/* $OpenBSD: asn1_item.c,v 1.5 2022/05/24 20:20:19 tb Exp $ */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ /* ==================================================================== * Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * openssl-core@openssl.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.openssl.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com). This product includes software written by Tim * Hudson (tjh@cryptsoft.com). * */ #include #include #include #include #include #include "asn1_locl.h" #include "evp_locl.h" /* * ASN1_ITEM version of dup: this follows the model above except we don't need * to allocate the buffer. At some point this could be rewritten to directly dup * the underlying structure instead of doing and encode and decode. */ int ASN1_item_digest(const ASN1_ITEM *it, const EVP_MD *type, void *asn, unsigned char *md, unsigned int *len) { int i; unsigned char *str = NULL; i = ASN1_item_i2d(asn, &str, it); if (!str) return (0); if (!EVP_Digest(str, i, md, len, type, NULL)) { free(str); return (0); } free(str); return (1); } void * ASN1_item_dup(const ASN1_ITEM *it, void *x) { unsigned char *b = NULL; const unsigned char *p; long i; void *ret; if (x == NULL) return (NULL); i = ASN1_item_i2d(x, &b, it); if (b == NULL) { ASN1error(ERR_R_MALLOC_FAILURE); return (NULL); } p = b; ret = ASN1_item_d2i(NULL, &p, i, it); free(b); return (ret); } /* Pack an ASN1 object into an ASN1_STRING. */ ASN1_STRING * ASN1_item_pack(void *obj, const ASN1_ITEM *it, ASN1_STRING **oct) { ASN1_STRING *octmp; if (!oct || !*oct) { if (!(octmp = ASN1_STRING_new ())) { ASN1error(ERR_R_MALLOC_FAILURE); return NULL; } } else octmp = *oct; free(octmp->data); octmp->data = NULL; if (!(octmp->length = ASN1_item_i2d(obj, &octmp->data, it))) { ASN1error(ASN1_R_ENCODE_ERROR); goto err; } if (!octmp->data) { ASN1error(ERR_R_MALLOC_FAILURE); goto err; } if (oct) *oct = octmp; return octmp; err: if (!oct || octmp != *oct) ASN1_STRING_free(octmp); return NULL; } /* Extract an ASN1 object from an ASN1_STRING. */ void * ASN1_item_unpack(const ASN1_STRING *oct, const ASN1_ITEM *it) { const unsigned char *p; void *ret; p = oct->data; if (!(ret = ASN1_item_d2i(NULL, &p, oct->length, it))) ASN1error(ASN1_R_DECODE_ERROR); return ret; } int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2, ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey, const EVP_MD *type) { EVP_MD_CTX ctx; EVP_MD_CTX_init(&ctx); if (!EVP_DigestSignInit(&ctx, NULL, type, NULL, pkey)) { EVP_MD_CTX_cleanup(&ctx); return 0; } return ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, &ctx); } int ASN1_item_sign_ctx(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2, ASN1_BIT_STRING *signature, void *asn, EVP_MD_CTX *ctx) { const EVP_MD *type; EVP_PKEY *pkey; unsigned char *buf_in = NULL, *buf_out = NULL; size_t buf_out_len = 0; int in_len = 0, out_len = 0; int signid, paramtype; int rv = 2; int ret = 0; type = EVP_MD_CTX_md(ctx); pkey = EVP_PKEY_CTX_get0_pkey(ctx->pctx); if (!type || !pkey) { ASN1error(ASN1_R_CONTEXT_NOT_INITIALISED); return 0; } if (pkey->ameth->item_sign) { rv = pkey->ameth->item_sign(ctx, it, asn, algor1, algor2, signature); if (rv == 1) out_len = signature->length; /* Return value meanings: * <=0: error. * 1: method does everything. * 2: carry on as normal. * 3: ASN1 method sets algorithm identifiers: just sign. */ if (rv <= 0) ASN1error(ERR_R_EVP_LIB); if (rv <= 1) goto err; } if (rv == 