2 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 #include "crypto/ctype.h"
12 #include "internal/cryptlib.h"
13 #include <openssl/asn1t.h>
14 #include <openssl/x509.h>
15 #include "crypto/x509.h"
16 #include "crypto/asn1.h"
17 #include "x509_local.h"
20 * Maximum length of X509_NAME: much larger than anything we should
21 * ever see in practice.
24 #define X509_NAME_MAX (1024 * 1024)
26 static int x509_name_ex_d2i(ASN1_VALUE **val,
27 const unsigned char **in, long len,
29 int tag, int aclass, char opt, ASN1_TLC *ctx);
31 static int x509_name_ex_i2d(const ASN1_VALUE **val, unsigned char **out,
32 const ASN1_ITEM *it, int tag, int aclass);
33 static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it);
34 static void x509_name_ex_free(ASN1_VALUE **val, const ASN1_ITEM *it);
36 static int x509_name_encode(X509_NAME *a);
37 static int x509_name_canon(X509_NAME *a);
38 static int asn1_string_canon(ASN1_STRING *out, const ASN1_STRING *in);
39 static int i2d_name_canon(const STACK_OF(STACK_OF_X509_NAME_ENTRY) * intname,
42 static int x509_name_ex_print(BIO *out, const ASN1_VALUE **pval,
44 const char *fname, const ASN1_PCTX *pctx);
46 ASN1_SEQUENCE(X509_NAME_ENTRY) = {
47 ASN1_SIMPLE(X509_NAME_ENTRY, object, ASN1_OBJECT),
48 ASN1_SIMPLE(X509_NAME_ENTRY, value, ASN1_PRINTABLE)
49 } ASN1_SEQUENCE_END(X509_NAME_ENTRY)
51 IMPLEMENT_ASN1_FUNCTIONS(X509_NAME_ENTRY)
52 IMPLEMENT_ASN1_DUP_FUNCTION(X509_NAME_ENTRY)
55 * For the "Name" type we need a SEQUENCE OF { SET OF X509_NAME_ENTRY } so
56 * declare two template wrappers for this
59 ASN1_ITEM_TEMPLATE(X509_NAME_ENTRIES) =
60 ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SET_OF, 0, RDNS, X509_NAME_ENTRY)
61 static_ASN1_ITEM_TEMPLATE_END(X509_NAME_ENTRIES)
63 ASN1_ITEM_TEMPLATE(X509_NAME_INTERNAL) =
64 ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, Name, X509_NAME_ENTRIES)
65 static_ASN1_ITEM_TEMPLATE_END(X509_NAME_INTERNAL)
68 * Normally that's where it would end: we'd have two nested STACK structures
69 * representing the ASN1. Unfortunately X509_NAME uses a completely different
70 * form and caches encodings so we have to process the internal form and
71 * convert to the external form.
74 static const ASN1_EXTERN_FUNCS x509_name_ff = {
78 0, /* Default clear behaviour is OK */
84 IMPLEMENT_EXTERN_ASN1(X509_NAME, V_ASN1_SEQUENCE, x509_name_ff)
86 IMPLEMENT_ASN1_FUNCTIONS(X509_NAME)
88 IMPLEMENT_ASN1_DUP_FUNCTION(X509_NAME)
90 static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it)
92 X509_NAME *ret = OPENSSL_zalloc(sizeof(*ret));
96 if ((ret->entries = sk_X509_NAME_ENTRY_new_null()) == NULL)
98 if ((ret->bytes = BUF_MEM_new()) == NULL)
101 *val = (ASN1_VALUE *)ret;
105 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
107 sk_X509_NAME_ENTRY_free(ret->entries);
113 static void x509_name_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
117 if (pval == NULL || *pval == NULL)
119 a = (X509_NAME *)*pval;
121 BUF_MEM_free(a->bytes);
122 sk_X509_NAME_ENTRY_pop_free(a->entries, X509_NAME_ENTRY_free);
123 OPENSSL_free(a->canon_enc);
128 static void local_sk_X509_NAME_ENTRY_free(STACK_OF(X509_NAME_ENTRY) *ne)
130 sk_X509_NAME_ENTRY_free(ne);
133 static void local_sk_X509_NAME_ENTRY_pop_free(STACK_OF(X509_NAME_ENTRY) *ne)
135 sk_X509_NAME_ENTRY_pop_free(ne, X509_NAME_ENTRY_free);
138 static int x509_name_ex_d2i(ASN1_VALUE **val,
139 const unsigned char **in, long len,
140 const ASN1_ITEM *it, int tag, int aclass,
