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openssl/crypto/pkcs7/pk7_smime.c

 /* pk7_smime.c */
 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
  * project.
  */
 /* ====================================================================
  * Copyright (c) 1999-2004 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:
@@ skipping 45 matching lines @@
  *
  */
 
 /* Simple PKCS#7 processing functions */
 
 #include <stdio.h>
 #include "cryptlib.h"
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 
+static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si);
+
 PKCS7 *PKCS7_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
                   BIO *data, int flags)
 {
-        PKCS7 *p7 = NULL;
-        PKCS7_SIGNER_INFO *si;
-        BIO *p7bio = NULL;
-        STACK_OF(X509_ALGOR) *smcap = NULL;
+        PKCS7 *p7;
         int i;
 
-        if(!X509_check_private_key(signcert, pkey)) {
-                PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
-                return NULL;
-        }
-
-        if(!(p7 = PKCS7_new())) {
+        if(!(p7 = PKCS7_new()))
+                {
                 PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
                 return NULL;
-        }
+                }
 
         if (!PKCS7_set_type(p7, NID_pkcs7_signed))
                 goto err;
 
         if (!PKCS7_content_new(p7, NID_pkcs7_data))
                 goto err;
 
-        if (!(si = PKCS7_add_signature(p7,signcert,pkey,EVP_sha1()))) {
-                PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
+        if (pkey && !PKCS7_sign_add_signer(p7, signcert, pkey, NULL, flags))
+                {
+                PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_ADD_SIGNER_ERROR);
                 goto err;
-        }
+                }
 
-        if(!(flags & PKCS7_NOCERTS)) {
-                if (!PKCS7_add_certificate(p7, signcert))
-                        goto err;
-                if(certs) for(i = 0; i < sk_X509_num(certs); i++)
+        if(!(flags & PKCS7_NOCERTS))
+                {
+                for(i = 0; i < sk_X509_num(certs); i++)
+                        {
                         if (!PKCS7_add_certificate(p7, sk_X509_value(certs, i)))
                                 goto err;
-        }
+                        }
+                }
 
-        if(!(flags & PKCS7_NOATTR)) {
-                if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
-                                V_ASN1_OBJECT, OBJ_nid2obj(NID_pkcs7_data)))
-                        goto err;
-                /* Add SMIMECapabilities */
-                if(!(flags & PKCS7_NOSMIMECAP))
-                {
-                if(!(smcap = sk_X509_ALGOR_new_null())) {
-                        PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
-                        goto err;
-                }
-#ifndef OPENSSL_NO_DES
-                if (!PKCS7_simple_smimecap (smcap, NID_des_ede3_cbc, -1))
-                        goto err;
-#endif
-#ifndef OPENSSL_NO_RC2
-                if (!PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 128))
-                        goto err;
-                if (!PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 64))
-                        goto err;
-#endif
-#ifndef OPENSSL_NO_DES
-                if (!PKCS7_simple_smimecap (smcap, NID_des_cbc, -1))
-                        goto err;
-#endif
-#ifndef OPENSSL_NO_RC2
-                if (!PKCS7_simple_smimecap (smcap, NID_rc2_cbc, 40))
-                        goto err;
-#endif
-                if (!PKCS7_add_attrib_smimecap (si, smcap))
-                        goto err;
-                sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
-                smcap = NULL;
-                }
-        }
+        if(flags & PKCS7_DETACHED)
+                PKCS7_set_detached(p7, 1);
 
-        if(flags & PKCS7_DETACHED)PKCS7_set_detached(p7, 1);
-
-        if (flags & PKCS7_STREAM)
+        if (flags & (PKCS7_STREAM|PKCS7_PARTIAL))
                 return p7;
 
+        if (PKCS7_final(p7, data, flags))
+                return p7;
 
-        if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
-                PKCS7err(PKCS7_F_PKCS7_SIGN,ERR_R_MALLOC_FAILURE);
-                goto err;
-        }
-
-        SMIME_crlf_copy(data, p7bio, flags);
-
-
-        if (!PKCS7_dataFinal(p7,p7bio)) {
-                PKCS7err(PKCS7_F_PKCS7_SIGN,PKCS7_R_PKCS7_DATASIGN);
-                goto err;
-        }
-
-        BIO_free_all(p7bio);
-        return p7;
-err:
-        sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
-        BIO_free_all(p7bio);
+        err:
         PKCS7_free(p7);
         return NULL;
 }
 
