1 files changed, 394 insertions, 0 deletions

diff --git a/src/lib/libcrypto/cms/cms_pwri.c b/src/lib/libcrypto/cms/cms_pwri.c
new file mode 100644
index 0000000000..26e3bdcf9e
--- /dev/null
+++ b/src/lib/libcrypto/cms/cms_pwri.c
@@ -0,0 +1,394 @@
+/*
+ * Copyright 2009-2018 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include "internal/cryptlib.h"
+#include <openssl/asn1t.h>
+#include <openssl/pem.h>
+#include <openssl/x509v3.h>
+#include <openssl/err.h>
+#include <openssl/cms.h>
+#include <openssl/rand.h>
+#include <openssl/aes.h>
+#include "cms_lcl.h"
+#include "internal/asn1_int.h"
+
+int CMS_RecipientInfo_set0_password(CMS_RecipientInfo *ri,
+                                    unsigned char *pass, ossl_ssize_t passlen)
+{
+    CMS_PasswordRecipientInfo *pwri;
+    if (ri->type != CMS_RECIPINFO_PASS) {
+        CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_PASSWORD, CMS_R_NOT_PWRI);
+        return 0;
+    }
+
+    pwri = ri->d.pwri;
+    pwri->pass = pass;
+    if (pass && passlen < 0)
+        passlen = strlen((char *)pass);
+    pwri->passlen = passlen;
+    return 1;
+}
+
+CMS_RecipientInfo *CMS_add0_recipient_password(CMS_ContentInfo *cms,
+                                               int iter, int wrap_nid,
+                                               int pbe_nid,
+                                               unsigned char *pass,
+                                               ossl_ssize_t passlen,
+                                               const EVP_CIPHER *kekciph)
+{
+    CMS_RecipientInfo *ri = NULL;
+    CMS_EnvelopedData *env;
+    CMS_PasswordRecipientInfo *pwri;
+    EVP_CIPHER_CTX *ctx = NULL;
+    X509_ALGOR *encalg = NULL;
+    unsigned char iv[EVP_MAX_IV_LENGTH];
+    int ivlen;
+
+    env = cms_get0_enveloped(cms);
+    if (!env)
+        return NULL;
+
+    if (wrap_nid <= 0)
+        wrap_nid = NID_id_alg_PWRI_KEK;
+
+    if (pbe_nid <= 0)
+        pbe_nid = NID_id_pbkdf2;
+
+    /* Get from enveloped data */
+    if (kekciph == NULL)
+        kekciph = env->encryptedContentInfo->cipher;
+
+    if (kekciph == NULL) {
+        CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, CMS_R_NO_CIPHER);
+        return NULL;
+    }
+    if (wrap_nid != NID_id_alg_PWRI_KEK) {
+        CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
+               CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM);
+        return NULL;
+    }
+
+    /* Setup algorithm identifier for cipher */
+    encalg = X509_ALGOR_new();
+    if (encalg == NULL) {
+        goto merr;
+    }
+    ctx = EVP_CIPHER_CTX_new();
+
+    if (EVP_EncryptInit_ex(ctx, kekciph, NULL, NULL, NULL) <= 0) {
+        CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_EVP_LIB);
+        goto err;
+    }
+
+    ivlen = EVP_CIPHER_CTX_iv_length(ctx);
+
+    if (ivlen > 0) {
+        if (RAND_bytes(iv, ivlen) <= 0)
+            goto err;
+        if (EVP_EncryptInit_ex(ctx, NULL, NULL, NULL, iv) <= 0) {
+            CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_EVP_LIB);
+            goto err;
+        }
+        encalg->parameter = ASN1_TYPE_new();
+        if (!encalg->parameter) {
+            CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_MALLOC_FAILURE);
+            goto err;
+        }
+        if (EVP_CIPHER_param_to_asn1(ctx, encalg->parameter) <= 0) {
+            CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD,
+                   CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
+            goto err;
+        }
+    }
+
+    encalg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
+
+    EVP_CIPHER_CTX_free(ctx);
+    ctx = NULL;
+
+    /* Initialize recipient info */
+    ri = M_ASN1_new_of(CMS_RecipientInfo);
+    if (ri == NULL)
+        goto merr;
+
+    ri->d.pwri = M_ASN1_new_of(CMS_PasswordRecipientInfo);
+    if (ri->d.pwri == NULL)
