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heimdal/lib/krb5/pkinit.c
Love Hörnquist Åstrand 6dbf91d7e3 send supportedCMSTypes 
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@24217 ec53bebd-3082-4978-b11e-865c3cabbd6b
2008-12-18 05:01:15 +00:00

2189 lines
53 KiB
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/*
* Copyright (c) 2003 - 2007 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "krb5_locl.h"
RCSID("$Id$");
struct krb5_dh_moduli {
char *name;
unsigned long bits;
heim_integer p;
heim_integer g;
heim_integer q;
};
#ifdef PKINIT
#include <cms_asn1.h>
#include <pkcs8_asn1.h>
#include <pkcs9_asn1.h>
#include <pkcs12_asn1.h>
#include <pkinit_asn1.h>
#include <asn1_err.h>
#include <der.h>
struct krb5_pk_cert {
hx509_cert cert;
};
struct krb5_pk_init_ctx_data {
struct krb5_pk_identity *id;
DH *dh;
krb5_data *clientDHNonce;
struct krb5_dh_moduli **m;
hx509_peer_info peer;
enum krb5_pk_type type;
unsigned int require_binding:1;
unsigned int require_eku:1;
unsigned int require_krbtgt_otherName:1;
unsigned int require_hostname_match:1;
unsigned int trustedCertifiers:1;
};
static void
pk_copy_error(krb5_context context,
hx509_context hx509ctx,
int hxret,
const char *fmt,
...)
__attribute__ ((format (printf, 4, 5)));
/*
*
*/
void KRB5_LIB_FUNCTION
_krb5_pk_cert_free(struct krb5_pk_cert *cert)
{
if (cert->cert) {
hx509_cert_free(cert->cert);
}
free(cert);
}
static krb5_error_code
BN_to_integer(krb5_context context, BIGNUM *bn, heim_integer *integer)
{
integer->length = BN_num_bytes(bn);
integer->data = malloc(integer->length);
if (integer->data == NULL) {
krb5_clear_error_message(context);
return ENOMEM;
}
BN_bn2bin(bn, integer->data);
integer->negative = BN_is_negative(bn);
return 0;
}
static BIGNUM *
integer_to_BN(krb5_context context, const char *field, const heim_integer *f)
{
BIGNUM *bn;
bn = BN_bin2bn((const unsigned char *)f->data, f->length, NULL);
if (bn == NULL) {
krb5_set_error_message(context, ENOMEM,
N_("PKINIT: parsing BN failed %s", ""), field);
return NULL;
}
BN_set_negative(bn, f->negative);
return bn;
}
struct certfind {
const char *type;
const heim_oid *oid;
};
/*
* Try searchin the key by to use by first looking for for PK-INIT
* EKU, then the Microsoft smart card EKU and last, no special EKU at all.
*/
static krb5_error_code
find_cert(krb5_context context, struct krb5_pk_identity *id,
hx509_query *q, hx509_cert *cert)
{
struct certfind cf[3] = {
{ "PKINIT EKU" },
{ "MS EKU" },
{ "any (or no)" }
};
int i, ret;
cf[0].oid = oid_id_pkekuoid();
cf[1].oid = oid_id_pkinit_ms_eku();
cf[2].oid = NULL;
for (i = 0; i < sizeof(cf)/sizeof(cf[0]); i++) {
ret = hx509_query_match_eku(q, cf[i].oid);
if (ret) {
pk_copy_error(context, id->hx509ctx, ret,
"Failed setting %s OID", cf[i].type);
return ret;
}
ret = hx509_certs_find(id->hx509ctx, id->certs, q, cert);
if (ret == 0)
break;
pk_copy_error(context, id->hx509ctx, ret,
"Failed finding certificate with %s OID", cf[i].type);
}
return ret;
}
static krb5_error_code
create_signature(krb5_context context,
const heim_oid *eContentType,
krb5_data *eContent,
struct krb5_pk_identity *id,
hx509_peer_info peer,
krb5_data *sd_data)
{
hx509_cert cert = NULL;
hx509_query *q = NULL;
int ret;
ret = hx509_query_alloc(id->hx509ctx, &q);
if (ret) {
pk_copy_error(context, id->hx509ctx, ret,
"Allocate query to find signing certificate");
return ret;
}
hx509_query_match_option(q, HX509_QUERY_OPTION_PRIVATE_KEY);
hx509_query_match_option(q, HX509_QUERY_OPTION_KU_DIGITALSIGNATURE);
ret = find_cert(context, id, q, &cert);
hx509_query_free(id->hx509ctx, q);
if (ret)
return ret;
ret = hx509_cms_create_signed_1(id->hx509ctx,
0,
eContentType,
eContent->data,
eContent->length,
NULL,
cert,
peer,
NULL,
id->certs,
sd_data);
hx509_cert_free(cert);
if (ret) {
pk_copy_error(context, id->hx509ctx, ret,
"Create CMS signedData");
return ret;
}
return 0;
}
static int
cert2epi(hx509_context context, void *ctx, hx509_cert c)
{
ExternalPrincipalIdentifiers *ids = ctx;
ExternalPrincipalIdentifier id;
hx509_name subject = NULL;
void *p;
int ret;
memset(&id, 0, sizeof(id));
ret = hx509_cert_get_subject(c, &subject);
if (ret)
return ret;
if (hx509_name_is_null_p(subject) != 0) {
id.subjectName = calloc(1, sizeof(*id.subjectName));
if (id.subjectName == NULL) {
hx509_name_free(&subject);
free_ExternalPrincipalIdentifier(&id);
return ENOMEM;
}
ret = hx509_name_binary(subject, id.subjectName);
if (ret) {
hx509_name_free(&subject);
free_ExternalPrincipalIdentifier(&id);
return ret;
}
}
hx509_name_free(&subject);
id.issuerAndSerialNumber = calloc(1, sizeof(*id.issuerAndSerialNumber));
if (id.issuerAndSerialNumber == NULL) {
free_ExternalPrincipalIdentifier(&id);
return ENOMEM;
}
{
IssuerAndSerialNumber iasn;
hx509_name issuer;
size_t size;
memset(&iasn, 0, sizeof(iasn));
ret = hx509_cert_get_issuer(c, &issuer);
if (ret) {
free_ExternalPrincipalIdentifier(&id);
return ret;
}
ret = hx509_name_to_Name(issuer, &iasn.issuer);
hx509_name_free(&issuer);
if (ret) {
free_ExternalPrincipalIdentifier(&id);
return ret;
}
ret = hx509_cert_get_serialnumber(c, &iasn.serialNumber);
if (ret) {
free_IssuerAndSerialNumber(&iasn);
free_ExternalPrincipalIdentifier(&id);
return ret;
}
ASN1_MALLOC_ENCODE(IssuerAndSerialNumber,
id.issuerAndSerialNumber->data,
id.issuerAndSerialNumber->length,
&iasn, &size, ret);
free_IssuerAndSerialNumber(&iasn);
if (ret)
return ret;
if (id.issuerAndSerialNumber->length != size)
abort();
}
id.subjectKeyIdentifier = NULL;
p = realloc(ids->val, sizeof(ids->val[0]) * (ids->len + 1));
if (p == NULL) {
free_ExternalPrincipalIdentifier(&id);
return ENOMEM;
}
ids->val = p;
ids->val[ids->len] = id;
ids->len++;
return 0;
}
static krb5_error_code
build_edi(krb5_context context,
hx509_context hx509ctx,
hx509_certs certs,
ExternalPrincipalIdentifiers *ids)
{
