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 #include <pwd.h>
31 #include <grp.h>
32 #include <libutil.h>
33 #include <stdio.h>
34 #include <string.h>
35 #include <stdlib.h>
36 #include <err.h>
37 #include <unistd.h>
38
39 #include "pwupd.h"
40
41 static FILE * pwd_fp = NULL;
42 static int pwd_scanflag;
43 static const char *pwd_filename;
44
45 void
vendpwent(void)46 vendpwent(void)
47 {
48 if (pwd_fp != NULL) {
49 fclose(pwd_fp);
50 pwd_fp = NULL;
51 }
52 }
53
54 void
vsetpwent(void)55 vsetpwent(void)
56 {
57 vendpwent();
58 }
59
60 static struct passwd *
vnextpwent(char const * nam,uid_t uid,int doclose)61 vnextpwent(char const *nam, uid_t uid, int doclose)
62 {
63 struct passwd *pw;
64 char *line;
65 size_t linecap;
66 ssize_t linelen;
67
68 pw = NULL;
69 line = NULL;
70 linecap = 0;
71
72 if (pwd_fp == NULL) {
73 if (geteuid() == 0) {
74 pwd_filename = _MASTERPASSWD;
75 pwd_scanflag = PWSCAN_MASTER;
76 } else {
77 pwd_filename = _PASSWD;
78 pwd_scanflag = 0;
79 }
80 pwd_fp = fopen(getpwpath(pwd_filename), "r");
81 }
82
83 if (pwd_fp != NULL) {
84 while ((linelen = getline(&line, &linecap, pwd_fp)) > 0) {
85 /* Skip comments and empty lines */
86 if (*line == '\n' || *line == '#')
87 continue;
88 /* trim latest \n */
89 if (line[linelen - 1 ] == '\n')
90 line[linelen - 1] = '\0';
91 pw = pw_scan(line, pwd_scanflag);
92 if (pw == NULL)
93 errx(EXIT_FAILURE, "Invalid user entry in '%s':"
94 " '%s'", getpwpath(pwd_filename), line);
95 if (uid != (uid_t)-1) {
96 if (uid == pw->pw_uid)
97 break;
98 } else if (nam != NULL) {
99 if (strcmp(nam, pw->pw_name) == 0)
100 break;
101 } else
102 break;
103 free(pw);
104 pw = NULL;
105 }
106 if (doclose)
107 vendpwent();
108 }
109 free(line);
110
111 return (pw);
112 }
113
114 struct passwd *
vgetpwent(void)115 vgetpwent(void)
116 {
117 return vnextpwent(NULL, -1, 0);
118 }
119
120 struct passwd *
vgetpwuid(uid_t uid)121 vgetpwuid(uid_t uid)
122 {
123 return vnextpwent(NULL, uid, 1);
124 }
125
126 struct passwd *
vgetpwnam(const char * nam)127 vgetpwnam(const char * nam)
128 {
129 return vnextpwent(nam, -1, 1);
130 }
131
132
133 static FILE * grp_fp = NULL;
134
135 void
vendgrent(void)136 vendgrent(void)
137 {
138 if (grp_fp != NULL) {
139 fclose(grp_fp);
140 grp_fp = NULL;
141 }
142 }
143
144 void
vsetgrent(void)145 vsetgrent(void)
146 {
147 vendgrent();
148 }
149
150 static struct group *
vnextgrent(char const * nam,gid_t gid,int doclose)151 vnextgrent(char const *nam, gid_t gid, int doclose)
152 {
153 struct group *gr;
154 char *line;
155 size_t linecap;
156 ssize_t linelen;
157
158 gr = NULL;
159 line = NULL;
160 linecap = 0;
161
162 if (grp_fp != NULL || (grp_fp = fopen(getgrpath(_GROUP), "r")) != NULL) {
163 while ((linelen = getline(&line, &linecap, grp_fp)) > 0) {
164 /* Skip comments and empty lines */
165 if (*line == '\n' || *line == '#')
166 continue;
167 /* trim latest \n */
168 if (line[linelen - 1 ] == '\n')
169 line[linelen - 1] = '\0';
170 gr = gr_scan(line);
171 if (gr == NULL)
172 errx(EXIT_FAILURE, "Invalid group entry in '%s':"
173 " '%s'", getgrpath(_GROUP), line);
174 if (gid != (gid_t)-1) {
175 if (gid == gr->gr_gid)
176 break;
177 } else if (nam != NULL) {
178 if (strcmp(nam, gr->gr_name) == 0)
179 break;
180 } else
181 break;
182 free(gr);
183 gr = NULL;
184 }
185 if (doclose)
186 vendgrent();
187 }
188 free(line);
189
190 return (gr);
191 }
192
193 struct group *
vgetgrent(void)194 vgetgrent(void)
195 {
196 return vnextgrent(NULL, -1, 0);
197 }
198
199
200 struct group *
vgetgrgid(gid_t gid)201 vgetgrgid(gid_t gid)
202 {
203 return vnextgrent(NULL, gid, 1);
204 }
205
206 struct group *
vgetgrnam(const char * nam)207 vgetgrnam(const char * nam)
208 {
209 return vnextgrent(nam, -1, 1);
210 }
211
212