crypto/x509/v3_akid.c

   1 /*
   2  * Copyright 1999-2020 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 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 {
  43     char *tmp;
  44     if (akeyid->keyid) {
  45         tmp = OPENSSL_buf2hexstr(akeyid->keyid->data, akeyid->keyid->length);
  46         if (tmp == NULL) {
  47             ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
  48             return NULL;
  49         }
  50         X509V3_add_value((akeyid->issuer || akeyid->serial) ? "keyid" : NULL,
  51                          tmp, &extlist);
  52         OPENSSL_free(tmp);
  53     }
  54     if (akeyid->issuer)
  55         extlist = i2v_GENERAL_NAMES(NULL, akeyid->issuer, extlist);
  56     if (akeyid->serial) {
  57         tmp = OPENSSL_buf2hexstr(akeyid->serial->data, akeyid->serial->length);
  58         if (tmp == NULL) {
  59             ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
  60             return NULL;
  61         }
  62         X509V3_add_value("serial", tmp, &extlist);
  63         OPENSSL_free(tmp);
  64     }
  65     return extlist;
  66 }
  67
  68 /*-
  69  * Currently two options:
  70  * keyid: use the issuers subject keyid, the value 'always' means its is
  71  * an error if the issuer certificate doesn't have a key id.
  72  * issuer: use the issuers cert issuer and serial number. The default is
  73  * to only use this if keyid is not present. With the option 'always'
  74  * this is always included.
  75  */
  76
  77 static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
  78                                             X509V3_CTX *ctx,
  79                                             STACK_OF(CONF_VALUE) *values)
  80 {
  81     char keyid = 0, issuer = 0;
  82     int i, n = sk_CONF_VALUE_num(values);
  83     CONF_VALUE *cnf;
  84     ASN1_OCTET_STRING *ikeyid = NULL;
  85     X509_NAME *isname = NULL;
  86     GENERAL_NAMES *gens = NULL;
  87     GENERAL_NAME *gen = NULL;
  88     ASN1_INTEGER *serial = NULL;
  89     X509_EXTENSION *ext;
  90     X509 *issuer_cert;
  91     AUTHORITY_KEYID *akeyid = AUTHORITY_KEYID_new();
  92
  93     if (akeyid == NULL)
  94         goto err;
  95
  96     if (n == 1 && strcmp(sk_CONF_VALUE_value(values, 0)->name, "none") == 0) {
  97         return akeyid;
  98     }
  99
 100     for (i = 0; i < n; i++) {
 101         cnf = sk_CONF_VALUE_value(values, i);
 102         if (strcmp(cnf->name, "keyid") == 0) {
 103             keyid = 1;
 104             if (cnf->value && strcmp(cnf->value, "always") == 0)
 105                 keyid = 2;
 106         } else if (strcmp(cnf->name, "issuer") == 0) {
 107             issuer = 1;
 108             if (cnf->value && strcmp(cnf->value, "always") == 0)
 109                 issuer = 2;
 110         } else {
 111             ERR_raise_data(ERR_LIB_X509V3, X509V3_R_UNKNOWN_OPTION,
 112                            "name=%s", cnf->name);
 113             goto err;
 114         }
 115     }
 116
 117     if (ctx != NULL && (ctx->flags & X509V3_CTX_TEST) != 0)
 118         return akeyid;
 119
 120     if (ctx == NULL) {
 121         ERR_raise(ERR_LIB_X509V3, ERR_R_PASSED_NULL_PARAMETER);
 122         goto err;
 123     }
 124     if ((issuer_cert = ctx->issuer_cert) == NULL) {
 125         ERR_raise(ERR_LIB_X509V3, X509V3_R_NO_ISSUER_CERTIFICATE);
 126         goto err;
 127     }
 128
 129     if (keyid != 0) {
 130         /* prefer any pre-existing subject key identifier of the issuer cert */
 131         i = X509_get_ext_by_NID(issuer_cert, NID_subject_key_identifier, -1);
 132         if (i >= 0 && (ext = X509_get_ext(issuer_cert, i)) != NULL)
 133             ikeyid = X509V3_EXT_d2i(ext);
 134         if (ikeyid == NULL && ctx->issuer_pkey != NULL) { /* fallback */
 135             /* generate AKID from scratch, emulating s2i_skey_id(..., "hash") */
 136             X509_PUBKEY *pubkey = NULL;
 137
 138             if (X509_PUBKEY_set(&pubkey, ctx->issuer_pkey))
 139                 ikeyid = x509_pubkey_hash(pubkey);
 140             X509_PUBKEY_free(pubkey);
 141         }
 142         if ((keyid == 2 || issuer == 0)
 143             && (ikeyid == NULL
 144                 || ASN1_STRING_length(ikeyid) <= 2) /* indicating "none" */) {
 145             ERR_raise(ERR_LIB_X509V3, X509V3_R_UNABLE_TO_GET_ISSUER_KEYID);
 146             goto err;
 147         }
 148     }
 149
 150     if (issuer == 2 || (issuer == 1 && ikeyid == NULL)) {
 151         isname = X509_NAME_dup(X509_get_issuer_name(issuer_cert));
 152         serial = ASN1_INTEGER_dup(X509_get0_serialNumber(issuer_cert));
 153         if (isname == NULL || serial == NULL) {
 154             ERR_raise(ERR_LIB_X509V3, X509V3_R_UNABLE_TO_GET_ISSUER_DETAILS);
 155             goto err;
 156         }
 157     }
 158
 159     if (isname != NULL) {
 160         if ((gens = sk_GENERAL_NAME_new_null()) == NULL
 161             || (gen = GENERAL_NAME_new()) == NULL
 162             || !sk_GENERAL_NAME_push(gens, gen)) {
 163             ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
 164             goto err;
 165         }
 166         gen->type = GEN_DIRNAME;
 167         gen->d.dirn = isname;
 168     }
 169
 170     akeyid->issuer = gens;
 171     gen = NULL;
 172     gens = NULL;
 173     akeyid->serial = serial;
 174     akeyid->keyid = ikeyid;
 175
 176     return akeyid;
 177
 178  err:
 179     sk_GENERAL_NAME_free(gens);
 180     GENERAL_NAME_free(gen);
 181     X509_NAME_free(isname);
 182     ASN1_INTEGER_free(serial);
 183     ASN1_OCTET_STRING_free(ikeyid);
 184     AUTHORITY_KEYID_free(akeyid);
 185     return NULL;
 186 }