return hx509_certs_iter(hx509ctx, certs, cert2epi, ids);
}
static krb5_error_code
build_auth_pack(krb5_context context,
unsigned nonce,
krb5_pk_init_ctx ctx,
DH *dh,
const KDC_REQ_BODY *body,
AuthPack *a)
{
size_t buf_size, len;
krb5_error_code ret;
void *buf;
krb5_timestamp sec;
int32_t usec;
Checksum checksum;
krb5_clear_error_message(context);
memset(&checksum, 0, sizeof(checksum));
krb5_us_timeofday(context, &sec, &usec);
a->pkAuthenticator.ctime = sec;
a->pkAuthenticator.nonce = nonce;
ASN1_MALLOC_ENCODE(KDC_REQ_BODY, buf, buf_size, body, &len, ret);
if (ret)
return ret;
if (buf_size != len)
krb5_abortx(context, "internal error in ASN.1 encoder");
ret = krb5_create_checksum(context,
NULL,
0,
CKSUMTYPE_SHA1,
buf,
len,
&checksum);
free(buf);
if (ret)
return ret;
ALLOC(a->pkAuthenticator.paChecksum, 1);
if (a->pkAuthenticator.paChecksum == NULL) {
krb5_set_error_message(context, ENOMEM,
N_("malloc: out of memory", ""));
return ENOMEM;
}
ret = krb5_data_copy(a->pkAuthenticator.paChecksum,
checksum.checksum.data, checksum.checksum.length);
free_Checksum(&checksum);
if (ret)
return ret;
if (dh) {
DomainParameters dp;
heim_integer dh_pub_key;
krb5_data dhbuf;
size_t size;
if (1 /* support_cached_dh */) {
ALLOC(a->clientDHNonce, 1);
if (a->clientDHNonce == NULL) {
krb5_clear_error_message(context);
return ENOMEM;
}
ret = krb5_data_alloc(a->clientDHNonce, 40);
if (a->clientDHNonce == NULL) {
krb5_clear_error_message(context);
return ret;
}
RAND_bytes(a->clientDHNonce->data, a->clientDHNonce->length);
ret = krb5_copy_data(context, a->clientDHNonce,
&ctx->clientDHNonce);
if (ret)
return ret;
}
ALLOC(a->clientPublicValue, 1);
if (a->clientPublicValue == NULL)
return ENOMEM;
ret = der_copy_oid(oid_id_dhpublicnumber(),
&a->clientPublicValue->algorithm.algorithm);
if (ret)
return ret;
memset(&dp, 0, sizeof(dp));
ret = BN_to_integer(context, dh->p, &dp.p);
if (ret) {
free_DomainParameters(&dp);
return ret;
}
ret = BN_to_integer(context, dh->g, &dp.g);
if (ret) {
free_DomainParameters(&dp);
return ret;
}
ret = BN_to_integer(context, dh->q, &dp.q);
if (ret) {
free_DomainParameters(&dp);
return ret;
}
dp.j = NULL;
dp.validationParms = NULL;
a->clientPublicValue->algorithm.parameters =
malloc(sizeof(*a->clientPublicValue->algorithm.parameters));
if (a->clientPublicValue->algorithm.parameters == NULL) {
free_DomainParameters(&dp);
return ret;
}
ASN1_MALLOC_ENCODE(DomainParameters,
a->clientPublicValue->algorithm.parameters->data,
a->clientPublicValue->algorithm.parameters->length,
&dp, &size, ret);
free_DomainParameters(&dp);
if (ret)
return ret;
if (size != a->clientPublicValue->algorithm.parameters->length)
krb5_abortx(context, "Internal ASN1 encoder error");
ret = BN_to_integer(context, dh->pub_key, &dh_pub_key);
if (ret)
return ret;
ASN1_MALLOC_ENCODE(DHPublicKey, dhbuf.data, dhbuf.length,
&dh_pub_key, &size, ret);
der_free_heim_integer(&dh_pub_key);
if (ret)
return ret;
if (size != dhbuf.length)
krb5_abortx(context, "asn1 internal error");
a->clientPublicValue->subjectPublicKey.length = dhbuf.length * 8;
a->clientPublicValue->subjectPublicKey.data = dhbuf.data;
}
{
a->supportedCMSTypes = calloc(1, sizeof(*a->supportedCMSTypes));
if (a->supportedCMSTypes == NULL)
return ENOMEM;
ret = hx509_crypto_available(ctx->id->hx509ctx, HX509_SELECT_ALL, NULL,
&a->supportedCMSTypes->val,
&a->supportedCMSTypes->len);
if (ret)
return ret;
}
return ret;
}
krb5_error_code KRB5_LIB_FUNCTION
_krb5_pk_mk_ContentInfo(krb5_context context,
const krb5_data *buf,
const heim_oid *oid,
struct ContentInfo *content_info)
{
krb5_error_code ret;
ret = der_copy_oid(oid, &content_info->contentType);
if (ret)
return ret;
ALLOC(content_info->content, 1);
if (content_info->content == NULL)
return ENOMEM;
content_info->content->data = malloc(buf->length);
if (content_info->content->data == NULL)
return ENOMEM;
memcpy(content_info->content->data, buf->data, buf->length);
content_info->content->length = buf->length;
return 0;
}
static krb5_error_code
pk_mk_padata(krb5_context context,
krb5_pk_init_ctx ctx,
const KDC_REQ_BODY *req_body,
unsigned nonce,
METHOD_DATA *md)
{
struct ContentInfo content_info;
krb5_error_code ret;
const heim_oid *oid;
size_t size;
krb5_data buf, sd_buf;
int pa_type;
krb5_data_zero(&buf);
krb5_data_zero(&sd_buf);
memset(&content_info, 0, sizeof(content_info));
if (ctx->type == PKINIT_WIN2K) {
AuthPack_Win2k ap;
krb5_timestamp sec;
int32_t usec;
memset(&ap, 0, sizeof(ap));
/* fill in PKAuthenticator */
ret = copy_PrincipalName(req_body->sname, &ap.pkAuthenticator.kdcName);
if (ret) {
free_AuthPack_Win2k(&ap);
krb5_clear_error_message(context);
goto out;
}
ret = copy_Realm(&req_body->realm, &ap.pkAuthenticator.kdcRealm);
if (ret) {
free_AuthPack_Win2k(&ap);
krb5_clear_error_message(context);
goto out;
}
krb5_us_timeofday(context, &sec, &usec);
ap.pkAuthenticator.ctime = sec;
ap.pkAuthenticator.cusec = usec;
ap.pkAuthenticator.nonce = nonce;
ASN1_MALLOC_ENCODE(AuthPack_Win2k, buf.data, buf.length,
&ap, &size, ret);
free_AuthPack_Win2k(&ap);
if (ret) {
krb5_set_error_message(context, ret,
N_("Failed encoding AuthPackWin: %d", ""),
(int)ret);
goto out;
}
if (buf.length != size)
krb5_abortx(context, "internal ASN1 encoder error");
oid = oid_id_pkcs7_data();
} else if (ctx->type == PKINIT_27) {
AuthPack ap;
memset(&ap, 0, sizeof(ap));
ret = build_auth_pack(context, nonce, ctx, ctx->dh, req_body, &ap);
if (ret) {
free_AuthPack(&ap);
goto out;
}
ASN1_MALLOC_ENCODE(AuthPack, buf.data, buf.length, &ap, &size, ret);
free_AuthPack(&ap);
if (ret) {
krb5_set_error_message(context, ret,
N_("Failed encoding AuthPack: %d", ""),
(int)ret);
goto out;
}
if (buf.length != size)
krb5_abortx(context, "internal ASN1 encoder error");
oid = oid_id_pkauthdata();
} else
krb5_abortx(context, "internal pkinit error");
ret = create_signature(context, oid, &buf, ctx->id,
