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freebsd-skq/contrib/ldns/keys.c
Dag-Erling Smørgrav 986ba33c7a Upgrade LDNS to 1.7.0. 
I've been holding back on this because 1.7.0 requires OpenSSL 1.1.0 or
newer for full DANE support.  But we can't wait forever, and nothing in
base uses DANE anyway, so here we go.
2018-05-12 12:00:18 +00:00

2225 lines
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/*
* keys.c handle private keys for use in DNSSEC
*
* This module should hide some of the openSSL complexities
* and give a general interface for private keys and hmac
* handling
*
* (c) NLnet Labs, 2004-2006
*
* See the file LICENSE for the license
*/
#include <ldns/config.h>
#include <ldns/ldns.h>
#ifdef HAVE_SSL
#include <openssl/ssl.h>
#include <openssl/engine.h>
#include <openssl/rand.h>
#endif /* HAVE_SSL */
ldns_lookup_table ldns_signing_algorithms[] = {
{ LDNS_SIGN_RSAMD5, "RSAMD5" },
{ LDNS_SIGN_RSASHA1, "RSASHA1" },
{ LDNS_SIGN_RSASHA1_NSEC3, "RSASHA1-NSEC3-SHA1" },
#ifdef USE_SHA2
{ LDNS_SIGN_RSASHA256, "RSASHA256" },
{ LDNS_SIGN_RSASHA512, "RSASHA512" },
#endif
#ifdef USE_GOST
{ LDNS_SIGN_ECC_GOST, "ECC-GOST" },
#endif
#ifdef USE_ECDSA
{ LDNS_SIGN_ECDSAP256SHA256, "ECDSAP256SHA256" },
{ LDNS_SIGN_ECDSAP384SHA384, "ECDSAP384SHA384" },
#endif
#ifdef USE_ED25519
{ LDNS_SIGN_ED25519, "ED25519" },
#endif
#ifdef USE_ED448
{ LDNS_SIGN_ED448, "ED448" },
#endif
#ifdef USE_DSA
{ LDNS_SIGN_DSA, "DSA" },
{ LDNS_SIGN_DSA_NSEC3, "DSA-NSEC3-SHA1" },
#endif
{ LDNS_SIGN_HMACMD5, "hmac-md5.sig-alg.reg.int" },
{ LDNS_SIGN_HMACSHA1, "hmac-sha1" },
{ LDNS_SIGN_HMACSHA256, "hmac-sha256" },
{ LDNS_SIGN_HMACSHA224, "hmac-sha224" },
{ LDNS_SIGN_HMACSHA384, "hmac-sha384" },
{ LDNS_SIGN_HMACSHA512, "hmac-sha512" },
{ 0, NULL }
};
ldns_key_list *
ldns_key_list_new(void)
{
ldns_key_list *key_list = LDNS_MALLOC(ldns_key_list);
if (!key_list) {
return NULL;
} else {
key_list->_key_count = 0;
key_list->_keys = NULL;
return key_list;
}
}
ldns_key *
ldns_key_new(void)
{
ldns_key *newkey;
newkey = LDNS_MALLOC(ldns_key);
if (!newkey) {
return NULL;
} else {
/* some defaults - not sure wether to do this */
ldns_key_set_use(newkey, true);
ldns_key_set_flags(newkey, LDNS_KEY_ZONE_KEY);
ldns_key_set_origttl(newkey, 0);
ldns_key_set_keytag(newkey, 0);
ldns_key_set_inception(newkey, 0);
ldns_key_set_expiration(newkey, 0);
ldns_key_set_pubkey_owner(newkey, NULL);
#ifdef HAVE_SSL
ldns_key_set_evp_key(newkey, NULL);
#endif /* HAVE_SSL */
ldns_key_set_hmac_key(newkey, NULL);
ldns_key_set_external_key(newkey, NULL);
return newkey;
}
}
ldns_status
ldns_key_new_frm_fp(ldns_key **k, FILE *fp)
{
return ldns_key_new_frm_fp_l(k, fp, NULL);
}
#ifdef HAVE_SSL
ldns_status
ldns_key_new_frm_engine(ldns_key **key, ENGINE *e, char *key_id, ldns_algorithm alg)
{
ldns_key *k;
k = ldns_key_new();
if(!k) return LDNS_STATUS_MEM_ERR;
#ifndef S_SPLINT_S
k->_key.key = ENGINE_load_private_key(e, key_id, UI_OpenSSL(), NULL);
if(!k->_key.key) {
ldns_key_free(k);
return LDNS_STATUS_ERR;
}
ldns_key_set_algorithm(k, (ldns_signing_algorithm) alg);
if (!k->_key.key) {
ldns_key_free(k);
return LDNS_STATUS_ENGINE_KEY_NOT_LOADED;
}
#endif /* splint */
*key = k;
return LDNS_STATUS_OK;
}
#endif
#ifdef USE_GOST
/** store GOST engine reference loaded into OpenSSL library */
ENGINE* ldns_gost_engine = NULL;
int
ldns_key_EVP_load_gost_id(void)
{
static int gost_id = 0;
const EVP_PKEY_ASN1_METHOD* meth;
ENGINE* e;
if(gost_id) return gost_id;
/* see if configuration loaded gost implementation from other engine*/
meth = EVP_PKEY_asn1_find_str(NULL, "gost2001", -1);
if(meth) {
EVP_PKEY_asn1_get0_info(&gost_id, NULL, NULL, NULL, NULL, meth);
return gost_id;
}
/* see if engine can be loaded already */
e = ENGINE_by_id("gost");
if(!e) {
/* load it ourself, in case statically linked */
ENGINE_load_builtin_engines();
ENGINE_load_dynamic();
e = ENGINE_by_id("gost");
}
if(!e) {
/* no gost engine in openssl */
return 0;
}
if(!ENGINE_set_default(e, ENGINE_METHOD_ALL)) {
ENGINE_finish(e);
ENGINE_free(e);
return 0;
}
meth = EVP_PKEY_asn1_find_str(&e, "gost2001", -1);
if(!meth) {
/* algo not found */
ENGINE_finish(e);
ENGINE_free(e);
return 0;
}
/* Note: do not ENGINE_finish and ENGINE_free the acquired engine
* on some platforms this frees up the meth and unloads gost stuff */
ldns_gost_engine = e;
EVP_PKEY_asn1_get0_info(&gost_id, NULL, NULL, NULL, NULL, meth);
return gost_id;
}
void ldns_key_EVP_unload_gost(void)
{
if(ldns_gost_engine) {
ENGINE_finish(ldns_gost_engine);
ENGINE_free(ldns_gost_engine);
ldns_gost_engine = NULL;
}
}
/** read GOST private key */
static EVP_PKEY*
ldns_key_new_frm_fp_gost_l(FILE* fp, int* line_nr)
{
char token[16384];
const unsigned char* pp;
int gost_id;
EVP_PKEY* pkey;
ldns_rdf* b64rdf = NULL;
gost_id = ldns_key_EVP_load_gost_id();
if(!gost_id)
return NULL;
if (ldns_fget_keyword_data_l(fp, "GostAsn1", ": ", token, "\n",
sizeof(token), line_nr) == -1)
return NULL;
while(strlen(token) < 96) {
/* read more b64 from the file, b64 split on multiple lines */
if(ldns_fget_token_l(fp, token+strlen(token), "\n",
sizeof(token)-strlen(token), line_nr) == -1)
return NULL;
}
if(ldns_str2rdf_b64(&b64rdf, token) != LDNS_STATUS_OK)
return NULL;
pp = (unsigned char*)ldns_rdf_data(b64rdf);
pkey = d2i_PrivateKey(gost_id, NULL, &pp, (int)ldns_rdf_size(b64rdf));
ldns_rdf_deep_free(b64rdf);
return pkey;
}
#endif
#ifdef USE_ECDSA
/** calculate public key from private key */
static int
ldns_EC_KEY_calc_public(EC_KEY* ec)
{
EC_POINT* pub_key;
const EC_GROUP* group;
group = EC_KEY_get0_group(ec);
pub_key = EC_POINT_new(group);
if(!pub_key) return 0;
if(!EC_POINT_copy(pub_key, EC_GROUP_get0_generator(group))) {
EC_POINT_free(pub_key);
return 0;
}
if(!EC_POINT_mul(group, pub_key, EC_KEY_get0_private_key(ec),
NULL, NULL, NULL)) {
EC_POINT_free(pub_key);
return 0;
}
if(EC_KEY_set_public_key(ec, pub_key) == 0) {
EC_POINT_free(pub_key);
return 0;
}
EC_POINT_free(pub_key);
return 1;
}
/** read ECDSA private key */
static EVP_PKEY*
ldns_key_new_frm_fp_ecdsa_l(FILE* fp, ldns_algorithm alg, int* line_nr)
{
char token[16384];
ldns_rdf* b64rdf = NULL;
unsigned char* pp;
BIGNUM* bn;
EVP_PKEY* evp_key;
EC_KEY* ec;
if (ldns_fget_keyword_data_l(fp, "PrivateKey", ": ", token, "\n",
sizeof(token), line_nr) == -1)
return NULL;
if(ldns_str2rdf_b64(&b64rdf, token) != LDNS_STATUS_OK)
return NULL;
pp = (unsigned char*)ldns_rdf_data(b64rdf);
if(alg == LDNS_ECDSAP256SHA256)
ec = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
else if(alg == LDNS_ECDSAP384SHA384)
ec = EC_KEY_new_by_curve_name(NID_secp384r1);
else ec = NULL;
if(!ec) {
ldns_rdf_deep_free(b64rdf);
return NULL;
}
bn = BN_bin2bn(pp, (int)ldns_rdf_size(b64rdf), NULL);
ldns_rdf_deep_free(b64rdf);
if(!bn) {
EC_KEY_free(ec);
return NULL;
}
EC_KEY_set_private_key(ec, bn);
BN_free(bn);
if(!ldns_EC_KEY_calc_public(ec)) {
EC_KEY_free(ec);
return NULL;
}
evp_key = EVP_PKEY_new();
if(!evp_key) {
EC_KEY_free(ec);
return NULL;
}
if (!EVP_PKEY_assign_EC_KEY(evp_key, ec)) {
EVP_PKEY_free(evp_key);
EC_KEY_free(ec);
return NULL;
}
return evp_key;
}
#endif
#ifdef USE_ED25519
/** turn private key buffer into EC_KEY structure */
static EC_KEY*
ldns_ed25519_priv_raw(uint8_t* pkey, int plen)
{
const unsigned char* pp;
uint8_t buf[256];
int buflen = 0;
uint8_t pre[] = {0x30, 0x32, 0x02, 0x01, 0x01, 0x04, 0x20};
int pre_len = 7;
uint8_t post[] = {0xa0, 0x0b, 0x06, 0x09, 0x2b, 0x06, 0x01, 0x04,
0x01, 0xda, 0x47, 0x0f, 0x01};
int post_len = 13;
int i;
/* ASN looks like this for ED25519
* 30320201010420 <32byteskey>
* andparameters a00b06092b06010401da470f01
* (noparameters, preamble is 30250201010420).
