summaryrefslogtreecommitdiff
path: root/indra/llmessage/llmail.cpp
blob: 1a076b7281e83dd446719907104de1bdf71a5357 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
/** 
 * @file llmail.cpp
 * @brief smtp helper functions.
 *
 * $LicenseInfo:firstyear=2001&license=viewergpl$
 * 
 * Copyright (c) 2001-2007, Linden Research, Inc.
 * 
 * Second Life Viewer Source Code
 * The source code in this file ("Source Code") is provided by Linden Lab
 * to you under the terms of the GNU General Public License, version 2.0
 * ("GPL"), unless you have obtained a separate licensing agreement
 * ("Other License"), formally executed by you and Linden Lab.  Terms of
 * the GPL can be found in doc/GPL-license.txt in this distribution, or
 * online at http://secondlife.com/developers/opensource/gplv2
 * 
 * There are special exceptions to the terms and conditions of the GPL as
 * it is applied to this Source Code. View the full text of the exception
 * in the file doc/FLOSS-exception.txt in this software distribution, or
 * online at http://secondlife.com/developers/opensource/flossexception
 * 
 * By copying, modifying or distributing this software, you acknowledge
 * that you have read and understood your obligations described above,
 * and agree to abide by those obligations.
 * 
 * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
 * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
 * COMPLETENESS OR PERFORMANCE.
 * $/LicenseInfo$
 */

#include "linden_common.h"

#include "llmail.h"

// APR on Windows needs full windows headers
#ifdef LL_WINDOWS
#	undef WIN32_LEAN_AND_MEAN
#	include <winsock2.h>
#	include <windows.h>
#endif

#include <string>
#include <sstream>

#include "apr_pools.h"
#include "apr_network_io.h"

#include "llapr.h"
#include "llbase32.h"	// IM-to-email address
#include "llblowfishcipher.h"
#include "llerror.h"
#include "llhost.h"
#include "llstring.h"
#include "lluuid.h"
#include "net.h"

//
// constants
//
const size_t LL_MAX_KNOWN_GOOD_MAIL_SIZE = 4096;

static bool gMailEnabled = true;
static apr_pool_t* gMailPool;
static apr_sockaddr_t* gSockAddr;
static apr_socket_t* gMailSocket;

bool connect_smtp();
void disconnect_smtp();
 
//#if LL_WINDOWS
//SOCKADDR_IN gMailDstAddr, gMailSrcAddr, gMailLclAddr;
//#else
//struct sockaddr_in gMailDstAddr, gMailSrcAddr, gMailLclAddr;
//#endif

// Define this for a super-spammy mail mode.
//#define LL_LOG_ENTIRE_MAIL_MESSAGE_ON_SEND 1

bool connect_smtp()
{
	// Prepare an soket to talk smtp
	apr_status_t status;
	status = apr_socket_create(
		&gMailSocket,
		gSockAddr->sa.sin.sin_family,
		SOCK_STREAM,
		APR_PROTO_TCP,
		gMailPool);
	if(ll_apr_warn_status(status)) return false;
	status = apr_socket_connect(gMailSocket, gSockAddr);
	if(ll_apr_warn_status(status))
	{
		status = apr_socket_close(gMailSocket);
		ll_apr_warn_status(status);
		return false;
	}
	return true;
}

void disconnect_smtp()
{
	if(gMailSocket)
	{
		apr_status_t status = apr_socket_close(gMailSocket);
		ll_apr_warn_status(status);
		gMailSocket = NULL;
	}
}

// Returns TRUE on success.
// message should NOT be SMTP escaped.
// static
BOOL LLMail::send(const char* from_name, const char* from_address,
			   const char* to_name, const char* to_address,
			   const char* subject, const char* message)
{
	std::string header = buildSMTPTransaction(
		from_name,
		from_address,
		to_name,
		to_address,
		subject);
	if(header.empty())
	{
		return FALSE;
	}

	std::string message_str;
	if(message)
	{
		message_str = message;
	}
	bool rv = send(header, message_str, to_address, from_address);
	if(rv) return TRUE;
	return FALSE;
}

// static
void LLMail::init(const std::string& hostname, apr_pool_t* pool)
{
	gMailSocket = NULL;
	if(hostname.empty() || !pool)
	{
		gMailPool = NULL;
		gSockAddr = NULL;
	}
	else
	{
		gMailPool = pool;

		// collect all the information into a socaddr sturcture. the
		// documentation is a bit unclear, but I either have to
		// specify APR_UNSPEC or not specify any flags. I am not sure
		// which option is better.
		apr_status_t status = apr_sockaddr_info_get(
			&gSockAddr,
			hostname.c_str(),
			APR_UNSPEC,
			25,
			APR_IPV4_ADDR_OK,
			gMailPool);
		ll_apr_warn_status(status);
	}
}

// static
void LLMail::enable(bool mail_enabled)
{
	gMailEnabled = mail_enabled;
}

