/src/openssl/crypto/x509/v3_akid.c
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1 | | /* |
2 | | * Copyright 1999-2022 The OpenSSL Project Authors. All Rights Reserved. |
3 | | * |
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 |
8 | | */ |
9 | | |
10 | | #include <stdio.h> |
11 | | #include "internal/cryptlib.h" |
12 | | #include <openssl/conf.h> |
13 | | #include <openssl/asn1.h> |
14 | | #include <openssl/asn1t.h> |
15 | | #include <openssl/x509v3.h> |
16 | | #include "crypto/x509.h" |
17 | | #include "ext_dat.h" |
18 | | |
19 | | static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method, |
20 | | AUTHORITY_KEYID *akeyid, |
21 | | STACK_OF(CONF_VALUE) |
22 | | *extlist); |
23 | | static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method, |
24 | | X509V3_CTX *ctx, |
25 | | STACK_OF(CONF_VALUE) *values); |
26 | | |
27 | | const X509V3_EXT_METHOD ossl_v3_akey_id = { |
28 | | NID_authority_key_identifier, |
29 | | X509V3_EXT_MULTILINE, ASN1_ITEM_ref(AUTHORITY_KEYID), |
30 | | 0, 0, 0, 0, |
31 | | 0, 0, |
32 | | (X509V3_EXT_I2V) i2v_AUTHORITY_KEYID, |
33 | | (X509V3_EXT_V2I)v2i_AUTHORITY_KEYID, |
34 | | 0, 0, |
35 | | NULL |
36 | | }; |
37 | | |
38 | | static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method, |
39 | | AUTHORITY_KEYID *akeyid, |
40 | | STACK_OF(CONF_VALUE) |
41 | | *extlist) |
42 | 0 | { |
43 | 0 | char *tmp = NULL; |
44 | 0 | STACK_OF(CONF_VALUE) *origextlist = extlist, *tmpextlist; |
45 | |
|
46 | 0 | if (akeyid->keyid) { |
47 | 0 | tmp = i2s_ASN1_OCTET_STRING(NULL, akeyid->keyid); |
48 | 0 | if (tmp == NULL) { |
49 | 0 | ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB); |
50 | 0 | return NULL; |
51 | 0 | } |
52 | 0 | if (!X509V3_add_value((akeyid->issuer || akeyid->serial) ? "keyid" : NULL, |
53 | 0 | tmp, &extlist)) { |
54 | 0 | OPENSSL_free(tmp); |
55 | 0 | ERR_raise(ERR_LIB_X509V3, ERR_R_X509_LIB); |
56 | 0 | goto err; |
57 | 0 | } |
58 | 0 | OPENSSL_free(tmp); |
59 | 0 | } |
60 | 0 | if (akeyid->issuer) { |
61 | 0 | tmpextlist = i2v_GENERAL_NAMES(NULL, akeyid->issuer, extlist); |
62 | 0 | if (tmpextlist == NULL) { |
63 | 0 | ERR_raise(ERR_LIB_X509V3, ERR_R_X509_LIB); |
64 | 0 | goto err; |
65 | 0 | } |
66 | 0 | extlist = tmpextlist; |
67 | 0 | } |
68 | 0 | if (akeyid->serial) { |
69 | 0 | tmp = i2s_ASN1_OCTET_STRING(NULL, akeyid->serial); |
70 | 0 | if (tmp == NULL) { |
71 | 0 | ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB); |
72 | 0 | goto err; |
73 | 0 | } |
74 | 0 | if (!X509V3_add_value("serial", tmp, &extlist)) { |
75 | 0 | OPENSSL_free(tmp); |
76 | 0 | goto err; |
77 | 0 | } |
78 | 0 | OPENSSL_free(tmp); |
79 | 0 | } |
80 | 0 | return extlist; |
81 | 0 | err: |
82 | 0 | if (origextlist == NULL) |
83 | 0 | sk_CONF_VALUE_pop_free(extlist, X509V3_conf_free); |
84 | 0 | return NULL; |
85 | 0 | } |
86 | | |
87 | | /*- |
88 | | * Three explicit tags may be given, where 'keyid' and 'issuer' may be combined: |
