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annotate src/local.c @ 351:4c046561582a

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Minor refactoring
author markus schnalke <meillo@marmaro.de>
date Thu, 14 Jul 2011 14:12:32 +0200 (2011-07-14)
parents 63efd381e27b
children 41958685480d
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1 /* MasqMail
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2 Copyright (C) 1999-2001 Oliver Kurth
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3 Copyright (C) 2010 markus schnalke <meillo@marmaro.de>
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4
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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5 This program is free software; you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 2 of the License, or
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program; if not, write to the Free Software
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17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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18 */
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19
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20 #include <sys/wait.h>
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21 #include <sys/stat.h>
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22
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23 #include "masqmail.h"
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24 #include "peopen.h"
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26 static void
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27 message_stream(FILE * out, message * msg, GList * hdr_list, guint flags)
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28 {
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29 time_t now = time(NULL);
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30 GList *node;
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31
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32 if (flags & MSGSTR_FROMLINE) {
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33 fprintf(out, "From <%s@%s> %s", msg->return_path->local_part, msg->return_path->domain, ctime(&now));
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34 }
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35
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36 foreach(hdr_list, node) {
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37 header *hdr = (header *) (node->data);
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38 fputs(hdr->header, out);
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39 }
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40 putc('\n', out);
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41 foreach(msg->data_list, node) {
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42 /* From hack: */
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43 if (flags & MSGSTR_FROMHACK) {
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44 if (strncmp(node->data, "From ", 5) == 0)
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45 putc('>', out);
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46 }
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47 fputs(node->data, out);
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48 }
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49 putc('\n', out);
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50 }
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51
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52 gboolean
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53 append_file(message * msg, GList * hdr_list, gchar * user)
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54 {
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55 struct passwd *pw;
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56 gboolean ok = FALSE;
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57 uid_t saved_uid = geteuid();
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58 gid_t saved_gid = getegid();
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59 gboolean uid_ok = TRUE, gid_ok = TRUE;
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60 gchar *filename;
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61 FILE *out;
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62
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63 /* headers may be special for a local delivery */
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64 if (!hdr_list)
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65 hdr_list = msg->hdr_list;
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66
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67 if (!(pw = getpwnam(user))) {
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68 logwrite(LOG_ALERT, "could not find password entry for user %s\n", user);
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69 errno = ENOENT; /* getpwnam does not set errno correctly */
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70 return FALSE;
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71 }
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72
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73 if (!conf.run_as_user) {
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74 uid_ok = (seteuid(0) == 0);
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75 if (uid_ok) {
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76 gid_ok = (setegid(conf.mail_gid) == 0);
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77 uid_ok = (seteuid(pw->pw_uid) == 0);
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78 }
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79 if (!uid_ok || !gid_ok) {
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80 logwrite(LOG_ALERT, "could not set uid or gid for local delivery, uid = %d: %s\n", pw->pw_uid, strerror(errno));
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81 return FALSE;
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82 }
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83 }
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84
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85 DEBUG(5) debugf("running as euid %d, egid %d\n", geteuid(), getegid());
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86
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87 filename = g_strdup_printf("%s/%s", conf.mail_dir, user);
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88 if (!(out = fopen(filename, "a"))) {
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89 logwrite(LOG_ALERT, "could not open file %s: %s\n", filename, strerror(errno));
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90 } else {
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91 #ifdef USE_LIBLOCKFILE
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92 gint err;
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93 /* lock file using liblockfile */
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94 err = maillock(user, 3);
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95 if (err == 0) {
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96 #else
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97 /* lock file: */
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98 struct flock lock;
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99 lock.l_type = F_WRLCK;
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100 lock.l_whence = SEEK_END;
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101 lock.l_start = lock.l_len = 0;
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102 if (fcntl(fileno(out), F_SETLK, &lock) != -1) {
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103 #endif
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104 fchmod(fileno(out), 0600);
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105 message_stream(out, msg, hdr_list, MSGSTR_FROMLINE | MSGSTR_FROMHACK);
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106 ok = TRUE;
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107
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108 /* close when still user */
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109 fclose(out);
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110 #ifdef USE_LIBLOCKFILE
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111 mailunlock();
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112 #endif
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113 } else {
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114 fclose(out);
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115 #ifdef USE_LIBLOCKFILE
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116 DEBUG(3) debugf("could not lock file %s: error %d\n", filename, err);
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117 } /* XEmacs indenting convenience... */
