masqmail
view src/local.c @ 426:d48d3622b64f
Updated AUTHORS and THANKS files.
| author | markus schnalke <meillo@marmaro.de> |
|---|---|
| date | Wed, 30 May 2012 11:49:40 +0200 |
| parents | b27f66555ba8 |
| children |
line source
1 /*
2 ** MasqMail
3 ** Copyright (C) 1999-2001 Oliver Kurth
4 ** Copyright (C) 2010 markus schnalke <meillo@marmaro.de>
5 **
6 ** This program is free software; you can redistribute it and/or modify
7 ** it under the terms of the GNU General Public License as published by
8 ** the Free Software Foundation; either version 2 of the License, or
9 ** (at your option) any later version.
10 **
11 ** This program is distributed in the hope that it will be useful,
12 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
13 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 ** GNU General Public License for more details.
15 **
16 ** You should have received a copy of the GNU General Public License
17 ** along with this program; if not, write to the Free Software
18 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 */
21 #include <sys/wait.h>
22 #include <sys/stat.h>
24 #include "masqmail.h"
25 #include "peopen.h"
27 static void
28 message_stream(FILE *out, message *msg, GList *hdr_list, guint flags)
29 {
30 time_t now = time(NULL);
31 GList *node;
33 if (flags & MSGSTR_FROMLINE) {
34 fprintf(out, "From <%s@%s> %s", msg->return_path->local_part,
35 msg->return_path->domain, ctime(&now));
36 }
38 foreach(hdr_list, node) {
39 header *hdr = (header *) (node->data);
40 fputs(hdr->header, out);
41 }
42 putc('\n', out);
43 foreach(msg->data_list, node) {
44 /* From hack: */
45 if (flags & MSGSTR_FROMHACK) {
46 if (strncmp(node->data, "From ", 5) == 0)
47 putc('>', out);
48 }
49 fputs(node->data, out);
50 }
51 putc('\n', out);
52 }
54 gboolean
55 append_file(message *msg, GList *hdr_list, gchar *user)
56 {
57 struct passwd *pw;
58 gboolean ok = FALSE;
59 uid_t saved_uid = geteuid();
60 gid_t saved_gid = getegid();
61 gboolean uid_ok = TRUE, gid_ok = TRUE;
62 gchar *filename;
63 FILE *out;
65 /* headers may be special for a local delivery */
66 if (!hdr_list)
67 hdr_list = msg->hdr_list;
69 if (!(pw = getpwnam(user))) {
70 logwrite(LOG_ALERT, "could not find password entry for "
71 "user %s\n", user);
72 errno = ENOENT; /* getpwnam does not set errno correctly */
73 return FALSE;
74 }
76 if (!conf.run_as_user) {
77 uid_ok = (seteuid(0) == 0);
78 if (uid_ok) {
79 gid_ok = (setegid(conf.mail_gid) == 0);
80 uid_ok = (seteuid(pw->pw_uid) == 0);
81 }
82 if (!uid_ok || !gid_ok) {
83 logwrite(LOG_ALERT, "could not set uid or gid for "
84 "local delivery, uid = %d: %s\n",
85 pw->pw_uid, strerror(errno));
86 return FALSE;
87 }
88 }
90 DEBUG(5) debugf("running as euid %d, egid %d\n", geteuid(), getegid());
92 filename = g_strdup_printf("%s/%s", conf.mail_dir, user);
93 if (!(out = fopen(filename, "a"))) {
94 logwrite(LOG_ALERT, "could not open file %s: %s\n",
95 filename, strerror(errno));
96 } else {
97 #ifdef USE_LIBLOCKFILE
98 gint err;
99 /* lock file using liblockfile */
100 err = maillock(user, 3);
101 if (err == 0) {
102 #else
103 /* lock file: */
104 struct flock lock;
105 lock.l_type = F_WRLCK;
106 lock.l_whence = SEEK_END;
107 lock.l_start = lock.l_len = 0;
108 if (fcntl(fileno(out), F_SETLK, &lock) != -1) {
109 #endif
110 fchmod(fileno(out), 0600);
111 message_stream(out, msg, hdr_list,
112 MSGSTR_FROMLINE | MSGSTR_FROMHACK);
113 ok = TRUE;
115 /* close when still user */
116 fclose(out);
117 #ifdef USE_LIBLOCKFILE
118 mailunlock();
119 #endif
120 } else {
121 fclose(out);
122 #ifdef USE_LIBLOCKFILE
123 DEBUG(3) debugf("could not lock file %s: error %d\n",
124 filename, err);
125 } /* XEmacs indenting convenience... */
126 #else
127 DEBUG(3) debugf("could not lock file %s: %s\n",
128 filename, strerror(errno));
129 }
130 #endif
131 }
132 g_free(filename);
134 if (!conf.run_as_user) {
135 uid_ok = (seteuid(0) == 0);
136 if (uid_ok) {
137 gid_ok = (setegid(saved_gid) == 0);
138 uid_ok = (seteuid(saved_uid) == 0);
139 }
140 }
142 if (!uid_ok || !gid_ok) {
143 /*
144 ** FIXME: if this fails we HAVE to exit, because we shall
145 ** not run with some users id. But we do not return, and so
146 ** this message will not be finished, so the user will get
147 ** the message again next time a delivery is attempted...
