[thirdparty/openssl.git] / providers / implementations / encode_decode / decode_msblob2key.c

/*
 * Copyright 2020-2022 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (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
 */

/*
 * low level APIs are deprecated for public use, but still ok for
 * internal use.
 */
#include "internal/deprecated.h"

#include <string.h>

#include <openssl/core_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/core_object.h>
#include <openssl/crypto.h>
#include <openssl/params.h>
#include <openssl/pem.h>         /* For public PVK functions */
#include <openssl/x509.h>
#include <openssl/err.h>
#include "internal/passphrase.h"
#include "crypto/pem.h"          /* For internal PVK and "blob" headers */
#include "crypto/rsa.h"
#include "prov/bio.h"
#include "prov/implementations.h"
#include "endecoder_local.h"

struct msblob2key_ctx_st;            /* Forward declaration */
typedef void *b2i_of_void_fn(const unsigned char **in, unsigned int bitlen,
                             int ispub);
typedef void adjust_key_fn(void *, struct msblob2key_ctx_st *ctx);
typedef void free_key_fn(void *);
struct keytype_desc_st {
    int type;                 /* EVP key type */
    const char *name;         /* Keytype */
    const OSSL_DISPATCH *fns; /* Keymgmt (to pilfer functions from) */

    b2i_of_void_fn *read_private_key;
    b2i_of_void_fn *read_public_key;
    adjust_key_fn *adjust_key;
    free_key_fn *free_key;
};

static OSSL_FUNC_decoder_freectx_fn msblob2key_freectx;
static OSSL_FUNC_decoder_decode_fn msblob2key_decode;
static OSSL_FUNC_decoder_export_object_fn msblob2key_export_object;

/*
 * Context used for DER to key decoding.
 */
struct msblob2key_ctx_st {
    PROV_CTX *provctx;
    const struct keytype_desc_st *desc;
    /* The selection that is passed to msblob2key_decode() */
    int selection;
};

static struct msblob2key_ctx_st *
msblob2key_newctx(void *provctx, const struct keytype_desc_st *desc)
{
    struct msblob2key_ctx_st *ctx = OPENSSL_zalloc(sizeof(*ctx));

    if (ctx != NULL) {
        ctx->provctx = provctx;
        ctx->desc = desc;
    }
    return ctx;
}

static void msblob2key_freectx(void *vctx)
{
    struct msblob2key_ctx_st *ctx = vctx;

    OPENSSL_free(ctx);
}

static int msblob2key_decode(void *vctx, OSSL_CORE_BIO *cin, int selection,
                             OSSL_CALLBACK *data_cb, void *data_cbarg,
                             OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
{
    struct msblob2key_ctx_st *ctx = vctx;
    BIO *in = ossl_bio_new_from_core_bio(ctx->provctx, cin);
    const unsigned char *p;
    unsigned char hdr_buf[16], *buf = NULL;
    unsigned int bitlen, magic, length;
    int isdss = -1;
    int ispub = -1;
    void *key = NULL;
    int ok = 0;

    if (in == NULL)
        return 0;

    if (BIO_read(in, hdr_buf, 16) != 16) {
        ERR_raise(ERR_LIB_PEM, PEM_R_KEYBLOB_TOO_SHORT);
        goto next;
    }
    ERR_set_mark();
    p = hdr_buf;
    ok = ossl_do_blob_header(&p, 16, &magic, &bitlen, &isdss, &ispub) > 0;
    ERR_pop_to_mark();
    if (!ok)
        goto next;

    ctx->selection = selection;
    ok = 0;                      /* Assume that we fail */

    if ((isdss && ctx->desc->type != EVP_PKEY_DSA)
        || (!isdss && ctx->desc->type != EVP_PKEY_RSA))
        goto next;

    length = ossl_blob_length(bitlen, isdss, ispub);
    if (length > BLOB_MAX_LENGTH) {
        ERR_raise(ERR_LIB_PEM, PEM_R_HEADER_TOO_LONG);
        goto next;
    }
    buf = OPENSSL_malloc(length);
    if (buf == NULL)
        goto end;
    p = buf;
    if (BIO_read(in, buf, length) != (int)length) {
        ERR_raise(ERR_LIB_PEM, PEM_R_KEYBLOB_TOO_SHORT);
        goto next;
    }

    if ((selection == 0
         || (selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
        && !ispub
        && ctx->desc->read_private_key != NULL) {
        struct ossl_passphrase_data_st pwdata;

