Mercurial > masqmail
annotate src/smtp_in.c @ 331:e507c854a63e
Security fix! Correct handling of seteuid() return value
See Debian bug #638002, reported by John Lightsey.
When possible the (already available) set_euidgid() function is used.
Additionally, it is unnecessary to change the identity when writing
into an already open file descriptor.
This should fix the problem.
| author | markus schnalke <meillo@marmaro.de> |
|---|---|
| date | Sat, 27 Aug 2011 16:19:07 +0200 |
| parents | 794071925a22 |
| children | 53cf6be5843a |
| rev | line source |
|---|---|
| 0 | 1 /* MasqMail |
| 2 Copyright (C) 1999-2001 Oliver Kurth | |
| 80 | 3 Copyright (C) 2010 markus schnalke <meillo@marmaro.de> |
| 0 | 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 "masqmail.h" | |
| 21 #include "readsock.h" | |
| 22 | |
| 23 /* | |
| 24 I always forget these rfc numbers: | |
| 25 RFC 821 (SMTP) | |
| 26 RFC 1869 (ESMTP) | |
| 27 RFC 1870 (ESMTP SIZE) | |
| 28 RFC 2197 (ESMTP PIPELINE) | |
| 29 RFC 2554 (ESMTP AUTH) | |
| 30 */ | |
| 31 | |
| 32 | |
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33 smtp_cmd smtp_cmds[] = { |
| 15 | 34 {SMTP_HELO, "HELO",}, |
| 35 {SMTP_EHLO, "EHLO",}, | |
| 36 {SMTP_MAIL_FROM, "MAIL FROM:",}, | |
| 37 {SMTP_RCPT_TO, "RCPT TO:",}, | |
| 38 {SMTP_DATA, "DATA",}, | |
| 39 {SMTP_QUIT, "QUIT",}, | |
| 40 {SMTP_RSET, "RSET",}, | |
| 41 {SMTP_NOOP, "NOOP",}, | |
| 42 {SMTP_HELP, "HELP"}, | |
| 0 | 43 }; |
| 44 | |
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45 static smtp_cmd_id |
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46 get_id(const gchar * line) |
| 0 | 47 { |
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48 gint i; |
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49 for (i = 0; i < SMTP_NUM_IDS; i++) { |
| 80 | 50 if (strncasecmp(smtp_cmds[i].cmd, line, strlen(smtp_cmds[i].cmd)) == 0) { |
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51 return (smtp_cmd_id) i; |
| 80 | 52 } |
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53 } |
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54 return SMTP_ERROR; |
| 0 | 55 } |
| 56 | |
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57 static gboolean |
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58 get_size(gchar *line, unsigned long *msize) { |
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59 gchar *s = NULL; |
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60 |
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61 /* hope we need not to handle cases like SiZe= ...*/ |
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62 s = strstr(line, "SIZE="); |
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63 if (!s) { |
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64 /* try it in lowercase too */ |
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65 if (!(s = strstr(line, "size="))) { |
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66 return FALSE; |
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67 } |
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68 } |
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69 s += 5; |
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70 *msize = atol(s); |
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71 DEBUG(5) debugf("get_size(): line=%s, msize=%ld\n", line, *msize); |
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72 |
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73 return TRUE; |
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74 } |
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75 |
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76 |
| 0 | 77 /* this is a quick hack: we expect the address to be syntactically correct |
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78 and containing the mailbox only, though we first check for size in |
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79 smtp_in(). |
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80 Return false if address is too long. |
| 0 | 81 */ |
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82 static gboolean |
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83 get_address(gchar * line, gchar * addr) |
| 0 | 84 { |
| 80 | 85 gchar *p = line; |
| 86 gchar *q = addr; | |
| 0 | 87 |
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88 /* skip MAIL FROM: and RCPT TO: */ |
| 80 | 89 while (*p && (*p != ':')) { |
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90 p++; |
| 80 | 91 } |
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92 p++; |
| 0 | 93 |
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94 /* skip spaces: */ |
| 80 | 95 while (*p && isspace(*p)) { |
