masqmail

annotate src/local.c @ 315:c98aa884d2cb

find changesets by author, revision, files, or words in the commit message
added comments
author meillo@marmaro.de
date Mon, 25 Apr 2011 15:15:34 +0200
parents 996b53a50f55
children 63efd381e27b
rev   line source
meillo@0 1 /* MasqMail
meillo@0 2 Copyright (C) 1999-2001 Oliver Kurth
meillo@224 3 Copyright (C) 2010 markus schnalke <meillo@marmaro.de>
meillo@0 4
meillo@0 5 This program is free software; you can redistribute it and/or modify
meillo@0 6 it under the terms of the GNU General Public License as published by
meillo@0 7 the Free Software Foundation; either version 2 of the License, or
meillo@0 8 (at your option) any later version.
meillo@0 9
meillo@0 10 This program is distributed in the hope that it will be useful,
meillo@0 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
meillo@0 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
meillo@0 13 GNU General Public License for more details.
meillo@0 14
meillo@0 15 You should have received a copy of the GNU General Public License
meillo@0 16 along with this program; if not, write to the Free Software
meillo@0 17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
meillo@0 18 */
meillo@0 19
meillo@15 20 #include <sys/wait.h>
meillo@169 21 #include <sys/stat.h>
meillo@15 22
meillo@0 23 #include "masqmail.h"
meillo@0 24 #include "peopen.h"
meillo@0 25
meillo@10 26 static void
meillo@10 27 message_stream(FILE * out, message * msg, GList * hdr_list, guint flags)
meillo@0 28 {
meillo@10 29 time_t now = time(NULL);
meillo@10 30 GList *node;
meillo@10 31
meillo@10 32 if (flags & MSGSTR_FROMLINE) {
meillo@10 33 fprintf(out, "From <%s@%s> %s", msg->return_path->local_part, msg->return_path->domain, ctime(&now));
meillo@10 34 }
meillo@10 35
meillo@10 36 foreach(hdr_list, node) {
meillo@10 37 header *hdr = (header *) (node->data);
meillo@10 38 fputs(hdr->header, out);
meillo@10 39 }
meillo@10 40 putc('\n', out);
meillo@10 41 foreach(msg->data_list, node) {
meillo@10 42 /* From hack: */
meillo@10 43 if (flags & MSGSTR_FROMHACK) {
meillo@10 44 if (strncmp(node->data, "From ", 5) == 0)
meillo@10 45 putc('>', out);
meillo@10 46 }
meillo@10 47 fputs(node->data, out);
meillo@10 48 }
meillo@10 49 putc('\n', out);
meillo@0 50 }
meillo@0 51
meillo@10 52 gboolean
meillo@10 53 append_file(message * msg, GList * hdr_list, gchar * user)
meillo@0 54 {
meillo@10 55 struct passwd *pw;
meillo@10 56 gboolean ok = FALSE;
meillo@0 57
meillo@10 58 /* headers may be special for a local delivery */
meillo@10 59 if (hdr_list == NULL)
meillo@10 60 hdr_list = msg->hdr_list;
meillo@0 61
meillo@10 62 if ((pw = getpwnam(user))) {
meillo@10 63 uid_t saved_uid = geteuid();
meillo@10 64 gid_t saved_gid = getegid();
meillo@10 65 gboolean uid_ok = TRUE, gid_ok = TRUE;
meillo@0 66
meillo@10 67 if (!conf.run_as_user) {
meillo@10 68 uid_ok = (seteuid(0) == 0);
meillo@10 69 if (uid_ok) {
meillo@10 70 gid_ok = (setegid(conf.mail_gid) == 0);
meillo@10 71 uid_ok = (seteuid(pw->pw_uid) == 0);
meillo@10 72 }
meillo@10 73 }
meillo@0 74
