crypto/cmp/cmp_hdr.c

   1 /*
   2  * Copyright 2007-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  * Copyright Nokia 2007-2019
   4  * Copyright Siemens AG 2015-2019
   5  *
   6  * Licensed under the Apache License 2.0 (the "License").  You may not use
   7  * this file except in compliance with the License.  You can obtain a copy
   8  * in the file LICENSE in the source distribution or at
   9  * https://www.openssl.org/source/license.html
  10  */
  11
  12 /* CMP functions for PKIHeader handling */
  13
  14 #include "cmp_local.h"
  15
  16 #include <openssl/rand.h>
  17
  18 /* explicit #includes not strictly needed since implied by the above: */
  19 #include <openssl/asn1t.h>
  20 #include <openssl/cmp.h>
  21 #include <openssl/err.h>
  22
  23 DEFINE_STACK_OF(ASN1_UTF8STRING)
  24 DEFINE_STACK_OF(OSSL_CMP_ITAV)
  25
  26 int ossl_cmp_hdr_set_pvno(OSSL_CMP_PKIHEADER *hdr, int pvno)
  27 {
  28     if (!ossl_assert(hdr != NULL))
  29         return 0;
  30     return ASN1_INTEGER_set(hdr->pvno, pvno);
  31 }
  32
  33 int ossl_cmp_hdr_get_pvno(const OSSL_CMP_PKIHEADER *hdr)
  34 {
  35     int64_t pvno;
  36
  37     if (!ossl_assert(hdr != NULL))
  38         return -1;
  39     if (!ASN1_INTEGER_get_int64(&pvno, hdr->pvno) || pvno < 0 || pvno > INT_MAX)
  40         return -1;
  41     return (int)pvno;
  42 }
  43
  44 int ossl_cmp_hdr_get_protection_nid(const OSSL_CMP_PKIHEADER *hdr)
  45 {
  46     if (!ossl_assert(hdr != NULL)
  47             || hdr->protectionAlg == NULL)
  48         return NID_undef;
  49     return OBJ_obj2nid(hdr->protectionAlg->algorithm);
  50 }
  51
  52 ASN1_OCTET_STRING *OSSL_CMP_HDR_get0_transactionID(const
  53                                                    OSSL_CMP_PKIHEADER *hdr)
  54 {
  55     if (hdr == NULL) {
  56         CMPerr(0, CMP_R_NULL_ARGUMENT);
  57         return NULL;
  58     }
  59     return hdr->transactionID;
  60 }
  61
  62 ASN1_OCTET_STRING *ossl_cmp_hdr_get0_senderNonce(const OSSL_CMP_PKIHEADER *hdr)
  63 {
  64     if (!ossl_assert(hdr != NULL))
  65         return NULL;
  66     return hdr->senderNonce;
  67 }
  68
  69 ASN1_OCTET_STRING *OSSL_CMP_HDR_get0_recipNonce(const OSSL_CMP_PKIHEADER *hdr)
  70 {
  71     if (hdr == NULL) {
  72         CMPerr(0, CMP_R_NULL_ARGUMENT);
  73         return NULL;
  74     }
  75     return hdr->recipNonce;
  76 }
  77
  78 int ossl_cmp_general_name_is_NULL_DN(GENERAL_NAME *name)
  79 {
  80     X509_NAME *null = X509_NAME_new();
  81     int res = name == NULL || null == NULL
  82         || (name->type == GEN_DIRNAME
  83                 && X509_NAME_cmp(name->d.directoryName, null) == 0);
  84
  85     X509_NAME_free(null);
  86     return res;
  87 }
  88
  89 /* assign to *tgt a copy of src (which may be NULL to indicate an empty DN) */
  90 static int set1_general_name(GENERAL_NAME **tgt, const X509_NAME *src)
  91 {
  92     GENERAL_NAME *name;
  93
  94     if (!ossl_assert(tgt != NULL))
  95         return 0;
  96     if ((name = GENERAL_NAME_new()) == NULL)
  97         goto err;
  98     name->type = GEN_DIRNAME;
  99
 100     if (src == NULL) { /* NULL-DN */
 101         if ((name->d.directoryName = X509_NAME_new()) == NULL)
 102             goto err;
 103     } else if (!X509_NAME_set(&name->d.directoryName, src)) {
 104         goto err;
 105     }
 106
 107     GENERAL_NAME_free(*tgt);
 108     *tgt = name;
 109
 110     return 1;
 111
 112  err:
 113     GENERAL_NAME_free(name);
 114     return 0;
 115 }
 116
 117 /*
 118  * Set the sender name in PKIHeader.
