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Annotation of 43BSDReno/old/athena/kpasswd/kpasswdd.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1989 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #ifndef lint
        !            19: static char sccsid[] = "@(#)kpasswdd.c 1.2 (Berkeley) 5/17/89";
        !            20: #endif /* not lint */
        !            21: 
        !            22: /*
        !            23:  * kpasswdd - update a principal's passwd field in the Kerberos
        !            24:  *           database.  Called from inetd.
        !            25:  * K. Fall
        !            26:  * 12-Dec-88
        !            27:  */
        !            28: 
        !            29: #include <stdio.h>
        !            30: #include <sys/types.h>
        !            31: #include <sys/time.h>
        !            32: #include <syslog.h>
        !            33: #include <kerberos/krb.h>
        !            34: #include <kerberos/krb_db.h>
        !            35: #include <sys/resource.h>
        !            36: #include <sys/signal.h>
        !            37: #include <netinet/in.h>
        !            38: #include "kpasswd_proto.h"
        !            39: 
        !            40: static struct kpasswd_data     kpwd_data;
        !            41: static C_Block                 master_key, key;
        !            42: static Key_schedule            master_key_schedule,
        !            43:                                key_schedule, random_sched;
        !            44: int                            mkeyversion;
        !            45: AUTH_DAT                       kdata;
        !            46: static Principal               principal_data;
        !            47: static struct update_data      ud_data;
        !            48: 
        !            49: char                           inst[INST_SZ];
        !            50: char                           version[9];
        !            51: KTEXT_ST                       ticket;
        !            52: 
        !            53: char   *progname;              /* for the library */
        !            54: 
        !            55: main()
        !            56: {
        !            57:        struct  sockaddr_in     foreign;
        !            58:        int                     foreign_len = sizeof(foreign);
        !            59:        int                     rval, more;
        !            60:        static  char    name[] = "kpasswdd";
        !            61: 
        !            62:        static  struct rlimit   rl = { 0, 0 };
        !            63: 
        !            64:        progname = name;
        !            65:        openlog("kpasswdd", LOG_CONS | LOG_PID, LOG_AUTH);
        !            66: 
        !            67:        signal(SIGHUP, SIG_IGN);
        !            68:        signal(SIGINT, SIG_IGN);
        !            69:        signal(SIGTSTP, SIG_IGN);
        !            70:        if(setrlimit(RLIMIT_CORE, &rl) < 0) {
        !            71:                syslog(LOG_ERR, "setrlimit: %m");
        !            72:                exit(1);
        !            73:        }
        !            74: 
        !            75:        if(getpeername(0, &foreign, &foreign_len) < 0) {
        !            76:                syslog(LOG_ERR,"getpeername: %m");
        !            77:                exit(1);
        !            78:        }
        !            79: 
        !            80:        strcpy(inst, "*");
        !            81:        rval = krb_recvauth(
        !            82:                0L,                             /* !MUTUAL */
        !            83:                0,                              /* file desc */
        !            84:                &ticket,                        /* client's ticket */
        !            85:                SERVICE,                        /* expected service */
        !            86:                inst,                           /* expected instance */
        !            87:                &foreign,                       /* foreign addr */
        !            88:                (struct sockaddr_in *) 0,       
        !            89:                &kdata,
        !            90:                "",
        !            91:                (bit_64 *) NULL,                /* key schedule */
        !            92:                version
        !            93:        );
        !            94: 
        !            95: 
        !            96:        if(rval != KSUCCESS) {
        !            97:                syslog(LOG_ERR, "krb_recvauth: %s", krb_err_txt[rval]);
        !            98:                cleanup();
        !            99:                exit(1);
        !           100:        }
        !           101: 
        !           102: 
        !           103:        /* get master key */
        !           104:        if(kdb_get_master_key(0, master_key, master_key_schedule) != 0) {
        !           105:                syslog(LOG_ERR, "couldn't get master key");
        !           106:                cleanup();
        !           107:                exit(1);
        !           108:        }
        !           109: 
        !           110:        mkeyversion = 
        !           111:           kdb_get_master_key(master_key, master_key_schedule, NULL);
        !           112: 
        !           113: 
        !           114:        if(mkeyversion < 0) {
        !           115:                syslog(LOG_NOTICE, "couldn't verify master key");
        !           116:                cleanup();
        !           117:                exit(1);
        !           118:        }
        !           119: 
        !           120:        /* get principal info */
        !           121:        rval = kerb_get_principal(
        !           122:                kdata.pname,
        !           123:                kdata.pinst,
