1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (C) 1996 5 * David L. Nugent. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 */ 29 30 #ifndef lint 31 static const char rcsid[] = 32 "$FreeBSD$"; 33 #endif /* not lint */ 34 35 #include <pwd.h> 36 #include <grp.h> 37 #include <libutil.h> 38 #include <stdio.h> 39 #include <string.h> 40 #include <stdlib.h> 41 #include <err.h> 42 #include <unistd.h> 43 44 #include "pwupd.h" 45 46 static FILE * pwd_fp = NULL; 47 static int pwd_scanflag; 48 static const char *pwd_filename; 49 50 void 51 vendpwent(void) 52 { 53 if (pwd_fp != NULL) { 54 fclose(pwd_fp); 55 pwd_fp = NULL; 56 } 57 } 58 59 void 60 vsetpwent(void) 61 { 62 vendpwent(); 63 } 64 65 static struct passwd * 66 vnextpwent(char const *nam, uid_t uid, int doclose) 67 { 68 struct passwd *pw; 69 char *line; 70 size_t linecap; 71 ssize_t linelen; 72 73 pw = NULL; 74 line = NULL; 75 linecap = 0; 76 77 if (pwd_fp == NULL) { 78 if (geteuid() == 0) { 79 pwd_filename = _MASTERPASSWD; 80 pwd_scanflag = PWSCAN_MASTER; 81 } else { 82 pwd_filename = _PASSWD; 83 pwd_scanflag = 0; 84 } 85 pwd_fp = fopen(getpwpath(pwd_filename), "r"); 86 } 87 88 if (pwd_fp != NULL) { 89 while ((linelen = getline(&line, &linecap, pwd_fp)) > 0) { 90 /* Skip comments and empty lines */ 91 if (*line == '\n' || *line == '#') 92 continue; 93 /* trim latest \n */ 94 if (line[linelen - 1 ] == '\n') 95 line[linelen - 1] = '\0'; 96 pw = pw_scan(line, pwd_scanflag); 97 if (pw == NULL) 98 errx(EXIT_FAILURE, "Invalid user entry in '%s':" 99 " '%s'", getpwpath(pwd_filename), line); 100 if (uid != (uid_t)-1) { 101 if (uid == pw->pw_uid) 102 break; 103 } else if (nam != NULL) { 104 if (strcmp(nam, pw->pw_name) == 0) 105 break; 106 } else 107 break; 108 free(pw); 109 pw = NULL; 110 } 111 if (doclose) 112 vendpwent(); 113 } 114 free(line); 115 116 return (pw); 117 } 118 119 struct passwd * 120 vgetpwent(void) 121 { 122 return vnextpwent(NULL, -1, 0); 123 } 124 125 struct passwd * 126 vgetpwuid(uid_t uid) 127 { 128 return vnextpwent(NULL, uid, 1); 129 } 130 131 struct passwd * 132 vgetpwnam(const char * nam) 133 { 134 return vnextpwent(nam, -1, 1); 135 } 136 137 138 static FILE * grp_fp = NULL; 139 140 void 141 vendgrent(void) 142 { 143 if (grp_fp != NULL) { 144 fclose(grp_fp); 145 grp_fp = NULL; 146 } 147 } 148 149 void 150 vsetgrent(void) 151 { 152 vendgrent(); 153 } 154 155 static struct group * 156 vnextgrent(char const *nam, gid_t gid, int doclose) 157 { 158 struct group *gr; 159 char *line; 160 size_t linecap; 161 ssize_t linelen; 162 163 gr = NULL; 164 line = NULL; 165 linecap = 0; 166 167 if (grp_fp != NULL || (grp_fp = fopen(getgrpath(_GROUP), "r")) != NULL) { 168 while ((linelen = getline(&line, &linecap, grp_fp)) > 0) { 169 /* Skip comments and empty lines */ 170 if (*line == '\n' || *line == '#') 171 continue; 172 /* trim latest \n */ 173 if (line[linelen - 1 ] == '\n') 174 line[linelen - 1] = '\0'; 175 gr = gr_scan(line); 176 if (gr == NULL) 177 errx(EXIT_FAILURE, "Invalid group entry in '%s':" 178 " '%s'", getgrpath(_GROUP), line); 179 if (gid != (gid_t)-1) { 180 if (gid == gr->gr_gid) 181 break; 182 } else if (nam != NULL) { 183 if (strcmp(nam, gr->gr_name) == 0) 184 break; 185 } else 186 break; 187 free(gr); 188 gr = NULL; 189 } 190 if (doclose) 191 vendgrent(); 192 } 193 free(line); 194 195 return (gr); 196 } 197 198 struct group * 199 vgetgrent(void) 200 { 201 return vnextgrent(NULL, -1, 0); 202 } 203 204 205 struct group * 206 vgetgrgid(gid_t gid) 207 { 208 return vnextgrent(NULL, gid, 1); 209 } 210 211 struct group * 212 vgetgrnam(const char * nam) 213 { 214 return vnextgrent(nam, -1, 1); 215 } 216 217