usr.bin/chkey/chkey.c

   1 /*-
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user or with the express written consent of
   8  * Sun Microsystems, Inc.
   9  *
  10  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  11  * WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  12  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  13  *
  14  * Sun RPC is provided with no support and without any obligation on the
  15  * part of Sun Microsystems, Inc. to assist in its use, correction,
  16  * modification or enhancement.
  17  *
  18  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  19  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  20  * OR ANY PART THEREOF.
  21  *
  22  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  23  * or profits or other special, indirect and consequential damages, even if
  24  * Sun has been advised of the possibility of such damages.
  25  *
  26  * Sun Microsystems, Inc.
  27  * 2550 Garcia Avenue
  28  * Mountain View, California  94043
  29  *
  30  * $DragonFly: src/usr.bin/chkey/chkey.c,v 1.6 2008/11/11 18:06:12 pavalos Exp $
  31  * @(#)chkey.c 1.7 91/03/11 Copyr 1986 Sun Micro
  32  */
  33 /*
  34  * Copyright (C) 1986, Sun Microsystems, Inc.
  35  */
  36
  37 /*
  38  * Command to change one's public key in the public key database
  39  */
  40 #include <sys/fcntl.h>
  41 #include <err.h>
  42 #include <pwd.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47
  48 #include <rpc/rpc.h>
  49 #include <rpc/key_prot.h>
  50 #ifdef YP
  51 #include <rpcsvc/yp_prot.h>
  52 #include <rpcsvc/ypclnt.h>
  53 #include <rpcsvc/yppasswd.h>
  54 #else
  55 #define YPOP_STORE      4
  56 #endif
  57
  58 #include "externs.h"
  59
  60 #ifdef YPPASSWD
  61 static struct passwd    *ypgetpwuid(uid_t);
  62 #endif
  63
  64 #ifdef YP
  65 static char *domain;
  66 static char PKMAP[] = "publickey.byname";
  67 #else
  68 static char PKFILE[] = "/etc/publickey";
  69 #endif  /* YP */
  70 static char ROOTKEY[] = "/etc/.rootkey";
  71
  72 static void     usage(void);
  73 static int      setpublicmap(char *, char *, char *);
  74
  75 int
  76 main(int argc, char **argv)
  77 {
  78         char name[MAXNETNAMELEN+1];
  79         char public[HEXKEYBYTES + 1];
  80         char secret[HEXKEYBYTES + 1];
  81         char crypt1[HEXKEYBYTES + KEYCHECKSUMSIZE + 1];
  82         char crypt2[HEXKEYBYTES + KEYCHECKSUMSIZE + 1];
  83         int status;
  84         char *pass;
  85         struct passwd *pw;
  86         uid_t uid;
  87         int force = 0;
  88         int ch;
  89 #ifdef YP
  90         char *master;
  91 #endif
  92 #ifdef YPPASSWD
  93         char *cryptpw;
  94 #endif
  95
  96         while ((ch = getopt(argc, argv, "f")) != -1)
  97                 switch(ch) {
  98                 case 'f':
  99                         force = 1;
 100                         break;
 101                 default:
 102                         usage();
 103                 }
 104         argc -= optind;
 105         argv += optind;
 106
 107         if (argc != 0)
 108                 usage();
 109
 110 #ifdef YP
 111         yp_get_default_domain(&domain);
 112         if (yp_master(domain, PKMAP, &master) != 0)
 113                 errx(1, "can't find master of publickey database");
 114 #endif
 115         uid = getuid() /*geteuid()*/;
 116         if (uid == 0) {
 117                 if (host2netname(name, NULL, NULL) == 0)
 118                         errx(1, "cannot convert hostname to netname");
 119         } else {
 120                 if (user2netname(name, uid, NULL) == 0)
 121                         errx(1, "cannot convert username to netname");
 122         }
 123         printf("Generating new key for %s.\n", name);
 124
 125         if (!force) {
 126                 if (uid != 0) {
 127 #ifdef YPPASSWD
 128                         pw = ypgetpwuid(uid);
 129 #else
 130                         pw = getpwuid(uid);
 131 #endif
 132                         if (pw == NULL) {
 133 #ifdef YPPASSWD
 134                                 errx(1,
 135                         "no NIS password entry found: can't change key");
 136 #else
 137                                 errx(1,
 138                         "no password entry found: can't change key");
 139 #endif
 140                         }
 141                 } else {
