masqmail

view src/local.c @ 310:f10a56dc7481

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reworked online_detect to the simpler online_query Only pipe is supported now. Use online_query="/bin/cat /path/to/file" instead of online_detect=file online_file=/path/to/file and online_query="/path/to/some/script foo" instead of online_detect=pipe online_pipe="/path/to/some/script foo" See man page masqmail.conf(5) and admin/config-transition.
author meillo@marmaro.de
date Sun, 24 Apr 2011 19:14:38 +0200
parents 996b53a50f55
children 63efd381e27b
line source
1 /* MasqMail
2 Copyright (C) 1999-2001 Oliver Kurth
3 Copyright (C) 2010 markus schnalke <meillo@marmaro.de>
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
19
20 #include <sys/wait.h>
21 #include <sys/stat.h>
22
23 #include "masqmail.h"
24 #include "peopen.h"
25
26 static void
27 message_stream(FILE * out, message * msg, GList * hdr_list, guint flags)
28 {
29 time_t now = time(NULL);
30 GList *node;
31
32 if (flags & MSGSTR_FROMLINE) {
33 fprintf(out, "From <%s@%s> %s", msg->return_path->local_part, msg->return_path->domain, ctime(&now));
34 }
35
36 foreach(hdr_list, node) {
37 header *hdr = (header *) (node->data);
38 fputs(hdr->header, out);
39 }
40 putc('\n', out);
41 foreach(msg->data_list, node) {
42 /* From hack: */
43 if (flags & MSGSTR_FROMHACK) {
44 if (strncmp(node->data, "From ", 5) == 0)
45 putc('>', out);
46 }
47 fputs(node->data, out);
48 }
49 putc('\n', out);
50 }
51
52 gboolean
53 append_file(message * msg, GList * hdr_list, gchar * user)
54 {
55 struct passwd *pw;
56 gboolean ok = FALSE;
57
58 /* headers may be special for a local delivery */
59 if (hdr_list == NULL)
60 hdr_list = msg->hdr_list;
61
62 if ((pw = getpwnam(user))) {
63 uid_t saved_uid = geteuid();
64 gid_t saved_gid = getegid();
65 gboolean uid_ok = TRUE, gid_ok = TRUE;
66
67 if (!conf.run_as_user) {
68 uid_ok = (seteuid(0) == 0);
69 if (uid_ok) {
70 gid_ok = (setegid(conf.mail_gid) == 0);
71 uid_ok = (seteuid(pw->pw_uid) == 0);
72 }
73 }
74
75 DEBUG(5) debugf("running as euid %d, egid %d\n", geteuid(), getegid());
76
77 if (uid_ok && gid_ok) {
78 gchar *filename;
79 FILE *out;
80
81 filename = g_strdup_printf("%s/%s", conf.mail_dir, user);
82 if ((out = fopen(filename, "a"))) {
83 #ifdef USE_LIBLOCKFILE
84 gint err;
85 /* lock file using liblockfile */
86 err = maillock(user, 3);
87 if (err == 0) {
88 #else
89 /* lock file: */
90 struct flock lock;
91 lock.l_type = F_WRLCK;
92 lock.l_whence = SEEK_END;
93 lock.l_start = lock.l_len = 0;
94 if (fcntl(fileno(out), F_SETLK, &lock) != -1) {
95 #endif
96 fchmod(fileno(out), 0600);
97 message_stream(out, msg, hdr_list, MSGSTR_FROMLINE | MSGSTR_FROMHACK);
98 ok = TRUE;
99
100 /* close when still user */
101 fclose(out);
102 #ifdef USE_LIBLOCKFILE
103 mailunlock();
104 #endif
105 } else {
106 fclose(out);
107 #ifdef USE_LIBLOCKFILE
108 DEBUG(3) debugf("could not lock file %s: error %d\n", filename, err);
109 } /* XEmacs indenting convenience... */
110 #else
111 DEBUG(3) debugf("could not lock file %s: %s\n", filename, strerror(errno));
112 }
113 #endif
114 } else {
115 logwrite(LOG_ALERT, "could not open file %s: %s\n", filename, strerror(errno));
116 }
117 g_free(filename);
118
119 if (!conf.run_as_user) {
120 uid_ok = (seteuid(0) == 0);
121 if (uid_ok) {
122 gid_ok = (setegid(saved_gid) == 0);
