### Bug Summary

File: | epan/dissectors/packet-knxip_decrypt.c
Warning: | line 810, column 3 Opened stream never closed. Potential resource leak

### Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name packet-knxip_decrypt.c -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 2 -fhalf-no-semantic-interposition -fno-delete-null-pointer-checks -mframe-pointer=all -relaxed-aliasing -fmath-errno -ffp-contract=on -fno-rounding-math -ffloat16-excess-precision=fast -fbfloat16-excess-precision=fast -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/builds/wireshark/wireshark/build -fcoverage-compilation-dir=/builds/wireshark/wireshark/build -resource-dir /usr/lib/llvm-21/lib/clang/21 -isystem /usr/include/glib-2.0 -isystem /usr/lib/x86_64-linux-gnu/glib-2.0/include -isystem /builds/wireshark/wireshark/epan/dissectors -isystem /builds/wireshark/wireshark/build/epan/dissectors -isystem /usr/include/mit-krb5 -isystem /usr/include/libxml2 -isystem /builds/wireshark/wireshark/epan -D G_DISABLE_DEPRECATED -D G_DISABLE_SINGLE_INCLUDES -D WS_BUILD_DLL -D WS_DEBUG -D WS_DEBUG_UTF_8 -I /builds/wireshark/wireshark/build -I /builds/wireshark/wireshark -I /builds/wireshark/wireshark/include -D _GLIBCXX_ASSERTIONS -internal-isystem /usr/lib/llvm-21/lib/clang/21/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/14/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fmacro-prefix-map=/builds/wireshark/wireshark/= -fmacro-prefix-map=/builds/wireshark/wireshark/build/= -fmacro-prefix-map=../= -Wno-format-nonliteral -std=gnu11 -ferror-limit 19 -fvisibility=hidden -fwrapv -fwrapv-pointer -fstrict-flex-arrays=3 -stack-protector 2 -fstack-clash-protection -fcf-protection=full -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fexceptions -fcolor-diagnostics -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /builds/wireshark/wireshark/sbout/2026-01-18-100336-3603-1 -x c /builds/wireshark/wireshark/epan/dissectors/packet-knxip_decrypt.c

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1 | /* packet-knxip_decrypt.c
2 | * Decryption keys and decryption functions for KNX/IP Dissector
3 | * Copyright 2018, ise GmbH <Ralf.Nasilowski@ise.de>
4 | *
5 | * Wireshark - Network traffic analyzer
6 | * By Gerald Combs <gerald@wireshark.org>
7 | * Copyright 1998 Gerald Combs
8 | *
9 | * SPDX-License-Identifier: GPL-2.0-or-later
10 | */
11 |
12 | #include "config.h"
13 |
14 | #define WS_LOG_DOMAIN"packet-knxip" "packet-knxip"
15 |
16 | #include <wsutil/file_util.h>
17 | #include <epan/proto.h>
18 | #include "packet-knxip_decrypt.h"
19 | #include <epan/wmem_scopes.h>
20 | #include <wsutil/wsgcrypt.h>
21 | #include <wsutil/strtoi.h>
22 | #include <wsutil/wslog.h>
23 | #include <wsutil/inet_addr.h>
24 | #include <libxml/tree.h>
25 | #include <libxml/parser.h>
26 | #include <libxml/xpath.h>
27 |
28 | #define TEXT_BUFFER_SIZE128 128
29 |
30 | #define IPA_SIZE4 4 // = size of IPv4 address
31 |
32 | #define BASE64_KNX_KEY_LENGTH24 24 // = length of base64 encoded KNX key
33 |
34 | struct knx_keyring_mca_keys* knx_keyring_mca_keys;
35 | struct knx_keyring_ga_keys* knx_keyring_ga_keys;
36 | struct knx_keyring_ga_senders* knx_keyring_ga_senders;
37 | struct knx_keyring_ia_keys* knx_keyring_ia_keys;
38 | struct knx_keyring_ia_seqs* knx_keyring_ia_seqs;
39 |
40 | // Encrypt 16-byte block via AES
41 | static bool_Bool encrypt_block( const uint8_t key[ KNX_KEY_LENGTH16 ], const uint8_t plain[ KNX_KEY_LENGTH16 ], uint8_t p_crypt[ KNX_KEY_LENGTH16 ] )
42 | {
43 | gcry_cipher_hd_t cryptor = NULL((void*)0);
44 | gcry_error_t err;
45 | err = gcry_cipher_open( &cryptor, GCRY_CIPHER_AES128GCRY_CIPHER_AES, GCRY_CIPHER_MODE_CBC, 0 );
46 | if (err != 0) {