* the key is reversed (little endian).
*/
buflen = pre_len + plen + post_len;
if((size_t)buflen > sizeof(buf))
return NULL;
memmove(buf, pre, pre_len);
/* reverse the pkey into the buf */
for(i=0; i<plen; i++)
buf[pre_len+i] = pkey[plen-1-i];
memmove(buf+pre_len+plen, post, post_len);
pp = buf;
return d2i_ECPrivateKey(NULL, &pp, buflen);
}
/** read ED25519 private key */
static EVP_PKEY*
ldns_key_new_frm_fp_ed25519_l(FILE* fp, int* line_nr)
{
char token[16384];
ldns_rdf* b64rdf = NULL;
EVP_PKEY* evp_key;
EC_KEY* ec;
if (ldns_fget_keyword_data_l(fp, "PrivateKey", ": ", token, "\n",
sizeof(token), line_nr) == -1)
return NULL;
if(ldns_str2rdf_b64(&b64rdf, token) != LDNS_STATUS_OK)
return NULL;
/* we use d2i_ECPrivateKey because it calculates the public key
* from the private part, which others, EC_KEY_set_private_key,
* and o2i methods, do not do */
/* for that the private key has to be encoded in ASN1 notation
* with a X25519 prefix on it */
ec = ldns_ed25519_priv_raw(ldns_rdf_data(b64rdf),
(int)ldns_rdf_size(b64rdf));
ldns_rdf_deep_free(b64rdf);
if(!ec) return NULL;
if(EC_GROUP_get_curve_name(EC_KEY_get0_group(ec)) != NID_X25519) {
/* wrong group, bad asn conversion */
EC_KEY_free(ec);
return NULL;
}
evp_key = EVP_PKEY_new();
if(!evp_key) {
EC_KEY_free(ec);
return NULL;
}
if (!EVP_PKEY_assign_EC_KEY(evp_key, ec)) {
EVP_PKEY_free(evp_key);
EC_KEY_free(ec);
return NULL;
}
return evp_key;
}
#endif
#ifdef USE_ED448
/** turn private key buffer into EC_KEY structure */
static EC_KEY*
ldns_ed448_priv_raw(uint8_t* pkey, int plen)
{
const unsigned char* pp;
uint8_t buf[256];
int buflen = 0;
uint8_t pre[] = {0x30, 0x4b, 0x02, 0x01, 0x01, 0x04, 0x39};
int pre_len = 7;
uint8_t post[] = {0xa0, 0x0b, 0x06, 0x09, 0x2b, 0x06, 0x01, 0x04,
0x01, 0xda, 0x47, 0x0f, 0x02};
int post_len = 13;
int i;
/* ASN looks like this for ED25519
* And for ED448, the parameters are ...02 instead of ...01
* For ED25519 it was:
* 30320201010420 <32byteskey>
* andparameters a00b06092b06010401da470f01
* (noparameters, preamble is 30250201010420).
* the key is reversed (little endian).
*
* For ED448 the key is 57 bytes, and that changes lengths.
* 304b0201010439 <57bytekey> a00b06092b06010401da470f02
*/
buflen = pre_len + plen + post_len;
if((size_t)buflen > sizeof(buf))
return NULL;
memmove(buf, pre, pre_len);
/* reverse the pkey into the buf */
for(i=0; i<plen; i++)
buf[pre_len+i] = pkey[plen-1-i];
memmove(buf+pre_len+plen, post, post_len);
pp = buf;
return d2i_ECPrivateKey(NULL, &pp, buflen);
}
/** read ED448 private key */
static EVP_PKEY*
ldns_key_new_frm_fp_ed448_l(FILE* fp, int* line_nr)
{
char token[16384];
ldns_rdf* b64rdf = NULL;
EVP_PKEY* evp_key;
EC_KEY* ec;
if (ldns_fget_keyword_data_l(fp, "PrivateKey", ": ", token, "\n",
sizeof(token), line_nr) == -1)
return NULL;
if(ldns_str2rdf_b64(&b64rdf, token) != LDNS_STATUS_OK)
return NULL;
/* convert private key into ASN notation and then convert that */
ec = ldns_ed448_priv_raw(ldns_rdf_data(b64rdf),
(int)ldns_rdf_size(b64rdf));
ldns_rdf_deep_free(b64rdf);
if(!ec) return NULL;
if(EC_GROUP_get_curve_name(EC_KEY_get0_group(ec)) != NID_X448) {
/* wrong group, bad asn conversion */
EC_KEY_free(ec);
return NULL;
}
evp_key = EVP_PKEY_new();
if(!evp_key) {
EC_KEY_free(ec);
return NULL;
}
if (!EVP_PKEY_assign_EC_KEY(evp_key, ec)) {
EVP_PKEY_free(evp_key);
EC_KEY_free(ec);
return NULL;
}
return evp_key;
}
#endif
ldns_status
ldns_key_new_frm_fp_l(ldns_key **key, FILE *fp, int *line_nr)
{
ldns_key *k;
char *d;
ldns_signing_algorithm alg;
ldns_rr *key_rr;
#ifdef HAVE_SSL
RSA *rsa;
#ifdef USE_DSA
DSA *dsa;
#endif
unsigned char *hmac;
size_t hmac_size;
#endif /* HAVE_SSL */
k = ldns_key_new();
d = LDNS_XMALLOC(char, LDNS_MAX_LINELEN);
if (!k || !d) {
ldns_key_free(k);
LDNS_FREE(d);
return LDNS_STATUS_MEM_ERR;
}
alg = 0;
/* the file is highly structured. Do this in sequence */
/* RSA:
* Private-key-format: v1.x.
