateData;
214 if (!(tcp->type & rxkad_client)) return RXKADINCONSISTENCY;
216 v2 = (rx_Contiguous(apacket) > sizeof(struct rxkad_oldChallenge));
217 tp = rx_DataOf(apacket);
219 if (v2) { /* v2 challenge */
220 struct rxkad_v2Challenge *c_v2;
221 if (rx_GetDataSize(apacket) < sizeof(struct rxkad_v2Challenge))
222 return RXKADPACKETSHORT;
223 c_v2 = (struct rxkad_v2Challenge *)tp;
224 challengeID = ntohl(c_v2->challengeID);
225 level = ntohl(c_v2->level);
226 } else { /* old format challenge */
227 struct rxkad_oldChallenge *c_old;
228 if (rx_GetDataSize(apacket) < sizeof(struct rxkad_oldChallenge))
229 return RXKADPACKETSHORT;
230 c_old = (struct rxkad_oldChallenge *)tp;
231 challengeID = ntohl(c_old->challengeID);
232 level = ntohl(c_old->level);
235 if (level > tcp->level) return RXKADLEVELFAIL;
237 rxkad_stats.challenges[rxkad_LevelIndex(tcp->level)]++;
243 bzero ((void *)&r_v2, sizeof(r_v2));
244 r_v2.version = htonl(RXKAD_CHALLENGE_PROTOCOL_VERSION);
246 (void) rxkad_SetupEndpoint (aconn, &r_v2.encrypted.endpoint);
247 (void) rxi_GetCallNumberVector (aconn, r_v2.encrypted.callNumbers);
248 for (i=0; i<RX_MAXCALLS; i++) {
249 if (r_v2.encrypted.callNumbers[i] < 0) return RXKADINCONSISTENCY;
250 r_v2.encrypted.callNumbers[i] = htonl(r_v2.encrypted.callNumbers[i]);
252 r_v2.encrypted.incChallengeID = htonl(challengeID + 1);
253 r_v2.encrypted.level = htonl((afs_int32)tcp->level);
254 r_v2.kvno = htonl(tcp->kvno);
255 r_v2.ticketLen = htonl(tcp->ticketLen);
256 r_v2.encrypted.endpoint.cksum = rxkad_CksumChallengeResponse (&r_v2);
257 bcopy((void *)tcp->ivec, (void *)xor, 2*sizeof(afs_int32));
258 fc_cbc_encrypt (&r_v2.encrypted, &r_v2.encrypted,
259 sizeof(r_v2.encrypted), tcp->keysched, xor, ENCRYPT);
260 response = (char *)&r_v2;
261 responseSize = sizeof(r_v2);
263 bzero ((void *)&r_old, sizeof(r_old));
264 r_old.encrypted.incChallengeID = htonl(challengeID + 1);
265 r_old.encrypted.level = htonl((afs_int32)tcp->level);
266 r_old.kvno = htonl(tcp->kvno);
267 r_old.ticketLen = htonl(tcp->ticketLen);
268 fc_ecb_encrypt (&r_old.encrypted, &r_old.encrypted, tcp->keysched, ENCRYPT);
269 response = (char *)&r_old;
270 responseSize = sizeof(r_old);
273 if (RX_MAX_PACKET_DATA_SIZE < responseSize + tcp->ticketLen)
274 return RXKADPACKETSHORT; /* not enough space */
276 rx_computelen(apacket, missing);
277 missing = responseSize + tcp->ticketLen - missing;
279 if (rxi_AllocDataBuf(apacket, missing) > 0)
280 return RXKADPACKETSHORT; /* not enough space */
282 /* copy response and ticket into packet */
283 rx_packetwrite(apacket, 0, responseSize, response);
284 rx_packetwrite(apacket, responseSize, tcp->ticketLen, tcp->ticket);
286 rx_SetDataSize (apacket, responseSize + tcp->ticketLen);