ctx->peer, &sd_buf);
krb5_data_free(&buf);
if (ret)
goto out;
ret = hx509_cms_wrap_ContentInfo(oid_id_pkcs7_signedData(), &sd_buf, &buf);
krb5_data_free(&sd_buf);
if (ret) {
krb5_set_error_message(context, ret,
N_("ContentInfo wrapping of signedData failed",""));
goto out;
}
if (ctx->type == PKINIT_WIN2K) {
PA_PK_AS_REQ_Win2k winreq;
pa_type = KRB5_PADATA_PK_AS_REQ_WIN;
memset(&winreq, 0, sizeof(winreq));
winreq.signed_auth_pack = buf;
ASN1_MALLOC_ENCODE(PA_PK_AS_REQ_Win2k, buf.data, buf.length,
&winreq, &size, ret);
free_PA_PK_AS_REQ_Win2k(&winreq);
} else if (ctx->type == PKINIT_27) {
PA_PK_AS_REQ req;
pa_type = KRB5_PADATA_PK_AS_REQ;
memset(&req, 0, sizeof(req));
req.signedAuthPack = buf;
if (ctx->trustedCertifiers) {
req.trustedCertifiers = calloc(1, sizeof(*req.trustedCertifiers));
if (req.trustedCertifiers == NULL) {
ret = ENOMEM;
krb5_set_error_message(context, ret,
N_("malloc: out of memory", ""));
free_PA_PK_AS_REQ(&req);
goto out;
}
ret = build_edi(context, ctx->id->hx509ctx,
ctx->id->anchors, req.trustedCertifiers);
if (ret) {
krb5_set_error_message(context, ret,
N_("pk-init: failed to build "
"trustedCertifiers", ""));
free_PA_PK_AS_REQ(&req);
goto out;
}
}
req.kdcPkId = NULL;
ASN1_MALLOC_ENCODE(PA_PK_AS_REQ, buf.data, buf.length,
&req, &size, ret);
free_PA_PK_AS_REQ(&req);
} else
krb5_abortx(context, "internal pkinit error");
if (ret) {
krb5_set_error_message(context, ret, "PA-PK-AS-REQ %d", (int)ret);
goto out;
}
if (buf.length != size)
krb5_abortx(context, "Internal ASN1 encoder error");
ret = krb5_padata_add(context, md, pa_type, buf.data, buf.length);
if (ret)
free(buf.data);
if (ret == 0)
krb5_padata_add(context, md, KRB5_PADATA_PK_AS_09_BINDING, NULL, 0);
out:
free_ContentInfo(&content_info);
return ret;
}
krb5_error_code KRB5_LIB_FUNCTION
_krb5_pk_mk_padata(krb5_context context,
void *c,
const KDC_REQ_BODY *req_body,
unsigned nonce,
METHOD_DATA *md)
{
krb5_pk_init_ctx ctx = c;
int win2k_compat;
win2k_compat = krb5_config_get_bool_default(context, NULL,
FALSE,
"realms",
req_body->realm,
"pkinit_win2k",
NULL);
if (win2k_compat) {
ctx->require_binding =
krb5_config_get_bool_default(context, NULL,
FALSE,
"realms",
req_body->realm,
"pkinit_win2k_require_binding",
NULL);
ctx->type = PKINIT_WIN2K;
} else
ctx->type = PKINIT_27;
ctx->require_eku =
krb5_config_get_bool_default(context, NULL,
TRUE,
"realms",
req_body->realm,
"pkinit_require_eku",
NULL);
ctx->require_krbtgt_otherName =
krb5_config_get_bool_default(context, NULL,
TRUE,
"realms",
req_body->realm,
"pkinit_require_krbtgt_otherName",
NULL);
ctx->require_hostname_match =
krb5_config_get_bool_default(context, NULL,
FALSE,
"realms",
req_body->realm,
"pkinit_require_hostname_match",
NULL);
ctx->trustedCertifiers =
krb5_config_get_bool_default(context, NULL,
TRUE,
"realms",
req_body->realm,
"pkinit_trustedCertifiers",
NULL);
return pk_mk_padata(context, ctx, req_body, nonce, md);
}
krb5_error_code KRB5_LIB_FUNCTION
_krb5_pk_verify_sign(krb5_context context,
const void *data,
size_t length,
struct krb5_pk_identity *id,
heim_oid *contentType,
krb5_data *content,
struct krb5_pk_cert **signer)
{
hx509_certs signer_certs;
int ret;
*signer = NULL;
ret = hx509_cms_verify_signed(id->hx509ctx,
id->verify_ctx,
HX509_CMS_VS_ALLOW_DATA_OID_MISMATCH|HX509_CMS_VS_NO_KU_CHECK,
data,
length,
NULL,
id->certpool,
contentType,
content,
&signer_certs);
if (ret) {
pk_copy_error(context, id->hx509ctx, ret,
"CMS verify signed failed");
return ret;
}
*signer = calloc(1, sizeof(**signer));
if (*signer == NULL) {
krb5_clear_error_message(context);
ret = ENOMEM;
goto out;
}
ret = hx509_get_one_cert(id->hx509ctx, signer_certs, &(*signer)->cert);
if (ret) {
pk_copy_error(context, id->hx509ctx, ret,
"Failed to get on of the signer certs");
goto out;
}
out:
hx509_certs_free(&signer_certs);
if (ret) {
if (*signer) {
hx509_cert_free((*signer)->cert);
free(*signer);
*signer = NULL;
}
}
return ret;
}
static krb5_error_code
get_reply_key_win(krb5_context context,
const krb5_data *content,
unsigned nonce,
krb5_keyblock **key)
{
ReplyKeyPack_Win2k key_pack;
krb5_error_code ret;
size_t size;
ret = decode_ReplyKeyPack_Win2k(content->data,
content->length,
&key_pack,
&size);
if (ret) {
krb5_set_error_message(context, ret,
N_("PKINIT decoding reply key failed", ""));
free_ReplyKeyPack_Win2k(&key_pack);
return ret;
}
if (key_pack.nonce != nonce) {
krb5_set_error_message(context, ret,
N_("PKINIT enckey nonce is wrong", ""));
free_ReplyKeyPack_Win2k(&key_pack);
return KRB5KRB_AP_ERR_MODIFIED;
}
*key = malloc (sizeof (**key));
if (*key == NULL) {
free_ReplyKeyPack_Win2k(&key_pack);
krb5_set_error_message(context, ENOMEM,
N_("malloc: out of memory", ""));
return ENOMEM;
}
ret = copy_EncryptionKey(&key_pack.replyKey, *key);
free_ReplyKeyPack_Win2k(&key_pack);
if (ret) {
krb5_set_error_message(context, ret,
N_("PKINIT failed copying reply key", ""));
free(*key);
*key = NULL;
}
return ret;
}
static krb5_error_code
get_reply_key(krb5_context context,
const krb5_data *content,
const krb5_data *req_buffer,
krb5_keyblock **key)
{
ReplyKeyPack key_pack;
krb5_error_code ret;
size_t size;
ret = decode_ReplyKeyPack(content->data,
content->length,
&key_pack,
&size);
if (ret) {
krb5_set_error_message(context, ret,
N_("PKINIT decoding reply key failed", ""));
free_ReplyKeyPack(&key_pack);
return ret;
}
{
krb5_crypto crypto;
/*
* XXX Verify kp.replyKey is a allowed enctype in the
* configuration file
*/
ret = krb5_crypto_init(context, &key_pack.replyKey, 0, &crypto);
if (ret) {
free_ReplyKeyPack(&key_pack);
return ret;
}
ret = krb5_verify_checksum(context, crypto, 6,
req_buffer->data, req_buffer->length,
&key_pack.asChecksum);
krb5_crypto_destroy(context, crypto);
if (ret) {
free_ReplyKeyPack(&key_pack);
return ret;
}
}
*key = malloc (sizeof (**key));