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96 p++; |
| 80 | 97 } |
| 0 | 98 |
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99 /* get address: */ |
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100 while (*p && !isspace(*p)) { |
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101 if (q >= addr + MAX_ADDRESS-1) { |
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102 *q = '\0'; |
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103 return FALSE; |
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104 } |
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105 *(q++) = *(p++); |
| 80 | 106 } |
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107 *q = '\0'; |
| 0 | 108 |
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109 return TRUE; |
| 0 | 110 } |
| 111 | |
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112 static smtp_connection* |
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113 create_base(gchar * remote_host) |
| 0 | 114 { |
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115 smtp_connection *base = g_malloc(sizeof(smtp_connection)); |
| 80 | 116 if (!base) { |
| 117 return NULL; | |
| 118 } | |
| 119 | |
| 120 base->remote_host = g_strdup(remote_host); | |
| 0 | 121 |
| 80 | 122 base->prot = PROT_SMTP; |
| 123 base->next_id = 0; | |
| 124 base->helo_seen = 0; | |
| 125 base->from_seen = 0; | |
| 126 base->rcpt_seen = 0; | |
| 127 base->msg = NULL; | |
| 0 | 128 |
| 80 | 129 return base; |
| 0 | 130 } |
| 131 | |
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132 static void |
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133 smtp_printf(FILE * out, gchar * fmt, ...) |
| 0 | 134 { |
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135 va_list args; |
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136 va_start(args, fmt); |
| 0 | 137 |
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138 DEBUG(4) { |
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139 gchar buf[256]; |
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140 va_list args_copy; |
| 0 | 141 |
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142 va_copy(args_copy, args); |
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143 vsnprintf(buf, 255, fmt, args_copy); |
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144 va_end(args_copy); |
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145 |
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146 debugf(">>>%s\n", buf); |
| 0 | 147 } |
| 148 | |
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149 vfprintf(out, fmt, args); |
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150 fflush(out); |
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151 |
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152 va_end(args); |
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153 } |
| 0 | 154 |
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155 void |
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156 smtp_in(FILE * in, FILE * out, gchar * remote_host, gchar * ident) |
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157 { |
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158 gchar *buffer; |
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159 smtp_cmd_id cmd_id; |
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160 message *msg = NULL; |
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161 smtp_connection *psc; |
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162 int len; |
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163 unsigned long size, msize; |
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164 |
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165 DEBUG(5) debugf("smtp_in entered, remote_host = %s\n", remote_host); |
| 0 | 166 |
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167 psc = create_base(remote_host); |
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168 psc->msg = msg; |
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169 |
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170 buffer = (gchar *) g_malloc(BUF_LEN); |
| 80 | 171 if (!buffer) { |
| 172 /* this check is actually unneccessary as g_malloc() | |
| 173 aborts on failure */ | |
| 174 return; | |
| 175 } | |
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176 |
| 80 | 177 /* send greeting string, containing ESMTP: */ |
| 178 smtp_printf(out, "220 %s MasqMail %s ESMTP\r\n", conf.host_name, VERSION); | |
| 0 | 179 |
| 80 | 180 while ((len = read_sockline(in, buffer, BUF_LEN, 5 * 60, READSOCKL_CHUG)) >= 0) { |
| 181 cmd_id = get_id(buffer); | |
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182 |
| 135 | 183 if (conf.defer_all) { |