47 | ws_debug("failed to open AES128 cipher handle: %s/%s", gcry_strsource(err), gcry_strerror(err))do { if (1) { ws_log_full("packet-knxip", LOG_LEVEL_DEBUG, "epan/dissectors/packet-knxip_decrypt.c" , 47, __func__, "failed to open AES128 cipher handle: %s/%s", gcry_strsource(err), gcry_strerror(err)); } } while (0);
48 | return false0;
49 | }
50 | err = gcry_cipher_setkey( cryptor, key, KNX_KEY_LENGTH16 );
51 | if (err != 0) {
52 | ws_debug("failed to set AES128 cipher key: %s/%s", gcry_strsource(err), gcry_strerror(err))do { if (1) { ws_log_full("packet-knxip", LOG_LEVEL_DEBUG, "epan/dissectors/packet-knxip_decrypt.c" , 52, __func__, "failed to set AES128 cipher key: %s/%s", gcry_strsource (err), gcry_strerror(err)); } } while (0);
53 | gcry_cipher_close( cryptor );
54 | return false0;
55 | }
56 | err = gcry_cipher_encrypt( cryptor, p_crypt, KNX_KEY_LENGTH16, plain, KNX_KEY_LENGTH16 );
57 | if (err != 0) {
58 | ws_debug("failed to encrypt AES128: %s/%s", gcry_strsource(err), gcry_strerror(err))do { if (1) { ws_log_full("packet-knxip", LOG_LEVEL_DEBUG, "epan/dissectors/packet-knxip_decrypt.c" , 58, __func__, "failed to encrypt AES128: %s/%s", gcry_strsource (err), gcry_strerror(err)); } } while (0);
59 | gcry_cipher_close( cryptor );
60 | return false0;
61 | }
62 | gcry_cipher_close( cryptor );
63 | return true1;
64 | }
65 |
66 | // Create B_0 for CBC-MAC
67 | static void build_b0( uint8_t p_result[ KNX_KEY_LENGTH16 ], const uint8_t* nonce, uint8_t nonce_length )
68 | {
69 | DISSECTOR_ASSERT( nonce_length <= KNX_KEY_LENGTH )((void) ((nonce_length <= 16) ? (void)0 : (proto_report_dissector_bug ("%s:%u: failed assertion \"%s\"", "epan/dissectors/packet-knxip_decrypt.c" , 69, "nonce_length <= 16"))));
70 | if( nonce_length ) memcpy( p_result, nonce, nonce_length );
71 | memset( p_result + nonce_length, 0, KNX_KEY_LENGTH16 - nonce_length );
72 | }
73 |
74 | // Create Ctr_0 for CCM encryption/decryption
75 | static void build_ctr0( uint8_t p_result[ KNX_KEY_LENGTH16 ], const uint8_t* nonce, uint8_t nonce_length )
76 | {
77 | build_b0( p_result, nonce, nonce_length );
78 | p_result[ KNX_KEY_LENGTH16 - 2 ] = 0xFF;
79 | }
80 |
81 | // Calculate MAC for KNX IP Security or KNX Data Security
82 | void knx_ccm_calc_cbc_mac(uint8_t p_mac[ KNX_KEY_LENGTH16 ], const uint8_t key[ KNX_KEY_LENGTH16 ],
83 | const uint8_t* a_bytes, int a_length, const uint8_t* p_bytes, int p_length,
84 | const uint8_t b_0[ KNX_KEY_LENGTH16 ] )
85 | {
86 | uint8_t plain[ KNX_KEY_LENGTH16 ];
87 | uint8_t b_pos;
88 |
89 | // Add B_0
90 | memcpy( plain, b_0, KNX_KEY_LENGTH16 );
91 | if (!encrypt_block( key, plain, p_mac )) {
92 | memset(p_mac, 0, KNX_KEY_LENGTH16);
93 | return;
94 | }
95 |
96 | // Add a_length
97 | plain[ 0 ] = (uint8_t) ((a_length >> 8) ^ p_mac[ 0 ]);
98 | plain[ 1 ] = (uint8_t) ((a_length & 0xFF) ^ p_mac[ 1 ]);
99 | b_pos = 2;
100 |
101 | // Add a_bytes directly followed by p_bytes
102 | while( a_length || p_length )
103 | {
104 | while( a_length && b_pos < KNX_KEY_LENGTH16 )
105 | {
106 | plain[ b_pos ] = *a_bytes++ ^ p_mac[ b_pos ];
107 | --a_length;
108 | ++b_pos;
109 | }
110 |
111 | while( p_length && b_pos < KNX_KEY_LENGTH16 )
112 | {
113 | plain[ b_pos ] = *p_bytes++ ^ p_mac[ b_pos ];
114 | --p_length;
115 | ++b_pos;
116 | }
117 |
118 | while( b_pos < KNX_KEY_LENGTH16 )
119 | {
120 | plain[ b_pos ] = p_mac[ b_pos ];
121 | ++b_pos;
122 | }
123 |
124 | if (!encrypt_block( key, plain, p_mac )) {
125 | memset(p_mac, 0, KNX_KEY_LENGTH16);
126 | return;
127 | }
128 |
129 | b_pos = 0;
130 | }
131 | }
132 |
133 | // Calculate MAC for KNX IP Security, using 6-byte Sequence ID
134 | void knxip_ccm_calc_cbc_mac( uint8_t p_mac[ KNX_KEY_LENGTH16 ], const uint8_t key[ KNX_KEY_LENGTH16 ],
