Newer
Older
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
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
#include "common.h"
#include <stdbool.h>
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <sys/wait.h>
#include <unistd.h>
#include "cJSON.h"
#define CA_LIST "ca.pem"
#define KEYFILE "server.pem"
#define PASSWORD "password"
#define DHFILE "dh1024.pem"
#define BUFSIZZ 20000
#define DISABLE_NAGLE 0
#ifdef DEBUG
#define DEBUG_PRINT(...) do{ fprintf( stdout, __VA_ARGS__ ); } while( false )
#else
#define DEBUG_PRINT(...) do{ } while ( false )
#endif
char* handler_command = NULL;
// -------------------------------------------------------------
// Load parameters from "dh1024.pem"
// -------------------------------------------------------------
void load_dh_params(SSL_CTX *ctx, char *file)
{
DH *ret=0;
BIO *bio;
if ((bio=BIO_new_file(file,"r")) == NULL)
{
printf ("[SERVER ERROR] Couldn't open DH file %s\n", file);
exit(0);
}
ret = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
BIO_free(bio);
if(SSL_CTX_set_tmp_dh(ctx,ret) < 0)
{
printf ("[SERVER ERROR] Couldn't set DH parameters\n");
exit(0);
}
}
// -------------------------------------------------------------
// Listen TCP socket
// -------------------------------------------------------------
int tcp_listen(){
int sock;
struct sockaddr_in sin;
int val = 1;
// Create socket, allocate memory and set sock options
if((sock=socket(AF_INET,SOCK_STREAM,0)) < 0)
{
printf("[SERVER] Couldn't make socket");
exit(-1);
}
memset(&sin, 0, sizeof(sin));
sin.sin_addr.s_addr = INADDR_ANY;
sin.sin_family = AF_INET;
sin.sin_port = htons(DEFAULT_SERVER_PORT);
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val,sizeof(val));
/*
if (DISABLE_NAGLE == 1)
set_nagle(sock, 1);
*/
// Bind to socket
if(bind(sock,(struct sockaddr *)&sin, sizeof(sin))<0)
{
printf ("[SERVER] Could not bind to port %d", sin.sin_port);
}
// Listen to socket
listen(sock,5);
// Return socket descriptor
return(sock);
}
// -------------------------------------------------------------
// Check for SSL_write error (just write at this point)
// -- TO DO: check behavior per slice
// -------------------------------------------------------------
void check_SSL_write_error(SSL *ssl, int r, int request_len)
{
int errorCode = SSL_get_error(ssl, r);
switch(errorCode)
{
case SSL_ERROR_NONE:
if(request_len != r)
{
printf("[SERVER ERROR] Incomplete write!");
exit(1);
}
break;
default:
{
printf("[SERVER ERROR] SSL error %d", errorCode);
exit(1);
}
}
}
cJSON* createErrorResponse (cJSON* recvData)
{
cJSON* root = cJSON_CreateObject();
cJSON* sliceArray = cJSON_AddArrayToObject(root, "slices");
cJSON* inputSlices = cJSON_GetObjectItem(recvData, "slices");
cJSON* inputSlice = NULL;
cJSON_ArrayForEach(inputSlice, inputSlices)
{
cJSON* outputSlice = cJSON_CreateObject();
cJSON_AddNumberToObject(outputSlice, "slice", cJSON_GetObjectItem(inputSlice, "slice")->valueint);
cJSON_AddStringToObject(outputSlice, "data", "Error");
cJSON_AddItemToArray(sliceArray, outputSlice);
}
return root;
}
cJSON* call_response_handler(char* inputJsonFile, cJSON* recvData)
{
DEBUG_PRINT("[SERVER DEBUG] Calling response handler with file %s\n", inputJsonFile);
char commandBuf[256];
sprintf(commandBuf, "%s %s", handler_command, inputJsonFile);
int bufLen = 0;
char* response = COMMON_CallExternalProcess(commandBuf, &bufLen);