2) { if (!pkey->ameth || !OBJ_find_sigid_by_algs(&signid, EVP_MD_nid(type), pkey->ameth->pkey_id)) { ASN1error(ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED); return 0; } if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL) paramtype = V_ASN1_NULL; else paramtype = V_ASN1_UNDEF; if (algor1) X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL); if (algor2) X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL); } if ((in_len = ASN1_item_i2d(asn, &buf_in, it)) <= 0) { in_len = 0; goto err; } if ((out_len = EVP_PKEY_size(pkey)) <= 0) { out_len = 0; goto err; } if ((buf_out = malloc(out_len)) == NULL) { ASN1error(ERR_R_MALLOC_FAILURE); goto err; } buf_out_len = out_len; if (!EVP_DigestSignUpdate(ctx, buf_in, in_len) || !EVP_DigestSignFinal(ctx, buf_out, &buf_out_len)) { ASN1error(ERR_R_EVP_LIB); goto err; } if (buf_out_len > INT_MAX) { ASN1error(ASN1_R_TOO_LONG); goto err; } ASN1_STRING_set0(signature, buf_out, (int)buf_out_len); buf_out = NULL; if (!asn1_abs_set_unused_bits(signature, 0)) { ASN1error(ERR_R_ASN1_LIB); goto err; } ret = (int)buf_out_len; err: EVP_MD_CTX_cleanup(ctx); freezero(buf_in, in_len); freezero(buf_out, out_len); return ret; } int ASN1_item_verify(const ASN1_ITEM *it, X509_ALGOR *a, ASN1_BIT_STRING *signature, void *asn, EVP_PKEY *pkey) { EVP_MD_CTX ctx; unsigned char *buf_in = NULL; int ret = -1, inl; int mdnid, pknid; if (!pkey) { ASN1error(ERR_R_PASSED_NULL_PARAMETER); return -1; } if (signature->type == V_ASN1_BIT_STRING && signature->flags & 0x7) { ASN1error(ASN1_R_INVALID_BIT_STRING_BITS_LEFT); return -1; } EVP_MD_CTX_init(&ctx); /* Convert signature OID into digest and public key OIDs */ if (!OBJ_find_sigid_algs(OBJ_obj2nid(a->algorithm), &mdnid, &pknid)) { ASN1error(ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM); goto err; } if (mdnid == NID_undef) { if (!pkey->ameth || !pkey->ameth->item_verify) { ASN1error(ASN1_R_UNKNOWN_SIGNATURE_ALGORITHM); goto err; } ret = pkey->ameth->item_verify(&ctx, it, asn, a, signature, pkey); /* Return value of 2 means carry on, anything else means we * exit straight away: either a fatal error of the underlying * verification routine handles all verification. */ if (ret != 2) goto err; ret = -1; } else { const EVP_MD *type; type = EVP_get_digestbynid(mdnid); if (type == NULL) { ASN1error(ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM); goto err; } /* Check public key OID matches public key type */ if (EVP_PKEY_type(pknid) != pkey->ameth->pkey_id) { ASN1error(ASN1_R_WRONG_PUBLIC_KEY_TYPE); goto err; } if (!EVP_DigestVerifyInit(&ctx, NULL, type, NULL, pkey)) { ASN1error(ERR_R_EVP_LIB); ret = 0; goto err; } } inl = ASN1_item_i2d(asn, &buf_in, it); if (buf_in == NULL) { ASN1error(ERR_R_MALLOC_FAILURE); goto err; } if (!EVP_DigestVerifyUpdate(&ctx, buf_in, inl)) { ASN1error(ERR_R_EVP_LIB); ret = 0; goto err; } freezero(buf_in, (unsigned int)inl); if (EVP_DigestVerifyFinal(&ctx, signature->data, (size_t)signature->length) <= 0) { ASN1error(ERR_R_EVP_LIB); ret = 0; goto err; } /* we don't need to zero the 'ctx' because we just checked * public information */ /* memset(&ctx,0,sizeof(ctx)); */ ret = 1; err: EVP_MD_CTX_cleanup(&ctx); return (ret); } #define HEADER_SIZE 8 #define ASN1_CHUNK_INITIAL_SIZE (16 * 1024) int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb) { BUF_MEM *b; unsigned char *p; const unsigned char *q; long slen; int i, inf, tag, xclass; size_t want = HEADER_SIZE; int eos = 0; size_t