crypto/x509/v3_akey.c

   1 /*
   2  * Copyright 1999-2016 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 "ext_dat.h"
  17
  18 static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
  19                                                  AUTHORITY_KEYID *akeyid,
  20                                                  STACK_OF(CONF_VALUE)
  21                                                  *extlist);
  22 static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
  23                                             X509V3_CTX *ctx,
  24                                             STACK_OF(CONF_VALUE) *values);
  25
  26 const X509V3_EXT_METHOD v3_akey_id = {
  27     NID_authority_key_identifier,
  28     X509V3_EXT_MULTILINE, ASN1_ITEM_ref(AUTHORITY_KEYID),
  29     0, 0, 0, 0,
  30     0, 0,
  31     (X509V3_EXT_I2V) i2v_AUTHORITY_KEYID,
  32     (X509V3_EXT_V2I)v2i_AUTHORITY_KEYID,
  33     0, 0,
  34     NULL
  35 };
  36
  37 static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
  38                                                  AUTHORITY_KEYID *akeyid,
  39                                                  STACK_OF(CONF_VALUE)
  40                                                  *extlist)
  41 {
  42     char *tmp;
  43     if (akeyid->keyid) {
  44         tmp = OPENSSL_buf2hexstr(akeyid->keyid->data, akeyid->keyid->length);
  45         X509V3_add_value((akeyid->issuer || akeyid->serial) ? "keyid" : NULL, tmp, &extlist);
  46         OPENSSL_free(tmp);
  47     }
  48     if (akeyid->issuer)
  49         extlist = i2v_GENERAL_NAMES(NULL, akeyid->issuer, extlist);
  50     if (akeyid->serial) {
  51         tmp = OPENSSL_buf2hexstr(akeyid->serial->data, akeyid->serial->length);
  52         X509V3_add_value("serial", tmp, &extlist);
  53         OPENSSL_free(tmp);
  54     }
  55     return extlist;
  56 }
  57
  58 /*-
  59  * Currently two options:
  60  * keyid: use the issuers subject keyid, the value 'always' means its is
  61  * an error if the issuer certificate doesn't have a key id.
  62  * issuer: use the issuers cert issuer and serial number. The default is
  63  * to only use this if keyid is not present. With the option 'always'
  64  * this is always included.
  65  */
  66
  67 static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
  68                                             X509V3_CTX *ctx,
  69                                             STACK_OF(CONF_VALUE) *values)
  70 {
  71     char keyid = 0, issuer = 0;
  72     int i;
  73     CONF_VALUE *cnf;
  74     ASN1_OCTET_STRING *ikeyid = NULL;
  75     X509_NAME *isname = NULL;
  76     GENERAL_NAMES *gens = NULL;
  77     GENERAL_NAME *gen = NULL;
  78     ASN1_INTEGER *serial = NULL;
  79     X509_EXTENSION *ext;
  80     X509 *cert;
  81     AUTHORITY_KEYID *akeyid;
  82
  83     for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
  84         cnf = sk_CONF_VALUE_value(values, i);
  85         if (strcmp(cnf->name, "keyid") == 0) {
  86             keyid = 1;
  87             if (cnf->value && strcmp(cnf->value, "always") == 0)
  88                 keyid = 2;
  89         } else if (strcmp(cnf->name, "issuer") == 0) {
  90             issuer = 1;
  91             if (cnf->value && strcmp(cnf->value, "always") == 0)
  92                 issuer = 2;
  93         } else {
  94             X509V3err(X509V3_F_V2I_AUTHORITY_KEYID, X509V3_R_UNKNOWN_OPTION);
  95             ERR_add_error_data(2, "name=", cnf->name);
  96             return NULL;
  97         }
  98     }
  99
 100     if (!ctx || !ctx->issuer_cert) {
 101         if (ctx && (ctx->flags == CTX_TEST))
 102             return AUTHORITY_KEYID_new();
 103         X509V3err(X509V3_F_V2I_AUTHORITY_KEYID,
 104                   X509V3_R_NO_ISSUER_CERTIFICATE);
 105         return NULL;
 106     }
 107
 108     cert = ctx->issuer_cert;
 109
 110     if (keyid) {
 111         i = X509_get_ext_by_NID(cert, NID_subject_key_identifier, -1);
 112         if ((i >= 0) && (ext = X509_get_ext(cert, i)))
 113             ikeyid = X509V3_EXT_d2i(ext);
 114         if (keyid == 2 && !ikeyid) {
 115             X509V3err(X509V3_F_V2I_AUTHORITY_KEYID,
 116                       X509V3_R_UNABLE_TO_GET_ISSUER_KEYID);
 117             return NULL;
 118         }
 119     }
 120
 121     if ((issuer && !ikeyid) || (issuer == 2)) {
 122         isname = X509_NAME_dup(X509_get_issuer_name(cert));
 123         serial = ASN1_INTEGER_dup(X509_get_serialNumber(cert));
 124         if (!isname || !serial) {
 125             X509V3err(X509V3_F_V2I_AUTHORITY_KEYID,
 126                       X509V3_R_UNABLE_TO_GET_ISSUER_DETAILS);
 127             goto err;
 128         }
 129     }
 130
 131     if ((akeyid = AUTHORITY_KEYID_new()) == NULL)
 132         goto err;
 133
 134     if (isname) {
 135         if ((gens = sk_GENERAL_NAME_new_null()) == NULL
 136             || (gen = GENERAL_NAME_new()) == NULL
 137             || !sk_GENERAL_NAME_push(gens, gen)) {
 138             X509V3err(X509V3_F_V2I_AUTHORITY_KEYID, ERR_R_MALLOC_FAILURE);
 139             goto err;
 140         }
 141         gen->type = GEN_DIRNAME;
 142         gen->d.dirn = isname;
 143     }
 144
 145     akeyid->issuer = gens;
 146     gen = NULL;
 147     gens = NULL;
 148     akeyid->serial = serial;
 149     akeyid->keyid = ikeyid;
 150
 151     return akeyid;
 152
 153  err:
 154     sk_GENERAL_NAME_free(gens);
 155     GENERAL_NAME_free(gen);
 156     X509_NAME_free(isname);
 157     ASN1_INTEGER_free(serial);
 158     ASN1_OCTET_STRING_free(ikeyid);
 159     return NULL;
 160 }