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 31 #include <sys/cdefs.h> 32 /* 33 * Copyright (C) 1986, Sun Microsystems, Inc. 34 */ 35 36 /* 37 * Command to change one's public key in the public key database 38 */ 39 #include <rpc/rpc.h> 40 #include <rpc/key_prot.h> 41 #ifdef YP 42 #include <rpcsvc/yp_prot.h> 43 #include <rpcsvc/ypclnt.h> 44 #else 45 #define YPOP_STORE 4 46 #endif 47 #include <sys/fcntl.h> 48 #include <err.h> 49 #include <pwd.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 55 #include "extern.h" 56 57 #ifdef YPPASSWD 58 struct passwd *ypgetpwuid(uid_t); 59 #endif 60 61 #ifdef YP 62 static char *domain; 63 static char PKMAP[] = "publickey.byname"; 64 #else 65 static char PKFILE[] = "/etc/publickey"; 66 #endif /* YP */ 67 static char ROOTKEY[] = "/etc/.rootkey"; 68 69 static void usage(void) __dead2; 70 extern int yp_update(char *, char *, int, char *, size_t, char *, size_t); 71 72 int 73 main(int argc, char **argv) 74 { 75 char name[MAXNETNAMELEN+1]; 76 char public[HEXKEYBYTES + 1]; 77 char secret[HEXKEYBYTES + 1]; 78 char crypt1[HEXKEYBYTES + KEYCHECKSUMSIZE + 1]; 79 char crypt2[HEXKEYBYTES + KEYCHECKSUMSIZE + 1]; 80 int status; 81 char *pass; 82 struct passwd *pw; 83 uid_t uid; 84 int force = 0; 85 int ch; 86 #ifdef YP 87 char *master; 88 #endif 89 #ifdef YPPASSWD 90 char *cryptpw; 91 #endif 92 93 while ((ch = getopt(argc, argv, "f")) != -1) 94 switch(ch) { 95 case 'f': 96 force = 1; 97 break; 98 default: 99 usage(); 100 } 101 argc -= optind; 102 argv += optind; 103 104 if (argc != 0) 105 usage(); 106 107 #ifdef YP 108 (void)yp_get_default_domain(&domain); 109 if (yp_master(domain, PKMAP, &master) != 0) 110 errx(1, "can't find master of publickey database"); 111 #endif 112 uid = getuid() /*geteuid()*/; 113 if (uid == 0) { 114 if (host2netname(name, NULL, NULL) == 0) 115 errx(1, "cannot convert hostname to netname"); 116 } else { 117 if (user2netname(name, uid, NULL) == 0) 118 errx(1, "cannot convert username to netname"); 119 } 120 (void)printf("Generating new key for %s.\n", name); 121 122 if (!force) { 123 if (uid != 0) { 124 #ifdef YPPASSWD 125 pw = ypgetpwuid(uid); 126 #else 127 pw = getpwuid(uid); 128 #endif 129 if (pw == NULL) { 130 #ifdef YPPASSWD 131 errx(1, 132 "no NIS password entry found: can't change key"); 133 #else 134 errx(1, 135 "no password entry found: can't change key"); 136 #endif 137 } 138 } else { 139 pw = getpwuid(0); 140 if (pw == NULL) 141 errx(1, "no password entry found: can't change key"); 142 } 143 } 144 pass = getpass("Password:"); 145 #ifdef YPPASSWD 146 if (!force) { 147 cryptpw = crypt(pass, pw->pw_passwd); 148 if (cryptpw == NULL || strcmp(cryptpw, pw->pw_passwd) != 0) 149 errx(1, "invalid password"); 150 } 151 #else 152 force = 1; /* Make this mandatory */ 153 #endif 154 genkeys(public, secret, pass); 155 156 memcpy(crypt1, secret, HEXKEYBYTES); 157 memcpy(crypt1 + HEXKEYBYTES, secret, KEYCHECKSUMSIZE); 158 crypt1[HEXKEYBYTES + KEYCHECKSUMSIZE] = 0; 159 xencrypt(crypt1, pass); 160 161 if (force) { 162 memcpy(crypt2, crypt1, HEXKEYBYTES + KEYCHECKSUMSIZE + 1); 163 xdecrypt(crypt2, getpass("Retype password:")); 164 if (memcmp(crypt2, crypt2 + HEXKEYBYTES, KEYCHECKSUMSIZE) != 0 165 || memcmp(crypt2, secret, HEXKEYBYTES) != 0) 166 errx(1, "password incorrect"); 167 } 168 169 #ifdef YP 170 (void)printf("Sending key change request to %s...\n", master); 171 #endif 172 status = setpublicmap(name, public, crypt1); 173 if (status != 0) { 174 #ifdef YP 175 errx(1, "unable to update NIS database (%u): %s", 176 status, yperr_string(status)); 177 #else 178 errx(1, "unable to update publickey database"); 179 #endif 180 } 181 182 if (uid == 0) { 183 /* 184 * Root users store their key in /etc/$ROOTKEY so 185 * that they can auto reboot without having to be 186 * around to type a password. Storing this in a file 187 * is rather dubious: it should really be in the EEPROM 188 * so it does not go over the net. 189 */ 190 int fd; 191 192 fd = open(ROOTKEY, O_WRONLY|O_TRUNC|O_CREAT, 0); 193 if (fd < 0) { 194 warn("%s", ROOTKEY); 195 } else { 196 char newline = '\n'; 197 198 if (write(fd, secret, strlen(secret)) < 0 || 199 write(fd, &newline, sizeof(newline)) < 0) 200 warn("%s: write", ROOTKEY); 201 } 202 close(fd); 203 } 204 205 if (key_setsecret(secret) < 0) 206 errx(1, "unable to login with new secret key"); 207 (void)printf("Done.\n"); 208 exit(0); 209 /* NOTREACHED */ 210 } 211 212 static void 213 usage(void) 214 { 215 (void)fprintf(stderr, "usage: chkey [-f]\n"); 216 exit(1); 217 /* NOTREACHED */ 218 } 219 220 221 /* 222 * Set the entry in the public key file 223 */ 224 int 225 setpublicmap(char *name, char *public, char *secret) 226 { 227 char pkent[1024]; 228 229 (void)sprintf(pkent,"%s:%s", public, secret); 230 #ifdef YP 231 return (yp_update(domain, PKMAP, YPOP_STORE, 232 name, strlen(name), pkent, strlen(pkent))); 233 #else 234 return (localupdate(name, PKFILE, YPOP_STORE, 235 strlen(name), name, strlen(pkent), pkent)); 236 #endif 237 } 238 239 #ifdef YPPASSWD 240 struct passwd * 241 ypgetpwuid(uid_t uid) 242 { 243 char uidstr[10]; 244 char *val; 245 int vallen; 246 static struct passwd pw; 247 char *p; 248 249 (void)sprintf(uidstr, "%d", uid); 250 if (yp_match(domain, "passwd.byuid", uidstr, strlen(uidstr), 251 &val, &vallen) != 0) { 252 return (NULL); 253 } 254 p = strchr(val, ':'); 255 if (p == NULL) { 256 return (NULL); 257 } 258 pw.pw_passwd = p + 1; 259 p = strchr(pw.pw_passwd, ':'); 260 if (p == NULL) { 261 return (NULL); 262 } 263 *p = 0; 264 return (&pw); 265 } 266 #endif /* YPPASSWD */ 267