 119  * when nm is NULL, sender is set to an empty string
 120  * returns 1 on success, 0 on error
 121  */
 122 int ossl_cmp_hdr_set1_sender(OSSL_CMP_PKIHEADER *hdr, const X509_NAME *nm)
 123 {
 124     if (!ossl_assert(hdr != NULL))
 125         return 0;
 126     return set1_general_name(&hdr->sender, nm);
 127 }
 128
 129 int ossl_cmp_hdr_set1_recipient(OSSL_CMP_PKIHEADER *hdr, const X509_NAME *nm)
 130 {
 131     if (!ossl_assert(hdr != NULL))
 132         return 0;
 133     return set1_general_name(&hdr->recipient, nm);
 134 }
 135
 136 int ossl_cmp_hdr_update_messageTime(OSSL_CMP_PKIHEADER *hdr)
 137 {
 138     if (!ossl_assert(hdr != NULL))
 139         return 0;
 140     if (hdr->messageTime == NULL
 141             && (hdr->messageTime = ASN1_GENERALIZEDTIME_new()) == NULL)
 142         return 0;
 143     return ASN1_GENERALIZEDTIME_set(hdr->messageTime, time(NULL)) != NULL;
 144 }
 145
 146 /* assign to *tgt a random byte array of given length */
 147 static int set_random(ASN1_OCTET_STRING **tgt, OSSL_CMP_CTX *ctx, size_t len)
 148 {
 149     unsigned char *bytes = OPENSSL_malloc(len);
 150     int res = 0;
 151
 152     if (bytes == NULL || RAND_bytes_ex(ctx->libctx, bytes, len) <= 0)
 153         CMPerr(0, CMP_R_FAILURE_OBTAINING_RANDOM);
 154     else
 155         res = ossl_cmp_asn1_octet_string_set1_bytes(tgt, bytes, len);
 156     OPENSSL_free(bytes);
 157     return res;
 158 }
 159
 160 int ossl_cmp_hdr_set1_senderKID(OSSL_CMP_PKIHEADER *hdr,
 161                                 const ASN1_OCTET_STRING *senderKID)
 162 {
 163     if (!ossl_assert(hdr != NULL))
 164         return 0;
 165     return ossl_cmp_asn1_octet_string_set1(&hdr->senderKID, senderKID);
 166 }
 167
 168 /* push the given text string to the given PKIFREETEXT ft */
 169 int ossl_cmp_hdr_push0_freeText(OSSL_CMP_PKIHEADER *hdr, ASN1_UTF8STRING *text)
 170 {
 171     if (!ossl_assert(hdr != NULL && text != NULL))
 172         return 0;
 173
 174     if (hdr->freeText == NULL
 175             && (hdr->freeText = sk_ASN1_UTF8STRING_new_null()) == NULL)
 176         return 0;
 177
 178     return sk_ASN1_UTF8STRING_push(hdr->freeText, text);
 179 }
 180
 181 int ossl_cmp_hdr_push1_freeText(OSSL_CMP_PKIHEADER *hdr, ASN1_UTF8STRING *text)
 182 {
 183     if (!ossl_assert(hdr != NULL && text != NULL))
 184         return 0;
 185
 186     if (hdr->freeText == NULL
 187             && (hdr->freeText = sk_ASN1_UTF8STRING_new_null()) == NULL)
 188         return 0;
 189
 190     return
 191         ossl_cmp_sk_ASN1_UTF8STRING_push_str(hdr->freeText, (char *)text->data);
 192 }
 193
 194 int ossl_cmp_hdr_generalInfo_push0_item(OSSL_CMP_PKIHEADER *hdr,
