Newer
Older
#include "common.h"
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <signal.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netdb.h>
#include <sys/select.h>
#include <errno.h>
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
#define MAXSTRLEN (1024)
static void
common_Log(FILE *pLog, const char *csFmtStr, va_list va_args);
static void
common_DoExit(int iExitCode);
static void
common_SigpipeHandle(int x);
/*function to wait for a specific FILE to be ready for reading*/
ERROR_STATUS
COMMON_ReadWaitFile(FILE *phF)
{
int iFDNum=fileno(phF);
return COMMON_ReadWaitFD(iFDNum);
}
/*function to wait for a specific File Descriptor (file, socket, pipe) to be ready for reading*/
ERROR_STATUS
COMMON_ReadWaitFD(int iFD)
{
int iStatus;
fd_set fds_r,fds_w,fds_ex;
FD_ZERO(&fds_r);
FD_ZERO(&fds_w);
FD_ZERO(&fds_ex);
FD_SET(iFD,&fds_r);
iStatus=select(iFD+1,&fds_r,&fds_w,&fds_ex,NULL);
if(iStatus>0) {
/*more one file ready (i.e. should only be one)*/
iStatus=SUCCESS;
} else {
/*something gone wrond or we are interrupted*/
iStatus=ERROR_INTERRUPT;
}
return iStatus;
}
// Function to read a proxy list from file and populate array of proxies
// Each proxy should be a separate line containing the url only
// e.g.:
//127.0.0.1:8423
//127.0.0.1:8424
//127.0.0.1:4433
ERROR_STATUS
COMMON_ReadProxyListFile(SSL *ptSSL,
const char *sFilename){
FILE *phF; // pointer to file
unsigned int uiCount = 0; // simple counters
char acLine [128]; // maximum size of line to read from
SPP_PROXY *patNewProxiesList=NULL;
if(ptSSL==NULL || sFilename==NULL) {
return INVALID_POINTER;
}
// Open file for reading
phF = fopen(sFilename,"r");
// Check for errors while opening file
if( phF == NULL ){
return FILE_NOT_READABLE;
}
uiCount=0;
// Read file line-by-line
while ( fgets ( acLine, sizeof(acLine), phF ) != NULL ) {
// Remove trailing newline (NOTE: strtoK is not thread safe)
strtok(acLine, "\n");
if(strlen(acLine)<=2) continue; //ignore blank lines
COMMON_AppendProxy(ptSSL,acLine);
/*TODO - log the proxy creation properly*/
COMMON_Log(stdout,"Proxy(%2u): %s\n",uiCount,acLine);
}
// Close file
fclose(phF);
return SUCCESS;
}
ERROR_STATUS
COMMON_InitProxySet(SSL *ptSSL)
{
while(ptSSL->proxies_len>0) {
ptSSL->proxies_len--;
OPENSSL_free(ptSSL->proxies[ptSSL->proxies_len]);
}
ptSSL->proxies_len=0;
memset(ptSSL->proxies,0,sizeof(ptSSL->proxies));
return SUCCESS;
}
ERROR_STATUS
COMMON_InitMulticontextSet(SSL *ptSSL)
{
while(ptSSL->slices_len>0) {
ptSSL->slices_len--;
OPENSSL_free(ptSSL->slices[ptSSL->slices_len]);
}
ptSSL->slices_len=0;
memset(ptSSL->slices,0,sizeof(ptSSL->slices));
return SUCCESS;
}
ERROR_STATUS
COMMON_AppendProxy(SSL *ptSSL,
const char *psProxyURL)
{
char *psProxyUrlCpy=NULL;
if(ptSSL->proxies_len>=(sizeof(ptSSL->proxies)/sizeof(ptSSL->proxies[0])))
return ARRAY_OVERFLOW;
/*SPP_generate_proxy will generate something with the string provide
* but there is no guarantee that it will be sensible if
* invalid data is passed in*/
psProxyUrlCpy=strdup(psProxyURL);
ptSSL->proxies[ptSSL->proxies_len] = SPP_generate_proxy(ptSSL, psProxyUrlCpy);
(ptSSL->proxies_len)++;
return SUCCESS;
}
ERROR_STATUS
{
char *psUrlCpy=NULL;
psUrlCpy=strdup(psURL);
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
return SUCCESS;
}
ERROR_STATUS
COMMON_AppendContext(SSL *ptSSL,
const char *psContextDesc)
{
char *psContextDescCpy=NULL;
if(ptSSL->slices_len>=(sizeof(ptSSL->slices)/sizeof(ptSSL->slices[0])))