123 uid_ok = (seteuid(saved_uid) == 0);
124 }
125 }
126
127 if (!uid_ok || !gid_ok) {
128 /* FIXME: if this fails we HAVE to exit, because we shall not run
129 with some users id. But we do not return, and so this message
130 will not be finished, so the user will get the message again
131 next time a delivery is attempted... */
132 logwrite(LOG_ALERT, "could not set back uid or gid after local delivery: %s\n", strerror(errno));
133 logwrite(LOG_ALERT, "uid=%d, gid=%d, euid=%d, egid=%d, want = %d, %d\n",
134 getuid(), getgid(), geteuid(), getegid(), saved_uid, saved_gid);
135 exit(1);
136 }
137 } else {
138 logwrite(LOG_ALERT, "could not set uid or gid for local delivery, uid = %d: %s\n", pw->pw_uid, strerror(errno));
139 }
140 } else {
141 logwrite(LOG_ALERT, "could not find password entry for user %s\n", user);
142 errno = ENOENT; /* getpwnam does not set errno correctly */
143 }
144
145 return ok;
146 }
147
148 gboolean
149 pipe_out(message * msg, GList * hdr_list, address * rcpt, gchar * cmd, guint flags)
150 {
151 gchar *envp[40];
152 FILE *out;
153 uid_t saved_uid = geteuid();
154 gid_t saved_gid = getegid();
155 gboolean ok = FALSE;
156 gint i, n;
157 pid_t pid;
158 void (*old_signal) (int);
159 int status;
160
161 /* set uid and gid to the mail ids */
162 if (!conf.run_as_user) {
163 set_euidgid(conf.mail_uid, conf.mail_gid, &saved_uid, &saved_gid);
164 }
165
166 /* set environment */
167 {
168 gint i = 0;
169 address *ancestor = addr_find_ancestor(rcpt);
170
171 envp[i++] = g_strdup_printf("SENDER=%s@%s", msg->return_path->local_part, msg->return_path->domain);
172 envp[i++] = g_strdup_printf("SENDER_DOMAIN=%s", msg->return_path->domain);
173 envp[i++] = g_strdup_printf("SENDER_LOCAL=%s", msg->return_path->local_part);
174 envp[i++] = g_strdup_printf("RECEIVED_HOST=%s", msg->received_host ? msg->received_host : "");
175
176 envp[i++] = g_strdup_printf("RETURN_PATH=%s@%s", msg->return_path->local_part, msg->return_path->domain);
177 envp[i++] = g_strdup_printf("DOMAIN=%s", ancestor->domain);
178
179 envp[i++] = g_strdup_printf("LOCAL_PART=%s", ancestor->local_part);
180 envp[i++] = g_strdup_printf("USER=%s", ancestor->local_part);
181 envp[i++] = g_strdup_printf("LOGNAME=%s", ancestor->local_part);
182
183 envp[i++] = g_strdup_printf("MESSAGE_ID=%s", msg->uid);
184 envp[i++] = g_strdup_printf("QUALIFY_DOMAIN=%s", conf.host_name);
185
186 envp[i] = NULL;
187 n = i;
188 }
189
190 old_signal = signal(SIGCHLD, SIG_DFL);
191
192 out = peidopen(cmd, "w", envp, &pid, conf.mail_uid, conf.mail_gid);
193 if (out != NULL) {
194 message_stream(out, msg, hdr_list, flags);
195
196 fclose(out);
197
198 waitpid(pid, &status, 0);
199
200 if (WEXITSTATUS(status) != 0) {
201 int exstat = WEXITSTATUS(status);
202 logwrite(LOG_ALERT, "process returned %d (%s)\n", exstat, ext_strerror(1024 + exstat));
203 errno = 1024 + exstat;
204 } else if (WIFSIGNALED(status)) {
205 logwrite(LOG_ALERT, "process got signal %d\n", WTERMSIG(status));
206 } else
207 ok = TRUE;
208
209 } else
210 logwrite(LOG_ALERT, "could not open pipe '%s': %s\n", cmd, strerror(errno));
211
212 signal(SIGCHLD, old_signal);
213
214 /* free environment */
215 for (i = 0; i < n; i++) {
216 g_free(envp[i]);
217 }
218
219 /* set uid and gid back */
220 if (!conf.run_as_user) {
221 set_euidgid(saved_uid, saved_gid, NULL, NULL);
222 }
223
224 return ok;
225 }