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annotate src/local.c @ 209:10da50168dab

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replaced the MD5 implementation with the one of Solar Designer Until now, the sample code of RFC 1321 was used. It had an ugly license. Now we use the implementation of Solar Designer, which is in the Public Domain. http://openwall.info/wiki/people/solar/software/public-domain-source-code/md5
author meillo@marmaro.de
date Sun, 18 Jul 2010 21:58:15 +0200
parents 4fd237550525
children 996b53a50f55
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1 /* MasqMail
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2 Copyright (C) 1999-2001 Oliver Kurth
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3
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4 This program is free software; you can redistribute it and/or modify
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2 of the License, or
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program; if not, write to the Free Software
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16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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17 */
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18
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19 #include <sys/wait.h>
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20 #include <sys/stat.h>
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21
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22 #include "masqmail.h"
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23 #include "peopen.h"
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25 static void
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26 message_stream(FILE * out, message * msg, GList * hdr_list, guint flags)
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27 {
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28 time_t now = time(NULL);
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29 GList *node;
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30
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31 if (flags & MSGSTR_FROMLINE) {
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32 fprintf(out, "From <%s@%s> %s", msg->return_path->local_part, msg->return_path->domain, ctime(&now));
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33 }
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34
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35 foreach(hdr_list, node) {
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36 header *hdr = (header *) (node->data);
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37 fputs(hdr->header, out);
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38 }
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39 putc('\n', out);
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40 foreach(msg->data_list, node) {
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41 /* From hack: */
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42 if (flags & MSGSTR_FROMHACK) {
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43 if (strncmp(node->data, "From ", 5) == 0)
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44 putc('>', out);
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45 }
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46 fputs(node->data, out);
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47 }
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48 putc('\n', out);
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49 }
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50
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51 gboolean
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52 append_file(message * msg, GList * hdr_list, gchar * user)
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53 {
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54 struct passwd *pw;
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55 gboolean ok = FALSE;
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56
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57 /* headers may be special for a local delivery */
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58 if (hdr_list == NULL)
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59 hdr_list = msg->hdr_list;
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60
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61 if ((pw = getpwnam(user))) {
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62 uid_t saved_uid = geteuid();
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63 gid_t saved_gid = getegid();
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64 gboolean uid_ok = TRUE, gid_ok = TRUE;
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66 if (!conf.run_as_user) {
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67 uid_ok = (seteuid(0) == 0);
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68 if (uid_ok) {
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69 gid_ok = (setegid(conf.mail_gid) == 0);
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70 uid_ok = (seteuid(pw->pw_uid) == 0);
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71 }
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72 }
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73
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74 DEBUG(5) debugf("running as euid %d, egid %d\n", geteuid(), getegid());
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76 if (uid_ok && gid_ok) {
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77 gchar *filename;
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78 FILE *out;
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79
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80 filename = g_strdup_printf("%s/%s", conf.mail_dir, user);
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81 if ((out = fopen(filename, "a"))) {
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82 #ifdef USE_LIBLOCKFILE
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83 gint err;
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84 /* lock file using liblockfile */
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85 err = maillock(user, 3);
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86 if (err == 0) {
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87 #else
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88 /* lock file: */
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89 struct flock lock;
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90 lock.l_type = F_WRLCK;
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91 lock.l_whence = SEEK_END;
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92 lock.l_start = lock.l_len = 0;
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93 if (fcntl(fileno(out), F_SETLK, &lock) != -1) {
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94 #endif
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95 fchmod(fileno(out), 0600);
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96 message_stream(out, msg, hdr_list, MSGSTR_FROMLINE | MSGSTR_FROMHACK);
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97 ok = TRUE;
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98
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99 /* close when still user */
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100 fclose(out);
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101 #ifdef USE_LIBLOCKFILE
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102 mailunlock();
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103 #endif
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104 } else {
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105 fclose(out);
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106 #ifdef USE_LIBLOCKFILE
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107 DEBUG(3) debugf("could not lock file %s: error %d\n", filename, err);
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108 } /* XEmacs indenting convenience... */
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109 #else
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110 DEBUG(3) debugf("could not lock file %s: %s\n", filename, strerror(errno));
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111 }
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112 #endif
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113 } else {