+int PKCS7_final(PKCS7 *p7, BIO *data, int flags)
+        {
+        BIO *p7bio;
+        int ret = 0;
+        if (!(p7bio = PKCS7_dataInit(p7, NULL)))
+                {
+                PKCS7err(PKCS7_F_PKCS7_FINAL,ERR_R_MALLOC_FAILURE);
+                return 0;
+                }
+
+        SMIME_crlf_copy(data, p7bio, flags);
+
+        (void)BIO_flush(p7bio);
+
+
+        if (!PKCS7_dataFinal(p7,p7bio))
+                {
+                PKCS7err(PKCS7_F_PKCS7_FINAL,PKCS7_R_PKCS7_DATASIGN);
+                goto err;
+                }
+
+        ret = 1;
+
+        err:
+        BIO_free_all(p7bio);
+
+        return ret;
+
+        }
+
+/* Check to see if a cipher exists and if so add S/MIME capabilities */
+
+static int add_cipher_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
+        {
+        if (EVP_get_cipherbynid(nid))
+                return PKCS7_simple_smimecap(sk, nid, arg);
+        return 1;
+        }
+
+static int add_digest_smcap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
+        {
+        if (EVP_get_digestbynid(nid))
+                return PKCS7_simple_smimecap(sk, nid, arg);
+        return 1;
+        }
+
+PKCS7_SIGNER_INFO *PKCS7_sign_add_signer(PKCS7 *p7, X509 *signcert,
+                                        EVP_PKEY *pkey, const EVP_MD *md,
+                                        int flags)
+        {
+        PKCS7_SIGNER_INFO *si = NULL;
+        STACK_OF(X509_ALGOR) *smcap = NULL;
+        if(!X509_check_private_key(signcert, pkey))
+                {
+                PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
+                        PKCS7_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
+                return NULL;
+                }
+
+        if (!(si = PKCS7_add_signature(p7,signcert,pkey, md)))
+                {
+                PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
+                                PKCS7_R_PKCS7_ADD_SIGNATURE_ERROR);
+                return NULL;
+                }
+
+        if(!(flags & PKCS7_NOCERTS))
+                {
+                if (!PKCS7_add_certificate(p7, signcert))
+                        goto err;
+                }
+
+        if(!(flags & PKCS7_NOATTR))
+                {
+                if (!PKCS7_add_attrib_content_type(si, NULL))
+                        goto err;
+                /* Add SMIMECapabilities */
+                if(!(flags & PKCS7_NOSMIMECAP))
+                        {
+                        if(!(smcap = sk_X509_ALGOR_new_null()))
+                                {
+                                PKCS7err(PKCS7_F_PKCS7_SIGN_ADD_SIGNER,
+                                        ERR_R_MALLOC_FAILURE);
+                                goto err;
+                                }
+                        if (!add_cipher_smcap(smcap, NID_aes_256_cbc, -1)
+                        || !add_digest_smcap(smcap, NID_id_GostR3411_94, -1)
+                        || !add_cipher_smcap(smcap, NID_id_Gost28147_89, -1)
+                                || !add_cipher_smcap(smcap, NID_aes_192_cbc, -1)
+                                || !add_cipher_smcap(smcap, NID_aes_128_cbc, -1)
+                        || !add_cipher_smcap(smcap, NID_des_ede3_cbc, -1)
+                                || !add_cipher_smcap(smcap, NID_rc2_cbc, 128)
+                                || !add_cipher_smcap(smcap, NID_rc2_cbc, 64)
+                                || !add_cipher_smcap(smcap, NID_des_cbc, -1)
+                                || !add_cipher_smcap(smcap, NID_rc2_cbc, 40)
+                                || !PKCS7_add_attrib_smimecap (si, smcap))
+                                goto err;
+                        sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
+                        smcap = NULL;
+                        }
+                if (flags & PKCS7_REUSE_DIGEST)
+                        {
+                        if (!pkcs7_copy_existing_digest(p7, si))
+                                goto err;
+                        if (!(flags & PKCS7_PARTIAL) &&
+                                        !PKCS7_SIGNER_INFO_sign(si))
+                                goto err;
+                        }
+                }
+        return si;
+        err:
+        if (smcap)
+                sk_X509_ALGOR_pop_free(smcap, X509_ALGOR_free);
+        return NULL;
+        }
+
+/* Search for a digest matching SignerInfo digest type and if found
+ * copy across.
+ */
+
+static int pkcs7_copy_existing_digest(PKCS7 *p7, PKCS7_SIGNER_INFO *si)
+        {
+        int i;
+        STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
+        PKCS7_SIGNER_INFO *sitmp;
+        ASN1_OCTET_STRING *osdig = NULL;
+        sinfos = PKCS7_get_signer_info(p7);
+        for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
+                {
+                sitmp = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
+                if (si == sitmp)
+                        break;
+                if (sk_X509_ATTRIBUTE_num(sitmp->auth_attr) <= 0)
+                        continue;
+                if (!OBJ_cmp(si->digest_alg->algorithm,
+                                sitmp->digest_alg->algorithm))
+                        {
+                        osdig = PKCS7_digest_from_attributes(sitmp->auth_attr);
+                        break;
+                        }
+
+                }
+
+        if (osdig)
+                return PKCS7_add1_attrib_digest(si, osdig->data, osdig->length);
+
+        PKCS7err(PKCS7_F_PKCS7_COPY_EXISTING_DIGEST,
+                        PKCS7_R_NO_MATCHING_DIGEST_TYPE_FOUND);
+        return 0;
+        }
+
 int PKCS7_verify(PKCS7 *p7, STACK_OF(X509) *certs, X509_STORE *store,
                                         BIO *indata, BIO *out, int flags)
 {
         STACK_OF(X509) *signers;
         X509 *signer;
         STACK_OF(PKCS7_SIGNER_INFO) *sinfos;
         PKCS7_SIGNER_INFO *si;
         X509_STORE_CTX cert_ctx;
         char buf[4096];
         int i, j=0, k, ret = 0;
@@ skipping 169 matching lines @@
                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_WRONG_CONTENT_TYPE);
                 return NULL;
         }
 