if (*key == NULL) {
free_ReplyKeyPack(&key_pack);
krb5_set_error_message(context, ENOMEM,
N_("malloc: out of memory", ""));
return ENOMEM;
}
ret = copy_EncryptionKey(&key_pack.replyKey, *key);
free_ReplyKeyPack(&key_pack);
if (ret) {
krb5_set_error_message(context, ret,
N_("PKINIT failed copying reply key", ""));
free(*key);
*key = NULL;
}
return ret;
}
static krb5_error_code
pk_verify_host(krb5_context context,
const char *realm,
const krb5_krbhst_info *hi,
struct krb5_pk_init_ctx_data *ctx,
struct krb5_pk_cert *host)
{
krb5_error_code ret = 0;
if (ctx->require_eku) {
ret = hx509_cert_check_eku(ctx->id->hx509ctx, host->cert,
oid_id_pkkdcekuoid(), 0);
if (ret) {
krb5_set_error_message(context, ret,
N_("No PK-INIT KDC EKU in kdc certificate", ""));
return ret;
}
}
if (ctx->require_krbtgt_otherName) {
hx509_octet_string_list list;
int i;
ret = hx509_cert_find_subjectAltName_otherName(ctx->id->hx509ctx,
host->cert,
oid_id_pkinit_san(),
&list);
if (ret) {
krb5_set_error_message(context, ret,
N_("Failed to find the PK-INIT "
"subjectAltName in the KDC "
"certificate", ""));
return ret;
}
for (i = 0; i < list.len; i++) {
KRB5PrincipalName r;
ret = decode_KRB5PrincipalName(list.val[i].data,
list.val[i].length,
&r,
NULL);
if (ret) {
krb5_set_error_message(context, ret,
N_("Failed to decode the PK-INIT "
"subjectAltName in the "
"KDC certificate", ""));
break;
}
if (r.principalName.name_string.len != 2 ||
strcmp(r.principalName.name_string.val[0], KRB5_TGS_NAME) != 0 ||
strcmp(r.principalName.name_string.val[1], realm) != 0 ||
strcmp(r.realm, realm) != 0)
{
ret = KRB5_KDC_ERR_INVALID_CERTIFICATE;
krb5_set_error_message(context, ret,
N_("KDC have wrong realm name in "
"the certificate", ""));
}
free_KRB5PrincipalName(&r);
if (ret)
break;
}
hx509_free_octet_string_list(&list);
}
if (ret)
return ret;
if (hi) {
ret = hx509_verify_hostname(ctx->id->hx509ctx, host->cert,
ctx->require_hostname_match,
HX509_HN_HOSTNAME,
hi->hostname,
hi->ai->ai_addr, hi->ai->ai_addrlen);
if (ret)
krb5_set_error_message(context, ret,
N_("Address mismatch in "
"the KDC certificate", ""));
}
return ret;
}
static krb5_error_code
pk_rd_pa_reply_enckey(krb5_context context,
int type,
const heim_octet_string *indata,
const heim_oid *dataType,
const char *realm,
krb5_pk_init_ctx ctx,
krb5_enctype etype,
const krb5_krbhst_info *hi,
unsigned nonce,
const krb5_data *req_buffer,
PA_DATA *pa,
krb5_keyblock **key)
{
krb5_error_code ret;
struct krb5_pk_cert *host = NULL;
krb5_data content;
heim_oid contentType = { 0, NULL };
if (der_heim_oid_cmp(oid_id_pkcs7_envelopedData(), dataType)) {
krb5_set_error_message(context, EINVAL,
N_("PKINIT: Invalid content type", ""));
return EINVAL;
}
ret = hx509_cms_unenvelope(ctx->id->hx509ctx,
ctx->id->certs,
HX509_CMS_UE_DONT_REQUIRE_KU_ENCIPHERMENT,
indata->data,
indata->length,
NULL,
0,
&contentType,
&content);
if (ret) {
pk_copy_error(context, ctx->id->hx509ctx, ret,
"Failed to unenvelope CMS data in PK-INIT reply");
return ret;
}
der_free_oid(&contentType);
#if 0 /* windows LH with interesting CMS packets, leaks memory */
{
size_t ph = 1 + der_length_len (length);
unsigned char *ptr = malloc(length + ph);
size_t l;
memcpy(ptr + ph, p, length);
ret = der_put_length_and_tag (ptr + ph - 1, ph, length,
ASN1_C_UNIV, CONS, UT_Sequence, &l);
if (ret)
return ret;
ptr += ph - l;
length += l;
p = ptr;
}
#endif
/* win2k uses ContentInfo */
if (type == PKINIT_WIN2K) {
heim_oid type;
heim_octet_string out;
ret = hx509_cms_unwrap_ContentInfo(&content, &type, &out, NULL);
if (der_heim_oid_cmp(&type, oid_id_pkcs7_signedData())) {
ret = EINVAL; /* XXX */
krb5_set_error_message(context, ret,
N_("PKINIT: Invalid content type", ""));
der_free_oid(&type);
der_free_octet_string(&out);
goto out;
}
der_free_oid(&type);
krb5_data_free(&content);
ret = krb5_data_copy(&content, out.data, out.length);
der_free_octet_string(&out);
if (ret) {
krb5_set_error_message(context, ret,
N_("malloc: out of memory", ""));
goto out;
}
}
ret = _krb5_pk_verify_sign(context,
content.data,
content.length,
ctx->id,
&contentType,
&content,
&host);
if (ret)
goto out;
/* make sure that it is the kdc's certificate */
ret = pk_verify_host(context, realm, hi, ctx, host);
if (ret) {
goto out;
}
#if 0
if (type == PKINIT_WIN2K) {
if (der_heim_oid_cmp(&contentType, oid_id_pkcs7_data()) != 0) {
ret = KRB5KRB_AP_ERR_MSG_TYPE;
krb5_set_error_message(context, ret, "PKINIT: reply key, wrong oid");
goto out;
}
} else {
if (der_heim_oid_cmp(&contentType, oid_id_pkrkeydata()) != 0) {
ret = KRB5KRB_AP_ERR_MSG_TYPE;
krb5_set_error_message(context, ret, "PKINIT: reply key, wrong oid");
goto out;
}
}
#endif
switch(type) {
case PKINIT_WIN2K:
ret = get_reply_key(context, &content, req_buffer, key);
if (ret != 0 && ctx->require_binding == 0)
ret = get_reply_key_win(context, &content, nonce, key);
break;
case PKINIT_27:
ret = get_reply_key(context, &content, req_buffer, key);
break;
}
if (ret)
goto out;
/* XXX compare given etype with key->etype */
out:
if (host)
_krb5_pk_cert_free(host);
der_free_oid(&contentType);
krb5_data_free(&content);
return ret;
}
static krb5_error_code
pk_rd_pa_reply_dh(krb5_context context,
const heim_octet_string *indata,
const heim_oid *dataType,
const char *realm,
krb5_pk_init_ctx ctx,
krb5_enctype etype,
const krb5_krbhst_info *hi,
const DHNonce *c_n,
const DHNonce *k_n,
unsigned nonce,
PA_DATA *pa,
krb5_keyblock **key)
{
unsigned char *p, *dh_gen_key = NULL;
struct krb5_pk_cert *host = NULL;
BIGNUM *kdc_dh_pubkey = NULL;
KDCDHKeyInfo kdc_dh_info;
heim_oid contentType = { 0, NULL };
krb5_data content;
krb5_error_code ret;
int dh_gen_keylen;
size_t size;
krb5_data_zero(&content);
memset(&kdc_dh_info, 0, sizeof(kdc_dh_info));
if (der_heim_oid_cmp(oid_id_pkcs7_signedData(), dataType)) {
krb5_set_error_message(context, EINVAL,