135 | const uint8_t* a_bytes, int a_length, const uint8_t* p_bytes, int p_length,
136 | const uint8_t* nonce, uint8_t nonce_length )
137 | {
138 | uint8_t b_0[ KNX_KEY_LENGTH16 ];
139 | build_b0( b_0, nonce, nonce_length );
140 | b_0[ KNX_KEY_LENGTH16 - 2 ] = (uint8_t) (p_length >> 8);
141 | b_0[ KNX_KEY_LENGTH16 - 1 ] = (uint8_t) (p_length & 0xFF);
142 | knx_ccm_calc_cbc_mac( p_mac, key, a_bytes, a_length, p_bytes, p_length, b_0 );
143 | }
144 |
145 | // Encrypt for KNX IP Security or KNX Data Security
146 | uint8_t* knx_ccm_encrypt(wmem_allocator_t* scope, uint8_t* p_result, const uint8_t key[ KNX_KEY_LENGTH16 ], const uint8_t* p_bytes, int p_length,
147 | const uint8_t* mac, uint8_t mac_length, const uint8_t ctr_0[ KNX_KEY_LENGTH16 ], uint8_t s0_bytes_used_for_mac )
148 | {
149 | if( p_length >= 0 && !(p_length && !p_bytes) )
150 | {
151 | // NB: mac_length = 16 (for IP Security), or 4 (for Data Security)
152 |
153 | uint8_t* result = p_result ? p_result : (uint8_t*) wmem_alloc(scope, p_length + mac_length );
154 |
155 | uint8_t* dest = result;
156 |
157 | uint8_t ctr[ KNX_KEY_LENGTH16 ];
158 | uint8_t mask[ KNX_KEY_LENGTH16 ];
159 | uint8_t mask_0[ KNX_KEY_LENGTH16 ];
160 | uint8_t b_pos;
161 |
162 | // Encrypt ctr_0 for mac
163 | memcpy( ctr, ctr_0, KNX_KEY_LENGTH16 );
164 | if (!encrypt_block( key, ctr, mask_0 )) {
165 | if (!p_result) wmem_free(scope, result);
166 | return NULL((void*)0);
167 | }
168 |
169 | // Encrypt p_bytes with rest of S_0, only if mac_length < 16.
170 | b_pos = s0_bytes_used_for_mac;
171 | while (p_length && b_pos < KNX_KEY_LENGTH16 )
172 | {
173 | *dest++ = mask_0[b_pos++] ^ *p_bytes++;
174 | --p_length;
175 | }
176 |
177 | // Encrypt p_bytes
178 | while( p_length )
179 | {
180 | // Increment and encrypt ctr
181 | ++ctr[ KNX_KEY_LENGTH16 - 1 ];
182 | if (!encrypt_block( key, ctr, mask )) {
183 | if (!p_result) wmem_free(scope, result);
184 | return NULL((void*)0);
185 | }
186 |
187 | // Encrypt input block via encrypted ctr
188 | b_pos = 0;
189 | while( p_length && b_pos < KNX_KEY_LENGTH16 )
190 | {
191 | *dest++ = mask[ b_pos++] ^ *p_bytes++;
192 | --p_length;
193 | }
194 | }
195 |
196 | if( mac )
197 | {
198 | if( mac_length > KNX_KEY_LENGTH16 )
199 | {
200 | mac_length = KNX_KEY_LENGTH16;
201 | }
202 |
203 | // Encrypt and append mac
204 | b_pos = 0;
205 | while( mac_length )
206 | {
207 | *dest++ = mask_0[ b_pos++] ^ *mac++;
208 | --mac_length;
209 | }
210 | }
211 |
212 | return result;
213 | }
214 |
215 | return NULL((void*)0);
216 | }
217 |
218 | // Encrypt for KNX IP Security (with 16-byte MAC and Nonce based on 6-byte Sequence ID)
219 | uint8_t* knxip_ccm_encrypt(wmem_allocator_t* scope, uint8_t* p_result, const uint8_t key[ KNX_KEY_LENGTH16 ], const uint8_t* p_bytes, int p_length,
220 | const uint8_t mac[KNX_KEY_LENGTH16], const uint8_t* nonce, uint8_t nonce_length )
221 | {
222 | uint8_t ctr_0[ KNX_KEY_LENGTH16 ];
223 | build_ctr0( ctr_0, nonce, nonce_length );
224 | return knx_ccm_encrypt(scope, p_result, key, p_bytes, p_length, mac, KNX_KEY_LENGTH16, ctr_0, KNX_KEY_LENGTH16 );
225 | }
226 |
227 | // Decrypt for KNX-IP Security (with 16-byte MAC and Nonce based on 6-byte Sequence ID)
228 | uint8_t* knxip_ccm_decrypt(wmem_allocator_t* scope, uint8_t* p_result, const uint8_t key[ KNX_KEY_LENGTH16 ], const uint8_t* crypt, int crypt_length,
229 | const uint8_t* nonce, uint8_t nonce_length )
230 | {
231 | int p_length = crypt_length - KNX_KEY_LENGTH16;
232 | uint8_t ctr_0[ KNX_KEY_LENGTH16 ];
233 | build_ctr0( ctr_0, nonce, nonce_length );
234 | return knx_ccm_encrypt(scope, p_result, key, crypt, p_length, crypt + p_length, KNX_KEY_LENGTH16, ctr_0, KNX_KEY_LENGTH16 );
235 | }
236 |