* Algorithm: 1 (RSA)
*/
/* get the key format version number */
if (ldns_fget_keyword_data_l(fp, "Private-key-format", ": ", d, "\n",
LDNS_MAX_LINELEN, line_nr) == -1) {
/* no version information */
ldns_key_free(k);
LDNS_FREE(d);
return LDNS_STATUS_SYNTAX_ERR;
}
if (strncmp(d, "v1.", 3) != 0) {
ldns_key_free(k);
LDNS_FREE(d);
return LDNS_STATUS_SYNTAX_VERSION_ERR;
}
/* get the algorithm type, our file function strip ( ) so there are
* not in the return string! */
if (ldns_fget_keyword_data_l(fp, "Algorithm", ": ", d, "\n",
LDNS_MAX_LINELEN, line_nr) == -1) {
/* no alg information */
ldns_key_free(k);
LDNS_FREE(d);
return LDNS_STATUS_SYNTAX_ALG_ERR;
}
if (strncmp(d, "1 RSA", 2) == 0) {
alg = LDNS_SIGN_RSAMD5;
}
if (strncmp(d, "2 DH", 2) == 0) {
alg = (ldns_signing_algorithm)LDNS_DH;
}
if (strncmp(d, "3 DSA", 2) == 0) {
#ifdef USE_DSA
alg = LDNS_SIGN_DSA;
#else
# ifdef STDERR_MSGS
fprintf(stderr, "Warning: DSA not compiled into this ");
fprintf(stderr, "version of ldns\n");
# endif
#endif
}
if (strncmp(d, "4 ECC", 2) == 0) {
alg = (ldns_signing_algorithm)LDNS_ECC;
}
if (strncmp(d, "5 RSASHA1", 2) == 0) {
alg = LDNS_SIGN_RSASHA1;
}
if (strncmp(d, "6 DSA", 2) == 0) {
#ifdef USE_DSA
alg = LDNS_SIGN_DSA_NSEC3;
#else
# ifdef STDERR_MSGS
fprintf(stderr, "Warning: DSA not compiled into this ");
fprintf(stderr, "version of ldns\n");
# endif
#endif
}
if (strncmp(d, "7 RSASHA1", 2) == 0) {
alg = LDNS_SIGN_RSASHA1_NSEC3;
}
if (strncmp(d, "8 RSASHA256", 2) == 0) {
#ifdef USE_SHA2
alg = LDNS_SIGN_RSASHA256;
#else
# ifdef STDERR_MSGS
fprintf(stderr, "Warning: SHA256 not compiled into this ");
fprintf(stderr, "version of ldns\n");
# endif
#endif
}
if (strncmp(d, "10 RSASHA512", 3) == 0) {
#ifdef USE_SHA2
alg = LDNS_SIGN_RSASHA512;
#else
# ifdef STDERR_MSGS
fprintf(stderr, "Warning: SHA512 not compiled into this ");
fprintf(stderr, "version of ldns\n");
# endif
#endif
}
if (strncmp(d, "12 ECC-GOST", 3) == 0) {
#ifdef USE_GOST
alg = LDNS_SIGN_ECC_GOST;
#else
# ifdef STDERR_MSGS
fprintf(stderr, "Warning: ECC-GOST not compiled into this ");
fprintf(stderr, "version of ldns, use --enable-gost\n");
# endif
#endif
}
if (strncmp(d, "13 ECDSAP256SHA256", 3) == 0) {
#ifdef USE_ECDSA
alg = LDNS_SIGN_ECDSAP256SHA256;
#else
# ifdef STDERR_MSGS
fprintf(stderr, "Warning: ECDSA not compiled into this ");
fprintf(stderr, "version of ldns, use --enable-ecdsa\n");
# endif
#endif
}
if (strncmp(d, "14 ECDSAP384SHA384", 3) == 0) {
#ifdef USE_ECDSA
alg = LDNS_SIGN_ECDSAP384SHA384;
#else
# ifdef STDERR_MSGS
fprintf(stderr, "Warning: ECDSA not compiled into this ");
fprintf(stderr, "version of ldns, use --enable-ecdsa\n");
# endif
#endif
}
if (strncmp(d, "15 ED25519", 3) == 0) {
#ifdef USE_ED25519
alg = LDNS_SIGN_ED25519;
#else
# ifdef STDERR_MSGS
fprintf(stderr, "Warning: ED25519 not compiled into this ");
fprintf(stderr, "version of ldns, use --enable-ed25519\n");
# endif
#endif
}
if (strncmp(d, "16 ED448", 3) == 0) {
#ifdef USE_ED448
alg = LDNS_SIGN_ED448;
#else
# ifdef STDERR_MSGS
fprintf(stderr, "Warning: ED448 not compiled into this ");
fprintf(stderr, "version of ldns, use --enable-ed448\n");
# endif
#endif
}
if (strncmp(d, "157 HMAC-MD5", 4) == 0) {
alg = LDNS_SIGN_HMACMD5;
}
if (strncmp(d, "158 HMAC-SHA1", 4) == 0) {
alg = LDNS_SIGN_HMACSHA1;
}
if (strncmp(d, "159 HMAC-SHA256", 4) == 0) {
alg = LDNS_SIGN_HMACSHA256;
}
/* For compatibility with dnssec-keygen */
if (strncmp(d, "161 ", 4) == 0) {
alg = LDNS_SIGN_HMACSHA1;
}
if (strncmp(d, "162 HMAC-SHA224", 4) == 0) {
alg = LDNS_SIGN_HMACSHA224;
}
/* For compatibility with dnssec-keygen */
if (strncmp(d, "163 ", 4) == 0) {
alg = LDNS_SIGN_HMACSHA256;
}
if (strncmp(d, "164 HMAC-SHA384", 4) == 0) {
alg = LDNS_SIGN_HMACSHA384;
}
if (strncmp(d, "165 HMAC-SHA512", 4) == 0) {
alg = LDNS_SIGN_HMACSHA512;
}
LDNS_FREE(d);
switch(alg) {
case LDNS_SIGN_RSAMD5:
case LDNS_SIGN_RSASHA1:
case LDNS_SIGN_RSASHA1_NSEC3:
#ifdef USE_SHA2
case LDNS_SIGN_RSASHA256:
case LDNS_SIGN_RSASHA512:
#endif
ldns_key_set_algorithm(k, alg);
#ifdef HAVE_SSL
rsa = ldns_key_new_frm_fp_rsa_l(fp, line_nr);
if (!rsa) {
ldns_key_free(k);
return LDNS_STATUS_ERR;
}
ldns_key_assign_rsa_key(k, rsa);
#endif /* HAVE_SSL */
break;
#ifdef USE_DSA
case LDNS_SIGN_DSA:
case LDNS_SIGN_DSA_NSEC3:
ldns_key_set_algorithm(k, alg);
#ifdef HAVE_SSL
dsa = ldns_key_new_frm_fp_dsa_l(fp, line_nr);
if (!dsa) {
ldns_key_free(k);
return LDNS_STATUS_ERR;
}
ldns_key_assign_dsa_key(k, dsa);
#endif /* HAVE_SSL */
break;
#endif /* USE_DSA */
case LDNS_SIGN_HMACMD5:
case LDNS_SIGN_HMACSHA1:
case LDNS_SIGN_HMACSHA224:
case LDNS_SIGN_HMACSHA256:
case LDNS_SIGN_HMACSHA384:
case LDNS_SIGN_HMACSHA512:
ldns_key_set_algorithm(k, alg);
#ifdef HAVE_SSL
hmac = ldns_key_new_frm_fp_hmac_l(fp, line_nr, &hmac_size);
if (!hmac) {
ldns_key_free(k);
return LDNS_STATUS_ERR;
}
ldns_key_set_hmac_size(k, hmac_size);
ldns_key_set_hmac_key(k, hmac);
#endif /* HAVE_SSL */
break;
case LDNS_SIGN_ECC_GOST:
ldns_key_set_algorithm(k, alg);
#if defined(HAVE_SSL) && defined(USE_GOST)
if(!ldns_key_EVP_load_gost_id()) {
ldns_key_free(k);
return LDNS_STATUS_CRYPTO_ALGO_NOT_IMPL;
}
ldns_key_set_evp_key(k,
ldns_key_new_frm_fp_gost_l(fp, line_nr));
#ifndef S_SPLINT_S
if(!k->_key.key) {
ldns_key_free(k);
return LDNS_STATUS_ERR;
}
#endif /* splint */
#endif
break;
#ifdef USE_ECDSA
case LDNS_SIGN_ECDSAP256SHA256:
case LDNS_SIGN_ECDSAP384SHA384:
ldns_key_set_algorithm(k, alg);
ldns_key_set_evp_key(k,
ldns_key_new_frm_fp_ecdsa_l(fp, (ldns_algorithm)alg, line_nr));
#ifndef S_SPLINT_S
if(!k->_key.key) {
ldns_key_free(k);
return LDNS_STATUS_ERR;
}
#endif /* splint */
break;
#endif
#ifdef USE_ED25519
case LDNS_SIGN_ED25519:
ldns_key_set_algorithm(k, alg);
ldns_key_set_evp_key(k,
ldns_key_new_frm_fp_ed25519_l(fp, line_nr));
#ifndef S_SPLINT_S
if(!k->_key.key) {
ldns_key_free(k);
return LDNS_STATUS_ERR;
}
#endif /* splint */
break;
#endif
#ifdef USE_ED448
case LDNS_SIGN_ED448:
ldns_key_set_algorithm(k, alg);
ldns_key_set_evp_key(k,
ldns_key_new_frm_fp_ed448_l(fp, line_nr));
#ifndef S_SPLINT_S
if(!k->_key.key) {
ldns_key_free(k);
return LDNS_STATUS_ERR;
}
#endif /* splint */
break;
#endif
default:
ldns_key_free(k);
return LDNS_STATUS_SYNTAX_ALG_ERR;
}
key_rr = ldns_key2rr(k);
ldns_key_set_keytag(k, ldns_calc_keytag(key_rr));
ldns_rr_free(key_rr);
if (key) {
*key = k;
return LDNS_STATUS_OK;
}
ldns_key_free(k);
return LDNS_STATUS_ERR;
}
#ifdef HAVE_SSL
RSA *
ldns_key_new_frm_fp_rsa(FILE *f)
{
return ldns_key_new_frm_fp_rsa_l(f, NULL);
}
RSA *
ldns_key_new_frm_fp_rsa_l(FILE *f, int *line_nr)
{
/* we parse
* Modulus:
* PublicExponent:
* PrivateExponent:
* Prime1:
* Prime2:
* Exponent1:
* Exponent2:
* Coefficient:
*
* man 3 RSA:
*
* struct
* {
* BIGNUM *n; // public modulus
* BIGNUM *e; // public exponent
* BIGNUM *d; // private exponent
* BIGNUM *p; // secret prime factor
* BIGNUM *q; // secret prime factor
* BIGNUM *dmp1; // d mod (p-1)
* BIGNUM *dmq1; // d mod (q-1)
* BIGNUM *iqmp; // q^-1 mod p
* // ...