off = 0; size_t len = 0; b = BUF_MEM_new(); if (b == NULL) { ASN1error(ERR_R_MALLOC_FAILURE); return -1; } ERR_clear_error(); for (;;) { if (want >= (len - off)) { want -= (len - off); if (len + want < len || !BUF_MEM_grow_clean(b, len + want)) { ASN1error(ERR_R_MALLOC_FAILURE); goto err; } i = BIO_read(in, &(b->data[len]), want); if ((i < 0) && ((len - off) == 0)) { ASN1error(ASN1_R_NOT_ENOUGH_DATA); goto err; } if (i > 0) { if (len + i < len) { ASN1error(ASN1_R_TOO_LONG); goto err; } len += i; } } /* else data already loaded */ p = (unsigned char *) & (b->data[off]); q = p; inf = ASN1_get_object(&q, &slen, &tag, &xclass, len - off); if (inf & 0x80) { unsigned long e; e = ERR_GET_REASON(ERR_peek_error()); if (e != ASN1_R_TOO_LONG) goto err; else ERR_clear_error(); /* clear error */ } i = q - p; /* header length */ off += i; /* end of data */ if (inf & 1) { /* no data body so go round again */ eos++; if (eos < 0) { ASN1error(ASN1_R_HEADER_TOO_LONG); goto err; } want = HEADER_SIZE; } else if (eos && slen == 0 && tag == V_ASN1_EOC) { /* eos value, so go back and read another header */ eos--; if (eos <= 0) break; else want = HEADER_SIZE; } else { /* suck in slen bytes of data */ want = slen; if (want > (len - off)) { size_t chunk_max = ASN1_CHUNK_INITIAL_SIZE; want -= (len - off); if (want > INT_MAX /* BIO_read takes an int length */ || len+want < len) { ASN1error(ASN1_R_TOO_LONG); goto err; } while (want > 0) { /* * Read content in chunks of increasing size * so we can return an error for EOF without * having to allocate the entire content length * in one go. */ size_t chunk = want > chunk_max ? chunk_max : want; if (!BUF_MEM_grow_clean(b, len + chunk)) { ASN1error(ERR_R_MALLOC_FAILURE); goto err; } want -= chunk; while (chunk > 0) { i = BIO_read(in, &(b->data[len]), chunk); if (i <= 0) { ASN1error(ASN1_R_NOT_ENOUGH_DATA); goto err; } /* * This can't overflow because |len+want| * didn't overflow. */ len += i; chunk -= i; } if (chunk_max < INT_MAX/2) chunk_max *= 2; } } if (off + slen < off) { ASN1error(ASN1_R_TOO_LONG); goto err; } off += slen; if (eos <= 0) { break; } else want = HEADER_SIZE; } } if (off > INT_MAX) { ASN1error(ASN1_R_TOO_LONG); goto err; } *pb = b; return off; err: if (b != NULL) BUF_MEM_free(b); return -1; } void * ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x) { BUF_MEM *b = NULL; const unsigned char *p; void *ret = NULL; int len; len = asn1_d2i_read_bio(in, &b); if (len < 0) goto err; p = (const unsigned char *)b->data; ret = ASN1_item_d2i(x, &p, len, it); err: if (b != NULL) BUF_MEM_free(b); return (ret); } void * ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x) { BIO *b; char *ret; if ((b = BIO_new(BIO_s_file())) == NULL) { ASN1error(ERR_R_BUF_LIB); return (NULL); } BIO_set_fp(b, in, BIO_NOCLOSE); ret = ASN1_item_d2i_bio(it, b, x); BIO_free(b); return (ret); } int ASN1_item_i2d_bio(const ASN1_ITEM *it, BIO *out, void *x) { unsigned char *b = NULL; int i, j = 0, n, ret = 1; n = ASN1_item_i2d(x, &b, it); if (b == NULL) { ASN1error(ERR_R_MALLOC_FAILURE); return (0); } for (;;) { i = BIO_write(out, &(b[j]), n); if (i == n) break; if (i <= 0) { ret = 0; break; } j += i; n -= i; } free(b); return (ret); } int ASN1_item_i2d_fp(const ASN1_ITEM *it, FILE *out, void *x) { BIO *b; int ret; if ((b = BIO_new(BIO_s_file())) == NULL) { ASN1error(ERR_R_BUF_LIB); return (0); } BIO_set_fp(b, out, BIO_NOCLOSE); ret = ASN1_item_i2d_bio(it, b, x); BIO_free(b); return (ret); }