148 */
149 logwrite(LOG_ALERT, "could not set back uid or gid after "
150 "local delivery: %s\n", strerror(errno));
151 logwrite(LOG_ALERT, "uid=%d, gid=%d, euid=%d, egid=%d, "
152 "want = %d, %d\n", getuid(), getgid(),
153 geteuid(), getegid(), saved_uid, saved_gid);
154 logwrite(LOG_ALERT, "In case of trouble, see "
155 "local.c:append_file() for details.\n",
156 strerror(errno));
157 exit(1);
158 }
159 return ok;
160 }
162 gboolean
163 pipe_out(message *msg, GList *hdr_list, address *rcpt, gchar *cmd, guint flags)
164 {
165 gchar *envp[40];
166 FILE *out;
167 uid_t saved_uid = geteuid();
168 gid_t saved_gid = getegid();
169 gboolean ok = FALSE;
170 gint i, n;
171 pid_t pid;
172 void (*old_signal) (int);
173 int status;
174 address *ancestor = addr_find_ancestor(rcpt);
176 /* set uid and gid to the mail ids */
177 if (!conf.run_as_user) {
178 set_euidgid(conf.mail_uid, conf.mail_gid,
179 &saved_uid, &saved_gid);
180 }
182 /* set environment */
183 n = 0;
184 envp[n++] = g_strdup_printf("SENDER=%s@%s",
185 msg->return_path->local_part,
186 msg->return_path->domain);
187 envp[n++] = g_strdup_printf("SENDER_DOMAIN=%s",
188 msg->return_path->domain);
189 envp[n++] = g_strdup_printf("SENDER_LOCAL=%s",
190 msg->return_path->local_part);
191 envp[n++] = g_strdup_printf("RECEIVED_HOST=%s",
192 msg->received_host ? msg->received_host : "");
194 envp[n++] = g_strdup_printf("RETURN_PATH=%s@%s",
195 msg->return_path->local_part,
196 msg->return_path->domain);
197 envp[n++] = g_strdup_printf("DOMAIN=%s",
198 ancestor->domain);
200 envp[n++] = g_strdup_printf("LOCAL_PART=%s", ancestor->local_part);
201 envp[n++] = g_strdup_printf("USER=%s", ancestor->local_part);
202 envp[n++] = g_strdup_printf("LOGNAME=%s", ancestor->local_part);
204 envp[n++] = g_strdup_printf("MESSAGE_ID=%s", msg->uid);
205 envp[n++] = g_strdup_printf("QUALIFY_DOMAIN=%s", conf.host_name);
207 envp[n] = NULL;
209 old_signal = signal(SIGCHLD, SIG_DFL);
211 out = peidopen(cmd, "w", envp, &pid, conf.mail_uid, conf.mail_gid);
212 if (!out) {
213 logwrite(LOG_ALERT, "could not open pipe '%s': %s\n",
214 cmd, strerror(errno));
215 } else {
216 message_stream(out, msg, hdr_list, flags);
218 fclose(out);
220 waitpid(pid, &status, 0);
222 if (WEXITSTATUS(status) != 0) {
223 int exstat = WEXITSTATUS(status);
224 logwrite(LOG_ALERT, "process returned %d (%s)\n",
225 exstat, ext_strerror(1024 + exstat));
226 errno = 1024 + exstat;
227 } else if (WIFSIGNALED(status)) {
228 logwrite(LOG_ALERT, "process got signal %d\n",
229 WTERMSIG(status));
230 } else
231 ok = TRUE;
233 }
235 signal(SIGCHLD, old_signal);
237 /* free environment */
238 for (i = 0; i < n; i++) {
239 g_free(envp[i]);
240 }
242 /* set uid and gid back */
243 if (!conf.run_as_user) {
244 set_euidgid(saved_uid, saved_gid, NULL, NULL);
245 }
247 return ok;
248 }