| 184 /* I need this to debug delivery failures */ | |
| 127 | 185 smtp_printf(out, "421 %s service temporarily unavailable.\r\n", conf.host_name); |
| 135 | 186 destroy_message(msg); |
| 187 msg = NULL; | |
| 188 return; | |
| 127 | 189 } |
| 190 | |
| 80 | 191 switch (cmd_id) { |
| 127 | 192 case SMTP_HELO: |
| 193 psc->prot = PROT_SMTP; | |
| 194 psc->helo_seen = TRUE; | |
| 195 smtp_printf(out, "250 %s pretty old mailer, huh?\r\n", conf.host_name); | |
| 196 break; | |
| 197 | |
| 80 | 198 case SMTP_EHLO: |
| 199 psc->prot = PROT_ESMTP; | |
| 200 psc->helo_seen = TRUE; | |
| 127 | 201 smtp_printf(out, "250-%s Nice to meet you with ESMTP\r\n", conf.host_name); |
| 202 smtp_printf(out, "250-SIZE %d\r\n", conf.max_msg_size); | |
| 203 smtp_printf(out, "250-PIPELINING\r\n"); | |
| 204 smtp_printf(out, "250 HELP\r\n"); | |
| 80 | 205 break; |
| 206 | |
| 207 case SMTP_MAIL_FROM: | |
| 208 { | |
| 209 gchar buf[MAX_ADDRESS]; | |
| 210 address *addr; | |
| 211 | |
| 212 if (!psc->helo_seen) { | |
| 213 smtp_printf(out, "503 need HELO or EHLO\r\n"); | |
| 214 break; | |
| 215 } | |
| 216 if (psc->from_seen) { | |
| 217 smtp_printf(out, "503 MAIL FROM: already given.\r\n"); | |
| 218 break; | |
| 219 } | |
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220 if (get_size(buffer, &msize)) { |
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221 DEBUG(5) debugf("smtp_in(): get_size: msize=%ld, conf.mms=%d\n", |
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222 msize, conf.max_msg_size); |
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223 if (conf.max_msg_size && (msize > conf.max_msg_size)) { |
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224 smtp_printf(out, "552 Message size exceeds fixed limit.\r\n"); |
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225 break; |
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226 } |
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227 } |
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228 if (!get_address(buffer, buf)) { |
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229 smtp_printf(out, "553 Address too long.\r\n"); |
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230 break; |
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231 } |
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232 |
| 80 | 233 msg = create_message(); |
| 234 msg->received_host = remote_host ? g_strdup(remote_host) : NULL; | |
| 235 msg->received_prot = psc->prot; | |
| 236 msg->ident = ident ? g_strdup(ident) : NULL; | |
| 237 /* get transfer id and increment for next one */ | |
| 238 msg->transfer_id = (psc->next_id)++; | |
| 239 | |
| 240 if (remote_host) { | |
| 241 addr = create_address(buf, TRUE); | |
| 242 } else { | |
| 243 addr = create_address_qualified(buf, TRUE, conf.host_name); | |
| 244 } | |
| 245 if (!addr) { | |
| 246 smtp_printf(out, "501 %s: syntax error.\r\n", buf); | |
| 247 } else if (!addr->domain) { | |
| 248 smtp_printf(out, "501 return path must be qualified.\r\n", buf); | |
| 249 } else { | |
| 250 psc->from_seen = TRUE; | |
| 251 msg->return_path = addr; | |
| 252 smtp_printf(out, "250 OK %s is a nice guy.\r\n", addr->address); | |
| 253 } | |
| 254 } | |
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255 break; |
| 80 | 256 |
| 257 case SMTP_RCPT_TO: | |
| 258 { | |
| 259 char buf[MAX_ADDRESS]; | |
| 260 address *addr; | |
| 261 | |
| 262 if (!psc->helo_seen) { | |
| 263 smtp_printf(out, "503 need HELO or EHLO.\r\n"); | |
| 264 break; | |
| 265 } | |
| 266 if (!psc->from_seen) { | |
| 267 smtp_printf(out, "503 need MAIL FROM: before RCPT TO:\r\n"); | |
| 268 break; | |
| 269 } | |
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270 if (!get_address(buffer, buf)) { |
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271 smtp_printf(out, "553 Address too long.\r\n"); |
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272 break; |
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273 } |
| 80 | 274 |
| 275 if (remote_host) { | |
| 276 addr = create_address(buf, TRUE); | |
| 277 } else { | |
| 278 addr = create_address_qualified(buf, TRUE, conf.host_name); | |
| 279 } | |
| 280 if (!addr) { | |
| 281 smtp_printf(out, "501 %s: syntax error in address.\r\n", buf); | |
| 282 break; | |
| 283 } | |
| 284 if (addr->local_part[0] == '|') { | |
| 285 smtp_printf(out, "501 %s: no pipe allowed for SMTP connections\r\n", buf); | |
| 286 break; | |
| 287 } | |
| 288 if (!addr->domain) { | |
| 305 | 289 /* TODO: ``postmaster'' may be unqualified */ |
| 80 | 290 smtp_printf(out, "501 recipient address must be qualified.\r\n", buf); |
| 291 break; | |
| 292 } | |
| 305 | 293 if (!(conf.do_relay || addr_is_local(msg->return_path) || addr_is_local(addr))) { |
