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https://github.com/openssl/openssl.git
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269 lines
8.2 KiB
C
269 lines
8.2 KiB
C
/*
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* Copyright 1999-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include <openssl/pkcs12.h>
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#include "crypto/x509.h" /* for ossl_x509_add_cert_new() */
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/* Simplified PKCS#12 routines */
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static int parse_pk12(PKCS12 *p12, const char *pass, int passlen,
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EVP_PKEY **pkey, STACK_OF(X509) *ocerts);
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static int parse_bags(const STACK_OF(PKCS12_SAFEBAG) *bags, const char *pass,
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int passlen, EVP_PKEY **pkey, STACK_OF(X509) *ocerts,
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OSSL_LIB_CTX *libctx, const char *propq);
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static int parse_bag(PKCS12_SAFEBAG *bag, const char *pass, int passlen,
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EVP_PKEY **pkey, STACK_OF(X509) *ocerts,
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OSSL_LIB_CTX *libctx, const char *propq);
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/*
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* Parse and decrypt a PKCS#12 structure returning user key, user cert and
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* other (CA) certs. Note either ca should be NULL, *ca should be NULL, or it
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* should point to a valid STACK structure. pkey and/or cert may be NULL;
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* if non-NULL the variables they point to can be passed uninitialised.
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*/
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int PKCS12_parse(PKCS12 *p12, const char *pass, EVP_PKEY **pkey, X509 **cert,
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STACK_OF(X509) **ca)
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{
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STACK_OF(X509) *ocerts = NULL;
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X509 *x = NULL;
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if (pkey != NULL)
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*pkey = NULL;
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if (cert != NULL)
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*cert = NULL;
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/* Check for NULL PKCS12 structure */
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if (p12 == NULL) {
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ERR_raise(ERR_LIB_PKCS12, PKCS12_R_INVALID_NULL_PKCS12_POINTER);
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return 0;
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}
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/* Check the mac */
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if (PKCS12_mac_present(p12)) {
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/*
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* If password is zero length or NULL then try verifying both cases to
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* determine which password is correct. The reason for this is that under
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* PKCS#12 password based encryption no password and a zero length
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* password are two different things...
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*/
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if (pass == NULL || *pass == '\0') {
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if (PKCS12_verify_mac(p12, NULL, 0))
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pass = NULL;
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else if (PKCS12_verify_mac(p12, "", 0))
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pass = "";
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else {
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ERR_raise(ERR_LIB_PKCS12, PKCS12_R_MAC_VERIFY_FAILURE);
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goto err;
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}
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} else if (!PKCS12_verify_mac(p12, pass, -1)) {
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ERR_raise(ERR_LIB_PKCS12, PKCS12_R_MAC_VERIFY_FAILURE);
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goto err;
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}
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} else if (pass == NULL || *pass == '\0') {
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pass = NULL;
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}
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/* If needed, allocate stack for other certificates */
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if ((cert != NULL || ca != NULL)
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&& (ocerts = sk_X509_new_null()) == NULL) {
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ERR_raise(ERR_LIB_PKCS12, ERR_R_CRYPTO_LIB);
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goto err;
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}
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if (!parse_pk12(p12, pass, -1, pkey, ocerts)) {
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int err = ERR_peek_last_error();
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if (ERR_GET_LIB(err) != ERR_LIB_EVP
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&& ERR_GET_REASON(err) != EVP_R_UNSUPPORTED_ALGORITHM)
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ERR_raise(ERR_LIB_PKCS12, PKCS12_R_PARSE_ERROR);
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goto err;
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}
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/* Split the certs in ocerts over *cert and *ca as far as requested */
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while ((x = sk_X509_shift(ocerts)) != NULL) {
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if (pkey != NULL && *pkey != NULL
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&& cert != NULL && *cert == NULL) {
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int match;
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ERR_set_mark();
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match = X509_check_private_key(x, *pkey);
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ERR_pop_to_mark();
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if (match) {
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*cert = x;
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continue;
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}
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}
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if (ca != NULL) {
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if (!ossl_x509_add_cert_new(ca, x, X509_ADD_FLAG_DEFAULT))
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goto err;
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continue;
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}
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X509_free(x);
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}
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sk_X509_free(ocerts);
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return 1;
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err:
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if (pkey != NULL) {
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EVP_PKEY_free(*pkey);
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*pkey = NULL;
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}
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if (cert != NULL) {
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X509_free(*cert);
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*cert = NULL;
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}
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X509_free(x);
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OSSL_STACK_OF_X509_free(ocerts);
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return 0;
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}
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/* Parse the outer PKCS#12 structure */
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/* pkey and/or ocerts may be NULL */
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static int parse_pk12(PKCS12 *p12, const char *pass, int passlen,
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EVP_PKEY **pkey, STACK_OF(X509) *ocerts)