*
*/
char *b;
RSA *rsa;
uint8_t *buf;
int i;
BIGNUM *n=NULL, *e=NULL, *d=NULL, *p=NULL, *q=NULL,
*dmp1=NULL, *dmq1=NULL, *iqmp=NULL;
b = LDNS_XMALLOC(char, LDNS_MAX_LINELEN);
buf = LDNS_XMALLOC(uint8_t, LDNS_MAX_LINELEN);
rsa = RSA_new();
if (!b || !rsa || !buf) {
goto error;
}
/* I could use functions again, but that seems an overkill,
* allthough this also looks tedious
*/
/* Modules, rsa->n */
if (ldns_fget_keyword_data_l(f, "Modulus", ": ", b, "\n", LDNS_MAX_LINELEN, line_nr) == -1) {
goto error;
}
i = ldns_b64_pton((const char*)b, buf, ldns_b64_ntop_calculate_size(strlen(b)));
#ifndef S_SPLINT_S
n = BN_bin2bn((const char unsigned*)buf, i, NULL);
if (!n) {
goto error;
}
/* PublicExponent, rsa->e */
if (ldns_fget_keyword_data_l(f, "PublicExponent", ": ", b, "\n", LDNS_MAX_LINELEN, line_nr) == -1) {
goto error;
}
i = ldns_b64_pton((const char*)b, buf, ldns_b64_ntop_calculate_size(strlen(b)));
e = BN_bin2bn((const char unsigned*)buf, i, NULL);
if (!e) {
goto error;
}
/* PrivateExponent, rsa->d */
if (ldns_fget_keyword_data_l(f, "PrivateExponent", ": ", b, "\n", LDNS_MAX_LINELEN, line_nr) == -1) {
goto error;
}
i = ldns_b64_pton((const char*)b, buf, ldns_b64_ntop_calculate_size(strlen(b)));
d = BN_bin2bn((const char unsigned*)buf, i, NULL);
if (!d) {
goto error;
}
/* Prime1, rsa->p */
if (ldns_fget_keyword_data_l(f, "Prime1", ": ", b, "\n", LDNS_MAX_LINELEN, line_nr) == -1) {
goto error;
}
i = ldns_b64_pton((const char*)b, buf, ldns_b64_ntop_calculate_size(strlen(b)));
p = BN_bin2bn((const char unsigned*)buf, i, NULL);
if (!p) {
goto error;
}
/* Prime2, rsa->q */
if (ldns_fget_keyword_data_l(f, "Prime2", ": ", b, "\n", LDNS_MAX_LINELEN, line_nr) == -1) {
goto error;
}
i = ldns_b64_pton((const char*)b, buf, ldns_b64_ntop_calculate_size(strlen(b)));
q = BN_bin2bn((const char unsigned*)buf, i, NULL);
if (!q) {
goto error;
}
/* Exponent1, rsa->dmp1 */
if (ldns_fget_keyword_data_l(f, "Exponent1", ": ", b, "\n", LDNS_MAX_LINELEN, line_nr) == -1) {
goto error;
}
i = ldns_b64_pton((const char*)b, buf, ldns_b64_ntop_calculate_size(strlen(b)));
dmp1 = BN_bin2bn((const char unsigned*)buf, i, NULL);
if (!dmp1) {
goto error;
}
/* Exponent2, rsa->dmq1 */
if (ldns_fget_keyword_data_l(f, "Exponent2", ": ", b, "\n", LDNS_MAX_LINELEN, line_nr) == -1) {
goto error;
}
i = ldns_b64_pton((const char*)b, buf, ldns_b64_ntop_calculate_size(strlen(b)));
dmq1 = BN_bin2bn((const char unsigned*)buf, i, NULL);
if (!dmq1) {
goto error;
}
/* Coefficient, rsa->iqmp */
if (ldns_fget_keyword_data_l(f, "Coefficient", ": ", b, "\n", LDNS_MAX_LINELEN, line_nr) == -1) {
goto error;
}
i = ldns_b64_pton((const char*)b, buf, ldns_b64_ntop_calculate_size(strlen(b)));
iqmp = BN_bin2bn((const char unsigned*)buf, i, NULL);
if (!iqmp) {
goto error;
}
#endif /* splint */
#if OPENSSL_VERSION_NUMBER < 0x10100000 || defined(HAVE_LIBRESSL)
# ifndef S_SPLINT_S
rsa->n = n;
rsa->e = e;
rsa->d = d;
rsa->p = p;
rsa->q = q;
rsa->dmp1 = dmp1;
rsa->dmq1 = dmq1;
rsa->iqmp = iqmp;
# endif
#else
if(!RSA_set0_key(rsa, n, e, d))
goto error;
n = NULL;
e = NULL;
d = NULL;
if(!RSA_set0_factors(rsa, p, q))
goto error;
p = NULL;
q = NULL;
if(!RSA_set0_crt_params(rsa, dmp1, dmq1, iqmp))
goto error;
#endif
LDNS_FREE(buf);
LDNS_FREE(b);
return rsa;
error:
RSA_free(rsa);
LDNS_FREE(b);
LDNS_FREE(buf);
BN_free(n);
BN_free(e);
BN_free(d);
BN_free(p);
BN_free(q);
BN_free(dmp1);
BN_free(dmq1);
BN_free(iqmp);
return NULL;
}
DSA *
ldns_key_new_frm_fp_dsa(FILE *f)
{
return ldns_key_new_frm_fp_dsa_l(f, NULL);
}
DSA *
ldns_key_new_frm_fp_dsa_l(FILE *f, ATTR_UNUSED(int *line_nr))
{
int i;
char *d;
DSA *dsa;
uint8_t *buf;
BIGNUM *p=NULL, *q=NULL, *g=NULL, *priv_key=NULL, *pub_key=NULL;
d = LDNS_XMALLOC(char, LDNS_MAX_LINELEN);
buf = LDNS_XMALLOC(uint8_t, LDNS_MAX_LINELEN);
dsa = DSA_new();
if (!d || !dsa || !buf) {
goto error;
}
/* the line parser removes the () from the input... */
/* Prime, dsa->p */
if (ldns_fget_keyword_data_l(f, "Primep", ": ", d, "\n", LDNS_MAX_LINELEN, line_nr) == -1) {
goto error;
}
i = ldns_b64_pton((const char*)d, buf, ldns_b64_ntop_calculate_size(strlen(d)));
#ifndef S_SPLINT_S
p = BN_bin2bn((const char unsigned*)buf, i, NULL);
if (!p) {
goto error;
}
/* Subprime, dsa->q */
if (ldns_fget_keyword_data_l(f, "Subprimeq", ": ", d, "\n", LDNS_MAX_LINELEN, line_nr) == -1) {
goto error;
}
i = ldns_b64_pton((const char*)d, buf, ldns_b64_ntop_calculate_size(strlen(d)));
q = BN_bin2bn((const char unsigned*)buf, i, NULL);
if (!q) {
goto error;
}
/* Base, dsa->g */
if (ldns_fget_keyword_data_l(f, "Baseg", ": ", d, "\n", LDNS_MAX_LINELEN, line_nr) == -1) {
goto error;
}
i = ldns_b64_pton((const char*)d, buf, ldns_b64_ntop_calculate_size(strlen(d)));
g = BN_bin2bn((const char unsigned*)buf, i, NULL);
if (!g) {
goto error;
}
/* Private key, dsa->priv_key */
if (ldns_fget_keyword_data_l(f, "Private_valuex", ": ", d, "\n", LDNS_MAX_LINELEN, line_nr) == -1) {
goto error;
}
i = ldns_b64_pton((const char*)d, buf, ldns_b64_ntop_calculate_size(strlen(d)));
priv_key = BN_bin2bn((const char unsigned*)buf, i, NULL);
if (!priv_key) {
goto error;
}
/* Public key, dsa->priv_key */
if (ldns_fget_keyword_data_l(f, "Public_valuey", ": ", d, "\n", LDNS_MAX_LINELEN, line_nr) == -1) {
goto error;
}
i = ldns_b64_pton((const char*)d, buf, ldns_b64_ntop_calculate_size(strlen(d)));
pub_key = BN_bin2bn((const char unsigned*)buf, i, NULL);
if (!pub_key) {
goto error;
}
#endif /* splint */
#if OPENSSL_VERSION_NUMBER < 0x10100000 || defined(HAVE_LIBRESSL)
# ifndef S_SPLINT_S
dsa->p = p;
dsa->q = q;
dsa->g = g;
dsa->priv_key = priv_key;
dsa->pub_key = pub_key;
# endif
#else
if(!DSA_set0_pqg(dsa, p, q, g))
goto error;
p = NULL;
q = NULL;
g = NULL;
if(!DSA_set0_key(dsa, pub_key, priv_key))
goto error;
#endif
LDNS_FREE(buf);