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118 #else
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119 DEBUG(3) debugf("could not lock file %s: %s\n", filename, strerror(errno));
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120 }
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121 #endif
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122 }
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123 g_free(filename);
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124
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125 if (!conf.run_as_user) {
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126 uid_ok = (seteuid(0) == 0);
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127 if (uid_ok) {
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128 gid_ok = (setegid(saved_gid) == 0);
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129 uid_ok = (seteuid(saved_uid) == 0);
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130 }
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131 }
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132
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133 if (!uid_ok || !gid_ok) {
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134 /* FIXME: if this fails we HAVE to exit, because we shall not run
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135 with some users id. But we do not return, and so this message
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136 will not be finished, so the user will get the message again
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137 next time a delivery is attempted... */
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138 logwrite(LOG_ALERT, "could not set back uid or gid after local delivery: %s\n", strerror(errno));
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139 logwrite(LOG_ALERT, "uid=%d, gid=%d, euid=%d, egid=%d, want = %d, %d\n",
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140 getuid(), getgid(), geteuid(), getegid(), saved_uid, saved_gid);
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141 logwrite(LOG_ALERT, "In case of trouble, see local.c:append_file() for details.\n", strerror(errno));
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142 exit(1);
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143 }
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144 return ok;
0
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145 }
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146
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147 gboolean
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148 pipe_out(message * msg, GList * hdr_list, address * rcpt, gchar * cmd, guint flags)
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149 {
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150 gchar *envp[40];
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151 FILE *out;
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152 uid_t saved_uid = geteuid();
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153 gid_t saved_gid = getegid();
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154 gboolean ok = FALSE;
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155 gint i, n;
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156 pid_t pid;
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157 void (*old_signal) (int);
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158 int status;
332
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159 address *ancestor = addr_find_ancestor(rcpt);
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160
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161 /* set uid and gid to the mail ids */
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162 if (!conf.run_as_user) {
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163 set_euidgid(conf.mail_uid, conf.mail_gid, &saved_uid, &saved_gid);
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164 }
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165
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166 /* set environment */
332
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167 n = 0;
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168 envp[n++] = g_strdup_printf("SENDER=%s@%s", msg->return_path->local_part, msg->return_path->domain);
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169 envp[n++] = g_strdup_printf("SENDER_DOMAIN=%s", msg->return_path->domain);
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170 envp[n++] = g_strdup_printf("SENDER_LOCAL=%s", msg->return_path->local_part);
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171 envp[n++] = g_strdup_printf("RECEIVED_HOST=%s", msg->received_host ? msg->received_host : "");
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172
332
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173 envp[n++] = g_strdup_printf("RETURN_PATH=%s@%s", msg->return_path->local_part, msg->return_path->domain);
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174 envp[n++] = g_strdup_printf("DOMAIN=%s", ancestor->domain);
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175
332
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176 envp[n++] = g_strdup_printf("LOCAL_PART=%s", ancestor->local_part);
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177 envp[n++] = g_strdup_printf("USER=%s", ancestor->local_part);
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178 envp[n++] = g_strdup_printf("LOGNAME=%s", ancestor->local_part);
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179
332
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180 envp[n++] = g_strdup_printf("MESSAGE_ID=%s", msg->uid);
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181 envp[n++] = g_strdup_printf("QUALIFY_DOMAIN=%s", conf.host_name);
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182
332
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183 envp[n] = NULL;
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184
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185 old_signal = signal(SIGCHLD, SIG_DFL);
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186
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187 out = peidopen(cmd, "w", envp, &pid, conf.mail_uid, conf.mail_gid);
332
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188 if (!out) {
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189 logwrite(LOG_ALERT, "could not open pipe '%s': %s\n", cmd, strerror(errno));
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190 } else {
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191 message_stream(out, msg, hdr_list, flags);
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192
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193 fclose(out);
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194
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195 waitpid(pid, &status, 0);
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196
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197 if (WEXITSTATUS(status) != 0) {
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198 int exstat = WEXITSTATUS(status);
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199 logwrite(LOG_ALERT, "process returned %d (%s)\n", exstat, ext_strerror(1024 + exstat));
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200 errno = 1024 + exstat;
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201 } else if (WIFSIGNALED(status)) {
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202 logwrite(LOG_ALERT, "process got signal %d\n", WTERMSIG(status));
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203 } else
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204 ok = TRUE;
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205
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206 }
0
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207
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208 signal(SIGCHLD, old_signal);
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209
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210 /* free environment */
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211 for (i = 0; i < n; i++) {
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212 g_free(envp[i]);
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213 }
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214
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215 /* set uid and gid back */
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216 if (!conf.run_as_user) {
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217 set_euidgid(saved_uid, saved_gid, NULL, NULL);
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218 }
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219
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220 return ok;
0
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221 }