         /* Collect all the signers together */
 
         sinfos = PKCS7_get_signer_info(p7);
 
         if(sk_PKCS7_SIGNER_INFO_num(sinfos) <= 0) {
                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_NO_SIGNERS);
-                return NULL;
+                return 0;
         }
 
         if(!(signers = sk_X509_new_null())) {
                 PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,ERR_R_MALLOC_FAILURE);
                 return NULL;
         }
 
         for (i = 0; i < sk_PKCS7_SIGNER_INFO_num(sinfos); i++)
         {
             si = sk_PKCS7_SIGNER_INFO_value(sinfos, i);
             ias = si->issuer_and_serial;
             signer = NULL;
                 /* If any certificates passed they take priority */
             if (certs) signer = X509_find_by_issuer_and_serial (certs,
                                                 ias->issuer, ias->serial);
             if (!signer && !(flags & PKCS7_NOINTERN)
                         && p7->d.sign->cert) signer =
                               X509_find_by_issuer_and_serial (p7->d.sign->cert,
                                                 ias->issuer, ias->serial);
             if (!signer) {
                         PKCS7err(PKCS7_F_PKCS7_GET0_SIGNERS,PKCS7_R_SIGNER_CERTIFICATE_NOT_FOUND);
                         sk_X509_free(signers);
-                        return NULL;
+                        return 0;
             }
 
             if (!sk_X509_push(signers, signer)) {
-                        sk_X509_free(signers);
-                        return NULL;
+                sk_X509_free(signers);
+                return NULL;
             }
         }
         return signers;
 }
 
 
 /* Build a complete PKCS#7 enveloped data */
 
 PKCS7 *PKCS7_encrypt(STACK_OF(X509) *certs, BIO *in, const EVP_CIPHER *cipher,
                                                                 int flags)
 {
         PKCS7 *p7;
         BIO *p7bio = NULL;
         int i;
         X509 *x509;
         if(!(p7 = PKCS7_new())) {
                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
                 return NULL;
         }
 
         if (!PKCS7_set_type(p7, NID_pkcs7_enveloped))
                 goto err;
-        if(!PKCS7_set_cipher(p7, cipher)) {
+        if (!PKCS7_set_cipher(p7, cipher)) {
                 PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_ERROR_SETTING_CIPHER);
                 goto err;
         }
 
         for(i = 0; i < sk_X509_num(certs); i++) {
                 x509 = sk_X509_value(certs, i);
                 if(!PKCS7_add_recipient(p7, x509)) {
                         PKCS7err(PKCS7_F_PKCS7_ENCRYPT,
                                         PKCS7_R_ERROR_ADDING_RECIPIENT);
                         goto err;
                 }
         }
 
-        if(!(p7bio = PKCS7_dataInit(p7, NULL))) {
-                PKCS7err(PKCS7_F_PKCS7_ENCRYPT,ERR_R_MALLOC_FAILURE);
-                goto err;
-        }
+        if (flags & PKCS7_STREAM)
+                return p7;
 
-        SMIME_crlf_copy(in, p7bio, flags);
-
-        (void)BIO_flush(p7bio);
-
-        if (!PKCS7_dataFinal(p7,p7bio)) {
-                PKCS7err(PKCS7_F_PKCS7_ENCRYPT,PKCS7_R_PKCS7_DATAFINAL_ERROR);
-                goto err;
-        }
-        BIO_free_all(p7bio);
-
-        return p7;
+        if (PKCS7_final(p7, in, flags))
+                return p7;
 
         err:
 
         BIO_free_all(p7bio);
         PKCS7_free(p7);
         return NULL;
 
 }
 
 int PKCS7_decrypt(PKCS7 *p7, EVP_PKEY *pkey, X509 *cert, BIO *data, int flags)
@@ skipping 43 matching lines @@
         } else {
                 for(;;) {
                         i = BIO_read(tmpmem, buf, sizeof(buf));
                         if(i <= 0) break;
                         BIO_write(data, buf, i);
                 }
                 BIO_free_all(tmpmem);
                 return 1;
         }
 }