meillo@114 75 DEBUG(5) debugf("running as euid %d, egid %d\n", geteuid(), getegid());
meillo@0 76
meillo@10 77 if (uid_ok && gid_ok) {
meillo@10 78 gchar *filename;
meillo@10 79 FILE *out;
meillo@10 80
meillo@10 81 filename = g_strdup_printf("%s/%s", conf.mail_dir, user);
meillo@10 82 if ((out = fopen(filename, "a"))) {
meillo@0 83 #ifdef USE_LIBLOCKFILE
meillo@10 84 gint err;
meillo@10 85 /* lock file using liblockfile */
meillo@10 86 err = maillock(user, 3);
meillo@10 87 if (err == 0) {
meillo@0 88 #else
meillo@10 89 /* lock file: */
meillo@10 90 struct flock lock;
meillo@10 91 lock.l_type = F_WRLCK;
meillo@10 92 lock.l_whence = SEEK_END;
meillo@10 93 lock.l_start = lock.l_len = 0;
meillo@10 94 if (fcntl(fileno(out), F_SETLK, &lock) != -1) {
meillo@0 95 #endif
meillo@10 96 fchmod(fileno(out), 0600);
meillo@10 97 message_stream(out, msg, hdr_list, MSGSTR_FROMLINE | MSGSTR_FROMHACK);
meillo@10 98 ok = TRUE;
meillo@10 99
meillo@10 100 /* close when still user */
meillo@10 101 fclose(out);
meillo@0 102 #ifdef USE_LIBLOCKFILE
meillo@10 103 mailunlock();
meillo@0 104 #endif
meillo@10 105 } else {
meillo@10 106 fclose(out);
meillo@0 107 #ifdef USE_LIBLOCKFILE
meillo@10 108 DEBUG(3) debugf("could not lock file %s: error %d\n", filename, err);
meillo@10 109 } /* XEmacs indenting convenience... */
meillo@0 110 #else
meillo@10 111 DEBUG(3) debugf("could not lock file %s: %s\n", filename, strerror(errno));
meillo@10 112 }
meillo@10 113 #endif
meillo@10 114 } else {
meillo@10 115 logwrite(LOG_ALERT, "could not open file %s: %s\n", filename, strerror(errno));
meillo@10 116 }
meillo@10 117 g_free(filename);
meillo@10 118
meillo@10 119 if (!conf.run_as_user) {
meillo@10 120 uid_ok = (seteuid(0) == 0);
meillo@10 121 if (uid_ok) {
meillo@10 122 gid_ok = (setegid(saved_gid) == 0);
meillo@10 123 uid_ok = (seteuid(saved_uid) == 0);
meillo@10 124 }
meillo@10 125 }
meillo@10 126
meillo@10 127 if (!uid_ok || !gid_ok) {
meillo@10 128 /* FIXME: if this fails we HAVE to exit, because we shall not run
meillo@10 129 with some users id. But we do not return, and so this message
meillo@10 130 will not be finished, so the user will get the message again
meillo@10 131 next time a delivery is attempted... */
meillo@10 132 logwrite(LOG_ALERT, "could not set back uid or gid after local delivery: %s\n", strerror(errno));
meillo@10 133 logwrite(LOG_ALERT, "uid=%d, gid=%d, euid=%d, egid=%d, want = %d, %d\n",
meillo@10 134 getuid(), getgid(), geteuid(), getegid(), saved_uid, saved_gid);
meillo@262 135 exit(1);
meillo@10 136 }
meillo@10 137 } else {
meillo@10 138 logwrite(LOG_ALERT, "could not set uid or gid for local delivery, uid = %d: %s\n", pw->pw_uid, strerror(errno));
meillo@10 139 }
meillo@10 140 } else {
meillo@10 141 logwrite(LOG_ALERT, "could not find password entry for user %s\n", user);
meillo@10 142 errno = ENOENT; /* getpwnam does not set errno correctly */
meillo@0 143 }
meillo@0 144
meillo@10 145 return ok;
meillo@0 146 }
meillo@0 147
meillo@0 148 gboolean
meillo@10 149 pipe_out(message * msg, GList * hdr_list, address * rcpt, gchar * cmd, guint flags)
meillo@0 150 {