DEBUG_PRINT ("[SERVER DEBUG] Received %lu bytes from handler\n", strlen(response));
cJSON* returnJson = cJSON_Parse(response);
if (returnJson) return returnJson;
printf ("[SERVER ERROR] Could not parse json from command handler %s - received { %s }\n", handler_command, response);
return createErrorResponse(recvData);
}
// -------------------------------------------------------------
// Serve requests in browser-like mode
// -------------------------------------------------------------
int send_response(SSL *ssl, int s, char *proto)
{
DEBUG_PRINT("[SERVER DEBUG] Send_response() called\n");
SPP_SLICE *slice;
SPP_CTX *ctx;
char buf[BUFSIZZ];
int errorCode = SSL_ERROR_NONE;
int expectedSlices = 0;
int slicesSeen = 0;
cJSON* recvData = cJSON_CreateObject();
cJSON* sliceDataArray = cJSON_AddArrayToObject(recvData, "slices");
while ( (errorCode == SSL_ERROR_NONE) && ( expectedSlices == 0 || expectedSlices > slicesSeen))
{
if (expectedSlices == 0)
{
DEBUG_PRINT("[SERVER DEBUG] Entering read loop for first time\n");
}
else
{
DEBUG_PRINT("[SERVER DEBUG] Entering read loop, seen %d / %d slices\n", slicesSeen, expectedSlices);
}
DEBUG_PRINT("[SERVER DEBUG] Reading SPP record\n");
int r = SPP_read_record(ssl, buf, BUFSIZZ, &slice, &ctx);
errorCode = SSL_get_error(ssl, r);
if (errorCode != SSL_ERROR_NONE)
{
printf("[SERVER ERROR] SSL read error code %d\n", errorCode);
break;
}
if (expectedSlices == 0)
{
expectedSlices = ssl->slices_len;
DEBUG_PRINT("[SERVER DEBUG] Expecting %lu slices\n", ssl->slices_len);
}
DEBUG_PRINT("[SERVER DEBUG] Read %d bytes from slice %d (%s)\n", r, slice->slice_id, slice->purpose);
DEBUG_PRINT("[SERVER DEBUG] { %s }\n", buf);
// Print proxies
for (int i = 0; i < ssl->proxies_len; i++)
{
DEBUG_PRINT(" [SERVER DEBUG] Proxy: %s\n", ssl->proxies[i]->address);
}
for (int i = 0; i < ssl->slices_len; i++)
{
DEBUG_PRINT(" [SERVER DEBUG] Slice with ID %d and purpose %s\n", ssl->slices[i]->slice_id, ssl->slices[i]->purpose);
}
slicesSeen++;
cJSON* sliceData = cJSON_CreateObject();
cJSON_AddNumberToObject(sliceData, "slice", slice->slice_id);
cJSON_AddStringToObject(sliceData, "slicePurpose", slice->purpose);
cJSON_AddStringToObject(sliceData, "data", COMMON_MakeNullTerminatedCopy(buf, r));
cJSON_AddItemToArray(sliceDataArray, sliceData);
}
char* sliceDataString = cJSON_Print(recvData);
printf("[SERVER] Received\n%s\n", sliceDataString);
free(sliceDataString);
char* filename = COMMON_WriteJSONFile(recvData, "Server");
DEBUG_PRINT("[SERVER DEBUG] Data written to %s\n", filename);
cJSON* responseData = call_response_handler(filename, recvData);
char* responseDataStr = cJSON_Print(responseData);
printf("[SERVER] Returning following data\n");
printf("%s\n", responseDataStr);
cJSON* responseSlices = cJSON_GetObjectItem(responseData, "slices");
cJSON* outputSlice = NULL;
cJSON_ArrayForEach(outputSlice, responseSlices)
{
int sliceIndex = cJSON_GetObjectItem(outputSlice, "slice")->valueint;
char* sliceData = cJSON_GetObjectItem(outputSlice, "data")->valuestring;
DEBUG_PRINT("[SERVER DEBUG] Writing %lu bytes as record to slice %d\n", strlen(sliceData), sliceIndex);
int r = SPP_write_record(ssl, sliceData, strlen(sliceData), SPP_get_slice_by_id(ssl, sliceIndex));
check_SSL_write_error(ssl, r, strlen(sliceData));
}
free(filename);
cJSON_Delete(recvData);
cJSON_Delete(responseData);