237 | static void fprintf_hex( FILE* f, const uint8_t* data, uint8_t length )
238 | {
239 | for( ; length; --length ) fprintf( f, " %02X", *data++ );
240 | fputc( '\n', f );
241 | }
242 |
243 | static void clear_keyring_data( void )
244 | {
245 | while( knx_keyring_mca_keys )
246 | {
247 | struct knx_keyring_mca_keys* mca_key = knx_keyring_mca_keys;
248 | knx_keyring_mca_keys = mca_key->next;
249 | wmem_free( wmem_epan_scope(), mca_key );
250 | }
251 |
252 | while( knx_keyring_ga_keys )
253 | {
254 | struct knx_keyring_ga_keys* ga_key = knx_keyring_ga_keys;
255 | knx_keyring_ga_keys = ga_key->next;
256 | wmem_free( wmem_epan_scope(), ga_key );
257 | }
258 |
259 | while( knx_keyring_ga_senders )
260 | {
261 | struct knx_keyring_ga_senders* ga_sender = knx_keyring_ga_senders;
262 | knx_keyring_ga_senders = ga_sender->next;
263 | wmem_free( wmem_epan_scope(), ga_sender );
264 | }
265 |
266 | while( knx_keyring_ia_keys )
267 | {
268 | struct knx_keyring_ia_keys* ia_key = knx_keyring_ia_keys;
269 | knx_keyring_ia_keys = ia_key->next;
270 | wmem_free( wmem_epan_scope(), ia_key );
271 | }
272 |
273 | while( knx_keyring_ia_seqs )
274 | {
275 | struct knx_keyring_ia_seqs* ia_seq = knx_keyring_ia_seqs;
276 | knx_keyring_ia_seqs = ia_seq->next;
277 | wmem_free( wmem_epan_scope(), ia_seq );
278 | }
279 | }
280 |
281 | // Read IP address
282 | static void read_ip_addr( uint8_t result[ 4 ], const char* text )
283 | {
284 | ws_in4_addr value = 0;
285 | if( ws_inet_pton4( text, &value ) )
286 | memcpy( result, &value, 4 );
287 | else
288 | memset( result, 0, 4 );
289 | }
290 |
291 | // Read KNX group address
292 | static uint16_t read_ga( const char* text )
293 | {
294 | unsigned a[ 3 ];
295 | int n = sscanf( text, "%u/%u/%u", a, a + 1, a + 2 );
296 | return
297 | (n == 1) ? (uint16_t) a[ 0 ] :
298 | (n == 2) ? (uint16_t) ((a[ 0 ] << 11) | a[ 1 ]) :
299 | (n == 3) ? (uint16_t) ((a[ 0 ] << 11) | (a[ 1 ] << 8) | a[ 2 ]) :
300 | 0;
301 | }
302 |
303 | // Read KNX individual address
304 | static uint16_t read_ia( const char* text )
305 | {
306 | unsigned a[ 3 ];
307 | int n = sscanf( text, "%u.%u.%u", a, a + 1, a + 2 );
308 | return
309 | (n == 1) ? (uint16_t) a[ 0 ] :
310 | (n == 2) ? (uint16_t) ((a[ 0 ] << 8) | a[ 1 ]) :
311 | (n == 3) ? (uint16_t) ((a[ 0 ] << 12) | (a[ 1 ] << 8) | a[ 2 ]) :
312 | 0;
313 | }
314 |
315 | // Read 6-byte sequence number from decimal representation
316 | static uint64_t read_seq( const char* text )
317 | {
318 | uint64_t result;
319 | return ws_strtou64( text, NULL((void*)0), &result ) ? result : 0;
320 | }
321 |
322 | // Decrypt key
323 | static void decrypt_key( uint8_t key[] _U___attribute__((unused)), uint8_t password_hash[] _U___attribute__((unused)), uint8_t created_hash[] _U___attribute__((unused)) )
324 | {
325 | // TODO: decrypt as AES128-CBC(key, password_hash, created_hash)
326 | }
327 |
328 | // Decode and decrypt key
329 | static void decode_and_decrypt_key( uint8_t key[ BASE64_KNX_KEY_LENGTH24 + 1 ], const char* text, uint8_t password_hash[], uint8_t created_hash[] )
330 | {
331 | size_t out_len;
332 | snprintf( (char*) key, BASE64_KNX_KEY_LENGTH24 + 1, "%s", text );
333 | g_base64_decode_inplace( (char*) key, &out_len );
334 | decrypt_key( key, password_hash, created_hash );
335 | }
336 |
337 | // Add MCA <-> key association
338 | static void add_mca_key( const uint8_t mca[ IPA_SIZE4 ], const char* text, uint8_t password_hash[], uint8_t created_hash[], FILE* f2 )
339 | {
340 | int text_length = (int) strlen( text );
341 |
342 | if( text_length == BASE64_KNX_KEY_LENGTH24 )
343 | {
344 | uint8_t key[ BASE64_KNX_KEY_LENGTH24 + 1 ];
345 | struct knx_keyring_mca_keys** mca_keys_next;
346 | struct knx_keyring_mca_keys* mca_key;