        memset(&pwdata, 0, sizeof(pwdata));
        if (!ossl_pw_set_ossl_passphrase_cb(&pwdata, pw_cb, pw_cbarg))
            goto end;
        p = buf;
        key = ctx->desc->read_private_key(&p, bitlen, ispub);
        if (selection != 0 && key == NULL)
            goto next;
    }
    if (key == NULL && (selection == 0
         || (selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
        && ispub
        && ctx->desc->read_public_key != NULL) {
        p = buf;
        key = ctx->desc->read_public_key(&p, bitlen, ispub);
        if (selection != 0 && key == NULL)
            goto next;
    }

    if (key != NULL && ctx->desc->adjust_key != NULL)
        ctx->desc->adjust_key(key, ctx);

 next:
    /*
     * Indicated that we successfully decoded something, or not at all.
     * Ending up "empty handed" is not an error.
     */
    ok = 1;

    /*
     * We free resources here so it's not held up during the callback, because
     * we know the process is recursive and the allocated chunks of memory
     * add up.
     */
    OPENSSL_free(buf);
    BIO_free(in);
    buf = NULL;
    in = NULL;

    if (key != NULL) {
        OSSL_PARAM params[4];
        int object_type = OSSL_OBJECT_PKEY;

        params[0] =
            OSSL_PARAM_construct_int(OSSL_OBJECT_PARAM_TYPE, &object_type);
        params[1] =
            OSSL_PARAM_construct_utf8_string(OSSL_OBJECT_PARAM_DATA_TYPE,
                                             (char *)ctx->desc->name, 0);
        /* The address of the key becomes the octet string */
        params[2] =
            OSSL_PARAM_construct_octet_string(OSSL_OBJECT_PARAM_REFERENCE,
                                              &key, sizeof(key));
        params[3] = OSSL_PARAM_construct_end();

        ok = data_cb(params, data_cbarg);
    }

 end:
    BIO_free(in);
    OPENSSL_free(buf);
    ctx->desc->free_key(key);

    return ok;
}

static int
msblob2key_export_object(void *vctx,
                         const void *reference, size_t reference_sz,
                         OSSL_CALLBACK *export_cb, void *export_cbarg)
{
    struct msblob2key_ctx_st *ctx = vctx;
    OSSL_FUNC_keymgmt_export_fn *export =
        ossl_prov_get_keymgmt_export(ctx->desc->fns);
    void *keydata;

    if (reference_sz == sizeof(keydata) && export != NULL) {
        /* The contents of the reference is the address to our object */
        keydata = *(void **)reference;

        return export(keydata, ctx->selection, export_cb, export_cbarg);
    }
    return 0;
}

/* ---------------------------------------------------------------------- */

#define dsa_decode_private_key  (b2i_of_void_fn *)ossl_b2i_DSA_after_header
#define dsa_decode_public_key   (b2i_of_void_fn *)ossl_b2i_DSA_after_header
#define dsa_adjust              NULL
#define dsa_free                (void (*)(void *))DSA_free

/* ---------------------------------------------------------------------- */

#define rsa_decode_private_key  (b2i_of_void_fn *)ossl_b2i_RSA_after_header
#define rsa_decode_public_key   (b2i_of_void_fn *)ossl_b2i_RSA_after_header

static void rsa_adjust(void *key, struct msblob2key_ctx_st *ctx)
{
    ossl_rsa_set0_libctx(key, PROV_LIBCTX_OF(ctx->provctx));
}

