1 /*- 2 * Copyright (C) 1996 3 * David L. Nugent. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: src/usr.sbin/pw/pwupd.c,v 1.21 2008/07/17 13:47:59 jhb Exp $ 27 */ 28 29 #include <stdio.h> 30 #include <stdlib.h> 31 #include <string.h> 32 #include <unistd.h> 33 #include <stdarg.h> 34 #include <errno.h> 35 #include <sys/types.h> 36 #include <sys/stat.h> 37 #include <sys/param.h> 38 #include <sys/wait.h> 39 40 #include "pwupd.h" 41 42 #define HAVE_PWDB_C 1 43 #define HAVE_PWDB_U 1 44 45 static char pathpwd[] = _PATH_PWD; 46 static char * pwpath = pathpwd; 47 48 int 49 setpwdir(const char * dir) 50 { 51 if (dir == NULL) 52 return -1; 53 else { 54 char * d = malloc(strlen(dir)+1); 55 if (d == NULL) 56 return -1; 57 pwpath = strcpy(d, dir); 58 } 59 return 0; 60 } 61 62 char * 63 getpwpath(char const * file) 64 { 65 static char pathbuf[MAXPATHLEN]; 66 67 snprintf(pathbuf, sizeof pathbuf, "%s/%s", pwpath, file); 68 return pathbuf; 69 } 70 71 int 72 pwdb(char *arg,...) 73 { 74 int i = 0; 75 pid_t pid; 76 va_list ap; 77 char *args[10]; 78 79 args[i++] = _PATH_PWD_MKDB; 80 va_start(ap, arg); 81 while (i < 6 && arg != NULL) { 82 args[i++] = arg; 83 arg = va_arg(ap, char *); 84 } 85 if (pwpath != pathpwd) { 86 args[i++] = "-d"; 87 args[i++] = pwpath; 88 } 89 args[i++] = getpwpath(_MASTERPASSWD); 90 args[i] = NULL; 91 92 if ((pid = fork()) == -1) /* Error (errno set) */ 93 i = errno; 94 else if (pid == 0) { /* Child */ 95 execv(args[0], args); 96 _exit(1); 97 } else { /* Parent */ 98 waitpid(pid, &i, 0); 99 if (WEXITSTATUS(i)) 100 i = EIO; 101 } 102 return i; 103 } 104 105 int 106 fmtpwentry(char *buf, struct passwd * pwd, int type) 107 { 108 int l; 109 char *pw; 110 111 pw = (type == PWF_MASTER) ? 112 ((pwd->pw_passwd == NULL) ? "" : pwd->pw_passwd) : "*"; 113 114 if (type == PWF_PASSWD) 115 l = sprintf(buf, "%s:*:%ld:%ld:%s:%s:%s\n", 116 pwd->pw_name, (long) pwd->pw_uid, (long) pwd->pw_gid, 117 pwd->pw_gecos ? pwd->pw_gecos : "User &", 118 pwd->pw_dir, pwd->pw_shell); 119 else 120 l = sprintf(buf, "%s:%s:%ld:%ld:%s:%lu:%lu:%s:%s:%s\n", 121 pwd->pw_name, pw, (long) pwd->pw_uid, (long) pwd->pw_gid, 122 pwd->pw_class ? pwd->pw_class : "", 123 (unsigned long) pwd->pw_change, 124 (unsigned long) pwd->pw_expire, 125 pwd->pw_gecos, pwd->pw_dir, pwd->pw_shell); 126 return l; 127 } 128 129 130 int 131 fmtpwent(char *buf, struct passwd * pwd) 132 { 133 return fmtpwentry(buf, pwd, PWF_STANDARD); 134 } 135 136 static int 137 pw_update(struct passwd * pwd, char const * user, int mode) 138 { 139 int rc = 0; 140 141 ENDPWENT(); 142 143 /* 144 * First, let's check the see if the database is alright 145 * Note: -C is only available in FreeBSD 2.2 and above 146 */ 147 #ifdef HAVE_PWDB_C 148 rc = pwdb("-C", NULL); /* Check only */ 149 if (rc == 0) { 150 #else 151 { /* No -C */ 152 #endif 153 char pfx[PWBUFSZ]; 154 char pwbuf[PWBUFSZ]; 155 int l = snprintf(pfx, PWBUFSZ, "%s:", user); 156 #ifdef HAVE_PWDB_U 157 int isrename = pwd!=NULL && strcmp(user, pwd->pw_name); 158 #endif 159 160 /* 161 * Update the passwd file first 162 */ 163 if (pwd == NULL) 164 *pwbuf = '\0'; 165 else 166 fmtpwentry(pwbuf, pwd, PWF_PASSWD); 167 168 if (l < 0) 169 l = 0; 170 rc = fileupdate(getpwpath(_PASSWD), 0644, pwbuf, pfx, l, mode); 171 if (rc == 0) { 172 173 /* 174 * Then the master.passwd file 175 */ 176 if (pwd != NULL) 177 fmtpwentry(pwbuf, pwd, PWF_MASTER); 178 rc = fileupdate(getpwpath(_MASTERPASSWD), 0600, pwbuf, pfx, l, mode); 179 if (rc == 0) { 180 #ifdef HAVE_PWDB_U 181 if (mode == UPD_DELETE || isrename) 182 #endif 183 rc = pwdb(NULL); 184 #ifdef HAVE_PWDB_U 185 else 186 rc = pwdb("-u", user, NULL); 187 #endif 188 } 189 } 190 } 191 return rc; 192 } 193 194 int 195 addpwent(struct passwd * pwd) 196 { 197 return pw_update(pwd, pwd->pw_name, UPD_CREATE); 198 } 199 200 int 201 chgpwent(char const * login, struct passwd * pwd) 202 { 203 return pw_update(pwd, login, UPD_REPLACE); 204 } 205 206 int 207 delpwent(struct passwd * pwd) 208 { 209 return pw_update(NULL, pwd->pw_name, UPD_DELETE); 210 } 211