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{
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STACK_OF(PKCS7) *asafes;
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STACK_OF(PKCS12_SAFEBAG) *bags;
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int i, bagnid;
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PKCS7 *p7;
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if ((asafes = PKCS12_unpack_authsafes(p12)) == NULL)
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return 0;
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for (i = 0; i < sk_PKCS7_num(asafes); i++) {
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p7 = sk_PKCS7_value(asafes, i);
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bagnid = OBJ_obj2nid(p7->type);
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if (bagnid == NID_pkcs7_data) {
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bags = PKCS12_unpack_p7data(p7);
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} else if (bagnid == NID_pkcs7_encrypted) {
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bags = PKCS12_unpack_p7encdata(p7, pass, passlen);
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} else
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continue;
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if (!bags) {
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sk_PKCS7_pop_free(asafes, PKCS7_free);
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return 0;
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}
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if (!parse_bags(bags, pass, passlen, pkey, ocerts,
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p7->ctx.libctx, p7->ctx.propq)) {
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sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free);
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sk_PKCS7_pop_free(asafes, PKCS7_free);
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return 0;
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}
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sk_PKCS12_SAFEBAG_pop_free(bags, PKCS12_SAFEBAG_free);
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}
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sk_PKCS7_pop_free(asafes, PKCS7_free);
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return 1;
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}
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/* pkey and/or ocerts may be NULL */
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static int parse_bags(const STACK_OF(PKCS12_SAFEBAG) *bags, const char *pass,
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int passlen, EVP_PKEY **pkey, STACK_OF(X509) *ocerts,
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OSSL_LIB_CTX *libctx, const char *propq)
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{
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int i;
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for (i = 0; i < sk_PKCS12_SAFEBAG_num(bags); i++) {
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if (!parse_bag(sk_PKCS12_SAFEBAG_value(bags, i),
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pass, passlen, pkey, ocerts,
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libctx, propq))
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return 0;
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}
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return 1;
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}
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/* pkey and/or ocerts may be NULL */
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static int parse_bag(PKCS12_SAFEBAG *bag, const char *pass, int passlen,
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EVP_PKEY **pkey, STACK_OF(X509) *ocerts,
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OSSL_LIB_CTX *libctx, const char *propq)
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{
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PKCS8_PRIV_KEY_INFO *p8;
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X509 *x509;
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const ASN1_TYPE *attrib;
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ASN1_BMPSTRING *fname = NULL;
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ASN1_OCTET_STRING *lkid = NULL;
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if ((attrib = PKCS12_SAFEBAG_get0_attr(bag, NID_friendlyName)))
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fname = attrib->value.bmpstring;
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if ((attrib = PKCS12_SAFEBAG_get0_attr(bag, NID_localKeyID)))
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lkid = attrib->value.octet_string;
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switch (PKCS12_SAFEBAG_get_nid(bag)) {
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case NID_keyBag:
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if (pkey == NULL || *pkey != NULL)
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return 1;
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*pkey = EVP_PKCS82PKEY_ex(PKCS12_SAFEBAG_get0_p8inf(bag),
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libctx, propq);
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if (*pkey == NULL)
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return 0;
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break;
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case NID_pkcs8ShroudedKeyBag:
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if (pkey == NULL || *pkey != NULL)
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return 1;
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if ((p8 = PKCS12_decrypt_skey_ex(bag, pass, passlen,
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libctx, propq)) == NULL)
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return 0;
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*pkey = EVP_PKCS82PKEY_ex(p8, libctx, propq);
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PKCS8_PRIV_KEY_INFO_free(p8);
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if (!(*pkey))
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return 0;
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break;
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case NID_certBag:
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if (ocerts == NULL
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|| PKCS12_SAFEBAG_get_bag_nid(bag) != NID_x509Certificate)
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return 1;
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if ((x509 = PKCS12_SAFEBAG_get1_cert_ex(bag, libctx, propq)) == NULL)
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return 0;
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if (lkid && !X509_keyid_set1(x509, lkid->data, lkid->length)) {
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X509_free(x509);
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return 0;
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}
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if (fname) {
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int len, r;
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unsigned char *data;
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len = ASN1_STRING_to_UTF8(&data, fname);
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if (len >= 0) {
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r = X509_alias_set1(x509, data, len);
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OPENSSL_free(data);
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if (!r) {
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X509_free(x509);
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return 0;
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}
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}
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}
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if (!sk_X509_push(ocerts, x509)) {
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X509_free(x509);
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return 0;
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}
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break;
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case NID_safeContentsBag:
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return parse_bags(PKCS12_SAFEBAG_get0_safes(bag), pass, passlen, pkey,
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ocerts, libctx, propq);
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default:
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return 1;
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}
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return 1;
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}
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