+        goto merr;
+    ri->type = CMS_RECIPINFO_PASS;
+
+    pwri = ri->d.pwri;
+    /* Since this is overwritten, free up empty structure already there */
+    X509_ALGOR_free(pwri->keyEncryptionAlgorithm);
+    pwri->keyEncryptionAlgorithm = X509_ALGOR_new();
+    if (pwri->keyEncryptionAlgorithm == NULL)
+        goto merr;
+    pwri->keyEncryptionAlgorithm->algorithm = OBJ_nid2obj(wrap_nid);
+    pwri->keyEncryptionAlgorithm->parameter = ASN1_TYPE_new();
+    if (pwri->keyEncryptionAlgorithm->parameter == NULL)
+        goto merr;
+
+    if (!ASN1_item_pack(encalg, ASN1_ITEM_rptr(X509_ALGOR),
+                        &pwri->keyEncryptionAlgorithm->parameter->
+                        value.sequence))
+         goto merr;
+    pwri->keyEncryptionAlgorithm->parameter->type = V_ASN1_SEQUENCE;
+
+    X509_ALGOR_free(encalg);
+    encalg = NULL;
+
+    /* Setup PBE algorithm */
+
+    pwri->keyDerivationAlgorithm = PKCS5_pbkdf2_set(iter, NULL, 0, -1, -1);
+
+    if (!pwri->keyDerivationAlgorithm)
+        goto err;
+
+    CMS_RecipientInfo_set0_password(ri, pass, passlen);
+    pwri->version = 0;
+
+    if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
+        goto merr;
+
+    return ri;
+
+ merr:
+    CMSerr(CMS_F_CMS_ADD0_RECIPIENT_PASSWORD, ERR_R_MALLOC_FAILURE);
+ err:
+    EVP_CIPHER_CTX_free(ctx);
+    if (ri)
+        M_ASN1_free_of(ri, CMS_RecipientInfo);
+    X509_ALGOR_free(encalg);
+    return NULL;
+
+}
+
+/*
+ * This is an implementation of the key wrapping mechanism in RFC3211, at
+ * some point this should go into EVP.
+ */
+
+static int kek_unwrap_key(unsigned char *out, size_t *outlen,
+                          const unsigned char *in, size_t inlen,
+                          EVP_CIPHER_CTX *ctx)
+{
+    size_t blocklen = EVP_CIPHER_CTX_block_size(ctx);
+    unsigned char *tmp;
+    int outl, rv = 0;
+    if (inlen < 2 * blocklen) {
+        /* too small */
+        return 0;
+    }
+    if (inlen % blocklen) {
+        /* Invalid size */
+        return 0;
+    }
+    if ((tmp = OPENSSL_malloc(inlen)) == NULL) {
+        CMSerr(CMS_F_KEK_UNWRAP_KEY, ERR_R_MALLOC_FAILURE);
+        return 0;
+    }
+    /* setup IV by decrypting last two blocks */
+    if (!EVP_DecryptUpdate(ctx, tmp + inlen - 2 * blocklen, &outl,
+                           in + inlen - 2 * blocklen, blocklen * 2)
+        /*
+         * Do a decrypt of last decrypted block to set IV to correct value
+         * output it to start of buffer so we don't corrupt decrypted block
+         * this works because buffer is at least two block lengths long.
+         */
+        || !EVP_DecryptUpdate(ctx, tmp, &outl,
+                              tmp + inlen - blocklen, blocklen)
+        /* Can now decrypt first n - 1 blocks */
+        || !EVP_DecryptUpdate(ctx, tmp, &outl, in, inlen - blocklen)
+
+        /* Reset IV to original value */
+        || !EVP_DecryptInit_ex(ctx, NULL, NULL, NULL, NULL)
+        /* Decrypt again */
+        || !EVP_DecryptUpdate(ctx, tmp, &outl, tmp, inlen))
+        goto err;
+    /* Check check bytes */
+    if (((tmp[1] ^ tmp[4]) & (tmp[2] ^ tmp[5]) & (tmp[3] ^ tmp[6])) != 0xff) {
+        /* Check byte failure */
+        goto err;
+    }
+    if (inlen < (size_t)(tmp[0] - 4)) {
+        /* Invalid length value */
+        goto err;
+    }
+    *outlen = (size_t)tmp[0];
+    memcpy(out, tmp + 4, *outlen);
+    rv = 1;
+ err:
+    OPENSSL_clear_free(tmp, inlen);
+    return rv;
+
+}
+
+static int kek_wrap_key(unsigned char *out, size_t *outlen,
+                        const unsigned char *in, size_t inlen,
+                        EVP_CIPHER_CTX *ctx)
+{
+    size_t blocklen = EVP_CIPHER_CTX_block_size(ctx);
+    size_t olen;
+    int dummy;
+    /*
+     * First decide length of output buffer: need header and round up to
+     * multiple of block length.