#define rsa_free                        (void (*)(void *))RSA_free

/* ---------------------------------------------------------------------- */

#define IMPLEMENT_MSBLOB(KEYTYPE, keytype)                              \
    static const struct keytype_desc_st mstype##2##keytype##_desc = {   \
        EVP_PKEY_##KEYTYPE, #KEYTYPE,                                   \
        ossl_##keytype##_keymgmt_functions,                             \
        keytype##_decode_private_key,                                   \
        keytype##_decode_public_key,                                    \
        keytype##_adjust,                                               \
        keytype##_free                                                  \
    };                                                                  \
    static OSSL_FUNC_decoder_newctx_fn msblob2##keytype##_newctx;       \
    static void *msblob2##keytype##_newctx(void *provctx)               \
    {                                                                   \
        return msblob2key_newctx(provctx, &mstype##2##keytype##_desc);  \
    }                                                                   \
    const OSSL_DISPATCH                                                 \
    ossl_msblob_to_##keytype##_decoder_functions[] = {                  \
        { OSSL_FUNC_DECODER_NEWCTX,                                     \
          (void (*)(void))msblob2##keytype##_newctx },                  \
        { OSSL_FUNC_DECODER_FREECTX,                                    \
          (void (*)(void))msblob2key_freectx },                         \
        { OSSL_FUNC_DECODER_DECODE,                                     \
          (void (*)(void))msblob2key_decode },                          \
        { OSSL_FUNC_DECODER_EXPORT_OBJECT,                              \
          (void (*)(void))msblob2key_export_object },                   \
        { 0, NULL }                                                     \
    }