return ARRAY_OVERFLOW;
psContextDescCpy=strdup(psContextDesc);
ptSSL->slices[ptSSL->slices_len] = SPP_generate_slice(ptSSL, psContextDescCpy);
ptSSL->slices_len++;
return SUCCESS;
}
ERROR_STATUS
COMMON_SetProxyAccessPermissionByID(SSL *ptSSL, int iSliceID, int iMiddleboxNum,
int bGrantRead, int bGrantWrite)
{
int *read_slices; size_t *read_slice_len;
int *write_slices; size_t *write_slice_len;
int reads_insert_index, write_insert_index;
int x,y,z;
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
return ARRAY_OVERFLOW;
read_slices=ptSSL->proxies[iMiddleboxNum]->read_slice_ids;
read_slice_len=&(ptSSL->proxies[iMiddleboxNum]->read_slice_ids_len);
write_slices=ptSSL->proxies[iMiddleboxNum]->write_slice_ids;
write_slice_len=&(ptSSL->proxies[iMiddleboxNum]->write_slice_ids_len);
/*handle empty case specially*/
if(*read_slice_len==0 && bGrantRead) {
read_slices[0]=iSliceID;
(*read_slice_len)++;
}
if(*write_slice_len==0 && bGrantWrite) {
write_slices[0]=iSliceID;
(*write_slice_len)++;
}
/*if we have just inserted the first record, this loop will
* terminate on first iteration*/
x=0;y=*read_slice_len;
while(y>x+1) {
z=(x+y)/2;
if(read_slices[z]>iSliceID) y=z;
else x=z;
}
if(bGrantRead) {
if(read_slices[x]!=iSliceID) {
if(*read_slice_len>y) { /*we have higher number slices to move up*/
memmove(&read_slices[x+1],&read_slices[x],(*read_slice_len-y)*sizeof(*read_slices));
}
(*read_slice_len)++;
} /*else we are re-granted an already granted access - NOP*/
} else { /*we are removing the permission if it is granted*/
if(read_slices[x]==iSliceID) {
if(*read_slice_len>y) { /*we have higher number slices to move up*/
memmove(&read_slices[x],&read_slices[x+1],(*read_slice_len-y)*sizeof(*read_slices));
}
(*read_slice_len)--;
} /*else we removing a non-existent permission - NOP*/
}
x=0;y=*write_slice_len;
while(y>x+1) {
z=(x+y)/2;
if(write_slices[z]>iSliceID) y=z;
else x=z;
}
if(bGrantWrite) {
if(write_slices[x]!=iSliceID) {
if(*write_slice_len>y) { /*we have higher number slices to move up*/
memmove(&write_slices[x+1],&write_slices[x],(*write_slice_len-y)*sizeof(*write_slices));
}
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
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
(*write_slice_len)++;
} /*else we are re-granted an already granted access - NOP*/
} else { /*we are removing the permission if it is granted*/
if(write_slices[x]==iSliceID) {
if(*write_slice_len>y) { /*we have higher number slices to move up*/
memmove(&write_slices[x],&write_slices[x+1],(*write_slice_len-y)*sizeof(*write_slices));
}
(*write_slice_len)--;
} /*else we removing a non-existent permission - NOP*/
}
return SUCCESS;
}
ERROR_STATUS
COMMON_TcpConnect(int *piSocket, const char *sHost, int iPort){
struct hostent *hp;
struct sockaddr_in addr;
int iOne=1;
// Resolve host
if(!(hp = gethostbyname(sHost)))
return NETWORK_CONNECT_FAIL;
memset(&addr, 0, sizeof(addr));
addr.sin_addr = *(struct in_addr*)
hp->h_addr_list[0];
addr.sin_family = AF_INET;
addr.sin_port = htons(iPort);
if((*piSocket=socket(AF_INET,SOCK_STREAM, IPPROTO_TCP))<0){
return NETWORK_CONNECT_FAIL;
}
/*I'm copying this option below*/
//set_nagle(*piSocket, 1);
setsockopt(*piSocket, IPPROTO_TCP, TCP_NODELAY, (char*)&iOne, sizeof(int));
if(connect(*piSocket,(struct sockaddr *)&addr, sizeof(addr))<0){
return NETWORK_CONNECT_FAIL;
}
return SUCCESS;
}
void
COMMON_LogErrorAndExit(int iExitCode, FILE *pLog, const char *csFmtStr, ...)