 195                                         OSSL_CMP_ITAV *itav)
 196 {
 197     if (!ossl_assert(hdr != NULL && itav != NULL))
 198         return 0;
 199     return OSSL_CMP_ITAV_push0_stack_item(&hdr->generalInfo, itav);
 200 }
 201
 202 int ossl_cmp_hdr_generalInfo_push1_items(OSSL_CMP_PKIHEADER *hdr,
 203                                          const STACK_OF(OSSL_CMP_ITAV) *itavs)
 204 {
 205     int i;
 206     OSSL_CMP_ITAV *itav;
 207
 208     if (!ossl_assert(hdr != NULL))
 209         return 0;
 210
 211     for (i = 0; i < sk_OSSL_CMP_ITAV_num(itavs); i++) {
 212         itav = OSSL_CMP_ITAV_dup(sk_OSSL_CMP_ITAV_value(itavs, i));
 213         if (itav == NULL)
 214             return 0;
 215
 216         if (!ossl_cmp_hdr_generalInfo_push0_item(hdr, itav)) {
 217             OSSL_CMP_ITAV_free(itav);
 218             return 0;
 219         }
 220     }
 221     return 1;
 222 }
 223
 224 int ossl_cmp_hdr_set_implicitConfirm(OSSL_CMP_PKIHEADER *hdr)
 225 {
 226     OSSL_CMP_ITAV *itav;
 227     ASN1_TYPE *asn1null;
 228
 229     if (!ossl_assert(hdr != NULL))
 230         return 0;
 231     asn1null = (ASN1_TYPE *)ASN1_NULL_new();
 232     if (asn1null == NULL)
 233         return 0;
 234     if ((itav = OSSL_CMP_ITAV_create(OBJ_nid2obj(NID_id_it_implicitConfirm),
 235                                      asn1null)) == NULL)
 236         goto err;
 237     if (!ossl_cmp_hdr_generalInfo_push0_item(hdr, itav))
 238         goto err;
 239     return 1;
 240
 241  err:
 242     ASN1_TYPE_free(asn1null);
 243     OSSL_CMP_ITAV_free(itav);
 244     return 0;
 245 }
 246
 247 /* return 1 if implicitConfirm in the generalInfo field of the header is set */
 248 int ossl_cmp_hdr_has_implicitConfirm(const OSSL_CMP_PKIHEADER *hdr)
 249 {
 250     int itavCount;
 251     int i;
 252     OSSL_CMP_ITAV *itav;
 253
 254     if (!ossl_assert(hdr != NULL))
 255         return 0;
 256
 257     itavCount = sk_OSSL_CMP_ITAV_num(hdr->generalInfo);
 258     for (i = 0; i < itavCount; i++) {
 259         itav = sk_OSSL_CMP_ITAV_value(hdr->generalInfo, i);
 260         if (itav != NULL
 261                 && OBJ_obj2nid(itav->infoType) == NID_id_it_implicitConfirm)
 262             return 1;
 263     }
 264
 265     return 0;
 266 }
 267
 268 /*
 269  * set ctx->transactionID in CMP header
 270  * if ctx->transactionID is NULL, a random one is created with 128 bit
 271  * according to section 5.1.1:
 272  *
 273  * It is RECOMMENDED that the clients fill the transactionID field with
 274  * 128 bits of (pseudo-) random data for the start of a transaction to
 275  * reduce the probability of having the transactionID in use at the server.
