1/* crypto/x509/x509_cmp.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to.  The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 *    notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 *    notice, this list of conditions and the following disclaimer in the
30 *    documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 *    must display the following acknowledgement:
33 *    "This product includes cryptographic software written by
34 *     Eric Young (eay@cryptsoft.com)"
35 *    The word 'cryptographic' can be left out if the rouines from the library
36 *    being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 *    the apps directory (application code) you must include an acknowledgement:
39 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed.  i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59#include <stdio.h>
60#include <ctype.h>
61#include "cryptlib.h"
62#include <openssl/asn1.h>
63#include <openssl/objects.h>
64#include <openssl/x509.h>
65#include <openssl/x509v3.h>
66
67int X509_issuer_and_serial_cmp(const X509 *a, const X509 *b)
68	{
69	int i;
70	X509_CINF *ai,*bi;
71
72	ai=a->cert_info;
73	bi=b->cert_info;
74	i=M_ASN1_INTEGER_cmp(ai->serialNumber,bi->serialNumber);
75	if (i) return(i);
76	return(X509_NAME_cmp(ai->issuer,bi->issuer));
77	}
78
79#ifndef OPENSSL_NO_MD5
80unsigned long X509_issuer_and_serial_hash(X509 *a)
81	{
82	unsigned long ret=0;
83	EVP_MD_CTX ctx;
84	unsigned char md[16];
85	char *f;
86
87	EVP_MD_CTX_init(&ctx);
88	f=X509_NAME_oneline(a->cert_info->issuer,NULL,0);
89	ret=strlen(f);
90	EVP_DigestInit_ex(&ctx, EVP_md5(), NULL);
91	EVP_DigestUpdate(&ctx,(unsigned char *)f,ret);
92	OPENSSL_free(f);
93	EVP_DigestUpdate(&ctx,(unsigned char *)a->cert_info->serialNumber->data,
94		(unsigned long)a->cert_info->serialNumber->length);
95	EVP_DigestFinal_ex(&ctx,&(md[0]),NULL);
96	ret=(	((unsigned long)md[0]     )|((unsigned long)md[1]<<8L)|
97		((unsigned long)md[2]<<16L)|((unsigned long)md[3]<<24L)
98		)&0xffffffffL;
99	EVP_MD_CTX_cleanup(&ctx);
100	return(ret);
101	}
102#endif
103
104int X509_issuer_name_cmp(const X509 *a, const X509 *b)
105	{
106	return(X509_NAME_cmp(a->cert_info->issuer,b->cert_info->issuer));
107	}
108
109int X509_subject_name_cmp(const X509 *a, const X509 *b)
110	{
111	return(X509_NAME_cmp(a->cert_info->subject,b->cert_info->subject));
112	}
113
114int X509_CRL_cmp(const X509_CRL *a, const X509_CRL *b)
115	{
116	return(X509_NAME_cmp(a->crl->issuer,b->crl->issuer));
117	}
118
119X509_NAME *X509_get_issuer_name(X509 *a)
120	{
121	return(a->cert_info->issuer);
122	}
123
124unsigned long X509_issuer_name_hash(X509 *x)
125	{
126	return(X509_NAME_hash(x->cert_info->issuer));
127	}
128
129X509_NAME *X509_get_subject_name(X509 *a)
130	{
131	return(a->cert_info->subject);
132	}
133
134ASN1_INTEGER *X509_get_serialNumber(X509 *a)
135	{
136	return(a->cert_info->serialNumber);
137	}
138
139unsigned long X509_subject_name_hash(X509 *x)
140	{
141	return(X509_NAME_hash(x->cert_info->subject));
142	}
143
144#ifndef OPENSSL_NO_SHA
145/* Compare two certificates: they must be identical for
146 * this to work. NB: Although "cmp" operations are generally
147 * prototyped to take "const" arguments (eg. for use in
148 * STACKs), the way X509 handling is - these operations may
149 * involve ensuring the hashes are up-to-date and ensuring
150 * certain cert information is cached. So this is the point
151 * where the "depth-first" constification tree has to halt
152 * with an evil cast.
