File: qmail-users.c

package info (click to toggle)
cvm 0.97-0.1
  • links: PTS
  • area: main
  • in suites: buster
  • size: 1,036 kB
  • sloc: ansic: 4,065; sh: 2,758; makefile: 235; sql: 15
file content (199 lines) | stat: -rw-r--r-- 5,070 bytes parent folder | download | duplicates (4)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
/* qmail-users.c - qmail users/cdb lookup routines
 * Copyright (C) 2010  Bruce Guenter <bruce@untroubled.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <bglibs/sysdeps.h>
#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>

#include <bglibs/cdb.h>
#include <bglibs/cdb.h>
#include <bglibs/iobuf.h>
#include <bglibs/str.h>

#include "qmail.h"

static str users_path;
static int users_fd = -1;
static struct cdb users_cdb;
static struct stat users_stat;

int qmail_users_reinit(void)
{
  struct stat s;
  /* If we can see the users CDB file... */
  if (stat(users_path.s, &s) != -1) {
    /* If it was either not open or has changed since the last open... */
    if (users_fd == -1 ||
	s.st_ino != users_stat.st_ino ||
	s.st_mtime != users_stat.st_mtime ||
	s.st_size != users_stat.st_size) {
      /* If it was previously open, close it */
      if (users_fd != -1) {
	close(users_fd);
	cdb_free(&users_cdb);
      }
      /* And re-open it */
      if ((users_fd = open(users_path.s, O_RDONLY)) != -1) {
	fstat(users_fd, &users_stat);
	cdb_init(&users_cdb, users_fd);
      }
    }
  }
  else if (users_fd != -1) {
    close(users_fd);
    cdb_free(&users_cdb);
    users_fd = -1;
  }
  return 0;
}

int qmail_users_init(void)
{
  if (!str_copy2s(&users_path, qmail_root, "/users/cdb"))
    return -1;
  return qmail_users_reinit();
}

static int lookup_userscdb(struct qmail_user* u,
			   str* name, char dash)
{
  char* ptr;
  const char* end;
  const char* user;
  const char* home;
  int i;

  if (!str_spliceb(name, 0, 0, "!", 1)
      || (name->len > 1 && !str_catc(name, dash))) {
    errno = ENOMEM;
    return -1;
  }

  if ((i = cdb_get(&users_cdb, name, name)) <= 0)
    return i;

  /* name now contains:
   * user NUL uid NUL gid NUL home NUL dash NUL ext
   */
  errno = EDOM;
  ptr = name->s;
  end = name->s + name->len;
  user = ptr;
  if ((ptr += strlen(ptr) + 1) >= end) return -1;
  u->uid = strtoul(ptr, &ptr, 10);
  if (*ptr++ != 0 || ptr >= end) return -1;
  u->gid = strtoul(ptr, &ptr, 10);
  if (*ptr++ != 0 || ptr >= end) return -1;
  home = ptr;
  if ((ptr += strlen(ptr) + 1) >= end) return -1;
  if ((u->dash = *ptr) != 0) ++ptr;
  if (*ptr++ != 0 || ptr > end) return -1;

  if (!str_copys(&u->user, user)
      || !str_copys(&u->homedir, home)
      || !str_copyb(&u->ext, ptr, end-ptr)) {
    errno = ENOMEM;
    return -1;
  }

  return 1;
}

static int lookup_passwd(struct qmail_user* u, const str* namestr, char dash)
{
  const struct passwd* pw;
  const char* name;

  if (*(name = namestr->s) == 0)
    name = "alias";
  if ((pw = getpwnam(name)) == 0)
    return (errno == ETXTBSY) ? -1 : 0;

  if (!str_copys(&u->user, pw->pw_name)
      || !str_copys(&u->homedir, pw->pw_dir)
      || !str_copys(&u->ext, "")) {
    errno = ENOMEM;
    return -1;
  }
  u->uid = pw->pw_uid;
  u->gid = pw->pw_gid;
  u->dash = dash;
  return 1;
}

int qmail_users_lookup(struct qmail_user* u, const char* name, char dash)
{
  static str lname;
  if (!str_copys(&lname, name)){
    errno = ENOMEM;
    return -1;
  }
  str_lower(&lname);
  if (users_fd != -1) {
    switch (lookup_userscdb(u, &lname, dash)) {
    case -1: return -1;
    case 0: break;
    default: return 1;
    }
    if (!str_copys(&lname, name)){
      errno = ENOMEM;
      return -1;
    }
  }
  return lookup_passwd(u, &lname, dash);
}

int qmail_users_lookup_split(struct qmail_user* u, const char* name,
			     str* local, str* ext)
{
  static str account;
  int i;

  /* Check if the name is a base UNIX user. */
  if (!str_copys(local, name)) return -1;
  if (!str_copys(ext, "")) return -1;
  switch (qmail_users_lookup(u, name, 0)) {
  case -1: return -1;
  case 0:  break;
  default: return 1;
  }

  /* Now, look for increasingly shorter base-ext pairs */
  if (!str_copy(&account, local)) return -1;
  i = account.len;
  while (i > 0 && (i = str_findprev(&account, '-', i-1)) != -1) {
    if (!str_copyb(local, account.s, i)) return -1;
    if (!str_copyb(ext, account.s+i+1, account.len-i-1)) return -1;
    switch (qmail_users_lookup(u, local->s, '-')) {
    case -1: return -1;
    case 0: continue;
    default: return 1;
    }
  }

  switch (qmail_users_lookup(u, "", '-')) {
  case -1: return -1;
  case 0: return 0;
  }
  str_copyb(local, "", 0);
  if (!str_copy(ext, &account)) return -1;
  return 1;
}