LDNS_FREE(d);
return dsa;
error:
LDNS_FREE(d);
LDNS_FREE(buf);
DSA_free(dsa);
BN_free(p);
BN_free(q);
BN_free(g);
BN_free(priv_key);
BN_free(pub_key);
return NULL;
}
unsigned char *
ldns_key_new_frm_fp_hmac(FILE *f, size_t *hmac_size)
{
return ldns_key_new_frm_fp_hmac_l(f, NULL, hmac_size);
}
unsigned char *
ldns_key_new_frm_fp_hmac_l( FILE *f
, ATTR_UNUSED(int *line_nr)
, size_t *hmac_size
)
{
size_t i, bufsz;
char d[LDNS_MAX_LINELEN];
unsigned char *buf = NULL;
if (ldns_fget_keyword_data_l(f, "Key", ": ", d, "\n", LDNS_MAX_LINELEN, line_nr) == -1) {
goto error;
}
bufsz = ldns_b64_ntop_calculate_size(strlen(d));
buf = LDNS_XMALLOC(unsigned char, bufsz);
i = (size_t) ldns_b64_pton((const char*)d, buf, bufsz);
*hmac_size = i;
return buf;
error:
LDNS_FREE(buf);
*hmac_size = 0;
return NULL;
}
#endif /* HAVE_SSL */
#ifdef USE_GOST
static EVP_PKEY*
ldns_gen_gost_key(void)
{
EVP_PKEY_CTX* ctx;
EVP_PKEY* p = NULL;
int gost_id = ldns_key_EVP_load_gost_id();
if(!gost_id)
return NULL;
ctx = EVP_PKEY_CTX_new_id(gost_id, NULL);
if(!ctx) {
/* the id should be available now */
return NULL;
}
if(EVP_PKEY_CTX_ctrl_str(ctx, "paramset", "A") <= 0) {
/* cannot set paramset */
EVP_PKEY_CTX_free(ctx);
return NULL;
}
if(EVP_PKEY_keygen_init(ctx) <= 0) {
EVP_PKEY_CTX_free(ctx);
return NULL;
}
if(EVP_PKEY_keygen(ctx, &p) <= 0) {
EVP_PKEY_free(p);
EVP_PKEY_CTX_free(ctx);
return NULL;
}
EVP_PKEY_CTX_free(ctx);
return p;
}
#endif
ldns_key *
ldns_key_new_frm_algorithm(ldns_signing_algorithm alg, uint16_t size)
{
ldns_key *k;
#ifdef HAVE_SSL
#ifdef USE_DSA
DSA *d;
#endif /* USE_DSA */
# ifdef USE_ECDSA
EC_KEY *ec = NULL;
# endif
# ifdef HAVE_EVP_PKEY_KEYGEN
EVP_PKEY_CTX *ctx;
# else
RSA *r;
# endif
#else
int i;
uint16_t offset = 0;
#endif
unsigned char *hmac;
k = ldns_key_new();
if (!k) {
return NULL;
}
switch(alg) {
case LDNS_SIGN_RSAMD5:
case LDNS_SIGN_RSASHA1:
case LDNS_SIGN_RSASHA1_NSEC3:
case LDNS_SIGN_RSASHA256:
case LDNS_SIGN_RSASHA512:
#ifdef HAVE_SSL
#ifdef HAVE_EVP_PKEY_KEYGEN
ctx = EVP_PKEY_CTX_new_id(EVP_PKEY_RSA, NULL);
if(!ctx) {
ldns_key_free(k);
return NULL;
}
if(EVP_PKEY_keygen_init(ctx) <= 0) {
ldns_key_free(k);
EVP_PKEY_CTX_free(ctx);
return NULL;
}
if (EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, size) <= 0) {
ldns_key_free(k);
EVP_PKEY_CTX_free(ctx);
return NULL;
}
#ifndef S_SPLINT_S
if (EVP_PKEY_keygen(ctx, &k->_key.key) <= 0) {
ldns_key_free(k);
EVP_PKEY_CTX_free(ctx);
return NULL;
}
#endif
EVP_PKEY_CTX_free(ctx);
#else /* HAVE_EVP_PKEY_KEYGEN */
r = RSA_generate_key((int)size, RSA_F4, NULL, NULL);
if(!r) {
ldns_key_free(k);
return NULL;
}
if (RSA_check_key(r) != 1) {
ldns_key_free(k);
return NULL;
}
ldns_key_set_rsa_key(k, r);
RSA_free(r);
#endif /* HAVE_EVP_PKEY_KEYGEN */
#endif /* HAVE_SSL */
break;
case LDNS_SIGN_DSA:
case LDNS_SIGN_DSA_NSEC3:
#ifdef USE_DSA
#ifdef HAVE_SSL
# if OPENSSL_VERSION_NUMBER < 0x00908000L
d = DSA_generate_parameters((int)size, NULL, 0, NULL, NULL, NULL, NULL);
if (!d) {
ldns_key_free(k);
return NULL;
}
# else
if (! (d = DSA_new())) {
ldns_key_free(k);
return NULL;
}
if (! DSA_generate_parameters_ex(d, (int)size, NULL, 0, NULL, NULL, NULL)) {
DSA_free(d);
ldns_key_free(k);
return NULL;
}
# endif
if (DSA_generate_key(d) != 1) {
ldns_key_free(k);
return NULL;
}
ldns_key_set_dsa_key(k, d);
DSA_free(d);
#endif /* HAVE_SSL */
#endif /* USE_DSA */
break;
case LDNS_SIGN_HMACMD5:
case LDNS_SIGN_HMACSHA1:
case LDNS_SIGN_HMACSHA224:
case LDNS_SIGN_HMACSHA256:
case LDNS_SIGN_HMACSHA384:
case LDNS_SIGN_HMACSHA512:
#ifdef HAVE_SSL
#ifndef S_SPLINT_S
k->_key.key = NULL;
#endif /* splint */
#endif /* HAVE_SSL */
size = size / 8;
ldns_key_set_hmac_size(k, size);
hmac = LDNS_XMALLOC(unsigned char, size);
if(!hmac) {
ldns_key_free(k);
return NULL;
}
#ifdef HAVE_SSL
if (RAND_bytes(hmac, (int) size) != 1) {
LDNS_FREE(hmac);
ldns_key_free(k);
return NULL;
}
#else
while (offset + sizeof(i) < size) {
i = random();
memcpy(&hmac[offset], &i, sizeof(i));
offset += sizeof(i);
}
if (offset < size) {
i = random();
memcpy(&hmac[offset], &i, size - offset);
}
#endif /* HAVE_SSL */
ldns_key_set_hmac_key(k, hmac);
ldns_key_set_flags(k, 0);
break;
case LDNS_SIGN_ECC_GOST:
#if defined(HAVE_SSL) && defined(USE_GOST)
ldns_key_set_evp_key(k, ldns_gen_gost_key());
#ifndef S_SPLINT_S
if(!k->_key.key) {
ldns_key_free(k);
return NULL;
}
#endif /* splint */
#else
ldns_key_free(k);
return NULL;
#endif /* HAVE_SSL and USE_GOST */
break;
case LDNS_SIGN_ECDSAP256SHA256:
case LDNS_SIGN_ECDSAP384SHA384:
#ifdef USE_ECDSA
if(alg == LDNS_SIGN_ECDSAP256SHA256)
ec = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
else if(alg == LDNS_SIGN_ECDSAP384SHA384)
ec = EC_KEY_new_by_curve_name(NID_secp384r1);
if(!ec) {
ldns_key_free(k);
return NULL;
}
if(!EC_KEY_generate_key(ec)) {
ldns_key_free(k);
EC_KEY_free(ec);
return NULL;
}
#ifndef S_SPLINT_S
k->_key.key = EVP_PKEY_new();
if(!k->_key.key) {
ldns_key_free(k);
EC_KEY_free(ec);
return NULL;
}
if (!EVP_PKEY_assign_EC_KEY(k->_key.key, ec)) {
ldns_key_free(k);
EC_KEY_free(ec);
return NULL;
}
#endif /* splint */
#else
ldns_key_free(k);
return NULL;
#endif /* ECDSA */
break;
#ifdef USE_ED25519
case LDNS_SIGN_ED25519:
#ifdef HAVE_EVP_PKEY_KEYGEN
ctx = EVP_PKEY_CTX_new_id(EVP_PKEY_EC, NULL);
if(!ctx) {
ldns_key_free(k);
return NULL;
}
if(EVP_PKEY_keygen_init(ctx) <= 0) {
ldns_key_free(k);
EVP_PKEY_CTX_free(ctx);
return NULL;
}
if (EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx,
NID_X25519) <= 0) {
ldns_key_free(k);
EVP_PKEY_CTX_free(ctx);
return NULL;
}
if (EVP_PKEY_keygen(ctx, &k->_key.key) <= 0) {
ldns_key_free(k);
EVP_PKEY_CTX_free(ctx);
return NULL;
}
EVP_PKEY_CTX_free(ctx);
#endif
break;
#endif /* ED25519 */
#ifdef USE_ED448
case LDNS_SIGN_ED448:
#ifdef HAVE_EVP_PKEY_KEYGEN