141 char opt, ASN1_TLC *ctx)
143 const unsigned char *p = *in, *q;
145 STACK_OF(STACK_OF_X509_NAME_ENTRY) *s;
157 STACK_OF(X509_NAME_ENTRY) *entries;
158 X509_NAME_ENTRY *entry;
160 if (len > X509_NAME_MAX)
164 /* Get internal representation of Name */
165 ret = ASN1_item_ex_d2i(&intname.a,
166 &p, len, ASN1_ITEM_rptr(X509_NAME_INTERNAL),
167 tag, aclass, opt, ctx);
173 x509_name_ex_free(val, NULL);
174 if (!x509_name_ex_new(&nm.a, NULL))
176 /* We've decoded it: now cache encoding */
177 if (!BUF_MEM_grow(nm.x->bytes, p - q))
179 memcpy(nm.x->bytes->data, q, p - q);
181 /* Convert internal representation to X509_NAME structure */
182 for (i = 0; i < sk_STACK_OF_X509_NAME_ENTRY_num(intname.s); i++) {
183 entries = sk_STACK_OF_X509_NAME_ENTRY_value(intname.s, i);
184 for (j = 0; j < sk_X509_NAME_ENTRY_num(entries); j++) {
185 entry = sk_X509_NAME_ENTRY_value(entries, j);
187 if (!sk_X509_NAME_ENTRY_push(nm.x->entries, entry))
189 (void)sk_X509_NAME_ENTRY_set(entries, j, NULL);
192 ret = x509_name_canon(nm.x);
195 sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
196 local_sk_X509_NAME_ENTRY_free);
204 X509_NAME_free(nm.x);
205 sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
206 local_sk_X509_NAME_ENTRY_pop_free);
207 ERR_raise(ERR_LIB_ASN1, ERR_R_NESTED_ASN1_ERROR);
211 static int x509_name_ex_i2d(const ASN1_VALUE **val, unsigned char **out,
212 const ASN1_ITEM *it, int tag, int aclass)
215 X509_NAME *a = (X509_NAME *)*val;
218 ret = x509_name_encode(a);
221 ret = x509_name_canon(a);
225 ret = a->bytes->length;
227 memcpy(*out, a->bytes->data, ret);
233 static int x509_name_encode(X509_NAME *a)
236 STACK_OF(STACK_OF_X509_NAME_ENTRY) *s;
243 STACK_OF(X509_NAME_ENTRY) *entries = NULL;
244 X509_NAME_ENTRY *entry;
247 intname.s = sk_STACK_OF_X509_NAME_ENTRY_new_null();
250 for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
251 entry = sk_X509_NAME_ENTRY_value(a->entries, i);
252 if (entry->set != set) {
253 entries = sk_X509_NAME_ENTRY_new_null();
256 if (!sk_STACK_OF_X509_NAME_ENTRY_push(intname.s, entries)) {
257 sk_X509_NAME_ENTRY_free(entries);
262 if (!sk_X509_NAME_ENTRY_push(entries, entry))
265 len = ASN1_item_ex_i2d(&intname.a, NULL,
266 ASN1_ITEM_rptr(X509_NAME_INTERNAL), -1, -1);
267 if (!BUF_MEM_grow(a->bytes, len))
269 p = (unsigned char *)a->bytes->data;
270 ASN1_item_ex_i2d(&intname.a,
271 &p, ASN1_ITEM_rptr(X509_NAME_INTERNAL), -1, -1);
272 sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
273 local_sk_X509_NAME_ENTRY_free);
277 sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname.s,
278 local_sk_X509_NAME_ENTRY_free);
279 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
283 static int x509_name_ex_print(BIO *out, const ASN1_VALUE **pval,
285 const char *fname, const ASN1_PCTX *pctx)
287 if (X509_NAME_print_ex(out, (const X509_NAME *)*pval,
288 indent, pctx->nm_flags) <= 0)
294 * This function generates the canonical encoding of the Name structure. In
295 * it all strings are converted to UTF8, leading, trailing and multiple
296 * spaces collapsed, converted to lower case and the leading SEQUENCE header
297 * removed. In future we could also normalize the UTF8 too. By doing this
298 * comparison of Name structures can be rapidly performed by just using
299 * memcmp() of the canonical encoding. By omitting the leading SEQUENCE name
300 * constraints of type dirName can also be checked with a simple memcmp().