#ifndef OPENSSL_NO_DSA
IMPLEMENT_MSBLOB(DSA, dsa);
#endif
IMPLEMENT_MSBLOB(RSA, rsa);
Commit	Line	Data
f4e46b81	1	/*
fecb3aae	2	* Copyright 2020-2022 The OpenSSL Project Authors. All Rights Reserved.
f4e46b81 RL	3	*
	4	* Licensed under the Apache License 2.0 (the "License"). You may not use
	5	* this file except in compliance with the License. You can obtain a copy
	6	* in the file LICENSE in the source distribution or at
	7	* https://www.openssl.org/source/license.html
	8	*/
	9
	10	/*
	11	* low level APIs are deprecated for public use, but still ok for
	12	* internal use.
	13	*/
	14	#include "internal/deprecated.h"
	15
	16	#include <string.h>
	17
	18	#include <openssl/core_dispatch.h>
	19	#include <openssl/core_names.h>
	20	#include <openssl/core_object.h>
	21	#include <openssl/crypto.h>
	22	#include <openssl/params.h>
	23	#include <openssl/pem.h> /* For public PVK functions */
	24	#include <openssl/x509.h>
	25	#include <openssl/err.h>
	26	#include "internal/passphrase.h"
	27	#include "crypto/pem.h" /* For internal PVK and "blob" headers */
	28	#include "crypto/rsa.h"
	29	#include "prov/bio.h"
	30	#include "prov/implementations.h"
	31	#include "endecoder_local.h"
	32
	33	struct msblob2key_ctx_st; /* Forward declaration */
	34	typedef void b2i_of_void_fn(const unsigned char *in, unsigned int bitlen,
	35	int ispub);
	36	typedef void adjust_key_fn(void , struct msblob2key_ctx_st ctx);
	37	typedef void free_key_fn(void *);
	38	struct keytype_desc_st {
	39	int type; /* EVP key type */
	40	const char name; / Keytype */
	41	const OSSL_DISPATCH fns; / Keymgmt (to pilfer functions from) */
	42
	43	b2i_of_void_fn *read_private_key;
	44	b2i_of_void_fn *read_public_key;
	45	adjust_key_fn *adjust_key;
	46	free_key_fn *free_key;
	47	};
	48
	49	static OSSL_FUNC_decoder_freectx_fn msblob2key_freectx;
f4e46b81 RL	50	static OSSL_FUNC_decoder_decode_fn msblob2key_decode;
	51	static OSSL_FUNC_decoder_export_object_fn msblob2key_export_object;
	52
	53	/*
	54	* Context used for DER to key decoding.
	55	*/
	56	struct msblob2key_ctx_st {
	57	PROV_CTX *provctx;
	58	const struct keytype_desc_st *desc;
398f8fe1 RL	59	/* The selection that is passed to msblob2key_decode() */
398f8fe1 RL	60	int selection;
f4e46b81 RL	61	};
	62
	63	static struct msblob2key_ctx_st *
	64	msblob2key_newctx(void provctx, const struct keytype_desc_st desc)
	65	{
	66	struct msblob2key_ctx_st ctx = OPENSSL_zalloc(sizeof(ctx));
	67
	68	if (ctx != NULL) {
	69	ctx->provctx = provctx;
	70	ctx->desc = desc;
	71	}
	72	return ctx;
	73	}
	74
	75	static void msblob2key_freectx(void *vctx)
	76	{
	77	struct msblob2key_ctx_st *ctx = vctx;
	78
	79	OPENSSL_free(ctx);
	80	}
	81
f4e46b81 RL	82	static int msblob2key_decode(void vctx, OSSL_CORE_BIO cin, int selection,
	83	OSSL_CALLBACK data_cb, void data_cbarg,
	84	OSSL_PASSPHRASE_CALLBACK pw_cb, void pw_cbarg)
	85	{
	86	struct msblob2key_ctx_st *ctx = vctx;
	87	BIO *in = ossl_bio_new_from_core_bio(ctx->provctx, cin);
	88	const unsigned char *p;
	89	unsigned char hdr_buf[16], *buf = NULL;
	90	unsigned int bitlen, magic, length;
	91	int isdss = -1;
	92	int ispub = -1;
	93	void *key = NULL;
	94	int ok = 0;
	95
352a0bca	96	if (in == NULL)
	97	return 0;
	98
f4e46b81 RL	99	if (BIO_read(in, hdr_buf, 16) != 16) {
f4e46b81 RL	100	ERR_raise(ERR_LIB_PEM, PEM_R_KEYBLOB_TOO_SHORT);
9cc97ddf	101	goto next;
f4e46b81	102	}
9cc97ddf	103	ERR_set_mark();
f4e46b81	104	p = hdr_buf;
9cc97ddf RL	105	ok = ossl_do_blob_header(&p, 16, &magic, &bitlen, &isdss, &ispub) > 0;
	106	ERR_pop_to_mark();
	107	if (!ok)
	108	goto next;
	109
398f8fe1	110	ctx->selection = selection;
9cc97ddf	111	ok = 0; /* Assume that we fail */
f4e46b81 RL	112
	113	if ((isdss && ctx->desc->type != EVP_PKEY_DSA)
	114	\|\| (!isdss && ctx->desc->type != EVP_PKEY_RSA))
9cc97ddf	115	goto next;
f4e46b81 RL	116
	117	length = ossl_blob_length(bitlen, isdss, ispub);
	118	if (length > BLOB_MAX_LENGTH) {
	119	ERR_raise(ERR_LIB_PEM, PEM_R_HEADER_TOO_LONG);
9cc97ddf	120	goto next;
f4e46b81 RL	121	}
f4e46b81 RL	122	buf = OPENSSL_malloc(length);
e077455e	123	if (buf == NULL)
9cc97ddf	124	goto end;
f4e46b81 RL	125	p = buf;
	126	if (BIO_read(in, buf, length) != (int)length) {
	127	ERR_raise(ERR_LIB_PEM, PEM_R_KEYBLOB_TOO_SHORT);
9cc97ddf	128	goto next;
f4e46b81 RL	129	}
	130
	131	if ((selection == 0
	132	\|\| (selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
	133	&& !ispub
	134	&& ctx->desc->read_private_key != NULL) {
	135	struct ossl_passphrase_data_st pwdata;