ctx = EVP_PKEY_CTX_new_id(EVP_PKEY_EC, NULL);
if(!ctx) {
ldns_key_free(k);
return NULL;
}
if(EVP_PKEY_keygen_init(ctx) <= 0) {
ldns_key_free(k);
EVP_PKEY_CTX_free(ctx);
return NULL;
}
if (EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx,
NID_X448) <= 0) {
ldns_key_free(k);
EVP_PKEY_CTX_free(ctx);
return NULL;
}
if (EVP_PKEY_keygen(ctx, &k->_key.key) <= 0) {
ldns_key_free(k);
EVP_PKEY_CTX_free(ctx);
return NULL;
}
EVP_PKEY_CTX_free(ctx);
#endif
break;
#endif /* ED448 */
}
ldns_key_set_algorithm(k, alg);
return k;
}
void
ldns_key_print(FILE *output, const ldns_key *k)
{
char *str = ldns_key2str(k);
if (str) {
fprintf(output, "%s", str);
} else {
fprintf(output, "Unable to convert private key to string\n");
}
LDNS_FREE(str);
}
void
ldns_key_set_algorithm(ldns_key *k, ldns_signing_algorithm l)
{
k->_alg = l;
}
void
ldns_key_set_flags(ldns_key *k, uint16_t f)
{
k->_extra.dnssec.flags = f;
}
#ifdef HAVE_SSL
#ifndef S_SPLINT_S
void
ldns_key_set_evp_key(ldns_key *k, EVP_PKEY *e)
{
k->_key.key = e;
}
void
ldns_key_set_rsa_key(ldns_key *k, RSA *r)
{
EVP_PKEY *key = EVP_PKEY_new();
EVP_PKEY_set1_RSA(key, r);
k->_key.key = key;
}
void
ldns_key_set_dsa_key(ldns_key *k, DSA *d)
{
#ifdef USE_DSA
EVP_PKEY *key = EVP_PKEY_new();
EVP_PKEY_set1_DSA(key, d);
k->_key.key = key;
#else
(void)k; (void)d;
#endif
}
void
ldns_key_assign_rsa_key(ldns_key *k, RSA *r)
{
EVP_PKEY *key = EVP_PKEY_new();
EVP_PKEY_assign_RSA(key, r);
k->_key.key = key;
}
void
ldns_key_assign_dsa_key(ldns_key *k, DSA *d)
{
#ifdef USE_DSA
EVP_PKEY *key = EVP_PKEY_new();
EVP_PKEY_assign_DSA(key, d);
k->_key.key = key;
#else
(void)k; (void)d;
#endif
}
#endif /* splint */
#endif /* HAVE_SSL */
void
ldns_key_set_hmac_key(ldns_key *k, unsigned char *hmac)
{
k->_key.hmac.key = hmac;
}
void
ldns_key_set_hmac_size(ldns_key *k, size_t hmac_size)
{
k->_key.hmac.size = hmac_size;
}
void
ldns_key_set_external_key(ldns_key *k, void *external_key)
{
k->_key.external_key = external_key;
}
void
ldns_key_set_origttl(ldns_key *k, uint32_t t)
{
k->_extra.dnssec.orig_ttl = t;
}
void
ldns_key_set_inception(ldns_key *k, uint32_t i)
{
k->_extra.dnssec.inception = i;
}
void
ldns_key_set_expiration(ldns_key *k, uint32_t e)
{
k->_extra.dnssec.expiration = e;
}
void
ldns_key_set_pubkey_owner(ldns_key *k, ldns_rdf *r)
{
k->_pubkey_owner = r;
}
void
ldns_key_set_keytag(ldns_key *k, uint16_t tag)
{
k->_extra.dnssec.keytag = tag;
}
/* read */
size_t
ldns_key_list_key_count(const ldns_key_list *key_list)
{
return key_list->_key_count;
}
ldns_key *
ldns_key_list_key(const ldns_key_list *key, size_t nr)
{
if (nr < ldns_key_list_key_count(key)) {
return key->_keys[nr];
} else {
return NULL;
}
}
ldns_signing_algorithm
ldns_key_algorithm(const ldns_key *k)
{
return k->_alg;
}
void
ldns_key_set_use(ldns_key *k, bool v)
{
if (k) {
k->_use = v;
}
}
bool
ldns_key_use(const ldns_key *k)
{
if (k) {
return k->_use;
}
return false;
}
#ifdef HAVE_SSL
#ifndef S_SPLINT_S
EVP_PKEY *
ldns_key_evp_key(const ldns_key *k)
{
return k->_key.key;
}
RSA *
ldns_key_rsa_key(const ldns_key *k)
{
if (k->_key.key) {
return EVP_PKEY_get1_RSA(k->_key.key);
} else {
return NULL;
}
}
DSA *
ldns_key_dsa_key(const ldns_key *k)
{
#ifdef USE_DSA
if (k->_key.key) {
return EVP_PKEY_get1_DSA(k->_key.key);
} else {
return NULL;
}
#else
(void)k;
return NULL;
#endif
}
#endif /* splint */
#endif /* HAVE_SSL */
unsigned char *
ldns_key_hmac_key(const ldns_key *k)
{
if (k->_key.hmac.key) {
return k->_key.hmac.key;
} else {
return NULL;
}
}
size_t
ldns_key_hmac_size(const ldns_key *k)
{
if (k->_key.hmac.size) {
return k->_key.hmac.size;
} else {
return 0;
}
}
void *
ldns_key_external_key(const ldns_key *k)
{
return k->_key.external_key;
}
uint32_t
ldns_key_origttl(const ldns_key *k)
{
return k->_extra.dnssec.orig_ttl;
}
uint16_t
ldns_key_flags(const ldns_key *k)
{
return k->_extra.dnssec.flags;
}
uint32_t
ldns_key_inception(const ldns_key *k)
{
return k->_extra.dnssec.inception;
}
uint32_t
ldns_key_expiration(const ldns_key *k)
{
return k->_extra.dnssec.expiration;
}
uint16_t
ldns_key_keytag(const ldns_key *k)
{
return k->_extra.dnssec.keytag;
}
ldns_rdf *
ldns_key_pubkey_owner(const ldns_key *k)
{
return k->_pubkey_owner;
}
/* write */
void
ldns_key_list_set_use(ldns_key_list *keys, bool v)
{
size_t i;
for (i = 0; i < ldns_key_list_key_count(keys); i++) {
ldns_key_set_use(ldns_key_list_key(keys, i), v);
}
}
void
ldns_key_list_set_key_count(ldns_key_list *key, size_t count)
{
key->_key_count = count;
}
bool
ldns_key_list_push_key(ldns_key_list *key_list, ldns_key *key)
{
size_t key_count;
ldns_key **keys;
key_count = ldns_key_list_key_count(key_list);
/* grow the array */
keys = LDNS_XREALLOC(
key_list->_keys, ldns_key *, key_count + 1);
if (!keys) {
return false;
}
/* add the new member */
key_list->_keys = keys;
key_list->_keys[key_count] = key;
ldns_key_list_set_key_count(key_list, key_count + 1);
return true;
}
ldns_key *
ldns_key_list_pop_key(ldns_key_list *key_list)
{
size_t key_count;
ldns_key** a;
ldns_key *pop;
if (!key_list) {
return NULL;
}
key_count = ldns_key_list_key_count(key_list);
if (key_count == 0) {
return NULL;
}
pop = ldns_key_list_key(key_list, key_count);
/* shrink the array */
a = LDNS_XREALLOC(key_list->_keys, ldns_key *, key_count - 1);
if(a) {
key_list->_keys = a;
}
ldns_key_list_set_key_count(key_list, key_count - 1);
return pop;
}
#ifdef HAVE_SSL
#ifndef S_SPLINT_S
/* data pointer must be large enough (LDNS_MAX_KEYLEN) */
static bool
ldns_key_rsa2bin(unsigned char *data, RSA *k, uint16_t *size)
{
int i,j;
const BIGNUM *n=NULL, *e=NULL;
if (!k) {
return false;
}
#if OPENSSL_VERSION_NUMBER < 0x10100000 || defined(HAVE_LIBRESSL)
n = k->n;
e = k->e;
#else
RSA_get0_key(k, &n, &e, NULL);
#endif
if (BN_num_bytes(e) <= 256) {
