From ec5add8784a2ffacd3391daae7937e04225da9da Mon Sep 17 00:00:00 2001 From: "Dr. Stephen Henson" Date: Sun, 31 Dec 2000 17:31:57 +0000 Subject: [PATCH] Fix the S/MIME code so it now works again and uses the new ASN1 code. --- CHANGES | 13 +++++++++++ crypto/pkcs7/pk7_asn1.c | 25 ++++++++++++++++++-- crypto/pkcs7/pk7_doit.c | 51 +++++++++++++---------------------------- crypto/pkcs7/pkcs7.h | 3 +++ 4 files changed, 55 insertions(+), 37 deletions(-) diff --git a/CHANGES b/CHANGES index 667b0f74a6..7ba48fcb88 100644 --- a/CHANGES +++ b/CHANGES @@ -3,6 +3,19 @@ Changes between 0.9.6 and 0.9.7 [xx XXX 2000] + *) Fix the PKCS#7 (S/MIME) code to work with new ASN1. Two new + ASN1_ITEM structures help with sign and verify. PKCS7_ATTR_SIGN + uses the special reorder version of SET OF to sort the attributes + and reorder them to match the encoded order. This resolves a long + standing problem: a verify on a PKCS7 structure just after signing + it used to fail because the attribute order did not match the + encoded order. PKCS7_ATTR_VERIFY does not reorder the attributes: + it uses the received order. This is necessary to tolerate some broken + software that does not order SET OF. This is handled by encoding + as a SEQUENCE OF but using implicit tagging (with UNIVERSAL class) + to produce the required SET OF. + [Steve Henson] + *) Have mk1mf.pl generate the macros OPENSSL_BUILD_SHLIBCRYPTO and OPENSSL_BUILD_SHLIBSSL and use them appropriately in the header files to get correct declarations of the ASN.1 item variables. diff --git a/crypto/pkcs7/pk7_asn1.c b/crypto/pkcs7/pk7_asn1.c index 8d06c0b680..9c5eda2b36 100644 --- a/crypto/pkcs7/pk7_asn1.c +++ b/crypto/pkcs7/pk7_asn1.c @@ -108,8 +108,10 @@ ASN1_SEQUENCE_cb(PKCS7_SIGNER_INFO, si_cb) = { ASN1_SIMPLE(PKCS7_SIGNER_INFO, version, ASN1_INTEGER), ASN1_SIMPLE(PKCS7_SIGNER_INFO, issuer_and_serial, PKCS7_ISSUER_AND_SERIAL), ASN1_SIMPLE(PKCS7_SIGNER_INFO, digest_alg, X509_ALGOR), - /* NB this should be a SET OF but we use a SEQUENCE OF so the original order - * is retained when the structure is reencoded. + /* NB this should be a SET OF but we use a SEQUENCE OF so the + * original order * is retained when the structure is reencoded. + * Since the attributes are implicitly tagged this will not affect + * the encoding. */ ASN1_IMP_SEQUENCE_OF_OPT(PKCS7_SIGNER_INFO, auth_attr, X509_ATTRIBUTE, 0), ASN1_SIMPLE(PKCS7_SIGNER_INFO, digest_enc_alg, X509_ALGOR), @@ -178,3 +180,22 @@ ASN1_SEQUENCE(PKCS7_DIGEST) = { } ASN1_SEQUENCE_END(PKCS7_DIGEST); IMPLEMENT_ASN1_FUNCTIONS(PKCS7_DIGEST) + +/* Specials for authenticated attributes */ + +/* When signing attributes we want to reorder them to match the sorted + * encoding. + */ + +ASN1_ITEM_TEMPLATE(PKCS7_ATTR_SIGN) = + ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SET_ORDER, 0, PKCS7_ATTRIBUTES, X509_ATTRIBUTE) +ASN1_ITEM_TEMPLATE_END(PKCS7_ATTR_SIGN); + +/* When verifying attributes we need to use the received order. So + * we use SEQUENCE OF and tag it to SET OF + */ + +ASN1_ITEM_TEMPLATE(PKCS7_ATTR_VERIFY) = + ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF | ASN1_TFLG_IMPTAG | ASN1_TFLG_UNIVERSAL, + V_ASN1_SET, PKCS7_ATTRIBUTES, X509_ATTRIBUTE) +ASN1_ITEM_TEMPLATE_END(PKCS7_ATTR_VERIFY); diff --git a/crypto/pkcs7/pk7_doit.c b/crypto/pkcs7/pk7_doit.c index d294c5e288..022ce46c45 100644 --- a/crypto/pkcs7/pk7_doit.c +++ b/crypto/pkcs7/pk7_doit.c @@ -471,8 +471,6 @@ int PKCS7_dataFinal(PKCS7 *p7, BIO *bio) EVP_MD_CTX *mdc,ctx_tmp; STACK_OF(X509_ATTRIBUTE) *sk; STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL; - unsigned char *p,*pp=NULL; - int x; ASN1_OCTET_STRING *os=NULL; i=OBJ_obj2nid(p7->type); @@ -552,8 +550,8 @@ int PKCS7_dataFinal(PKCS7 *p7, BIO *bio) * attribute and only sign the attributes */ if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) { - unsigned char md_data[EVP_MAX_MD_SIZE]; - unsigned int md_len; + unsigned char md_data[EVP_MAX_MD_SIZE], *abuf=NULL; + unsigned int md_len, alen; ASN1_OCTET_STRING *digest; ASN1_UTCTIME *sign_time; const EVP_MD *md_tmp; @@ -573,19 +571,13 @@ int PKCS7_dataFinal(PKCS7 *p7, BIO *bio) NID_pkcs9_messageDigest, V_ASN1_OCTET_STRING,digest); - /* Now sign the mess */ + /* Now sign the attributes */ EVP_SignInit(&ctx_tmp,md_tmp); - x=i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,NULL, - i2d_X509_ATTRIBUTE, - V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET); - pp=(unsigned char *)OPENSSL_malloc(x); - p=pp; - i2d_ASN1_SET_OF_X509_ATTRIBUTE(sk,&p, - i2d_X509_ATTRIBUTE, - V_ASN1_SET,V_ASN1_UNIVERSAL,IS_SET); - EVP_SignUpdate(&ctx_tmp,pp,x); - OPENSSL_free(pp); - pp=NULL; + alen = ASN1_item_i2d((ASN1_VALUE *)sk,&abuf, + &PKCS7_ATTR_SIGN_it); + if(!abuf) goto err; + EVP_SignUpdate(&ctx_tmp,abuf,alen); + OPENSSL_free(abuf); } if (si->pkey->type == EVP_PKEY_DSA) @@ -627,9 +619,6 @@ int PKCS7_dataFinal(PKCS7 *p7, BIO *bio) (unsigned char *)buf_mem->data,buf_mem->length); #endif } - if (pp != NULL) OPENSSL_free(pp); - pp=NULL; - ret=1; err: if (buf != NULL) BUF_MEM_free(buf); @@ -691,7 +680,6 @@ int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si, { ASN1_OCTET_STRING *os; EVP_MD_CTX mdc_tmp,*mdc; - unsigned char *pp,*p; int ret=0,i; int md_type; STACK_OF(X509_ATTRIBUTE) *sk; @@ -736,8 +724,8 @@ int PKCS7_signatureVerify(BIO *bio, PKCS7 *p7, PKCS7_SIGNER_INFO *si, sk=si->auth_attr; if ((sk != NULL) && (sk_X509_ATTRIBUTE_num(sk) != 0)) { - unsigned char md_dat[EVP_MAX_MD_SIZE]; - unsigned int md_len; + unsigned char md_dat[EVP_MAX_MD_SIZE], *abuf = NULL; + unsigned int md_len, alen; ASN1_OCTET_STRING *message_digest; EVP_DigestFinal(&mdc_tmp,md_dat,&md_len); @@ -766,19 +754,12 @@ for (ii=0; iienc_digest; diff --git a/crypto/pkcs7/pkcs7.h b/crypto/pkcs7/pkcs7.h index 2835d58a58..4852c59dac 100644 --- a/crypto/pkcs7/pkcs7.h +++ b/crypto/pkcs7/pkcs7.h @@ -295,6 +295,9 @@ DECLARE_ASN1_FUNCTIONS(PKCS7_DIGEST) DECLARE_ASN1_FUNCTIONS(PKCS7_ENCRYPT) DECLARE_ASN1_FUNCTIONS(PKCS7) +DECLARE_ASN1_ITEM(PKCS7_ATTR_SIGN) +DECLARE_ASN1_ITEM(PKCS7_ATTR_VERIFY) + void ERR_load_PKCS7_strings(void); -- 2.25.1