347 |
348 | decode_and_decrypt_key( key, text, password_hash, created_hash );
349 |
350 | mca_keys_next = &knx_keyring_mca_keys;
351 |
352 | while( (mca_key = *mca_keys_next) != NULL((void*)0) )
353 | {
354 | if( memcmp( mca_key->mca, mca, IPA_SIZE4 ) == 0 )
355 | {
356 | if( memcmp( mca_key->key, key, KNX_KEY_LENGTH16 ) == 0 )
357 | {
358 | return;
359 | }
360 | }
361 |
362 | mca_keys_next = &mca_key->next;
363 | }
364 |
365 | if( f2 )
366 | {
367 | fprintf( f2, "MCA %u.%u.%u.%u key", mca[ 0 ], mca[ 1 ], mca[ 2 ], mca[ 3 ] );
368 | fprintf_hex( f2, key, KNX_KEY_LENGTH16 );
369 | }
370 |
371 | mca_key = wmem_new(wmem_epan_scope(), struct knx_keyring_mca_keys)((struct knx_keyring_mca_keys*)wmem_alloc((wmem_epan_scope()) , sizeof(struct knx_keyring_mca_keys)));
372 |
373 | if( mca_key )
374 | {
375 | mca_key->next = NULL((void*)0);
376 | memcpy( mca_key->mca, mca, IPA_SIZE4 );
377 | memcpy( mca_key->key, key, KNX_KEY_LENGTH16 );
378 |
379 | *mca_keys_next = mca_key;
380 | }
381 | }
382 | }
383 |
384 | // Add GA <-> key association
385 | static void add_ga_key( uint16_t ga, const char* text, uint8_t password_hash[], uint8_t created_hash[], FILE* f2 )
386 | {
387 | int text_length = (int) strlen( text );
388 |
389 | if( text_length == BASE64_KNX_KEY_LENGTH24 )
390 | {
391 | uint8_t key[ BASE64_KNX_KEY_LENGTH24 + 1 ];
392 | struct knx_keyring_ga_keys** ga_keys_next;
393 | struct knx_keyring_ga_keys* ga_key;
394 |
395 | decode_and_decrypt_key( key, text, password_hash, created_hash );
396 |
397 | ga_keys_next = &knx_keyring_ga_keys;
398 |
399 | while( (ga_key = *ga_keys_next) != NULL((void*)0) )
400 | {
401 | if( ga_key->ga == ga )
402 | {
403 | if( memcmp( ga_key->key, key, KNX_KEY_LENGTH16 ) == 0 )
404 | {
405 | return;
406 | }
407 | }
408 |
409 | ga_keys_next = &ga_key->next;
410 | }
411 |
412 | if( f2 )
413 | {
414 | fprintf( f2, "GA %d/%d/%d key", (ga >> 11) & 0x1F, (ga >> 8) & 0x7, ga & 0xFF );
415 | fprintf_hex( f2, key, KNX_KEY_LENGTH16 );
416 | }
417 |
418 | ga_key = wmem_new(wmem_epan_scope(), struct knx_keyring_ga_keys)((struct knx_keyring_ga_keys*)wmem_alloc((wmem_epan_scope()), sizeof(struct knx_keyring_ga_keys)));
419 |
420 | if( ga_key )
421 | {
422 | ga_key->next = NULL((void*)0);
423 | ga_key->ga = ga;
424 | memcpy( ga_key->key, key, KNX_KEY_LENGTH16 );
425 |
426 | *ga_keys_next = ga_key;
427 | }
428 | }
429 | }
430 |
431 | // Add GA <-> sender association
432 | static void add_ga_sender( uint16_t ga, const char* text, FILE* f2 )
433 | {
434 | uint16_t ia = read_ia( text );
435 | struct knx_keyring_ga_senders** ga_senders_next = &knx_keyring_ga_senders;
436 | struct knx_keyring_ga_senders* ga_sender;
437 |
438 | while( (ga_sender = *ga_senders_next) != NULL((void*)0) )
439 | {
440 | if( ga_sender->ga == ga )
441 | {
442 | if( ga_sender->ia == ia )
443 | {
444 | return;
445 | }
446 | }
447 |
448 | ga_senders_next = &ga_sender->next;
449 | }
450 |
451 | if( f2 )
452 | {
453 | fprintf( f2, "GA %d/%d/%d sender %d.%d.%d\n", (ga >> 11) & 0x1F, (ga >> 8) & 0x7, ga & 0xFF, (ia >> 12) & 0xF, (ia >> 8) & 0xF, ia & 0xFF );
454 | }
455 |
456 | ga_sender = wmem_new(wmem_epan_scope(), struct knx_keyring_ga_senders)((struct knx_keyring_ga_senders*)wmem_alloc((wmem_epan_scope( )), sizeof(struct knx_keyring_ga_senders)));
457 |
458 | if( ga_sender )
459 | {
460 | ga_sender->next = NULL((void*)0);
461 | ga_sender->ga = ga;
462 | ga_sender->ia = ia;
463 |
464 | *ga_senders_next = ga_sender;
465 | }
466 | }
467 |
468 | // Add IA <-> key association
469 | static void add_ia_key( uint16_t ia, const char* text, uint8_t password_hash[], uint8_t created_hash[], FILE* f2 )
470 | {
471 | int text_length = (int) strlen( text );