89 | | * 'none': do not add any authority key identifier. |
90 | | * 'keyid': use the issuer's subject keyid; the option 'always' means its is |
91 | | * an error if the issuer certificate doesn't have a subject key id. |
92 | | * 'issuer': use the issuer's cert issuer and serial number. The default is |
93 | | * to only use this if 'keyid' is not present. With the option 'always' |
94 | | * this is always included. |
95 | | */ |
96 | | static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method, |
97 | | X509V3_CTX *ctx, |
98 | | STACK_OF(CONF_VALUE) *values) |
99 | 0 | { |
100 | 0 | char keyid = 0, issuer = 0; |
101 | 0 | int i, n = sk_CONF_VALUE_num(values); |
102 | 0 | CONF_VALUE *cnf; |
103 | 0 | ASN1_OCTET_STRING *ikeyid = NULL; |
104 | 0 | X509_NAME *isname = NULL; |
105 | 0 | GENERAL_NAMES *gens = NULL; |
106 | 0 | GENERAL_NAME *gen = NULL; |
107 | 0 | ASN1_INTEGER *serial = NULL; |
108 | 0 | X509_EXTENSION *ext; |
109 | 0 | X509 *issuer_cert; |
110 | 0 | int same_issuer, ss; |
111 | 0 | AUTHORITY_KEYID *akeyid = AUTHORITY_KEYID_new(); |
112 | |
|
113 | 0 | if (akeyid == NULL) |
114 | 0 | goto err; |
115 | | |
116 | 0 | if (n == 1 && strcmp(sk_CONF_VALUE_value(values, 0)->name, "none") == 0) { |
117 | 0 | return akeyid; |
118 | 0 | } |
119 | | |
120 | 0 | for (i = 0; i < n; i++) { |
121 | 0 | cnf = sk_CONF_VALUE_value(values, i); |
122 | 0 | if (cnf->value != NULL && strcmp(cnf->value, "always") != 0) { |
123 | 0 | ERR_raise_data(ERR_LIB_X509V3, X509V3_R_UNKNOWN_OPTION, |
124 | 0 | "name=%s option=%s", cnf->name, cnf->value); |
125 | 0 | goto err; |
126 | 0 | } |
127 | 0 | if (strcmp(cnf->name, "keyid") == 0 && keyid == 0) { |
128 | 0 | keyid = 1; |
129 | 0 | if (cnf->value != NULL) |
130 | 0 | keyid = 2; |
131 | 0 | } else if (strcmp(cnf->name, "issuer") == 0 && issuer == 0) { |
132 | 0 | issuer = 1; |
133 | 0 | if (cnf->value != NULL) |
134 | 0 | issuer = 2; |
135 | 0 | } else if (strcmp(cnf->name, "none") == 0 |
136 | 0 | || strcmp(cnf->name, "keyid") == 0 |
137 | 0 | || strcmp(cnf->name, "issuer") == 0) { |
138 | 0 | ERR_raise_data(ERR_LIB_X509V3, X509V3_R_BAD_VALUE, |
139 | 0 | "name=%s", cnf->name); |
140 | 0 | goto err; |
141 | 0 | } else { |
142 | 0 | ERR_raise_data(ERR_LIB_X509V3, X509V3_R_UNKNOWN_VALUE, |
143 | 0 | "name=%s", cnf->name); |
144 | 0 | goto err; |
145 | 0 | } |
146 | 0 | } |
147 | | |
148 | 0 | if (ctx != NULL && (ctx->flags & X509V3_CTX_TEST) != 0) |
149 | 0 | return akeyid; |
150 | | |
151 | 0 | if (ctx == NULL) { |
152 | 0 | ERR_raise(ERR_LIB_X509V3, ERR_R_PASSED_NULL_PARAMETER); |
153 | 0 | goto err; |
154 | 0 | } |
155 | 0 | if ((issuer_cert = ctx->issuer_cert) == NULL) { |
156 | 0 | ERR_raise(ERR_LIB_X509V3, X509V3_R_NO_ISSUER_CERTIFICATE); |
157 | 0 | goto err; |
158 | 0 | } |
159 | 0 | same_issuer = ctx->subject_cert == ctx->issuer_cert; |
160 | 0 | ERR_set_mark(); |