/* normally only this path is executed (small factors are
* more common
*/
data[0] = (unsigned char) BN_num_bytes(e);
i = BN_bn2bin(e, data + 1);
j = BN_bn2bin(n, data + i + 1);
*size = (uint16_t) i + j;
} else if (BN_num_bytes(e) <= 65536) {
data[0] = 0;
/* BN_bn2bin does bigendian, _uint16 also */
ldns_write_uint16(data + 1, (uint16_t) BN_num_bytes(e));
BN_bn2bin(e, data + 3);
BN_bn2bin(n, data + 4 + BN_num_bytes(e));
*size = (uint16_t) BN_num_bytes(n) + 6;
} else {
return false;
}
return true;
}
#ifdef USE_DSA
/* data pointer must be large enough (LDNS_MAX_KEYLEN) */
static bool
ldns_key_dsa2bin(unsigned char *data, DSA *k, uint16_t *size)
{
uint8_t T;
const BIGNUM *p, *q, *g;
const BIGNUM *pub_key, *priv_key;
if (!k) {
return false;
}
/* See RFC2536 */
# ifdef HAVE_DSA_GET0_PQG
DSA_get0_pqg(k, &p, &q, &g);
# else
p = k->p; q = k->q; g = k->g;
# endif
# ifdef HAVE_DSA_GET0_KEY
DSA_get0_key(k, &pub_key, &priv_key);
# else
pub_key = k->pub_key; priv_key = k->priv_key;
# endif
(void)priv_key;
*size = (uint16_t)BN_num_bytes(p);
T = (*size - 64) / 8;
if (T > 8) {
#ifdef STDERR_MSGS
fprintf(stderr, "DSA key with T > 8 (ie. > 1024 bits)");
fprintf(stderr, " not implemented\n");
#endif
return false;
}
/* size = 64 + (T * 8); */
memset(data, 0, 21 + *size * 3);
data[0] = (unsigned char)T;
BN_bn2bin(q, data + 1 ); /* 20 octects */
BN_bn2bin(p, data + 21 ); /* offset octects */
BN_bn2bin(g, data + 21 + *size * 2 - BN_num_bytes(g));
BN_bn2bin(pub_key,data + 21 + *size * 3 - BN_num_bytes(pub_key));
*size = 21 + *size * 3;
return true;
}
#endif /* USE_DSA */
#ifdef USE_GOST
static bool
ldns_key_gost2bin(unsigned char* data, EVP_PKEY* k, uint16_t* size)
{
int i;
unsigned char* pp = NULL;
if(i2d_PUBKEY(k, &pp) != 37 + 64) {
/* expect 37 byte(ASN header) and 64 byte(X and Y) */
free(pp);
return false;
}
/* omit ASN header */
for(i=0; i<64; i++)
data[i] = pp[i+37];
free(pp);
*size = 64;
return true;
}
#endif /* USE_GOST */
#endif /* splint */
#endif /* HAVE_SSL */
ldns_rr *
ldns_key2rr(const ldns_key *k)
{
/* this function will convert a the keydata contained in
* rsa/dsa pointers to a DNSKEY rr. It will fill in as
* much as it can, but it does not know about key-flags
* for instance
*/
ldns_rr *pubkey;
ldns_rdf *keybin;
unsigned char *bin = NULL;
uint16_t size = 0;
#ifdef HAVE_SSL
RSA *rsa = NULL;
#ifdef USE_DSA
DSA *dsa = NULL;
#endif /* USE_DSA */
#endif /* HAVE_SSL */
#ifdef USE_ECDSA
EC_KEY* ec;
#endif
int internal_data = 0;
if (!k) {
return NULL;
}
pubkey = ldns_rr_new();
switch (ldns_key_algorithm(k)) {
case LDNS_SIGN_HMACMD5:
case LDNS_SIGN_HMACSHA1:
case LDNS_SIGN_HMACSHA224:
case LDNS_SIGN_HMACSHA256:
case LDNS_SIGN_HMACSHA384:
case LDNS_SIGN_HMACSHA512:
ldns_rr_set_type(pubkey, LDNS_RR_TYPE_KEY);
break;
default:
ldns_rr_set_type(pubkey, LDNS_RR_TYPE_DNSKEY);
break;
}
/* zero-th rdf - flags */
ldns_rr_push_rdf(pubkey,
ldns_native2rdf_int16(LDNS_RDF_TYPE_INT16,
ldns_key_flags(k)));
/* first - proto */
ldns_rr_push_rdf(pubkey,
ldns_native2rdf_int8(LDNS_RDF_TYPE_INT8, LDNS_DNSSEC_KEYPROTO));
if (ldns_key_pubkey_owner(k)) {
ldns_rr_set_owner(pubkey, ldns_rdf_clone(ldns_key_pubkey_owner(k)));
}
/* third - da algorithm */
switch(ldns_key_algorithm(k)) {
case LDNS_SIGN_RSAMD5:
case LDNS_SIGN_RSASHA1:
case LDNS_SIGN_RSASHA1_NSEC3:
case LDNS_SIGN_RSASHA256:
case LDNS_SIGN_RSASHA512:
ldns_rr_push_rdf(pubkey,
ldns_native2rdf_int8(LDNS_RDF_TYPE_ALG, ldns_key_algorithm(k)));
#ifdef HAVE_SSL
rsa = ldns_key_rsa_key(k);
if (rsa) {
bin = LDNS_XMALLOC(unsigned char, LDNS_MAX_KEYLEN);
if (!bin) {
ldns_rr_free(pubkey);
return NULL;
}
if (!ldns_key_rsa2bin(bin, rsa, &size)) {
LDNS_FREE(bin);
ldns_rr_free(pubkey);
return NULL;
}
RSA_free(rsa);
internal_data = 1;
}
#endif
size++;
break;
case LDNS_SIGN_DSA:
ldns_rr_push_rdf(pubkey,
ldns_native2rdf_int8(LDNS_RDF_TYPE_ALG, LDNS_DSA));
#ifdef USE_DSA
#ifdef HAVE_SSL
dsa = ldns_key_dsa_key(k);
if (dsa) {
bin = LDNS_XMALLOC(unsigned char, LDNS_MAX_KEYLEN);
if (!bin) {
ldns_rr_free(pubkey);
return NULL;
}
if (!ldns_key_dsa2bin(bin, dsa, &size)) {
LDNS_FREE(bin);
ldns_rr_free(pubkey);
return NULL;
}
DSA_free(dsa);
internal_data = 1;
}
#endif /* HAVE_SSL */
#endif /* USE_DSA */
break;
case LDNS_SIGN_DSA_NSEC3:
ldns_rr_push_rdf(pubkey,
ldns_native2rdf_int8(LDNS_RDF_TYPE_ALG, LDNS_DSA_NSEC3));
#ifdef USE_DSA
#ifdef HAVE_SSL
dsa = ldns_key_dsa_key(k);
if (dsa) {
bin = LDNS_XMALLOC(unsigned char, LDNS_MAX_KEYLEN);
if (!bin) {
ldns_rr_free(pubkey);
return NULL;
}
if (!ldns_key_dsa2bin(bin, dsa, &size)) {
LDNS_FREE(bin);
ldns_rr_free(pubkey);
return NULL;
}
DSA_free(dsa);
internal_data = 1;
}
#endif /* HAVE_SSL */
#endif /* USE_DSA */
break;
case LDNS_SIGN_ECC_GOST:
ldns_rr_push_rdf(pubkey, ldns_native2rdf_int8(
LDNS_RDF_TYPE_ALG, ldns_key_algorithm(k)));
#if defined(HAVE_SSL) && defined(USE_GOST)
bin = LDNS_XMALLOC(unsigned char, LDNS_MAX_KEYLEN);
if (!bin) {
ldns_rr_free(pubkey);
return NULL;
}
#ifndef S_SPLINT_S
if (!ldns_key_gost2bin(bin, k->_key.key, &size)) {
LDNS_FREE(bin);
ldns_rr_free(pubkey);
return NULL;
}
#endif /* splint */
internal_data = 1;
#else
ldns_rr_free(pubkey);
return NULL;
#endif /* HAVE_SSL and USE_GOST */
break;
case LDNS_SIGN_ECDSAP256SHA256:
case LDNS_SIGN_ECDSAP384SHA384:
#ifdef USE_ECDSA
ldns_rr_push_rdf(pubkey, ldns_native2rdf_int8(
LDNS_RDF_TYPE_ALG, ldns_key_algorithm(k)));
bin = NULL;
#ifndef S_SPLINT_S
ec = EVP_PKEY_get1_EC_KEY(k->_key.key);
#endif
EC_KEY_set_conv_form(ec, POINT_CONVERSION_UNCOMPRESSED);
size = (uint16_t)i2o_ECPublicKey(ec, NULL);
if(!i2o_ECPublicKey(ec, &bin)) {
EC_KEY_free(ec);
ldns_rr_free(pubkey);
return NULL;
}
if(size > 1) {
/* move back one byte to shave off the 0x02
* 'uncompressed' indicator that openssl made
* Actually its 0x04 (from implementation).