N_("PKINIT: Invalid content type", ""));
return EINVAL;
}
ret = _krb5_pk_verify_sign(context,
indata->data,
indata->length,
ctx->id,
&contentType,
&content,
&host);
if (ret)
goto out;
/* make sure that it is the kdc's certificate */
ret = pk_verify_host(context, realm, hi, ctx, host);
if (ret)
goto out;
if (der_heim_oid_cmp(&contentType, oid_id_pkdhkeydata())) {
ret = KRB5KRB_AP_ERR_MSG_TYPE;
krb5_set_error_message(context, ret,
N_("pkinit - dh reply contains wrong oid", ""));
goto out;
}
ret = decode_KDCDHKeyInfo(content.data,
content.length,
&kdc_dh_info,
&size);
if (ret) {
krb5_set_error_message(context, ret,
N_("pkinit - failed to decode "
"KDC DH Key Info", ""));
goto out;
}
if (kdc_dh_info.nonce != nonce) {
ret = KRB5KRB_AP_ERR_MODIFIED;
krb5_set_error_message(context, ret,
N_("PKINIT: DH nonce is wrong", ""));
goto out;
}
if (kdc_dh_info.dhKeyExpiration) {
if (k_n == NULL) {
ret = KRB5KRB_ERR_GENERIC;
krb5_set_error_message(context, ret,
N_("pkinit; got key expiration "
"without server nonce", ""));
goto out;
}
if (c_n == NULL) {
ret = KRB5KRB_ERR_GENERIC;
krb5_set_error_message(context, ret,
N_("pkinit; got DH reuse but no "
"client nonce", ""));
goto out;
}
} else {
if (k_n) {
ret = KRB5KRB_ERR_GENERIC;
krb5_set_error_message(context, ret,
N_("pkinit: got server nonce "
"without key expiration", ""));
goto out;
}
c_n = NULL;
}
p = kdc_dh_info.subjectPublicKey.data;
size = (kdc_dh_info.subjectPublicKey.length + 7) / 8;
{
DHPublicKey k;
ret = decode_DHPublicKey(p, size, &k, NULL);
if (ret) {
krb5_set_error_message(context, ret,
N_("pkinit: can't decode "
"without key expiration", ""));
goto out;
}
kdc_dh_pubkey = integer_to_BN(context, "DHPublicKey", &k);
free_DHPublicKey(&k);
if (kdc_dh_pubkey == NULL) {
ret = ENOMEM;
goto out;
}
}
dh_gen_keylen = DH_size(ctx->dh);
size = BN_num_bytes(ctx->dh->p);
if (size < dh_gen_keylen)
size = dh_gen_keylen;
dh_gen_key = malloc(size);
if (dh_gen_key == NULL) {
ret = ENOMEM;
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
goto out;
}
memset(dh_gen_key, 0, size - dh_gen_keylen);
dh_gen_keylen = DH_compute_key(dh_gen_key + (size - dh_gen_keylen),
kdc_dh_pubkey, ctx->dh);
if (dh_gen_keylen == -1) {
ret = KRB5KRB_ERR_GENERIC;
krb5_set_error_message(context, ret,
N_("PKINIT: Can't compute Diffie-Hellman key", ""));
goto out;
}
*key = malloc (sizeof (**key));
if (*key == NULL) {
ret = ENOMEM;
krb5_set_error_message(context, ret,
N_("malloc: out of memory", ""));
goto out;
}
ret = _krb5_pk_octetstring2key(context,
etype,
dh_gen_key, dh_gen_keylen,
c_n, k_n,
*key);
if (ret) {
krb5_set_error_message(context, ret,
N_("PKINIT: can't create key from DH key", ""));
free(*key);
*key = NULL;
goto out;
}
out:
if (kdc_dh_pubkey)
BN_free(kdc_dh_pubkey);
if (dh_gen_key) {
memset(dh_gen_key, 0, DH_size(ctx->dh));
free(dh_gen_key);
}
if (host)
_krb5_pk_cert_free(host);
if (content.data)
krb5_data_free(&content);
der_free_oid(&contentType);
free_KDCDHKeyInfo(&kdc_dh_info);
return ret;
}
krb5_error_code KRB5_LIB_FUNCTION
_krb5_pk_rd_pa_reply(krb5_context context,
const char *realm,
void *c,
krb5_enctype etype,
const krb5_krbhst_info *hi,
unsigned nonce,
const krb5_data *req_buffer,
PA_DATA *pa,
krb5_keyblock **key)
{
krb5_pk_init_ctx ctx = c;
krb5_error_code ret;
size_t size;
/* Check for IETF PK-INIT first */
if (ctx->type == PKINIT_27) {
PA_PK_AS_REP rep;
heim_octet_string os, data;
heim_oid oid;
if (pa->padata_type != KRB5_PADATA_PK_AS_REP) {
krb5_set_error_message(context, EINVAL,
N_("PKINIT: wrong padata recv", ""));
return EINVAL;
}
ret = decode_PA_PK_AS_REP(pa->padata_value.data,
pa->padata_value.length,
&rep,
&size);
if (ret) {
krb5_set_error_message(context, ret,
N_("Failed to decode pkinit AS rep", ""));
return ret;
}
switch (rep.element) {
case choice_PA_PK_AS_REP_dhInfo:
os = rep.u.dhInfo.dhSignedData;
break;
case choice_PA_PK_AS_REP_encKeyPack:
os = rep.u.encKeyPack;
break;
default: {
PA_PK_AS_REP_BTMM btmm;
free_PA_PK_AS_REP(&rep);
memset(&rep, 0, sizeof(rep));
ret = decode_PA_PK_AS_REP_BTMM(pa->padata_value.data,
pa->padata_value.length,
&btmm,
&size);
if (ret) {
krb5_set_error_message(context, EINVAL,
N_("PKINIT: -27 reply "
"invalid content type", ""));
return EINVAL;
}
if (btmm.dhSignedData || btmm.encKeyPack == NULL) {
free_PA_PK_AS_REP_BTMM(&btmm);
ret = EINVAL;
krb5_set_error_message(context, ret,
N_("DH mode not supported for BTMM mode", ""));
return ret;
}
/*
* Transform to IETF style PK-INIT reply so that free works below
*/
rep.element = choice_PA_PK_AS_REP_encKeyPack;
rep.u.encKeyPack.data = btmm.encKeyPack->data;
rep.u.encKeyPack.length = btmm.encKeyPack->length;
btmm.encKeyPack->data = NULL;
btmm.encKeyPack->length = 0;
free_PA_PK_AS_REP_BTMM(&btmm);
os = rep.u.encKeyPack;
}
}
ret = hx509_cms_unwrap_ContentInfo(&os, &oid, &data, NULL);
if (ret) {
free_PA_PK_AS_REP(&rep);
krb5_set_error_message(context, ret,
N_("PKINIT: failed to unwrap CI", ""));
return ret;
}
switch (rep.element) {
case choice_PA_PK_AS_REP_dhInfo:
ret = pk_rd_pa_reply_dh(context, &data, &oid, realm, ctx, etype, hi,
ctx->clientDHNonce,
rep.u.dhInfo.serverDHNonce,
nonce, pa, key);
break;
case choice_PA_PK_AS_REP_encKeyPack:
ret = pk_rd_pa_reply_enckey(context, PKINIT_27, &data, &oid, realm,
ctx, etype, hi, nonce, req_buffer, pa, key);
break;
default:
krb5_abortx(context, "pk-init as-rep case not possible to happen");
}
der_free_octet_string(&data);
der_free_oid(&oid);
free_PA_PK_AS_REP(&rep);
} else if (ctx->type == PKINIT_WIN2K) {
PA_PK_AS_REP_Win2k w2krep;
/* Check for Windows encoding of the AS-REP pa data */
#if 0 /* should this be ? */
if (pa->padata_type != KRB5_PADATA_PK_AS_REP) {
krb5_set_error_message(context, EINVAL,
"PKINIT: wrong padata recv");
return EINVAL;
}
#endif
memset(&w2krep, 0, sizeof(w2krep));
ret = decode_PA_PK_AS_REP_Win2k(pa->padata_value.data,
pa->padata_value.length,