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114 logwrite(LOG_ALERT, "could not open file %s: %s\n", filename, strerror(errno));
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115 }
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116 g_free(filename);
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117
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118 if (!conf.run_as_user) {
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119 uid_ok = (seteuid(0) == 0);
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120 if (uid_ok) {
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121 gid_ok = (setegid(saved_gid) == 0);
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122 uid_ok = (seteuid(saved_uid) == 0);
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123 }
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124 }
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125
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126 if (!uid_ok || !gid_ok) {
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127 /* FIXME: if this fails we HAVE to exit, because we shall not run
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128 with some users id. But we do not return, and so this message
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129 will not be finished, so the user will get the message again
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130 next time a delivery is attempted... */
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131 logwrite(LOG_ALERT, "could not set back uid or gid after local delivery: %s\n", strerror(errno));
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132 logwrite(LOG_ALERT, "uid=%d, gid=%d, euid=%d, egid=%d, want = %d, %d\n",
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133 getuid(), getgid(), geteuid(), getegid(), saved_uid, saved_gid);
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134 exit(EXIT_FAILURE);
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135 }
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136 } else {
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137 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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138 }
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139 } else {
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140 logwrite(LOG_ALERT, "could not find password entry for user %s\n", user);
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141 errno = ENOENT; /* getpwnam does not set errno correctly */
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142 }
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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;
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159
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160 /* set uid and gid to the mail ids */
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161 if (!conf.run_as_user) {
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162 set_euidgid(conf.mail_uid, conf.mail_gid, &saved_uid, &saved_gid);
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163 }
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164
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165 /* set environment */
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166 {
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167 gint i = 0;
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168 address *ancestor = addr_find_ancestor(rcpt);
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169
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170 envp[i++] = g_strdup_printf("SENDER=%s@%s", msg->return_path->local_part, msg->return_path->domain);
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171 envp[i++] = g_strdup_printf("SENDER_DOMAIN=%s", msg->return_path->domain);
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172 envp[i++] = g_strdup_printf("SENDER_LOCAL=%s", msg->return_path->local_part);
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173 envp[i++] = g_strdup_printf("RECEIVED_HOST=%s", msg->received_host ? msg->received_host : "");
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174
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175 envp[i++] = g_strdup_printf("RETURN_PATH=%s@%s", msg->return_path->local_part, msg->return_path->domain);
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176 envp[i++] = g_strdup_printf("DOMAIN=%s", ancestor->domain);
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177
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178 envp[i++] = g_strdup_printf("LOCAL_PART=%s", ancestor->local_part);
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179 envp[i++] = g_strdup_printf("USER=%s", ancestor->local_part);
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180 envp[i++] = g_strdup_printf("LOGNAME=%s", ancestor->local_part);
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181
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182 envp[i++] = g_strdup_printf("MESSAGE_ID=%s", msg->uid);
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183 envp[i++] = g_strdup_printf("QUALIFY_DOMAIN=%s", conf.host_name);
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184
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185 envp[i] = NULL;
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186 n = i;
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187 }
0
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188
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189 old_signal = signal(SIGCHLD, SIG_DFL);
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190
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191 out = peidopen(cmd, "w", envp, &pid, conf.mail_uid, conf.mail_gid);
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192 if (out != NULL) {
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193 message_stream(out, msg, hdr_list, flags);
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194
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195 fclose(out);
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196
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197 waitpid(pid, &status, 0);
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198
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199 if (WEXITSTATUS(status) != 0) {
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200 int exstat = WEXITSTATUS(status);
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201 logwrite(LOG_ALERT, "process returned %d (%s)\n", exstat, ext_strerror(1024 + exstat));
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202 errno = 1024 + exstat;
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203 } else if (WIFSIGNALED(status)) {
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204 logwrite(LOG_ALERT, "process got signal %d\n", WTERMSIG(status));
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205 } else
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206 ok = TRUE;
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207
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208 } else
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209 logwrite(LOG_ALERT, "could not open pipe '%s': %s\n", cmd, strerror(errno));
0
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210
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211 signal(SIGCHLD, old_signal);
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212
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213 /* free environment */
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214 for (i = 0; i < n; i++) {
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215 g_free(envp[i]);
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216 }
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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217
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218 /* set uid and gid back */
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219 if (!conf.run_as_user) {
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220 set_euidgid(saved_uid, saved_gid, NULL, NULL);
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221 }
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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222
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223 return ok;
0
08114f7dcc23 this is masqmail-0.2.21 from oliver kurth
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224 }