*/
assert(bin[0] == POINT_CONVERSION_UNCOMPRESSED);
size -= 1;
memmove(bin, bin+1, size);
}
/* down the reference count for ec, its still assigned
* to the pkey */
EC_KEY_free(ec);
internal_data = 1;
#else
ldns_rr_free(pubkey);
return NULL;
#endif /* ECDSA */
break;
#ifdef USE_ED25519
case LDNS_SIGN_ED25519:
ldns_rr_push_rdf(pubkey, ldns_native2rdf_int8(
LDNS_RDF_TYPE_ALG, ldns_key_algorithm(k)));
bin = NULL;
ec = EVP_PKEY_get1_EC_KEY(k->_key.key);
EC_KEY_set_conv_form(ec, POINT_CONVERSION_UNCOMPRESSED);
size = (uint16_t)i2o_ECPublicKey(ec, NULL);
if(!i2o_ECPublicKey(ec, &bin)) {
EC_KEY_free(ec);
ldns_rr_free(pubkey);
return NULL;
}
/* down the reference count for ec, its still assigned
* to the pkey */
EC_KEY_free(ec);
internal_data = 1;
break;
#endif
#ifdef USE_ED448
case LDNS_SIGN_ED448:
ldns_rr_push_rdf(pubkey, ldns_native2rdf_int8(
LDNS_RDF_TYPE_ALG, ldns_key_algorithm(k)));
bin = NULL;
ec = EVP_PKEY_get1_EC_KEY(k->_key.key);
EC_KEY_set_conv_form(ec, POINT_CONVERSION_UNCOMPRESSED);
size = (uint16_t)i2o_ECPublicKey(ec, NULL);
if(!i2o_ECPublicKey(ec, &bin)) {
EC_KEY_free(ec);
ldns_rr_free(pubkey);
return NULL;
}
/* down the reference count for ec, its still assigned
* to the pkey */
EC_KEY_free(ec);
internal_data = 1;
break;
#endif
case LDNS_SIGN_HMACMD5:
case LDNS_SIGN_HMACSHA1:
case LDNS_SIGN_HMACSHA224:
case LDNS_SIGN_HMACSHA256:
case LDNS_SIGN_HMACSHA384:
case LDNS_SIGN_HMACSHA512:
bin = LDNS_XMALLOC(unsigned char, ldns_key_hmac_size(k));
if (!bin) {
ldns_rr_free(pubkey);
return NULL;
}
ldns_rr_push_rdf(pubkey,
ldns_native2rdf_int8(LDNS_RDF_TYPE_ALG,
ldns_key_algorithm(k)));
size = ldns_key_hmac_size(k);
memcpy(bin, ldns_key_hmac_key(k), size);
internal_data = 1;
break;
}
/* fourth the key bin material */
if (internal_data) {
keybin = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_B64, size, bin);
LDNS_FREE(bin);
ldns_rr_push_rdf(pubkey, keybin);
}
return pubkey;
}
void
ldns_key_free(ldns_key *key)
{
LDNS_FREE(key);
}
void
ldns_key_deep_free(ldns_key *key)
{
unsigned char* hmac;
if (ldns_key_pubkey_owner(key)) {
ldns_rdf_deep_free(ldns_key_pubkey_owner(key));
}
#ifdef HAVE_SSL
if (ldns_key_evp_key(key)) {
EVP_PKEY_free(ldns_key_evp_key(key));
}
#endif /* HAVE_SSL */
if (ldns_key_hmac_key(key)) {
hmac = ldns_key_hmac_key(key);
LDNS_FREE(hmac);
}
LDNS_FREE(key);
}
void
ldns_key_list_free(ldns_key_list *key_list)
{
size_t i;
for (i = 0; i < ldns_key_list_key_count(key_list); i++) {
ldns_key_deep_free(ldns_key_list_key(key_list, i));
}
LDNS_FREE(key_list->_keys);
LDNS_FREE(key_list);
}
ldns_rr *
ldns_read_anchor_file(const char *filename)
{
FILE *fp;
/*char line[LDNS_MAX_PACKETLEN];*/
char *line = LDNS_XMALLOC(char, LDNS_MAX_PACKETLEN);
int c;
size_t i = 0;
ldns_rr *r;
ldns_status status;
if(!line) {
return NULL;
}
fp = fopen(filename, "r");
if (!fp) {
#ifdef STDERR_MSGS
fprintf(stderr, "Unable to open %s: %s\n", filename, strerror(errno));
#endif
LDNS_FREE(line);
return NULL;
}
while ((c = fgetc(fp)) && i+1 < LDNS_MAX_PACKETLEN && c != EOF) {
line[i] = c;
i++;
}
line[i] = '\0';
fclose(fp);
if (i <= 0) {
#ifdef STDERR_MSGS
fprintf(stderr, "nothing read from %s", filename);
#endif
LDNS_FREE(line);
return NULL;
} else {
status = ldns_rr_new_frm_str(&r, line, 0, NULL, NULL);
if (status == LDNS_STATUS_OK && (ldns_rr_get_type(r) == LDNS_RR_TYPE_DNSKEY || ldns_rr_get_type(r) == LDNS_RR_TYPE_DS)) {
LDNS_FREE(line);
return r;
} else {
#ifdef STDERR_MSGS
fprintf(stderr, "Error creating DNSKEY or DS rr from %s: %s\n", filename, ldns_get_errorstr_by_id(status));
#endif
LDNS_FREE(line);
return NULL;
}
}
}
char *
ldns_key_get_file_base_name(const ldns_key *key)
{
ldns_buffer *buffer;
char *file_base_name;
buffer = ldns_buffer_new(255);
ldns_buffer_printf(buffer, "K");
(void)ldns_rdf2buffer_str_dname(buffer, ldns_key_pubkey_owner(key));
ldns_buffer_printf(buffer,
"+%03u+%05u",
ldns_key_algorithm(key),
ldns_key_keytag(key));
file_base_name = ldns_buffer_export(buffer);
ldns_buffer_free(buffer);
return file_base_name;
}
int ldns_key_algo_supported(int algo)
{
ldns_lookup_table *lt = ldns_signing_algorithms;
while(lt->name) {
if(lt->id == algo)
return 1;
lt++;
}
return 0;
}
ldns_signing_algorithm ldns_get_signing_algorithm_by_name(const char* name)
{
/* list of (signing algorithm id, alias_name) */
ldns_lookup_table aliases[] = {
/* from bind dnssec-keygen */
{LDNS_SIGN_HMACMD5, "HMAC-MD5"},
{LDNS_SIGN_DSA_NSEC3, "NSEC3DSA"},
{LDNS_SIGN_RSASHA1_NSEC3, "NSEC3RSASHA1"},
/* old ldns usage, now RFC names */
#ifdef USE_DSA
{LDNS_SIGN_DSA_NSEC3, "DSA_NSEC3" },
#endif
{LDNS_SIGN_RSASHA1_NSEC3, "RSASHA1_NSEC3" },
#ifdef USE_GOST
{LDNS_SIGN_ECC_GOST, "GOST"},
#endif
/* compat with possible output */
{LDNS_DH, "DH"},
{LDNS_ECC, "ECC"},
{LDNS_INDIRECT, "INDIRECT"},
{LDNS_PRIVATEDNS, "PRIVATEDNS"},
{LDNS_PRIVATEOID, "PRIVATEOID"},
{0, NULL}};
ldns_lookup_table* lt = ldns_signing_algorithms;
ldns_signing_algorithm a;
char *endptr;
while(lt->name) {
if(strcasecmp(lt->name, name) == 0)
return lt->id;
lt++;
}
lt = aliases;
while(lt->name) {
if(strcasecmp(lt->name, name) == 0)
return lt->id;
lt++;
}
a = strtol(name, &endptr, 10);
if (*name && !*endptr)
return a;
return 0;
}
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