meillo@10 151 gchar *envp[40];
meillo@10 152 FILE *out;
meillo@10 153 uid_t saved_uid = geteuid();
meillo@10 154 gid_t saved_gid = getegid();
meillo@10 155 gboolean ok = FALSE;
meillo@10 156 gint i, n;
meillo@10 157 pid_t pid;
meillo@10 158 void (*old_signal) (int);
meillo@10 159 int status;
meillo@0 160
meillo@10 161 /* set uid and gid to the mail ids */
meillo@10 162 if (!conf.run_as_user) {
meillo@10 163 set_euidgid(conf.mail_uid, conf.mail_gid, &saved_uid, &saved_gid);
meillo@10 164 }
meillo@0 165
meillo@10 166 /* set environment */
meillo@10 167 {
meillo@10 168 gint i = 0;
meillo@10 169 address *ancestor = addr_find_ancestor(rcpt);
meillo@0 170
meillo@10 171 envp[i++] = g_strdup_printf("SENDER=%s@%s", msg->return_path->local_part, msg->return_path->domain);
meillo@10 172 envp[i++] = g_strdup_printf("SENDER_DOMAIN=%s", msg->return_path->domain);
meillo@10 173 envp[i++] = g_strdup_printf("SENDER_LOCAL=%s", msg->return_path->local_part);
meillo@10 174 envp[i++] = g_strdup_printf("RECEIVED_HOST=%s", msg->received_host ? msg->received_host : "");
meillo@0 175
meillo@10 176 envp[i++] = g_strdup_printf("RETURN_PATH=%s@%s", msg->return_path->local_part, msg->return_path->domain);
meillo@10 177 envp[i++] = g_strdup_printf("DOMAIN=%s", ancestor->domain);
meillo@0 178
meillo@10 179 envp[i++] = g_strdup_printf("LOCAL_PART=%s", ancestor->local_part);
meillo@10 180 envp[i++] = g_strdup_printf("USER=%s", ancestor->local_part);
meillo@10 181 envp[i++] = g_strdup_printf("LOGNAME=%s", ancestor->local_part);
meillo@0 182
meillo@10 183 envp[i++] = g_strdup_printf("MESSAGE_ID=%s", msg->uid);
meillo@10 184 envp[i++] = g_strdup_printf("QUALIFY_DOMAIN=%s", conf.host_name);
meillo@0 185
meillo@10 186 envp[i] = NULL;
meillo@10 187 n = i;
meillo@10 188 }
meillo@0 189
meillo@10 190 old_signal = signal(SIGCHLD, SIG_DFL);
meillo@0 191
meillo@10 192 out = peidopen(cmd, "w", envp, &pid, conf.mail_uid, conf.mail_gid);
meillo@10 193 if (out != NULL) {
meillo@10 194 message_stream(out, msg, hdr_list, flags);
meillo@0 195
meillo@10 196 fclose(out);
meillo@0 197
meillo@10 198 waitpid(pid, &status, 0);
meillo@0 199
meillo@10 200 if (WEXITSTATUS(status) != 0) {
meillo@10 201 int exstat = WEXITSTATUS(status);
meillo@10 202 logwrite(LOG_ALERT, "process returned %d (%s)\n", exstat, ext_strerror(1024 + exstat));
meillo@10 203 errno = 1024 + exstat;
meillo@10 204 } else if (WIFSIGNALED(status)) {
meillo@10 205 logwrite(LOG_ALERT, "process got signal %d\n", WTERMSIG(status));
meillo@10 206 } else
meillo@10 207 ok = TRUE;
meillo@0 208
meillo@10 209 } else
meillo@10 210 logwrite(LOG_ALERT, "could not open pipe '%s': %s\n", cmd, strerror(errno));
meillo@0 211
meillo@10 212 signal(SIGCHLD, old_signal);
meillo@0 213
meillo@10 214 /* free environment */
meillo@10 215 for (i = 0; i < n; i++) {
meillo@10 216 g_free(envp[i]);
meillo@10 217 }
meillo@0 218
meillo@10 219 /* set uid and gid back */
meillo@10 220 if (!conf.run_as_user) {
meillo@10 221 set_euidgid(saved_uid, saved_gid, NULL, NULL);
meillo@10 222 }
meillo@0 223
meillo@10 224 return ok;
meillo@0 225 }