{
va_list va_args;
va_start(va_args,csFmtStr);
common_Log(pLog, csFmtStr,va_args);
va_end(va_args);
common_DoExit(iExitCode);
}
void
COMMON_CheckLogErrorAndExit(int iExitCode, FILE *pLog, const char *csFmtStr, ...)
{
va_list va_args;
if(iExitCode!=0) {
va_start(va_args,csFmtStr);
common_Log(pLog, csFmtStr,va_args);
va_end(va_args);
common_DoExit(iExitCode);
}
}
void
COMMON_Log(FILE *pLog, const char *csFmtStr, ...)
{
va_list va_args;
va_start(va_args,csFmtStr);
common_Log(pLog, csFmtStr,va_args);
va_end(va_args);
}
void
COMMON_CheckLog(int iExitCode, FILE *pLog, const char *csFmtStr, ...)
{
va_list va_args;
if(iExitCode!=0) {
va_start(va_args,csFmtStr);
common_Log(pLog, csFmtStr,va_args);
va_end(va_args);
}
}
char *gsPassword=NULL;
static int
password_cb(char *buf,int num, int rwflag,void *userdata)
{
if(gsPassword==NULL)
return 0;
if(num<strlen(gsPassword)+1)
return(0);
strcpy(buf,gsPassword);
return(strlen(gsPassword));
}
ERROR_STATUS
COMMON_InitializeSSLCtx(SSL_CTX **pptCtx,
const char *sMyKeyfile, const char *sMyPassword,
const char *sCAKeysFile,
unsigned int iID) /*todo - check the name of this in spec - the byte that identifies the middlebox number, client or server*/
{
const SSL_METHOD *meth;
SSL_CTX *ctx;
/* Global system initialization*/
SSL_library_init();
SSL_load_error_strings();
/* Set up a SIGPIPE handler */
signal(SIGPIPE,common_SigpipeHandle);
if(iID==ID_CLIENT || iID==ID_SERVER) {
meth = SPP_method();
} else if(iID >=ID_MIDDLEBOX_MIN && iID<=ID_MIDDLEBOX_MAX) {
meth = SPP_proxy_method();
} else {
return INTEGER_OUT_OF_RANGE;
}
ctx = SSL_CTX_new(meth);
/* Specify the cipher suites that may be used. */
if (!SSL_CTX_set_cipher_list(ctx, "DHE-RSA-AES128-SHA256")) {
return ERROR_IN_LIBRARY_CALL;
}
/* Load the CAs*/
if(!(SSL_CTX_load_verify_locations(ctx,
sCAKeysFile,NULL)))
return FILE_NOT_READABLE;
/* Load our certificate*/
if(!(SSL_CTX_use_certificate_chain_file(ctx,
sMyKeyfile)))
return FILE_NOT_READABLE;
/*set the routine to handle passing in the passowrd for our private key*/
if(gsPassword!=NULL) {
free(gsPassword); gsPassword=NULL;
}
if(sMyPassword!=NULL){
gsPassword=strdup(sMyPassword);
}
SSL_CTX_set_default_passwd_cb(ctx,
password_cb);
/*load our private key*/
if(!(SSL_CTX_use_PrivateKey_file(ctx,
sMyKeyfile,SSL_FILETYPE_PEM)))
return FILE_NOT_READABLE;
*pptCtx=ctx;
return SUCCESS;
}
void
COMMON_DestroyCtx(SSL_CTX *ptCtx)
{
if(gsPassword!=NULL) {
free(gsPassword); gsPassword=NULL;
SSL_CTX_free(ptCtx);
}
}
static void
common_Log(FILE *pLog, const char *csFmtStr, va_list va_args)
{
assert(pLog!=NULL);
assert(csFmtStr!=NULL);
assert(strnlen(csFmtStr,MAXSTRLEN)<MAXSTRLEN);
vfprintf(pLog,csFmtStr,va_args);
fflush(pLog);
}
static void
common_DoExit(int iExitCode)
{
exit(iExitCode);
}
static void
common_SigpipeHandle(int x)
{
UNUSED(x);
}
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
char* COMMON_MakeNullTerminatedCopy (const char* buf, const unsigned int length)
{
char* retBuf = malloc(length + 1);
memcpy(retBuf, buf, length);
retBuf[length] = 0;
return retBuf;
}
long getMicrotime()
{
struct timeval currentTime;
gettimeofday(¤tTime, NULL);
return currentTime.tv_sec * (int)1e6 + currentTime.tv_usec;
}
char* COMMON_WriteJSONFile (cJSON* data, char* source)
{
char fileNameBuf[128];
sprintf(fileNameBuf, "%s_%lu.json", source, getMicrotime());
