int rxkad_GetChallenge(struct rx_securityClass *aobj, struct rx_connection *aconn, struct rx_packet *apacket) { struct rxkad_sconn *sconn; char *challenge; int challengeSize; struct rxkad_v2Challenge c_v2; /* version 2 */ struct rxkad_oldChallenge c_old; /* old style */ sconn = (struct rxkad_sconn *)aconn->securityData; if (rx_IsUsingPktCksum(aconn)) sconn->cksumSeen = 1; if (sconn->cksumSeen) { memset(&c_v2, 0, sizeof(c_v2)); c_v2.version = htonl(RXKAD_CHALLENGE_PROTOCOL_VERSION); c_v2.challengeID = htonl(sconn->challengeID); c_v2.level = htonl((afs_int32) sconn->level); c_v2.spare = 0; challenge = (char *)&c_v2; challengeSize = sizeof(c_v2); } else { memset(&c_old, 0, sizeof(c_old)); c_old.challengeID = htonl(sconn->challengeID); c_old.level = htonl((afs_int32) sconn->level); challenge = (char *)&c_old; challengeSize = sizeof(c_old); } if (rx_MyMaxSendSize < challengeSize) return RXKADPACKETSHORT; /* not enough space */ rx_packetwrite(apacket, 0, challengeSize, challenge); rx_SetDataSize(apacket, challengeSize); sconn->tried = 1; INC_RXKAD_STATS(challengesSent); return 0; }
int rxkad_GetResponse(struct rx_securityClass *aobj, struct rx_connection *aconn, struct rx_packet *apacket) { struct rxkad_cprivate *tcp; char *tp; int v2; /* whether server is old style or v2 */ afs_int32 challengeID; rxkad_level level; char *response; int responseSize, missing; struct rxkad_v2ChallengeResponse r_v2; struct rxkad_oldChallengeResponse r_old; tcp = (struct rxkad_cprivate *)aobj->privateData; if (!(tcp->type & rxkad_client)) return RXKADINCONSISTENCY; v2 = (rx_Contiguous(apacket) > sizeof(struct rxkad_oldChallenge)); tp = rx_DataOf(apacket); if (v2) { /* v2 challenge */ struct rxkad_v2Challenge *c_v2; if (rx_GetDataSize(apacket) < sizeof(struct rxkad_v2Challenge)) return RXKADPACKETSHORT; c_v2 = (struct rxkad_v2Challenge *)tp; challengeID = ntohl(c_v2->challengeID); level = ntohl(c_v2->level); } else { /* old format challenge */ struct rxkad_oldChallenge *c_old; if (rx_GetDataSize(apacket) < sizeof(struct rxkad_oldChallenge)) return RXKADPACKETSHORT; c_old = (struct rxkad_oldChallenge *)tp; challengeID = ntohl(c_old->challengeID); level = ntohl(c_old->level); } if (level > tcp->level) return RXKADLEVELFAIL; INC_RXKAD_STATS(challenges[rxkad_LevelIndex(tcp->level)]); if (v2) { int i; afs_uint32 xor[2]; memset((void *)&r_v2, 0, sizeof(r_v2)); r_v2.version = htonl(RXKAD_CHALLENGE_PROTOCOL_VERSION); r_v2.spare = 0; (void)rxkad_SetupEndpoint(aconn, &r_v2.encrypted.endpoint); (void)rxi_GetCallNumberVector(aconn, r_v2.encrypted.callNumbers); for (i = 0; i < RX_MAXCALLS; i++) { if (r_v2.encrypted.callNumbers[i] < 0) return RXKADINCONSISTENCY; r_v2.encrypted.callNumbers[i] = htonl(r_v2.encrypted.callNumbers[i]); } r_v2.encrypted.incChallengeID = htonl(challengeID + 1); r_v2.encrypted.level = htonl((afs_int32) tcp->level); r_v2.kvno = htonl(tcp->kvno); r_v2.ticketLen = htonl(tcp->ticketLen); r_v2.encrypted.endpoint.cksum = rxkad_CksumChallengeResponse(&r_v2); memcpy((void *)xor, (void *)tcp->ivec, 2 * sizeof(afs_int32)); fc_cbc_encrypt(&r_v2.encrypted, &r_v2.encrypted, sizeof(r_v2.encrypted), tcp->keysched, xor, ENCRYPT); response = (char *)&r_v2; responseSize = sizeof(r_v2); } else { memset((void *)&r_old, 0, sizeof(r_old)); r_old.encrypted.incChallengeID = htonl(challengeID + 1); r_old.encrypted.level = htonl((afs_int32) tcp->level); r_old.kvno = htonl(tcp->kvno); r_old.ticketLen = htonl(tcp->ticketLen); fc_ecb_encrypt(&r_old.encrypted, &r_old.encrypted, tcp->keysched, ENCRYPT); response = (char *)&r_old; responseSize = sizeof(r_old); } if (RX_MAX_PACKET_DATA_SIZE < responseSize + tcp->ticketLen) return RXKADPACKETSHORT; /* not enough space */ rx_computelen(apacket, missing); missing = responseSize + tcp->ticketLen - missing; if (missing > 0) if (rxi_AllocDataBuf(apacket, missing, RX_PACKET_CLASS_SEND) > 0) return RXKADPACKETSHORT; /* not enough space */ /* copy response and ticket into packet */ rx_packetwrite(apacket, 0, responseSize, response); rx_packetwrite(apacket, responseSize, tcp->ticketLen, tcp->ticket); rx_SetDataSize(apacket, responseSize + tcp->ticketLen); return 0; }