&w2krep,
&size);
if (ret) {
krb5_set_error_message(context, ret,
N_("PKINIT: Failed decoding windows "
"pkinit reply %d", ""), (int)ret);
return ret;
}
krb5_clear_error_message(context);
switch (w2krep.element) {
case choice_PA_PK_AS_REP_Win2k_encKeyPack: {
heim_octet_string data;
heim_oid oid;
ret = hx509_cms_unwrap_ContentInfo(&w2krep.u.encKeyPack,
&oid, &data, NULL);
free_PA_PK_AS_REP_Win2k(&w2krep);
if (ret) {
krb5_set_error_message(context, ret,
N_("PKINIT: failed to unwrap CI", ""));
return ret;
}
ret = pk_rd_pa_reply_enckey(context, PKINIT_WIN2K, &data, &oid, realm,
ctx, etype, hi, nonce, req_buffer, pa, key);
der_free_octet_string(&data);
der_free_oid(&oid);
break;
}
default:
free_PA_PK_AS_REP_Win2k(&w2krep);
ret = EINVAL;
krb5_set_error_message(context, ret,
N_("PKINIT: win2k reply invalid "
"content type", ""));
break;
}
} else {
ret = EINVAL;
krb5_set_error_message(context, ret,
N_("PKINIT: unknown reply type", ""));
}
return ret;
}
struct prompter {
krb5_context context;
krb5_prompter_fct prompter;
void *prompter_data;
};
static int
hx_pass_prompter(void *data, const hx509_prompt *prompter)
{
krb5_error_code ret;
krb5_prompt prompt;
krb5_data password_data;
struct prompter *p = data;
password_data.data = prompter->reply.data;
password_data.length = prompter->reply.length;
prompt.prompt = prompter->prompt;
prompt.hidden = hx509_prompt_hidden(prompter->type);
prompt.reply = &password_data;
switch (prompter->type) {
case HX509_PROMPT_TYPE_INFO:
prompt.type = KRB5_PROMPT_TYPE_INFO;
break;
case HX509_PROMPT_TYPE_PASSWORD:
case HX509_PROMPT_TYPE_QUESTION:
default:
prompt.type = KRB5_PROMPT_TYPE_PASSWORD;
break;
}
ret = (*p->prompter)(p->context, p->prompter_data, NULL, NULL, 1, &prompt);
if (ret) {
memset (prompter->reply.data, 0, prompter->reply.length);
return 1;
}
return 0;
}
void KRB5_LIB_FUNCTION
_krb5_pk_allow_proxy_certificate(struct krb5_pk_identity *id,
int boolean)
{
hx509_verify_set_proxy_certificate(id->verify_ctx, boolean);
}
krb5_error_code KRB5_LIB_FUNCTION
_krb5_pk_load_id(krb5_context context,
struct krb5_pk_identity **ret_id,
const char *user_id,
const char *anchor_id,
char * const *chain_list,
char * const *revoke_list,
krb5_prompter_fct prompter,
void *prompter_data,
char *password)
{
struct krb5_pk_identity *id = NULL;
hx509_lock lock = NULL;
struct prompter p;
int ret;
*ret_id = NULL;
if (anchor_id == NULL) {
krb5_set_error_message(context, HEIM_PKINIT_NO_VALID_CA,
N_("PKINIT: No anchor given", ""));
return HEIM_PKINIT_NO_VALID_CA;
}
if (user_id == NULL) {
krb5_set_error_message(context, HEIM_PKINIT_NO_PRIVATE_KEY,
N_("PKINIT: No user certificate given", ""));
return HEIM_PKINIT_NO_PRIVATE_KEY;
}
/* load cert */
id = calloc(1, sizeof(*id));
if (id == NULL) {
krb5_set_error_message(context, ENOMEM,
N_("malloc: out of memory", ""));
return ENOMEM;
}
ret = hx509_context_init(&id->hx509ctx);
if (ret)
goto out;
ret = hx509_lock_init(id->hx509ctx, &lock);
if (password && password[0])
hx509_lock_add_password(lock, password);
if (prompter) {
p.context = context;
p.prompter = prompter;
p.prompter_data = prompter_data;
ret = hx509_lock_set_prompter(lock, hx_pass_prompter, &p);
if (ret)
goto out;
}
ret = hx509_certs_init(id->hx509ctx, user_id, 0, lock, &id->certs);
if (ret) {
pk_copy_error(context, id->hx509ctx, ret,
"Failed to init cert certs");
goto out;
}
ret = hx509_certs_init(id->hx509ctx, anchor_id, 0, NULL, &id->anchors);
if (ret) {
pk_copy_error(context, id->hx509ctx, ret,
"Failed to init anchors");
goto out;
}
ret = hx509_certs_init(id->hx509ctx, "MEMORY:pkinit-cert-chain",
0, NULL, &id->certpool);
if (ret) {
pk_copy_error(context, id->hx509ctx, ret,
"Failed to init chain");
goto out;
}
while (chain_list && *chain_list) {
ret = hx509_certs_append(id->hx509ctx, id->certpool,
NULL, *chain_list);
if (ret) {
pk_copy_error(context, id->hx509ctx, ret,
"Failed to laod chain %s",
*chain_list);
goto out;
}
chain_list++;
}
if (revoke_list) {
ret = hx509_revoke_init(id->hx509ctx, &id->revokectx);
if (ret) {
pk_copy_error(context, id->hx509ctx, ret,
"Failed init revoke list");
goto out;
}
while (*revoke_list) {
ret = hx509_revoke_add_crl(id->hx509ctx,
id->revokectx,
*revoke_list);
if (ret) {
pk_copy_error(context, id->hx509ctx, ret,
"Failed load revoke list");
goto out;
}
revoke_list++;
}
} else
hx509_context_set_missing_revoke(id->hx509ctx, 1);
ret = hx509_verify_init_ctx(id->hx509ctx, &id->verify_ctx);
if (ret) {
pk_copy_error(context, id->hx509ctx, ret,
"Failed init verify context");
goto out;
}
hx509_verify_attach_anchors(id->verify_ctx, id->anchors);
hx509_verify_attach_revoke(id->verify_ctx, id->revokectx);
out:
if (ret) {
hx509_verify_destroy_ctx(id->verify_ctx);
hx509_certs_free(&id->certs);
hx509_certs_free(&id->anchors);
hx509_certs_free(&id->certpool);
hx509_revoke_free(&id->revokectx);
hx509_context_free(&id->hx509ctx);
free(id);
} else
*ret_id = id;
if (lock)
hx509_lock_free(lock);
return ret;
}
static krb5_error_code
select_dh_group(krb5_context context, DH *dh, unsigned long bits,
struct krb5_dh_moduli **moduli)
{
const struct krb5_dh_moduli *m;
if (bits == 0) {
m = moduli[1]; /* XXX */
if (m == NULL)
m = moduli[0]; /* XXX */
} else {
int i;
for (i = 0; moduli[i] != NULL; i++) {
if (bits < moduli[i]->bits)
break;
}
if (moduli[i] == NULL) {
krb5_set_error_message(context, EINVAL,
N_("Did not find a DH group parameter "
"matching requirement of %lu bits", ""),
bits);
return EINVAL;
}
m = moduli[i];
}
dh->p = integer_to_BN(context, "p", &m->p);
if (dh->p == NULL)
return ENOMEM;
dh->g = integer_to_BN(context, "g", &m->g);
if (dh->g == NULL)
return ENOMEM;
dh->q = integer_to_BN(context, "q", &m->q);
if (dh->q == NULL)
return ENOMEM;
return 0;
}
/*
*
*/
static void
pk_copy_error(krb5_context context,
hx509_context hx509ctx,
int hxret,
const char *fmt,
...)