 142                         pw = getpwuid(0);
 143                         if (pw == NULL)
 144                           errx(1, "no password entry found: can't change key");
 145                 }
 146         }
 147         pass = getpass("Password:");
 148 #ifdef YPPASSWD
 149         if (!force) {
 150                 cryptpw = crypt(pass, pw->pw_passwd);
 151                 if (cryptpw == NULL || strcmp(cryptpw, pw->pw_passwd) != 0)
 152                         errx(1, "invalid password");
 153         }
 154 #else
 155         force = 1;      /* Make this mandatory */
 156 #endif
 157         genkeys(public, secret, pass);
 158
 159         memcpy(crypt1, secret, HEXKEYBYTES);
 160         memcpy(crypt1 + HEXKEYBYTES, secret, KEYCHECKSUMSIZE);
 161         crypt1[HEXKEYBYTES + KEYCHECKSUMSIZE] = 0;
 162         xencrypt(crypt1, pass);
 163
 164         if (force) {
 165                 memcpy(crypt2, crypt1, HEXKEYBYTES + KEYCHECKSUMSIZE + 1);
 166                 xdecrypt(crypt2, getpass("Retype password:"));
 167                 if (memcmp(crypt2, crypt2 + HEXKEYBYTES, KEYCHECKSUMSIZE) != 0 ||
 168                     memcmp(crypt2, secret, HEXKEYBYTES) != 0)
 169                         errx(1, "password incorrect");
 170         }
 171
 172 #ifdef YP
 173         printf("Sending key change request to %s...\n", master);
 174 #endif
 175         status = setpublicmap(name, public, crypt1);
 176         if (status != 0) {
 177 #ifdef YP
 178                 errx(1, "unable to update NIS database (%u): %s",
 179                                 status, yperr_string(status));
 180 #else
 181                 errx(1, "unable to update publickey database");
 182 #endif
 183         }
 184
 185         if (uid == 0) {
 186                 /*
 187                  * Root users store their key in /etc/$ROOTKEY so
 188                  * that they can auto reboot without having to be
 189                  * around to type a password. Storing this in a file
 190                  * is rather dubious: it should really be in the EEPROM
 191                  * so it does not go over the net.
 192                  */
 193                 int fd;
 194
 195                 fd = open(ROOTKEY, O_WRONLY|O_TRUNC|O_CREAT, 0);
 196                 if (fd < 0) {
 197                         warn("%s", ROOTKEY);
 198                 } else {
 199                         char newline = '\n';
 200
 201                         if (write(fd, secret, strlen(secret)) < 0 ||
 202                             write(fd, &newline, sizeof(newline)) < 0)
 203                                 warn("%s: write", ROOTKEY);
 204                 }
 205         }
 206
 207         if (key_setsecret(secret) < 0)
 208                 errx(1, "unable to login with new secret key");
 209         printf("Done.\n");
 210         exit(0);
 211         /* NOTREACHED */
 212 }
 213
 214 static void
 215 usage(void)
 216 {
 217         fprintf(stderr, "usage: chkey [-f]\n");
 218         exit(1);
 219         /* NOTREACHED */
 220 }
 221
 222
 223 /*
 224  * Set the entry in the public key file
 225  */
 226 static int
 227 setpublicmap(char *name, char *public, char *secret)
 228 {
 229         char pkent[1024];
 230
 231         sprintf(pkent,"%s:%s", public, secret);
 232 #ifdef YP
 233         return (yp_update(domain, PKMAP, YPOP_STORE,
 234                 name, strlen(name), pkent, strlen(pkent)));
 235 #else
 236         return (localupdate(name, PKFILE, YPOP_STORE,
 237                 strlen(name), name, strlen(pkent), pkent));
 238 #endif
 239 }
 240
 241 #ifdef YPPASSWD
 242 static struct passwd *
 243 ypgetpwuid(uid_t uid)
 244 {
 245         char uidstr[10];
 246         char *val;
 247         int vallen;
 248         static struct passwd pw;
 249         char *p;
 250
 251         sprintf(uidstr, "%d", uid);
 252         if (yp_match(domain, "passwd.byuid", uidstr, strlen(uidstr),
 253                         &val, &vallen) != 0) {
 254                 return (NULL);
 255         }
 256         p = strchr(val, ':');
 257         if (p == NULL) {
 258                 return (NULL);
 259         }
 260         pw.pw_passwd = p + 1;
 261         p = strchr(pw.pw_passwd, ':');
 262         if (p == NULL) {
 263                 return (NULL);
 264         }
 265         *p = 0;
 266         return (&pw);
 267 }
 268 #endif  /* YPPASSWD */