        !           124:                &principal_data,
        !           125:                1,
        !           126:                &more
        !           127:        );
        !           128: 
        !           129:        if(rval != 1 || (more != 0)) {
        !           130:                syslog(LOG_NOTICE, "more than 1 entry for %s.%s",
        !           131:                        kdata.pname, kdata.pinst);
        !           132:                cleanup();
        !           133:                exit(1);
        !           134:        }
        !           135: 
        !           136:        /* get the user's key */
        !           137: 
        !           138:        bcopy(&principal_data.key_low, key, 4);
        !           139:        bcopy(&principal_data.key_high, ((long *) key) + 1, 4);
        !           140:        kdb_encrypt_key(key, key, master_key, master_key_schedule,
        !           141:                DECRYPT);
        !           142:        key_sched(key, key_schedule);
        !           143:        des_set_key(key, key_schedule);
        !           144: 
        !           145: 
        !           146:        /* get random key and send it over {random} Kperson */
        !           147: 
        !           148:        random_key(kpwd_data.random_key);
        !           149:        strcpy(kpwd_data.secure_msg, SECURE_STRING);
        !           150:        if(des_write(0, &kpwd_data, sizeof(kpwd_data)) != sizeof(kpwd_data)) {
        !           151:                syslog(LOG_ERR, "error writing initial data");
        !           152:                cleanup();
        !           153:                exit(1);
        !           154:        }
        !           155: 
        !           156:        bzero(key, sizeof(key));
        !           157:        bzero(key_schedule, sizeof(key_schedule));
        !           158: 
        !           159:        /* now read update info: { info }Krandom */
        !           160: 
        !           161:        key_sched(kpwd_data.random_key, random_sched);
        !           162:        des_set_key(kpwd_data.random_key, random_sched);
        !           163:        if(des_read(0, &ud_data, sizeof(ud_data)) != sizeof(ud_data)) {
        !           164:                syslog(LOG_ERR, "update aborted");
        !           165:                cleanup();
        !           166:                exit(1);
        !           167:        }
        !           168: 
        !           169:        /* validate info string by looking at the embedded string */
        !           170: 
        !           171:        if(strcmp(ud_data.secure_msg, SECURE_STRING)) {
        !           172:                syslog(LOG_NOTICE, "invalid update from %s",
        !           173:                        inet_ntoa(foreign.sin_addr));
        !           174:                cleanup();
        !           175:                exit(1);
        !           176:        }
        !           177: 
        !           178:        /* produce the new key entry in the database { key }Kmaster */
        !           179:        string_to_key(ud_data.pw, key);
        !           180:        kdb_encrypt_key(key, key,
        !           181:                master_key, master_key_schedule,
        !           182:                ENCRYPT);
        !           183:        bcopy(key, &principal_data.key_low, 4);
        !           184:        bcopy(((long *) key) + 1,
        !           185:                &principal_data.key_high, 4);
        !           186:        bzero(key, sizeof(key));
        !           187:        principal_data.key_version++;
        !           188:        if(kerb_put_principal(&principal_data, 1)) {
        !           189:                syslog(LOG_ERR, "couldn't write new record for %s.%s",
        !           190:                        principal_data.name, principal_data.instance);
        !           191:                cleanup();
        !           192:                exit(1);
        !           193:        }
        !           194: 
        !           195:        syslog(LOG_NOTICE,"wrote new password field for %s.%s from %s",
        !           196:                principal_data.name,
        !           197:                principal_data.instance,
        !           198:                inet_ntoa(foreign.sin_addr)
        !           199:        );
        !           200: 
        !           201:        send_ack(0, "Update complete.\n");
        !           202:        cleanup();
        !           203:        exit(0);
        !           204: }
        !           205: 
        !           206: cleanup()
        !           207: {
        !           208:        bzero(&kpwd_data, sizeof(kpwd_data));
        !           209:        bzero(master_key, sizeof(master_key));
        !           210:        bzero(master_key_schedule, sizeof(master_key_schedule));
        !           211:        bzero(key, sizeof(key));
        !           212:        bzero(key_schedule, sizeof(key_schedule));
        !           213:        bzero(random_sched, sizeof(random_sched));
        !           214:        bzero(&principal_data, sizeof(principal_data));
        !           215:        bzero(&ud_data, sizeof(ud_data));
        !           216: }
        !           217: 
        !           218: send_ack(remote, msg)
        !           219:        int     remote;
        !           220:        char    *msg;
        !           221: {
        !           222:        int     cc;
        !           223:        cc = des_write(remote, msg, strlen(msg) + 1);
        !           224:        if(cc <= 0) {
        !           225:                syslog(LOG_ERR, "error writing ack");
        !           226:                cleanup();
        !           227:                exit(1);
        !           228:        }
        !           229: }

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