	136
	137	memset(&pwdata, 0, sizeof(pwdata));
	138	if (!ossl_pw_set_ossl_passphrase_cb(&pwdata, pw_cb, pw_cbarg))
9cc97ddf	139	goto end;
f4e46b81 RL	140	p = buf;
	141	key = ctx->desc->read_private_key(&p, bitlen, ispub);
	142	if (selection != 0 && key == NULL)
	143	goto next;
	144	}
	145	if (key == NULL && (selection == 0
	146	\|\| (selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
	147	&& ispub
	148	&& ctx->desc->read_public_key != NULL) {
	149	p = buf;
	150	key = ctx->desc->read_public_key(&p, bitlen, ispub);
	151	if (selection != 0 && key == NULL)
	152	goto next;
	153	}
	154
	155	if (key != NULL && ctx->desc->adjust_key != NULL)
	156	ctx->desc->adjust_key(key, ctx);
	157
	158	next:
9cc97ddf RL	159	/*
	160	* Indicated that we successfully decoded something, or not at all.
	161	* Ending up "empty handed" is not an error.
	162	*/
	163	ok = 1;
	164
f4e46b81 RL	165	/*
	166	* We free resources here so it's not held up during the callback, because
	167	* we know the process is recursive and the allocated chunks of memory
	168	* add up.
	169	*/
	170	OPENSSL_free(buf);
	171	BIO_free(in);
	172	buf = NULL;
	173	in = NULL;
	174
	175	if (key != NULL) {
	176	OSSL_PARAM params[4];
	177	int object_type = OSSL_OBJECT_PKEY;
	178
	179	params[0] =
	180	OSSL_PARAM_construct_int(OSSL_OBJECT_PARAM_TYPE, &object_type);
	181	params[1] =
	182	OSSL_PARAM_construct_utf8_string(OSSL_OBJECT_PARAM_DATA_TYPE,
	183	(char *)ctx->desc->name, 0);
	184	/* The address of the key becomes the octet string */
	185	params[2] =
	186	OSSL_PARAM_construct_octet_string(OSSL_OBJECT_PARAM_REFERENCE,
	187	&key, sizeof(key));
	188	params[3] = OSSL_PARAM_construct_end();
	189
	190	ok = data_cb(params, data_cbarg);
	191	}
	192
9cc97ddf	193	end:
f4e46b81 RL	194	BIO_free(in);
	195	OPENSSL_free(buf);
	196	ctx->desc->free_key(key);
	197
	198	return ok;
	199	}
	200
	201	static int
	202	msblob2key_export_object(void *vctx,
	203	const void *reference, size_t reference_sz,
	204	OSSL_CALLBACK export_cb, void export_cbarg)
	205	{
	206	struct msblob2key_ctx_st *ctx = vctx;
	207	OSSL_FUNC_keymgmt_export_fn *export =
	208	ossl_prov_get_keymgmt_export(ctx->desc->fns);
	209	void *keydata;
	210
	211	if (reference_sz == sizeof(keydata) && export != NULL) {
	212	/* The contents of the reference is the address to our object */
	213	keydata = (void *)reference;
	214
398f8fe1	215	return export(keydata, ctx->selection, export_cb, export_cbarg);
f4e46b81 RL	216	}
	217	return 0;
	218	}
	219
	220	/* ---------------------------------------------------------------------- */
	221
	222	#define dsa_decode_private_key (b2i_of_void_fn *)ossl_b2i_DSA_after_header
	223	#define dsa_decode_public_key (b2i_of_void_fn *)ossl_b2i_DSA_after_header
	224	#define dsa_adjust NULL
	225	#define dsa_free (void ()(void ))DSA_free
	226
	227	/* ---------------------------------------------------------------------- */
	228
	229	#define rsa_decode_private_key (b2i_of_void_fn *)ossl_b2i_RSA_after_header
	230	#define rsa_decode_public_key (b2i_of_void_fn *)ossl_b2i_RSA_after_header
	231
	232	static void rsa_adjust(void key, struct msblob2key_ctx_st ctx)
	233	{
	234	ossl_rsa_set0_libctx(key, PROV_LIBCTX_OF(ctx->provctx));
	235	}
	236
	237	#define rsa_free (void ()(void ))RSA_free
	238
	239	/* ---------------------------------------------------------------------- */
	240
	241	#define IMPLEMENT_MSBLOB(KEYTYPE, keytype) \
	242	static const struct keytype_desc_st mstype##2##keytype##_desc = { \
	243	EVP_PKEY_##KEYTYPE, #KEYTYPE, \
	244	ossl_##keytype##_keymgmt_functions, \
	245	keytype##_decode_private_key, \
	246	keytype##_decode_public_key, \
	247	keytype##_adjust, \
	248	keytype##_free \
	249	}; \
	250	static OSSL_FUNC_decoder_newctx_fn msblob2##keytype##_newctx; \
	251	static void msblob2##keytype##_newctx(void provctx) \
	252	{ \
	253	return msblob2key_newctx(provctx, &mstype##2##keytype##_desc); \
	254	} \
	255	const OSSL_DISPATCH \
	256	ossl_msblob_to_##keytype##_decoder_functions[] = { \
	257	{ OSSL_FUNC_DECODER_NEWCTX, \
	258	(void (*)(void))msblob2##keytype##_newctx }, \
	259	{ OSSL_FUNC_DECODER_FREECTX, \
	260	(void (*)(void))msblob2key_freectx }, \
f4e46b81 RL	261	{ OSSL_FUNC_DECODER_DECODE, \
	262	(void (*)(void))msblob2key_decode }, \
	263	{ OSSL_FUNC_DECODER_EXPORT_OBJECT, \
	264	(void (*)(void))msblob2key_export_object }, \
	265	{ 0, NULL } \
	266	}
	267
	268	#ifndef OPENSSL_NO_DSA
	269	IMPLEMENT_MSBLOB(DSA, dsa);
	270	#endif
	271	IMPLEMENT_MSBLOB(RSA, rsa);