{
va_list va;
char *s, *f;
va_start(va, fmt);
vasprintf(&f, fmt, va);
va_end(va);
if (f == NULL) {
krb5_clear_error_message(context);
return;
}
s = hx509_get_error_string(hx509ctx, hxret);
if (s == NULL) {
krb5_clear_error_message(context);
free(f);
return;
}
krb5_set_error_message(context, hxret, "%s: %s", f, s);
free(s);
free(f);
}
static int
parse_integer(krb5_context context, char **p, const char *file, int lineno,
const char *name, heim_integer *integer)
{
int ret;
char *p1;
p1 = strsep(p, " \t");
if (p1 == NULL) {
krb5_set_error_message(context, EINVAL,
N_("moduli file %s missing %s on line %d", ""),
file, name, lineno);
return EINVAL;
}
ret = der_parse_hex_heim_integer(p1, integer);
if (ret) {
krb5_set_error_message(context, ret,
N_("moduli file %s failed parsing %s "
"on line %d", ""),
file, name, lineno);
return ret;
}
return 0;
}
krb5_error_code
_krb5_parse_moduli_line(krb5_context context,
const char *file,
int lineno,
char *p,
struct krb5_dh_moduli **m)
{
struct krb5_dh_moduli *m1;
char *p1;
int ret;
*m = NULL;
m1 = calloc(1, sizeof(*m1));
if (m1 == NULL) {
krb5_set_error_message(context, ENOMEM,
N_("malloc: out of memory", ""));
return ENOMEM;
}
while (isspace((unsigned char)*p))
p++;
if (*p == '#') {
free(m1);
return 0;
}
ret = EINVAL;
p1 = strsep(&p, " \t");
if (p1 == NULL) {
krb5_set_error_message(context, ret,
N_("moduli file %s missing name on line %d", ""),
file, lineno);
goto out;
}
m1->name = strdup(p1);
if (m1->name == NULL) {
ret = ENOMEM;
krb5_set_error_message(context, ret, N_("malloc: out of memeory", ""));
goto out;
}
p1 = strsep(&p, " \t");
if (p1 == NULL) {
krb5_set_error_message(context, ret,
N_("moduli file %s missing bits on line %d", ""),
file, lineno);
goto out;
}
m1->bits = atoi(p1);
if (m1->bits == 0) {
krb5_set_error_message(context, ret,
N_("moduli file %s have un-parsable "
"bits on line %d", ""), file, lineno);
goto out;
}
ret = parse_integer(context, &p, file, lineno, "p", &m1->p);
if (ret)
goto out;
ret = parse_integer(context, &p, file, lineno, "g", &m1->g);
if (ret)
goto out;
ret = parse_integer(context, &p, file, lineno, "q", &m1->q);
if (ret)
goto out;
*m = m1;
return 0;
out:
free(m1->name);
der_free_heim_integer(&m1->p);
der_free_heim_integer(&m1->g);
der_free_heim_integer(&m1->q);
free(m1);
return ret;
}
void
_krb5_free_moduli(struct krb5_dh_moduli **moduli)
{
int i;
for (i = 0; moduli[i] != NULL; i++) {
free(moduli[i]->name);
der_free_heim_integer(&moduli[i]->p);
der_free_heim_integer(&moduli[i]->g);
der_free_heim_integer(&moduli[i]->q);
free(moduli[i]);
}
free(moduli);
}
static const char *default_moduli_RFC2412_MODP_group2 =
/* name */
"RFC2412-MODP-group2 "
/* bits */
"1024 "
/* p */
"FFFFFFFF" "FFFFFFFF" "C90FDAA2" "2168C234" "C4C6628B" "80DC1CD1"
"29024E08" "8A67CC74" "020BBEA6" "3B139B22" "514A0879" "8E3404DD"
"EF9519B3" "CD3A431B" "302B0A6D" "F25F1437" "4FE1356D" "6D51C245"
"E485B576" "625E7EC6" "F44C42E9" "A637ED6B" "0BFF5CB6" "F406B7ED"
"EE386BFB" "5A899FA5" "AE9F2411" "7C4B1FE6" "49286651" "ECE65381"
"FFFFFFFF" "FFFFFFFF "
/* g */
"02 "
/* q */
"7FFFFFFF" "FFFFFFFF" "E487ED51" "10B4611A" "62633145" "C06E0E68"
"94812704" "4533E63A" "0105DF53" "1D89CD91" "28A5043C" "C71A026E"
"F7CA8CD9" "E69D218D" "98158536" "F92F8A1B" "A7F09AB6" "B6A8E122"
"F242DABB" "312F3F63" "7A262174" "D31BF6B5" "85FFAE5B" "7A035BF6"
"F71C35FD" "AD44CFD2" "D74F9208" "BE258FF3" "24943328" "F67329C0"
"FFFFFFFF" "FFFFFFFF";
static const char *default_moduli_rfc3526_MODP_group14 =
/* name */
"rfc3526-MODP-group14 "
/* bits */
"1760 "
/* p */
"FFFFFFFF" "FFFFFFFF" "C90FDAA2" "2168C234" "C4C6628B" "80DC1CD1"
"29024E08" "8A67CC74" "020BBEA6" "3B139B22" "514A0879" "8E3404DD"
"EF9519B3" "CD3A431B" "302B0A6D" "F25F1437" "4FE1356D" "6D51C245"
"E485B576" "625E7EC6" "F44C42E9" "A637ED6B" "0BFF5CB6" "F406B7ED"
"EE386BFB" "5A899FA5" "AE9F2411" "7C4B1FE6" "49286651" "ECE45B3D"
"C2007CB8" "A163BF05" "98DA4836" "1C55D39A" "69163FA8" "FD24CF5F"
"83655D23" "DCA3AD96" "1C62F356" "208552BB" "9ED52907" "7096966D"
"670C354E" "4ABC9804" "F1746C08" "CA18217C" "32905E46" "2E36CE3B"
"E39E772C" "180E8603" "9B2783A2" "EC07A28F" "B5C55DF0" "6F4C52C9"
"DE2BCBF6" "95581718" "3995497C" "EA956AE5" "15D22618" "98FA0510"
"15728E5A" "8AACAA68" "FFFFFFFF" "FFFFFFFF "
/* g */
"02 "
/* q */
"7FFFFFFF" "FFFFFFFF" "E487ED51" "10B4611A" "62633145" "C06E0E68"
"94812704" "4533E63A" "0105DF53" "1D89CD91" "28A5043C" "C71A026E"
"F7CA8CD9" "E69D218D" "98158536" "F92F8A1B" "A7F09AB6" "B6A8E122"
"F242DABB" "312F3F63" "7A262174" "D31BF6B5" "85FFAE5B" "7A035BF6"
"F71C35FD" "AD44CFD2" "D74F9208" "BE258FF3" "24943328" "F6722D9E"
"E1003E5C" "50B1DF82" "CC6D241B" "0E2AE9CD" "348B1FD4" "7E9267AF"
"C1B2AE91" "EE51D6CB" "0E3179AB" "1042A95D" "CF6A9483" "B84B4B36"
"B3861AA7" "255E4C02" "78BA3604" "650C10BE" "19482F23" "171B671D"
"F1CF3B96" "0C074301" "CD93C1D1" "7603D147" "DAE2AEF8" "37A62964"
"EF15E5FB" "4AAC0B8C" "1CCAA4BE" "754AB572" "8AE9130C" "4C7D0288"
"0AB9472D" "45565534" "7FFFFFFF" "FFFFFFFF";
krb5_error_code
_krb5_parse_moduli(krb5_context context, const char *file,
struct krb5_dh_moduli ***moduli)
{
/* name bits P G Q */
krb5_error_code ret;
struct krb5_dh_moduli **m = NULL, **m2;
char buf[4096];
FILE *f;
int lineno = 0, n = 0;
*moduli = NULL;
m = calloc(1, sizeof(m[0]) * 3);
if (m == NULL) {
krb5_set_error_message(context, ENOMEM,
N_("malloc: out of memory", ""));
return ENOMEM;
}
strlcpy(buf, default_moduli_rfc3526_MODP_group14, sizeof(buf));
ret = _krb5_parse_moduli_line(context, "builtin", 1, buf, &m[0]);
if (ret) {