301 * NOTE: For empty X509_NAME (NULL-DN), canon_enclen == 0 && canon_enc == NULL
304 static int x509_name_canon(X509_NAME *a)
307 STACK_OF(STACK_OF_X509_NAME_ENTRY) *intname;
308 STACK_OF(X509_NAME_ENTRY) *entries = NULL;
309 X509_NAME_ENTRY *entry, *tmpentry = NULL;
310 int i, set = -1, ret = 0, len;
312 OPENSSL_free(a->canon_enc);
314 /* Special case: empty X509_NAME => null encoding */
315 if (sk_X509_NAME_ENTRY_num(a->entries) == 0) {
319 intname = sk_STACK_OF_X509_NAME_ENTRY_new_null();
320 if (intname == NULL) {
321 ERR_raise(ERR_LIB_X509, ERR_R_MALLOC_FAILURE);
324 for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
325 entry = sk_X509_NAME_ENTRY_value(a->entries, i);
326 if (entry->set != set) {
327 entries = sk_X509_NAME_ENTRY_new_null();
330 if (!sk_STACK_OF_X509_NAME_ENTRY_push(intname, entries)) {
331 sk_X509_NAME_ENTRY_free(entries);
332 ERR_raise(ERR_LIB_X509, ERR_R_MALLOC_FAILURE);
337 tmpentry = X509_NAME_ENTRY_new();
338 if (tmpentry == NULL) {
339 ERR_raise(ERR_LIB_X509, ERR_R_MALLOC_FAILURE);
342 tmpentry->object = OBJ_dup(entry->object);
343 if (tmpentry->object == NULL) {
344 ERR_raise(ERR_LIB_X509, ERR_R_MALLOC_FAILURE);
347 if (!asn1_string_canon(tmpentry->value, entry->value))
349 if (!sk_X509_NAME_ENTRY_push(entries, tmpentry)) {
350 ERR_raise(ERR_LIB_X509, ERR_R_MALLOC_FAILURE);
356 /* Finally generate encoding */
357 len = i2d_name_canon(intname, NULL);
360 a->canon_enclen = len;
362 p = OPENSSL_malloc(a->canon_enclen);
364 ERR_raise(ERR_LIB_X509, ERR_R_MALLOC_FAILURE);
370 i2d_name_canon(intname, &p);
375 X509_NAME_ENTRY_free(tmpentry);
376 sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname,
377 local_sk_X509_NAME_ENTRY_pop_free);
381 /* Bitmap of all the types of string that will be canonicalized. */
383 #define ASN1_MASK_CANON \
384 (B_ASN1_UTF8STRING | B_ASN1_BMPSTRING | B_ASN1_UNIVERSALSTRING \
385 | B_ASN1_PRINTABLESTRING | B_ASN1_T61STRING | B_ASN1_IA5STRING \
386 | B_ASN1_VISIBLESTRING)
388 static int asn1_string_canon(ASN1_STRING *out, const ASN1_STRING *in)
390 unsigned char *to, *from;
393 /* If type not in bitmask just copy string across */
394 if (!(ASN1_tag2bit(in->type) & ASN1_MASK_CANON)) {
395 if (!ASN1_STRING_copy(out, in))
400 out->type = V_ASN1_UTF8STRING;
401 out->length = ASN1_STRING_to_UTF8(&out->data, in);
402 if (out->length == -1)
411 * Convert string in place to canonical form. Ultimately we may need to
412 * handle a wider range of characters but for now ignore anything with
413 * MSB set and rely on the ossl_isspace() to fail on bad characters without
414 * needing isascii or range checks as well.
417 /* Ignore leading spaces */
418 while (len > 0 && ossl_isspace(*from)) {
425 /* Ignore trailing spaces */
426 while (len > 0 && ossl_isspace(to[-1])) {
435 /* If not ASCII set just copy across */
436 if (!ossl_isascii(*from)) {
440 /* Collapse multiple spaces */
441 else if (ossl_isspace(*from)) {
442 /* Copy one space across */
445 * Ignore subsequent spaces. Note: don't need to check len here
446 * because we know the last character is a non-space so we can't
453 while (ossl_isspace(*from));
455 *to++ = ossl_tolower(*from);
461 out->length = to - out->data;
467 static int i2d_name_canon(const STACK_OF(STACK_OF_X509_NAME_ENTRY) * _intname,
472 STACK_OF(ASN1_VALUE) *intname = (STACK_OF(ASN1_VALUE) *)_intname;
475 for (i = 0; i < sk_ASN1_VALUE_num(intname); i++) {
476 v = sk_ASN1_VALUE_value(intname, i);
477 ltmp = ASN1_item_ex_i2d(&v, in,
478 ASN1_ITEM_rptr(X509_NAME_ENTRIES), -1, -1);
486 int X509_NAME_set(X509_NAME **xn, const X509_NAME *name)
488 X509_NAME *name_copy;
492 if ((name_copy = X509_NAME_dup(name)) == NULL)
499 int X509_NAME_print(BIO *bp, const X509_NAME *name, int obase)
506 b = X509_NAME_oneline(name, NULL, 0);
513 s = b + 1; /* skip the first slash */
518 (ossl_isupper(s[1]) && ((s[2] == '=') ||
519 (ossl_isupper(s[2]) && (s[3] == '='))
523 if (BIO_write(bp, c, i) != i)
525 c = s + 1; /* skip following slash */
527 if (BIO_write(bp, ", ", 2) != 2)
541 ERR_raise(ERR_LIB_X509, ERR_R_BUF_LIB);
546 int X509_NAME_get0_der(const X509_NAME *nm, const unsigned char **pder,
549 /* Make sure encoding is valid */
550 if (i2d_X509_NAME(nm, NULL) <= 0)
553 *pder = (unsigned char *)nm->bytes->data;
555 *pderlen = nm->bytes->length;