 276  */
 277 int ossl_cmp_hdr_set_transactionID(OSSL_CMP_CTX *ctx, OSSL_CMP_PKIHEADER *hdr)
 278 {
 279     if (ctx->transactionID == NULL
 280         && !set_random(&ctx->transactionID, ctx, OSSL_CMP_TRANSACTIONID_LENGTH))
 281         return 0;
 282     return ossl_cmp_asn1_octet_string_set1(&hdr->transactionID,
 283                                            ctx->transactionID);
 284 }
 285
 286 /* fill in all fields of the hdr according to the info given in ctx */
 287 int ossl_cmp_hdr_init(OSSL_CMP_CTX *ctx, OSSL_CMP_PKIHEADER *hdr)
 288 {
 289     const X509_NAME *sender;
 290     const X509_NAME *rcp = NULL;
 291
 292     if (!ossl_assert(ctx != NULL && hdr != NULL))
 293         return 0;
 294
 295     /* set the CMP version */
 296     if (!ossl_cmp_hdr_set_pvno(hdr, OSSL_CMP_PVNO))
 297         return 0;
 298
 299     /*
 300      * If neither protection cert nor oldCert nor subject are given,
 301      * sender name is not known to the client and thus set to NULL-DN
 302      */
 303     sender = ctx->cert != NULL ? X509_get_subject_name(ctx->cert) :
 304         ctx->oldCert != NULL ? X509_get_subject_name(ctx->oldCert) :
 305         ctx->subjectName;
 306     if (!ossl_cmp_hdr_set1_sender(hdr, sender))
 307         return 0;
 308
 309     /* determine recipient entry in PKIHeader */
 310     if (ctx->recipient != NULL)
 311         rcp = ctx->recipient;
 312     else if (ctx->srvCert != NULL)
 313         rcp = X509_get_subject_name(ctx->srvCert);
 314     else if (ctx->issuer != NULL)
 315         rcp = ctx->issuer;
 316     else if (ctx->oldCert != NULL)
 317         rcp = X509_get_issuer_name(ctx->oldCert);
 318     else if (ctx->cert != NULL)
 319         rcp = X509_get_issuer_name(ctx->cert);
 320     if (!ossl_cmp_hdr_set1_recipient(hdr, rcp))
 321         return 0;
 322
 323     /* set current time as message time */
 324     if (!ossl_cmp_hdr_update_messageTime(hdr))
 325         return 0;
 326
 327     if (ctx->recipNonce != NULL
 328             && !ossl_cmp_asn1_octet_string_set1(&hdr->recipNonce,
 329                                                 ctx->recipNonce))
 330         return 0;
 331
 332     if (!ossl_cmp_hdr_set_transactionID(ctx, hdr))
 333         return 0;
 334
 335     /*-
 336      * set random senderNonce
 337      * according to section 5.1.1:
 338      *
 339      * senderNonce                  present
 340      *         -- 128 (pseudo-)random bits
 341      * The senderNonce and recipNonce fields protect the PKIMessage against
 342      * replay attacks. The senderNonce will typically be 128 bits of
 343      * (pseudo-) random data generated by the sender, whereas the recipNonce
 344      * is copied from the senderNonce of the previous message in the
 345      * transaction.
 346      */
 347     if (!set_random(&hdr->senderNonce, ctx, OSSL_CMP_SENDERNONCE_LENGTH))
 348         return 0;
 349
 350     /* store senderNonce - for cmp with recipNonce in next outgoing msg */
 351     if (!OSSL_CMP_CTX_set1_senderNonce(ctx, hdr->senderNonce))
 352         return 0;
 353
 354     /*-
 355      * freeText                [7] PKIFreeText OPTIONAL,
 356      * -- this may be used to indicate context-specific instructions
 357      * -- (this field is intended for human consumption)
 358      */
 359     if (ctx->freeText != NULL
 360             && !ossl_cmp_hdr_push1_freeText(hdr, ctx->freeText))
 361         return 0;
 362
 363     return 1;
 364 }