DEBUG_PRINT ("[SERVER DEBUG] Shutting down SSL\n");
int r = SSL_shutdown(ssl);
if( !r )
{
shutdown(s, 1);
r = SSL_shutdown(ssl);
}
// Verify that shutdown was good
switch(r){
case 1:
break; // Success
case 0:
case -1:
default: // Error
printf ("[SERVER ERROR] Shutdown failed with code %d\n", r);
exit(1);
}
// free SSL
SSL_free(ssl);
return 0;
}
// Main function
int main(int argc, char **argv)
{
BIO *sbio;
SSL *ssl;
SSL_CTX *ctx;
char* proto = "spp";
int sock, newsock;
int pid;
int status;
if (argc == 1)
{
// If no handler is specified, simply echo the data received from the client
handler_command = "cat";
}
else
{
char tempBuf[1024];
memset(tempBuf, 0, 1024);
int written = 0;
for (int i = 1; i < argc; i++)
{
written += snprintf(tempBuf + written, 1024 - written, "%s ", argv[i]);
}
handler_command = strdup(tempBuf);
}
// Print out configuration
DEBUG_PRINT("[SERVER DEBUG] Server starting\n");
DEBUG_PRINT("[SERVER DEBUG] Configuration:\n");
DEBUG_PRINT("[SERVER DEBUG] KeyFile: %s\n", KEYFILE);
DEBUG_PRINT("[SERVER DEBUG] DHFile: %s\n", DHFILE);
DEBUG_PRINT("[SERVER DEBUG] Proto: %s\n", proto);
DEBUG_PRINT("[SERVER DEBUG] Handler command { %s }\n", handler_command);
// Build SSL context
DEBUG_PRINT("[SERVER DEBUG] Initialising ctx\n");
status = COMMON_InitializeSSLCtx(&ctx, KEYFILE, PASSWORD, CA_LIST, ID_SERVER);
DEBUG_PRINT("[SERVER DEBUG] Loading DH parameters\n");
load_dh_params(ctx, DHFILE);
// Listen on socket
DEBUG_PRINT("[SERVER DEBUG] Listening on TCP port %d\n", DEFAULT_SERVER_PORT);
sock = tcp_listen();
int nConn = 0;
bool report = true;
while (1)
{
DEBUG_PRINT("[SERVER DEBUG] Waiting on TCP accept...\n");
newsock = accept(sock, 0, 0);
if (newsock < 0)
{
printf("[SERVER ERROR] Socket accept failed with code %d\n", newsock);
exit(1);
}
else
{
DEBUG_PRINT("[SERVER DEBUG] Accepted new connection %d\n", sock);
}
// Keep track of number of connections
nConn++;
DEBUG_PRINT("[SERVER DEBUG] %d connections\n", nConn);
// Fork a new process
signal(SIGCHLD, SIG_IGN);
pid = fork();
if (pid == 0)
{
// In child process
if (pid == -1)
{
printf ("[SERVER ERROR] Forking process for new connection failed");
exit(1);
}
DEBUG_PRINT("[SERVER DEBUG] child process close old socket and operate on new one\n");
close(sock);
sbio = BIO_new_socket(newsock, BIO_NOCLOSE);
ssl = SSL_new(ctx);
SSL_set_bio(ssl, sbio, sbio);
// Wait on SSL Accept
int sslAcceptResult = SSL_accept(ssl);
X509* server_cert = SSL_get_certificate(ssl);
printf ("[SERVER] Server certificate:\n");
COMMON_PrintCertificateDetails(server_cert);
X509_free(server_cert);
X509* client_cert = SSL_get_peer_certificate(ssl);
printf ("[Server] Client certificate:\n");
COMMON_PrintCertificateDetails(client_cert);
X509_free(client_cert);
if (sslAcceptResult <= 0)
{
printf("[SERVER ERROR] SSL accept error\n");
exit(0);
}
else
{
DEBUG_PRINT("[SERVER DEBUG] SPP accept OK\n");
}
// Send a response back
DEBUG_PRINT("[SERVER DEBUG] Sending response back\n");
send_response(ssl, newsock, proto);
// Correctly end child process
DEBUG_PRINT("[SERVER DEBUG] Ending child process\n");
shutdown(newsock, SHUT_RDWR);
close(newsock);
exit(0);
}
else
{
DEBUG_PRINT("[SERVER DEBUG] Parent process closing new socket\n");
close(newsock);
}
}
// Wait for forked process to complete
wait(&status);
// Clean context
COMMON_DestroyCtx(ctx);
// Correctly end parent process
exit(0);
}