FILE* f = fopen (fileNameBuf, "w");
char* jsonString = cJSON_Print(data);
fwrite(jsonString, 1, strlen(jsonString), f);
fclose(f);
free(jsonString);
return strdup(fileNameBuf);
}
cJSON* COMMON_ReadJSONFile (char* filename)
{
FILE * f = fopen (filename, "r");
fseek (f, 0, SEEK_END);
int length = ftell (f);
fseek (f, 0, SEEK_SET);
char* buffer = malloc (length);
if (buffer)
{
fread (buffer, 1, length, f);
}
fclose (f);
cJSON* json = cJSON_Parse(buffer);
free(buffer);
return json;
}
int COMMON_Base64Encode(const unsigned char* buffer, size_t length, char** b64text)
{
BIO *bio, *b64;
BUF_MEM *bufferPtr;
b64 = BIO_new(BIO_f_base64());
bio = BIO_new(BIO_s_mem());
bio = BIO_push(b64, bio);
BIO_set_flags(bio, 0); // BIO_FLAGS_BASE64_NO_NL); //Ignore newlines - write everything in one line
BIO_write(bio, buffer, length);
BIO_flush(bio);
BIO_get_mem_ptr(bio, &bufferPtr);
BIO_set_close(bio, BIO_NOCLOSE);
BIO_free_all(bio);
*b64text=(*bufferPtr).data;
return (0); //success
}
size_t common_calcDecodeLength(const char* b64input)
{ //Calculates the length of a decoded string
size_t len = strlen(b64input),
padding = 0;
if (b64input[len-1] == '=' && b64input[len-2] == '=') //last two chars are =
padding = 2;
else if (b64input[len-1] == '=') //last char is =
padding = 1;
return (len*3)/4 - padding;
}
int COMMON_Base64Decode(char* b64message, unsigned char** buffer, size_t* length)
{
BIO *bio, *b64;
int decodeLen = common_calcDecodeLength(b64message);
*buffer = (unsigned char*)malloc(decodeLen + 1);
(*buffer)[decodeLen] = '\0';
bio = BIO_new_mem_buf(b64message, -1);
b64 = BIO_new(BIO_f_base64());
bio = BIO_push(b64, bio);
BIO_set_flags(bio, BIO_FLAGS_BASE64_NO_NL); //Do not use newlines to flush buffer
*length = BIO_read(bio, *buffer, strlen(b64message));
assert(*length == decodeLen); //length should equal decodeLen, else something went horribly wrong
BIO_free_all(bio);
return (0); //success
}
char* COMMON_CallExternalProcess(const char* commandString, unsigned int* length)
{
FILE* p = popen(commandString, "r");
// Ugh. Do this better.
const unsigned int bufSize = 65536;
char* responseBuf = malloc(bufSize);
memset(responseBuf, 0, bufSize);
char* ptr = responseBuf;
int ch;
unsigned int count = 0;
while( (ch=fgetc(p)) != EOF)
{
*ptr++ = ch;
count++;
}
int returnCode = WEXITSTATUS(pclose(p));
*length = count;
return responseBuf;
}
#define MAX_CERT_FIELD_LENGTH 1024
#define SHA1LEN 20
void hex_encode(unsigned char* readbuf, void *writebuf, size_t len)
{
for(size_t i=0; i < len; i++) {
char *l = (char*) (2*i + ((intptr_t) writebuf));
sprintf(l, "%02x", readbuf[i]);
}
}
void COMMON_PrintCertificateDetails (X509* cert)
{
if (NULL == cert) {
printf ("\tNo certificate\n");
return;
}
char subj[MAX_CERT_FIELD_LENGTH+1];
char issuer[MAX_CERT_FIELD_LENGTH+1];
X509_NAME_oneline(X509_get_subject_name(cert), subj, MAX_CERT_FIELD_LENGTH);
X509_NAME_oneline(X509_get_issuer_name(cert), issuer, MAX_CERT_FIELD_LENGTH);
printf("\tSubject: %s\n", subj);
printf("\tIssuer: %s\n", issuer);
char buf[SHA1LEN];
const EVP_MD *digest = EVP_sha1();
unsigned len;
int rc = X509_digest(cert, digest, (unsigned char*) buf, &len);
if (rc == 0 || len != SHA1LEN) {
printf ("\tFailed to get SHA1 fingerprint\n");
}
char strbuf[2*SHA1LEN+1];
hex_encode(buf, strbuf, SHA1LEN);
printf ("\tFingerprint: %s\n", strbuf);
}