472 |
473 | if( text_length == BASE64_KNX_KEY_LENGTH24 )
474 | {
475 | uint8_t key[ BASE64_KNX_KEY_LENGTH24 + 1 ];
476 | struct knx_keyring_ia_keys** ia_keys_next;
477 | struct knx_keyring_ia_keys* ia_key;
478 |
479 | decode_and_decrypt_key( key, text, password_hash, created_hash );
480 |
481 | ia_keys_next = &knx_keyring_ia_keys;
482 |
483 | while( (ia_key = *ia_keys_next) != NULL((void*)0) )
484 | {
485 | if( ia_key->ia == ia )
486 | {
487 | if( memcmp( ia_key->key, key, KNX_KEY_LENGTH16 ) == 0 )
488 | {
489 | return;
490 | }
491 | }
492 |
493 | ia_keys_next = &ia_key->next;
494 | }
495 |
496 | if( f2 )
497 | {
498 | fprintf( f2, "IA %d.%d.%d key", (ia >> 12) & 0xF, (ia >> 8) & 0xF, ia & 0xFF );
499 | fprintf_hex( f2, key, KNX_KEY_LENGTH16 );
500 | }
501 |
502 | ia_key = wmem_new(wmem_epan_scope(), struct knx_keyring_ia_keys)((struct knx_keyring_ia_keys*)wmem_alloc((wmem_epan_scope()), sizeof(struct knx_keyring_ia_keys)));
503 |
504 | if( ia_key )
505 | {
506 | ia_key->next = NULL((void*)0);
507 | ia_key->ia = ia;
508 | memcpy( ia_key->key, key, KNX_KEY_LENGTH16 );
509 |
510 | *ia_keys_next = ia_key;
511 | }
512 | }
513 | }
514 |
515 | // Add IA <-> sequence number association
516 | static void add_ia_seq( uint16_t ia, const char* text, FILE* f2 )
517 | {
518 | uint64_t seq = read_seq( text );
519 |
520 | struct knx_keyring_ia_seqs** ia_seqs_next = &knx_keyring_ia_seqs;
521 | struct knx_keyring_ia_seqs* ia_seq;
522 |
523 | while( (ia_seq = *ia_seqs_next) != NULL((void*)0) )
524 | {
525 | if( ia_seq->ia == ia )
526 | {
527 | if( ia_seq->seq == seq )
528 | {
529 | return;
530 | }
531 | }
532 |
533 | ia_seqs_next = &ia_seq->next;
534 | }
535 |
536 | if( f2 )
537 | {
538 | fprintf( f2, "IA %u.%u.%u SeqNr %" PRIu64"l" "u" "\n", (ia >> 12) & 0xF, (ia >> 8) & 0xF, ia & 0xFF, seq );
539 | }
540 |
541 | ia_seq = wmem_new(wmem_epan_scope(), struct knx_keyring_ia_seqs)((struct knx_keyring_ia_seqs*)wmem_alloc((wmem_epan_scope()), sizeof(struct knx_keyring_ia_seqs)));
542 |
543 | if( ia_seq )
544 | {
545 | ia_seq->next = NULL((void*)0);
546 | ia_seq->ia = ia;
547 | ia_seq->seq = seq;
548 |
549 | *ia_seqs_next = ia_seq;
550 | }
551 | }
552 |
553 | // Calculate PBKDF2(HMAC-SHA256, password, "1.keyring.ets.knx.org", 65536, 128)
554 | static void make_password_hash( uint8_t password_hash[] _U___attribute__((unused)), const char* password _U___attribute__((unused)) )
555 | {
556 | // TODO: password_hash = PBKDF2(HMAC-SHA256, password, "1.keyring.ets.knx.org", 65536, 128)
557 | }
558 |
559 | // Calculate MSB128(SHA256(created))
560 | static void make_created_hash( uint8_t created_hash[] _U___attribute__((unused)), const char* created _U___attribute__((unused)) )
561 | {
562 | // TODO: created_hash = MSB128(SHA256(created))
563 | }
564 |
565 | static void read_knx_keyring_xml_backbone_element(xmlNodePtr backbone, uint8_t password_hash[], uint8_t created_hash[], FILE* f2)
566 | {
567 | bool_Bool address_valid = false0;
568 | uint8_t multicast_address[IPA_SIZE4] = { 0 };
569 |
570 | /* Parse out the attributes of the Backbone element */
571 | for (xmlAttrPtr attr = backbone->properties; attr; attr = attr->next)
572 | {
573 | if (xmlStrcmp(attr->name, (const xmlChar*)"MulticastAddress") == 0)
574 | {
575 | xmlChar* str_address = xmlNodeListGetString(backbone->doc, attr->children, 1);
576 | if (str_address != NULL((void*)0))
577 | {
578 | read_ip_addr(multicast_address, (const char*)str_address);
579 | address_valid = true1;
580 | xmlFree(str_address);
581 | }
582 | }
583 | else if (xmlStrcmp(attr->name, (const xmlChar*)"Key") == 0)
584 | {
585 | if (address_valid)
586 | {
587 | xmlChar* str_key = xmlNodeListGetString(backbone->doc, attr->children, 1);