| 80 | 294 smtp_printf(out, "550 relaying to %s denied.\r\n", addr_string(addr)); |
| 295 break; | |
| 296 } | |
| 297 psc->rcpt_seen = TRUE; | |
| 298 msg->rcpt_list = g_list_append(msg->rcpt_list, addr); | |
| 299 smtp_printf(out, "250 OK %s is our friend.\r\n", addr->address); | |
| 300 } | |
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301 break; |
| 80 | 302 |
| 303 case SMTP_DATA: | |
| 304 if (!psc->helo_seen) { | |
| 305 smtp_printf(out, "503 need HELO or EHLO.\r\n"); | |
| 306 break; | |
| 307 } | |
| 308 if (!psc->rcpt_seen) { | |
| 309 smtp_printf(out, "503 need RCPT TO: before DATA\r\n"); | |
| 310 break; | |
| 311 } | |
| 312 accept_error err; | |
| 313 | |
| 314 smtp_printf(out, "354 okay, and do not forget the dot\r\n"); | |
| 315 | |
| 316 err = accept_message(in, msg, conf.do_save_envelope_to ? ACC_SAVE_ENVELOPE_TO : 0); | |
| 317 if (err != AERR_OK) { | |
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318 switch (err) { |
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319 case AERR_TIMEOUT: |
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320 case AERR_EOF: |
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321 return; |
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322 case AERR_SIZE: |
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323 smtp_printf(out, "552 Error: message too large.\r\n"); |
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324 return; |
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325 default: |
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326 /* should never happen: */ |
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327 smtp_printf(out, "451 Unknown error\r\n"); |
| 80 | 328 return; |
| 329 } | |
| 330 } | |
| 331 | |
| 332 | |
| 333 if (!spool_write(msg, TRUE)) { | |
| 334 smtp_printf(out, "451 Could not write spool file\r\n"); | |
| 335 return; | |
| 336 } | |
| 337 pid_t pid; | |
| 338 smtp_printf(out, "250 OK id=%s\r\n", msg->uid); | |
| 339 | |
| 340 if (remote_host != NULL) { | |
| 341 logwrite(LOG_NOTICE, "%s <= <%s@%s> host=%s with %s\n", msg->uid, | |
| 342 msg->return_path->local_part, msg->return_path->domain, | |
| 343 remote_host, prot_names[psc->prot]); | |
| 344 } else { | |
| 345 logwrite(LOG_NOTICE, "%s <= <%s@%s> with %s\n", msg->uid, | |
| 346 msg->return_path->local_part, msg->return_path->domain, | |
| 347 prot_names[psc->prot]); | |
| 348 } | |
| 349 | |
| 350 if (conf.do_queue) { | |
| 351 DEBUG(1) debugf("queuing forced by configuration or option.\n"); | |
| 352 } else { | |
| 353 pid = fork(); | |
| 354 if (pid == 0) { | |
| 355 _exit(deliver(msg)); | |
| 356 } else if (pid < 0) { | |
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357 logwrite(LOG_ALERT, "could not fork for delivery, id = %s\n", msg->uid); |
| 80 | 358 } |
| 359 } | |
| 360 psc->rcpt_seen = psc->from_seen = FALSE; | |
| 361 destroy_message(msg); | |
| 362 msg = NULL; | |
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363 break; |
| 80 | 364 |
| 365 case SMTP_QUIT: | |
| 366 smtp_printf(out, "221 goodbye\r\n"); | |
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367 destroy_message(msg); |
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368 msg = NULL; |
| 80 | 369 return; |
| 370 | |
| 371 case SMTP_RSET: | |
| 372 psc->from_seen = psc->rcpt_seen = FALSE; | |
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373 destroy_message(msg); |
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374 msg = NULL; |
| 80 | 375 smtp_printf(out, "250 OK\r\n"); |
| 376 break; | |
| 377 | |
| 378 case SMTP_NOOP: | |
| 379 smtp_printf(out, "250 OK\r\n"); | |
| 380 break; | |
| 381 | |
| 382 case SMTP_HELP: | |
| 383 { | |
| 384 int i; | |
| 385 | |
| 386 smtp_printf(out, "214-supported commands:\r\n"); | |
| 387 for (i = 0; i < SMTP_NUM_IDS - 1; i++) { | |
| 388 smtp_printf(out, "214-%s\r\n", smtp_cmds[i].cmd); | |
| 389 } | |
| 390 smtp_printf(out, "214 %s\r\n", smtp_cmds[i].cmd); | |
| 391 } | |
| 392 break; | |
| 393 | |
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394 default: |
| 80 | 395 smtp_printf(out, "501 command not recognized\r\n"); |
| 396 DEBUG(1) debugf("command not recognized, was '%s'\n", buffer); | |
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397 break; |
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398 } |
| 0 | 399 } |
| 80 | 400 switch (len) { |
| 401 case -3: | |
| 402 logwrite(LOG_NOTICE, "connection timed out\n"); | |
| 403 break; | |
| 404 case -2: | |
| 405 logwrite(LOG_NOTICE, "line overflow\n"); | |
| 406 break; | |
| 407 case -1: | |
| 408 logwrite(LOG_NOTICE, "received EOF\n"); | |
| 409 break; | |
| 410 default: | |
| 411 break; | |
| 412 } | |
| 0 | 413 } |