161 | 0 | if (ctx->issuer_pkey != NULL) |
162 | 0 | ss = X509_check_private_key(ctx->subject_cert, ctx->issuer_pkey); |
163 | 0 | else |
164 | 0 | ss = same_issuer; |
165 | 0 | ERR_pop_to_mark(); |
166 | | |
167 | | /* unless forced with "always", AKID is suppressed for self-signed certs */ |
168 | 0 | if (keyid == 2 || (keyid == 1 && !ss)) { |
169 | | /* |
170 | | * prefer any pre-existing subject key identifier of the issuer cert |
171 | | * except issuer cert is same as subject cert and is not self-signed |
172 | | */ |
173 | 0 | i = X509_get_ext_by_NID(issuer_cert, NID_subject_key_identifier, -1); |
174 | 0 | if (i >= 0 && (ext = X509_get_ext(issuer_cert, i)) != NULL |
175 | 0 | && !(same_issuer && !ss)) { |
176 | 0 | ikeyid = X509V3_EXT_d2i(ext); |
177 | 0 | if (ASN1_STRING_length(ikeyid) == 0) /* indicating "none" */ { |
178 | 0 | ASN1_OCTET_STRING_free(ikeyid); |
179 | 0 | ikeyid = NULL; |
180 | 0 | } |
181 | 0 | } |
182 | 0 | if (ikeyid == NULL && same_issuer && ctx->issuer_pkey != NULL) { |
183 | | /* generate fallback AKID, emulating s2i_skey_id(..., "hash") */ |
184 | 0 | X509_PUBKEY *pubkey = NULL; |
185 | |
|
186 | 0 | if (X509_PUBKEY_set(&pubkey, ctx->issuer_pkey)) |
187 | 0 | ikeyid = ossl_x509_pubkey_hash(pubkey); |
188 | 0 | X509_PUBKEY_free(pubkey); |
189 | 0 | } |
190 | 0 | if (keyid == 2 && ikeyid == NULL) { |
191 | 0 | ERR_raise(ERR_LIB_X509V3, X509V3_R_UNABLE_TO_GET_ISSUER_KEYID); |
192 | 0 | goto err; |
193 | 0 | } |
194 | 0 | } |
195 | | |
196 | 0 | if (issuer == 2 || (issuer == 1 && !ss && ikeyid == NULL)) { |
197 | 0 | isname = X509_NAME_dup(X509_get_issuer_name(issuer_cert)); |
198 | 0 | serial = ASN1_INTEGER_dup(X509_get0_serialNumber(issuer_cert)); |
199 | 0 | if (isname == NULL || serial == NULL) { |
200 | 0 | ERR_raise(ERR_LIB_X509V3, X509V3_R_UNABLE_TO_GET_ISSUER_DETAILS); |
201 | 0 | goto err; |
202 | 0 | } |
203 | 0 | } |
204 | | |
205 | 0 | if (isname != NULL) { |
206 | 0 | if ((gens = sk_GENERAL_NAME_new_null()) == NULL |
207 | 0 | || (gen = GENERAL_NAME_new()) == NULL) { |
208 | 0 | ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB); |
209 | 0 | goto err; |
210 | 0 | } |
211 | 0 | if (!sk_GENERAL_NAME_push(gens, gen)) { |
212 | 0 | ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB); |
213 | 0 | goto err; |
214 | 0 | } |
215 | 0 | gen->type = GEN_DIRNAME; |
216 | 0 | gen->d.dirn = isname; |
217 | 0 | } |
218 | | |
219 | 0 | akeyid->issuer = gens; |
220 | 0 | gen = NULL; |
221 | 0 | gens = NULL; |
222 | 0 | akeyid->serial = serial; |
223 | 0 | akeyid->keyid = ikeyid; |
224 | |
|
225 | 0 | return akeyid; |
226 | | |
227 | 0 | err: |
228 | 0 | sk_GENERAL_NAME_free(gens); |
229 | 0 | GENERAL_NAME_free(gen); |
230 | 0 | X509_NAME_free(isname); |
231 | 0 | ASN1_INTEGER_free(serial); |
232 | 0 | ASN1_OCTET_STRING_free(ikeyid); |
233 | 0 | AUTHORITY_KEYID_free(akeyid); |
234 | 0 | return NULL; |
235 | 0 | } |