588 | if (str_key != NULL((void*)0))
589 | {
590 | add_mca_key(multicast_address, (const char*)str_key, password_hash, created_hash, f2);
591 | xmlFree(str_key);
592 | }
593 | }
594 | }
595 | }
596 |
597 | }
598 |
599 | static void read_knx_keyring_xml_group_element(xmlNodePtr group, uint8_t password_hash[], uint8_t created_hash[], FILE* f2)
600 | {
601 | bool_Bool address_valid = false0;
602 | uint16_t addr = 0;
603 |
604 | /* Parse out the attributes of the Group element */
605 | for (xmlAttrPtr attr = group->properties; attr; attr = attr->next)
606 | {
607 | if (xmlStrcmp(attr->name, (const xmlChar*)"Address") == 0)
608 | {
609 | xmlChar* str_address = xmlNodeListGetString(group->doc, attr->children, 1);
610 | if (str_address != NULL((void*)0))
611 | {
612 | addr = read_ga((const char*)str_address);
613 | address_valid = true1;
614 | xmlFree(str_address);
615 | }
616 | }
617 | else if (xmlStrcmp(attr->name, (const xmlChar*)"Key") == 0)
618 | {
619 | if (address_valid)
620 | {
621 | xmlChar* str_key = xmlNodeListGetString(group->doc, attr->children, 1);
622 | add_ga_key(addr, (const char*)str_key, password_hash, created_hash, f2);
623 | xmlFree(str_key);
624 | }
625 | }
626 | else if (xmlStrcmp(attr->name, (const xmlChar*)"Senders") == 0)
627 | {
628 | if (address_valid)
629 | {
630 | xmlChar* str_senders = xmlNodeListGetString(group->doc, attr->children, 1);
631 | if (str_senders != NULL((void*)0))
632 | {
633 | // Add senders given by space separated list of KNX IAs
634 | static const char delim[] = " ,";
635 | const char* token = strtok((char*)str_senders, delim);
636 | while (token)
637 | {
638 | add_ga_sender(addr, token, f2);
639 | token = strtok(NULL((void*)0), delim);
640 | }
641 | xmlFree(str_senders);
642 | }
643 | }
644 | }
645 | }
646 |
647 | }
648 |
649 | static void read_knx_keyring_xml_device_element(xmlNodePtr device, uint8_t password_hash[], uint8_t created_hash[], FILE* f2)
650 | {
651 | bool_Bool address_valid = false0;
652 | uint16_t addr = 0;
653 |
654 | /* Parse out the attributes of the Device element */
655 | for (xmlAttrPtr attr = device->properties; attr; attr = attr->next)
656 | {
657 | if (xmlStrcmp(attr->name, (const xmlChar*)"IndividualAddress") == 0)
658 | {
659 | xmlChar* str_address = xmlNodeListGetString(device->doc, attr->children, 1);
660 | if (str_address != NULL((void*)0))
661 | {
662 | addr = read_ia((const char*)str_address);
663 | address_valid = true1;
664 | xmlFree(str_address);
665 | }
666 | }
667 | else if (xmlStrcmp(attr->name, (const xmlChar*)"ToolKey") == 0)
668 | {
669 | if (address_valid)
670 | {
671 | xmlChar* str_key = xmlNodeListGetString(device->doc, attr->children, 1);
672 | if (str_key != NULL((void*)0))
673 | {
674 | add_ia_key(addr, (const char*)str_key, password_hash, created_hash, f2);
675 | xmlFree(str_key);
676 | }
677 | }
678 | }
679 | else if (xmlStrcmp(attr->name, (const xmlChar*)"SequenceNumber") == 0)
680 | {
681 | if (address_valid)
682 | {
683 | xmlChar* str_seq = xmlNodeListGetString(device->doc, attr->children, 1);
684 | if (str_seq != NULL((void*)0))
685 | {
686 | add_ia_seq(addr, (const char*)str_seq, f2);
687 | xmlFree(str_seq);
688 | }
689 | }
690 | }
691 | }
692 | }
693 |
694 | // Read KNX security key info from keyring XML file.
695 | //
696 | // An example keyring XML file is
697 | // "test/keys/knx_keyring.xml".
698 | //
699 | // Corresponding test is
700 | // suite_decryption.case_decrypt_knxip.test_knxip_keyring_xml_import
701 | //
702 | // Resulting decoded and decrypted 16-byte keys with context info are optionally written to a "key info" text file.
703 | // This may be useful, as these keys are not directly available from the keyring XML file .