_krb5_free_moduli(m);
return ret;
}
n++;
strlcpy(buf, default_moduli_RFC2412_MODP_group2, sizeof(buf));
ret = _krb5_parse_moduli_line(context, "builtin", 1, buf, &m[1]);
if (ret) {
_krb5_free_moduli(m);
return ret;
}
n++;
if (file == NULL)
file = MODULI_FILE;
f = fopen(file, "r");
if (f == NULL) {
*moduli = m;
return 0;
}
rk_cloexec_file(f);
while(fgets(buf, sizeof(buf), f) != NULL) {
struct krb5_dh_moduli *element;
buf[strcspn(buf, "\n")] = '\0';
lineno++;
m2 = realloc(m, (n + 2) * sizeof(m[0]));
if (m2 == NULL) {
_krb5_free_moduli(m);
krb5_set_error_message(context, ENOMEM,
N_("malloc: out of memory", ""));
return ENOMEM;
}
m = m2;
m[n] = NULL;
ret = _krb5_parse_moduli_line(context, file, lineno, buf, &element);
if (ret) {
_krb5_free_moduli(m);
return ret;
}
if (element == NULL)
continue;
m[n] = element;
m[n + 1] = NULL;
n++;
}
*moduli = m;
return 0;
}
krb5_error_code
_krb5_dh_group_ok(krb5_context context, unsigned long bits,
heim_integer *p, heim_integer *g, heim_integer *q,
struct krb5_dh_moduli **moduli,
char **name)
{
int i;
if (name)
*name = NULL;
for (i = 0; moduli[i] != NULL; i++) {
if (der_heim_integer_cmp(&moduli[i]->g, g) == 0 &&
der_heim_integer_cmp(&moduli[i]->p, p) == 0 &&
(q == NULL || der_heim_integer_cmp(&moduli[i]->q, q) == 0))
{
if (bits && bits > moduli[i]->bits) {
krb5_set_error_message(context,
KRB5_KDC_ERR_DH_KEY_PARAMETERS_NOT_ACCEPTED,
N_("PKINIT: DH group parameter %s "
"no accepted, not enough bits "
"generated", ""),
moduli[i]->name);
return KRB5_KDC_ERR_DH_KEY_PARAMETERS_NOT_ACCEPTED;
}
if (name)
*name = strdup(moduli[i]->name);
return 0;
}
}
krb5_set_error_message(context,
KRB5_KDC_ERR_DH_KEY_PARAMETERS_NOT_ACCEPTED,
N_("PKINIT: DH group parameter no ok", ""));
return KRB5_KDC_ERR_DH_KEY_PARAMETERS_NOT_ACCEPTED;
}
#endif /* PKINIT */
void KRB5_LIB_FUNCTION
_krb5_get_init_creds_opt_free_pkinit(krb5_get_init_creds_opt *opt)
{
#ifdef PKINIT
krb5_pk_init_ctx ctx;
if (opt->opt_private == NULL || opt->opt_private->pk_init_ctx == NULL)
return;
ctx = opt->opt_private->pk_init_ctx;
if (ctx->dh)
DH_free(ctx->dh);
ctx->dh = NULL;
if (ctx->id) {
hx509_verify_destroy_ctx(ctx->id->verify_ctx);
hx509_certs_free(&ctx->id->certs);
hx509_certs_free(&ctx->id->anchors);
hx509_certs_free(&ctx->id->certpool);
hx509_context_free(&ctx->id->hx509ctx);
if (ctx->clientDHNonce) {
krb5_free_data(NULL, ctx->clientDHNonce);
ctx->clientDHNonce = NULL;
}
if (ctx->m)
_krb5_free_moduli(ctx->m);
free(ctx->id);
ctx->id = NULL;
}
free(opt->opt_private->pk_init_ctx);
opt->opt_private->pk_init_ctx = NULL;
#endif
}
krb5_error_code KRB5_LIB_FUNCTION
krb5_get_init_creds_opt_set_pkinit(krb5_context context,
krb5_get_init_creds_opt *opt,
krb5_principal principal,
const char *user_id,
const char *x509_anchors,
char * const * pool,
char * const * pki_revoke,
int flags,
krb5_prompter_fct prompter,
void *prompter_data,
char *password)
{
#ifdef PKINIT
krb5_error_code ret;
char *anchors = NULL;
if (opt->opt_private == NULL) {
krb5_set_error_message(context, EINVAL,
N_("PKINIT: on non extendable opt", ""));
return EINVAL;
}
opt->opt_private->pk_init_ctx =
calloc(1, sizeof(*opt->opt_private->pk_init_ctx));
if (opt->opt_private->pk_init_ctx == NULL) {
krb5_set_error_message(context, ENOMEM,
N_("malloc: out of memory", ""));
return ENOMEM;
}
opt->opt_private->pk_init_ctx->dh = NULL;
opt->opt_private->pk_init_ctx->id = NULL;
opt->opt_private->pk_init_ctx->clientDHNonce = NULL;
opt->opt_private->pk_init_ctx->require_binding = 0;
opt->opt_private->pk_init_ctx->require_eku = 1;
opt->opt_private->pk_init_ctx->require_krbtgt_otherName = 1;
opt->opt_private->pk_init_ctx->peer = NULL;
/* XXX implement krb5_appdefault_strings */
if (pool == NULL)
pool = krb5_config_get_strings(context, NULL,
"appdefaults",
"pkinit_pool",
NULL);
if (pki_revoke == NULL)
pki_revoke = krb5_config_get_strings(context, NULL,
"appdefaults",
"pkinit_revoke",
NULL);
if (x509_anchors == NULL) {
krb5_appdefault_string(context, "kinit",
krb5_principal_get_realm(context, principal),
"pkinit_anchors", NULL, &anchors);
x509_anchors = anchors;
}
ret = _krb5_pk_load_id(context,
&opt->opt_private->pk_init_ctx->id,
user_id,
x509_anchors,
pool,
pki_revoke,
prompter,
prompter_data,
password);
if (ret) {
free(opt->opt_private->pk_init_ctx);
opt->opt_private->pk_init_ctx = NULL;
return ret;
}
if ((flags & 2) == 0) {
const char *moduli_file;
unsigned long dh_min_bits;
moduli_file = krb5_config_get_string(context, NULL,
"libdefaults",
"moduli",
NULL);
dh_min_bits =
krb5_config_get_int_default(context, NULL, 0,
"libdefaults",
"pkinit_dh_min_bits",
NULL);
ret = _krb5_parse_moduli(context, moduli_file,
&opt->opt_private->pk_init_ctx->m);
if (ret) {
_krb5_get_init_creds_opt_free_pkinit(opt);
return ret;
}
opt->opt_private->pk_init_ctx->dh = DH_new();
if (opt->opt_private->pk_init_ctx->dh == NULL) {
_krb5_get_init_creds_opt_free_pkinit(opt);
krb5_set_error_message(context, ENOMEM,
N_("malloc: out of memory", ""));
return ENOMEM;
}
ret = select_dh_group(context, opt->opt_private->pk_init_ctx->dh,
dh_min_bits,
opt->opt_private->pk_init_ctx->m);
if (ret) {
_krb5_get_init_creds_opt_free_pkinit(opt);
return ret;
}
if (DH_generate_key(opt->opt_private->pk_init_ctx->dh) != 1) {
_krb5_get_init_creds_opt_free_pkinit(opt);
krb5_set_error_message(context, ENOMEM,
N_("pkinit: failed to generate DH key", ""));
return ENOMEM;
}
}
return 0;
#else
krb5_set_error_message(context, EINVAL,
N_("no support for PKINIT compiled in", ""));
return EINVAL;
#endif
}
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