153 */
154int X509_cmp(const X509 *a, const X509 *b)
155{
156	/* ensure hash is valid */
157	X509_check_purpose((X509 *)a, -1, 0);
158	X509_check_purpose((X509 *)b, -1, 0);
159
160	return memcmp(a->sha1_hash, b->sha1_hash, SHA_DIGEST_LENGTH);
161}
162#endif
163
164
165/* Case insensitive string comparision */
166static int nocase_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
167{
168	int i;
169
170	if (a->length != b->length)
171		return (a->length - b->length);
172
173	for (i=0; i<a->length; i++)
174	{
175		int ca, cb;
176
177		ca = tolower(a->data[i]);
178		cb = tolower(b->data[i]);
179
180		if (ca != cb)
181			return(ca-cb);
182	}
183	return 0;
184}
185
186/* Case insensitive string comparision with space normalization
187 * Space normalization - ignore leading, trailing spaces,
188 *       multiple spaces between characters are replaced by single space
189 */
190static int nocase_spacenorm_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
191{
192	unsigned char *pa = NULL, *pb = NULL;
193	int la, lb;
194
195	la = a->length;
196	lb = b->length;
197	pa = a->data;
198	pb = b->data;
199
200	/* skip leading spaces */
201	while (la > 0 && isspace(*pa))
202	{
203		la--;
204		pa++;
205	}
206	while (lb > 0 && isspace(*pb))
207	{
208		lb--;
209		pb++;
210	}
211
212	/* skip trailing spaces */
213	while (la > 0 && isspace(pa[la-1]))
214		la--;
215	while (lb > 0 && isspace(pb[lb-1]))
216		lb--;
217
218	/* compare strings with space normalization */
219	while (la > 0 && lb > 0)
220	{
221		int ca, cb;
222
223		/* compare character */
224		ca = tolower(*pa);
225		cb = tolower(*pb);
226		if (ca != cb)
227			return (ca - cb);
228
229		pa++; pb++;
230		la--; lb--;
231
232		if (la <= 0 || lb <= 0)
233			break;
234
235		/* is white space next character ? */
236		if (isspace(*pa) && isspace(*pb))
237		{
238			/* skip remaining white spaces */
239			while (la > 0 && isspace(*pa))
240			{
241				la--;
242				pa++;
243			}
244			while (lb > 0 && isspace(*pb))
245			{
246				lb--;
247				pb++;
248			}
249		}
250	}
251	if (la > 0 || lb > 0)
252		return la - lb;
253
254	return 0;
255}
256
257static int asn1_string_memcmp(ASN1_STRING *a, ASN1_STRING *b)
258	{
259	int j;
260	j = a->length - b->length;
261	if (j)
262		return j;
263	return memcmp(a->data, b->data, a->length);
264	}
265
266#define STR_TYPE_CMP (B_ASN1_PRINTABLESTRING|B_ASN1_T61STRING|B_ASN1_UTF8STRING)
267
268int X509_NAME_cmp(const X509_NAME *a, const X509_NAME *b)
269	{
270	int i,j;
271	X509_NAME_ENTRY *na,*nb;
272
273	unsigned long nabit, nbbit;
274
275	j = sk_X509_NAME_ENTRY_num(a->entries)
276		  - sk_X509_NAME_ENTRY_num(b->entries);
277	if (j)
278		return j;
279	for (i=sk_X509_NAME_ENTRY_num(a->entries)-1; i>=0; i--)
280		{
281		na=sk_X509_NAME_ENTRY_value(a->entries,i);
282		nb=sk_X509_NAME_ENTRY_value(b->entries,i);
283		j=na->value->type-nb->value->type;
284		if (j)
285			{
286			nabit = ASN1_tag2bit(na->value->type);
287			nbbit = ASN1_tag2bit(nb->value->type);
288			if (!(nabit & STR_TYPE_CMP) ||
289				!(nbbit & STR_TYPE_CMP))
290				return j;
291			if (!asn1_string_memcmp(na->value, nb->value))
292				j = 0;
293			}
294		else if (na->value->type == V_ASN1_PRINTABLESTRING)
295			j=nocase_spacenorm_cmp(na->value, nb->value);
296		else if (na->value->type == V_ASN1_IA5STRING
297			&& OBJ_obj2nid(na->object) == NID_pkcs9_emailAddress)
298			j=nocase_cmp(na->value, nb->value);