+     */
+    olen = (inlen + 4 + blocklen - 1) / blocklen;
+    olen *= blocklen;
+    if (olen < 2 * blocklen) {
+        /* Key too small */
+        return 0;
+    }
+    if (inlen > 0xFF) {
+        /* Key too large */
+        return 0;
+    }
+    if (out) {
+        /* Set header */
+        out[0] = (unsigned char)inlen;
+        out[1] = in[0] ^ 0xFF;
+        out[2] = in[1] ^ 0xFF;
+        out[3] = in[2] ^ 0xFF;
+        memcpy(out + 4, in, inlen);
+        /* Add random padding to end */
+        if (olen > inlen + 4
+            && RAND_bytes(out + 4 + inlen, olen - 4 - inlen) <= 0)
+            return 0;
+        /* Encrypt twice */
+        if (!EVP_EncryptUpdate(ctx, out, &dummy, out, olen)
+            || !EVP_EncryptUpdate(ctx, out, &dummy, out, olen))
+            return 0;
+    }
+
+    *outlen = olen;
+
+    return 1;
+}
+
+/* Encrypt/Decrypt content key in PWRI recipient info */
+
+int cms_RecipientInfo_pwri_crypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri,
+                                 int en_de)
+{
+    CMS_EncryptedContentInfo *ec;
+    CMS_PasswordRecipientInfo *pwri;
+    int r = 0;
+    X509_ALGOR *algtmp, *kekalg = NULL;
+    EVP_CIPHER_CTX *kekctx = NULL;
+    const EVP_CIPHER *kekcipher;
+    unsigned char *key = NULL;
+    size_t keylen;
+
+    ec = cms->d.envelopedData->encryptedContentInfo;
+
+    pwri = ri->d.pwri;
+
+    if (!pwri->pass) {
+        CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_NO_PASSWORD);
+        return 0;
+    }
+    algtmp = pwri->keyEncryptionAlgorithm;
+
+    if (!algtmp || OBJ_obj2nid(algtmp->algorithm) != NID_id_alg_PWRI_KEK) {
+        CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
+               CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM);
+        return 0;
+    }
+
+    kekalg = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(X509_ALGOR),
+                                       algtmp->parameter);
+
+    if (kekalg == NULL) {
+        CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
+               CMS_R_INVALID_KEY_ENCRYPTION_PARAMETER);
+        return 0;
+    }
+
+    kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
+
+    if (!kekcipher) {
+        CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_UNKNOWN_CIPHER);
+        return 0;
+    }
+
+    kekctx = EVP_CIPHER_CTX_new();
+    if (kekctx == NULL) {
+        CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, ERR_R_MALLOC_FAILURE);
+        return 0;
+    }
+    /* Fixup cipher based on AlgorithmIdentifier to set IV etc */
+    if (!EVP_CipherInit_ex(kekctx, kekcipher, NULL, NULL, NULL, en_de))
+        goto err;
+    EVP_CIPHER_CTX_set_padding(kekctx, 0);
+    if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0) {
+        CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
+               CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
+        goto err;
+    }
+
+    algtmp = pwri->keyDerivationAlgorithm;
+
+    /* Finish password based key derivation to setup key in "ctx" */
+
+    if (EVP_PBE_CipherInit(algtmp->algorithm,
+                           (char *)pwri->pass, pwri->passlen,
+                           algtmp->parameter, kekctx, en_de) < 0) {
+        CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, ERR_R_EVP_LIB);
+        goto err;
+    }
+
+    /* Finally wrap/unwrap the key */
+
+    if (en_de) {
+
+        if (!kek_wrap_key(NULL, &keylen, ec->key, ec->keylen, kekctx))
+            goto err;
+
+        key = OPENSSL_malloc(keylen);
+
+        if (key == NULL)
+            goto err;
+
+        if (!kek_wrap_key(key, &keylen, ec->key, ec->keylen, kekctx))
+            goto err;
+        pwri->encryptedKey->data = key;
+        pwri->encryptedKey->length = keylen;
+    } else {
+        key = OPENSSL_malloc(pwri->encryptedKey->length);
+
+        if (key == NULL) {
+            CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, ERR_R_MALLOC_FAILURE);
+            goto err;
+        }
+        if (!kek_unwrap_key(key, &keylen,
+                            pwri->encryptedKey->data,
+                            pwri->encryptedKey->length, kekctx)) {
+            CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_UNWRAP_FAILURE);
+            goto err;
+        }
+
+        OPENSSL_clear_free(ec->key, ec->keylen);
+        ec->key = key;
+        ec->keylen = keylen;
+
+    }
+
+    r = 1;
+
+ err:
+
+    EVP_CIPHER_CTX_free(kekctx);
+
+    if (!r)
+        OPENSSL_free(key);
+    X509_ALGOR_free(kekalg);
+
+    return r;
+
+}