// Test a subject line for RFC2822 compliance.
static bool valid_subject_chars(const char *subject)
{
	for (; *subject != '\0'; subject++)
	{
		unsigned char c = *subject;

		if (c == '\xa' || c == '\xd' || c > '\x7f')
		{
			return false;
		}
	}

	return true;
}

// static
std::string LLMail::buildSMTPTransaction(
	const char* from_name,
	const char* from_address,
	const char* to_name,
	const char* to_address,
	const char* subject)
{
	if(!from_address || !to_address)
	{
		llinfos << "send_mail build_smtp_transaction reject: missing to and/or"
			<< " from address." << llendl;
		return std::string();
	}
	if(!valid_subject_chars(subject))
	{
		llinfos << "send_mail build_smtp_transaction reject: bad subject header: "
			<< "to=<" << to_address
			<< ">, from=<" << from_address << ">"
			<< llendl;
		return std::string();
	}
	std::ostringstream from_fmt;
	if(from_name && from_name[0])
	{
		// "My Name" <myaddress@example.com>
		from_fmt << "\"" << from_name << "\" <" << from_address << ">";
	}
	else
	{
		// <myaddress@example.com>
		from_fmt << "<" << from_address << ">";
	}
	std::ostringstream to_fmt;
	if(to_name && to_name[0])
	{
		to_fmt << "\"" << to_name << "\" <" << to_address << ">";
	}
	else
	{
		to_fmt << "<" << to_address << ">";
	}
	std::ostringstream header;
	header
		<< "HELO lindenlab.com\r\n"
		<< "MAIL FROM:<" << from_address << ">\r\n"
		<< "RCPT TO:<" << to_address << ">\r\n"
		<< "DATA\r\n"
		<< "From: " << from_fmt.str() << "\r\n"
		<< "To: " << to_fmt.str() << "\r\n"
		<< "Subject: " << subject << "\r\n"
		<< "\r\n";
	return header.str();
}

// static
bool LLMail::send(
	const std::string& header,
	const std::string& message,
	const char* from_address,
	const char* to_address)
{
	if(!from_address || !to_address)
	{
		llinfos << "send_mail reject: missing to and/or from address."
			<< llendl;
		return false;
	}

	// *FIX: this translation doesn't deal with a single period on a
	// line by itself.
	std::ostringstream rfc2822_msg;
	for(U32 i = 0; i < message.size(); ++i)
	{
		switch(message[i])
		{
		case '\0':
			break;
		case '\n':
			// *NOTE: this is kinda busted if we're fed \r\n
			rfc2822_msg << "\r\n";
			break;
		default:
			rfc2822_msg << message[i];
			break;
		}
	}

	if(!gMailEnabled)
	{
		llinfos << "send_mail reject: mail system is disabled: to=<"
			<< to_address << ">, from=<" << from_address
			<< ">" << llendl;
		// Any future interface to SMTP should return this as an
		// error.  --mark
		return true;
	}
	if(!gSockAddr)
	{
		llwarns << "send_mail reject: mail system not initialized: to=<"
			<< to_address << ">, from=<" << from_address
			<< ">" << llendl;
		return false;
	}

	if(!connect_smtp())
	{
		llwarns << "send_mail reject: SMTP connect failure: to=<"
			<< to_address << ">, from=<" << from_address
			<< ">" << llendl;
		return false;
	}

	std::ostringstream smtp_fmt;
	smtp_fmt << header << rfc2822_msg.str() << "\r\n" << ".\r\n" << "QUIT\r\n";
	std::string smtp_transaction = smtp_fmt.str();
	size_t original_size = smtp_transaction.size();
	apr_size_t send_size = original_size;
	apr_status_t status = apr_socket_send(
		gMailSocket,
		smtp_transaction.c_str(),
		(apr_size_t*)&send_size);
	disconnect_smtp();
	if(ll_apr_warn_status(status))
	{
		llwarns << "send_mail socket failure: unable to write "
			<< "to=<" << to_address
			<< ">, from=<" << from_address << ">"
			<< ", bytes=" << original_size
			<< ", sent=" << send_size << llendl;
		return false;
	}
	if(send_size >= LL_MAX_KNOWN_GOOD_MAIL_SIZE)
	{
		llwarns << "send_mail message has been shown to fail in testing "
			<< "when sending messages larger than " << LL_MAX_KNOWN_GOOD_MAIL_SIZE
			<< " bytes. The next log about success is potentially a lie." << llendl;
	}
	llinfos << "send_mail success: "
		<< "to=<" << to_address
		<< ">, from=<" << from_address << ">"
		<< ", bytes=" << original_size
		<< ", sent=" << send_size << llendl;

#if LL_LOG_ENTIRE_MAIL_MESSAGE_ON_SEND
	llinfos << rfc2822_msg.str() << llendl;
#endif
	return true;
}


// static
std::string LLMail::encryptIMEmailAddress(const LLUUID& from_agent_id,
											const LLUUID& to_agent_id,
											U32 time,
											const U8* secret,
											size_t secret_size)
{
#if LL_WINDOWS
	return "blowfish-not-supported-on-windows";
#else
	size_t data_size = 4 + UUID_BYTES + UUID_BYTES;
	// Convert input data into a binary blob
	std::vector<U8> data;
	data.resize(data_size);
	// *NOTE: This may suffer from endian issues.  Could be htonmemcpy.
	memcpy(&data[0], &time, 4);
	memcpy(&data[4], &from_agent_id.mData[0], UUID_BYTES);
	memcpy(&data[4 + UUID_BYTES], &to_agent_id.mData[0], UUID_BYTES);
	
	// Encrypt the blob
	LLBlowfishCipher cipher(secret, secret_size);
	size_t encrypted_size = cipher.requiredEncryptionSpace(data.size());
	U8* encrypted = new U8[encrypted_size];
	cipher.encrypt(&data[0], data_size, encrypted, encrypted_size);

	std::string address = LLBase32::encode(encrypted, encrypted_size);

	// Make it more pretty for humans.
	LLString::toLower(address);

	delete [] encrypted;

	return address;
#endif
}