299		else
300			j = asn1_string_memcmp(na->value, nb->value);
301		if (j) return(j);
302		j=na->set-nb->set;
303		if (j) return(j);
304		}
305
306	/* We will check the object types after checking the values
307	 * since the values will more often be different than the object
308	 * types. */
309	for (i=sk_X509_NAME_ENTRY_num(a->entries)-1; i>=0; i--)
310		{
311		na=sk_X509_NAME_ENTRY_value(a->entries,i);
312		nb=sk_X509_NAME_ENTRY_value(b->entries,i);
313		j=OBJ_cmp(na->object,nb->object);
314		if (j) return(j);
315		}
316	return(0);
317	}
318
319#ifndef OPENSSL_NO_MD5
320/* I now DER encode the name and hash it.  Since I cache the DER encoding,
321 * this is reasonably efficient. */
322unsigned long X509_NAME_hash(X509_NAME *x)
323	{
324	unsigned long ret=0;
325	unsigned char md[16];
326	EVP_MD_CTX md_ctx;
327
328	/* Make sure X509_NAME structure contains valid cached encoding */
329	i2d_X509_NAME(x,NULL);
330	EVP_MD_CTX_init(&md_ctx);
331	EVP_MD_CTX_set_flags(&md_ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
332	EVP_DigestInit_ex(&md_ctx, EVP_md5(), NULL);
333	EVP_DigestUpdate(&md_ctx, x->bytes->data, x->bytes->length);
334	EVP_DigestFinal_ex(&md_ctx,md,NULL);
335	EVP_MD_CTX_cleanup(&md_ctx);
336
337	ret=(	((unsigned long)md[0]     )|((unsigned long)md[1]<<8L)|
338		((unsigned long)md[2]<<16L)|((unsigned long)md[3]<<24L)
339		)&0xffffffffL;
340	return(ret);
341	}
342#endif
343
344/* Search a stack of X509 for a match */
345X509 *X509_find_by_issuer_and_serial(STACK_OF(X509) *sk, X509_NAME *name,
346		ASN1_INTEGER *serial)
347	{
348	int i;
349	X509_CINF cinf;
350	X509 x,*x509=NULL;
351
352	if(!sk) return NULL;
353
354	x.cert_info= &cinf;
355	cinf.serialNumber=serial;
356	cinf.issuer=name;
357
358	for (i=0; i<sk_X509_num(sk); i++)
359		{
360		x509=sk_X509_value(sk,i);
361		if (X509_issuer_and_serial_cmp(x509,&x) == 0)
362			return(x509);
363		}
364	return(NULL);
365	}
366
367X509 *X509_find_by_subject(STACK_OF(X509) *sk, X509_NAME *name)
368	{
369	X509 *x509;
370	int i;
371
372	for (i=0; i<sk_X509_num(sk); i++)
373		{
374		x509=sk_X509_value(sk,i);
375		if (X509_NAME_cmp(X509_get_subject_name(x509),name) == 0)
376			return(x509);
377		}
378	return(NULL);
379	}
380
381EVP_PKEY *X509_get_pubkey(X509 *x)
382	{
383	if ((x == NULL) || (x->cert_info == NULL))
384		return(NULL);
385	return(X509_PUBKEY_get(x->cert_info->key));
386	}
387
388ASN1_BIT_STRING *X509_get0_pubkey_bitstr(const X509 *x)
389	{
390	if(!x) return NULL;
391	return x->cert_info->key->public_key;
392	}
393
394int X509_check_private_key(X509 *x, EVP_PKEY *k)
395	{
396	EVP_PKEY *xk=NULL;
397	int ok=0;
398
399	xk=X509_get_pubkey(x);
400	switch (EVP_PKEY_cmp(xk, k))
401		{
402	case 1:
403		ok=1;
404		break;
405	case 0:
406		X509err(X509_F_X509_CHECK_PRIVATE_KEY,X509_R_KEY_VALUES_MISMATCH);
407		break;
408	case -1:
409		X509err(X509_F_X509_CHECK_PRIVATE_KEY,X509_R_KEY_TYPE_MISMATCH);
410		break;
411	case -2:
412#ifndef OPENSSL_NO_EC
413		if (k->type == EVP_PKEY_EC)
414			{
415			X509err(X509_F_X509_CHECK_PRIVATE_KEY, ERR_R_EC_LIB);
416			break;
417			}
418#endif
419#ifndef OPENSSL_NO_DH
420		if (k->type == EVP_PKEY_DH)
421			{
422			/* No idea */
423			X509err(X509_F_X509_CHECK_PRIVATE_KEY,X509_R_CANT_CHECK_DH_KEY);
424			break;
425			}
426#endif
427	        X509err(X509_F_X509_CHECK_PRIVATE_KEY,X509_R_UNKNOWN_KEY_TYPE);
428		}
429
430	EVP_PKEY_free(xk);
431	return(ok);
432	}
433