704 | void read_knx_keyring_xml_file(const char* key_file, const char* password, const char* key_info_file)
705 | {
706 | xmlDocPtr doc;
707 | xmlNodePtr root_element = NULL((void*)0);
708 | xmlNodePtr key_ring = NULL((void*)0);
709 | uint8_t password_hash[KNX_KEY_LENGTH16] = { 0 };
710 | uint8_t created_hash[KNX_KEY_LENGTH16] = {0};
711 |
712 | // Clear old keyring data
713 | clear_keyring_data();
714 |
715 | doc = xmlReadFile(key_file, NULL((void*)0), 0);
716 | if (doc == NULL((void*)0))
1 | Assuming 'doc' is not equal to NULL | →
2 | ← | Taking false branch | →
717 | return;
718 |
719 | root_element = xmlDocGetRootElement(doc);
720 | if (root_element == NULL((void*)0))
3 | ← | Assuming 'root_element' is not equal to NULL | →
4 | ← | Taking false branch | →
721 | {
722 | xmlFreeDoc(doc);
723 | return;
724 | }
725 |
726 | /* Find the Keyring element */
727 | if (xmlStrcmp(root_element->name, (const xmlChar*)"Keyring") == 0)
5 | ← | Assuming the condition is true | →
6 | ← | Taking true branch | →
728 | {
729 | key_ring = root_element;
730 | }
731 | else
732 | {
733 | for (xmlNodePtr cur = root_element->children; cur != NULL((void*)0); cur = cur->next)
734 | {
735 | if (cur->type == XML_ELEMENT_NODE && xmlStrcmp(cur->name, (const xmlChar*)"Keyring") == 0)
736 | {
737 | key_ring = cur;
738 | break;
739 | }
740 | }
741 | }
742 |
743 | if (key_ring
6.1 | 'key_ring' is not equal to NULL
== NULL((void*)0)) {
744 | xmlFreeDoc(doc);
745 | return;
746 | }
747 |
748 | // Optionally write extracted data to key info file
749 | FILE* f2 = (!key_info_file || !*key_info_file) ? NULL((void*)0) :
7 | ← | Assuming 'key_info_file' is non-null | →
8 | ← | Assuming the condition is false | →
750 | (strcmp( key_info_file, "-" ) == 0) ? stdoutstdout :
9 | ← | Assuming the condition is false | →
10 | ← | '?' condition is false | →
751 | ws_fopenfopen( key_info_file, "w" );
11 | ← | Stream opened here | →
12 | ← | Assuming that 'fopen' is successful | →
752 |
753 | make_password_hash(password_hash, password);
754 |
755 | /* Parse out the attributes of the Keyring element */
756 | for (xmlAttrPtr attr = key_ring->properties; attr; attr = attr->next)
13 | ← | Loop condition is true. Entering loop body | →
18 | ← | Loop condition is false. Execution continues on line 770 | →
757 | {
758 | if (xmlStrcmp(attr->name, (const xmlChar*)"Created") == 0)
14 | ← | Assuming the condition is true | →
15 | ← | Taking true branch | →
759 | {
760 | xmlChar* str_created = xmlNodeListGetString(key_ring->doc, attr->children, 1);
761 | if (str_created != NULL((void*)0))
16 | ← | Assuming 'str_created' is not equal to NULL | →
17 | ← | Taking true branch | →
762 | {
763 | make_created_hash(created_hash, (const char*)str_created);
764 | xmlFree(str_created);
765 | }
766 | }
767 | }
768 |
769 | /* Parse out subelements of Keyring element */
770 | for (xmlNodePtr cur = key_ring->children; cur != NULL((void*)0); cur = cur->next)
19 | ← | Assuming 'cur' is equal to NULL | →
771 | {
772 | if (cur->type == XML_ELEMENT_NODE && xmlStrcmp(cur->name, (const xmlChar*)"Backbone") == 0)
773 | {
774 | read_knx_keyring_xml_backbone_element(cur, password_hash, created_hash, f2);
775 | }
776 | else if (cur->type == XML_ELEMENT_NODE && xmlStrcmp(cur->name, (const xmlChar*)"Interface") == 0)
777 | {
778 | for (xmlNodePtr group = cur->children; group != NULL((void*)0); group = group->next)
779 | {
780 | if (group->type == XML_ELEMENT_NODE && xmlStrcmp(group->name, (const xmlChar*)"Group") == 0)
781 | {
782 | read_knx_keyring_xml_group_element(group, password_hash, created_hash, f2);
783 | }
784 | }
785 | }
786 | else if (cur->type == XML_ELEMENT_NODE && xmlStrcmp(cur->name, (const xmlChar*)"GroupAddresses") == 0)
787 | {
788 | for (xmlNodePtr group = cur->children; group != NULL((void*)0); group = group->next)
789 | {
790 | if (group->type == XML_ELEMENT_NODE && xmlStrcmp(group->name, (const xmlChar*)"Group") == 0)
791 | {
792 | read_knx_keyring_xml_group_element(group, password_hash, created_hash, f2);
793 | }
794 | }
795 | }
796 | else if (cur->type == XML_ELEMENT_NODE && xmlStrcmp(cur->name, (const xmlChar*)"Devices") == 0)
797 | {
798 | for (xmlNodePtr device = cur->children; device != NULL((void*)0); device = device->next)
799 | {
800 | if (device->type == XML_ELEMENT_NODE && xmlStrcmp(device->name, (const xmlChar*)"Device") == 0)
801 | {
802 | read_knx_keyring_xml_device_element(device, password_hash, created_hash, f2);
803 | }
804 | }
805 | }
806 | }
807 |
808 | if (f2
19.1 | 'f2' is non-null
&& f2 != stdoutstdout)
20 | ← | Assuming 'f2' is equal to 'stdout' | →
21 | ← | Taking false branch | →
809 | fclose(f2);
810 | xmlFreeDoc(doc);
22 | ← | Opened stream never closed. Potential resource leak
811 | }
812 |
813 | /*
814 | * Editor modelines - https://www.wireshark.org/tools/modelines.html
815 | *
816 | * Local variables:
817 | * c-basic-offset: 2
818 | * tab-width: 8
819 | * indent-tabs-mode: nil
820 | * End:
821 | *
822 | * vi: set shiftwidth=2 tabstop=8 expandtab:
823 | * :indentSize=2:tabSize=8:noTabs=true:
824 | */