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b4d451a2344bd3cac8460b9bd3f87f01342a81b0
heimdal/lib/krb5/pkinit.c
Love Hörnquist Åstrand d90f956e94 (pk_verify_chain_standard): store better error message in the context 
for certificate errors.


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@15188 ec53bebd-3082-4978-b11e-865c3cabbd6b
2005-05-19 18:27:15 +00:00

2586 lines
63 KiB
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/*
* Copyright (c) 2003 - 2005 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("$Id$");
#ifdef PKINIT
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#include <openssl/dh.h>
#include <openssl/bn.h>
#include <openssl/engine.h>
#include <openssl/ui.h>
#ifdef HAVE_DIRENT_H
#include <dirent.h>
#endif
#include "heim_asn1.h"
#include "rfc2459_asn1.h"
#include "cms_asn1.h"
#include "pkinit_asn1.h"
enum {
COMPAT_WIN2K = 1,
COMPAT_19 = 2,
COMPAT_25 = 3
};
#define OPENSSL_ASN1_MALLOC_ENCODE(T, B, BL, S, R) \
{ \
unsigned char *p; \
(BL) = i2d_##T((S), NULL); \
if ((BL) <= 0) { \
(R) = EINVAL; \
} else { \
(B) = malloc((BL)); \
if ((B) == NULL) { \
(R) = ENOMEM; \
} else { \
p = (B); \
(R) = 0; \
(BL) = i2d_##T((S), &p); \
if ((BL) <= 0) { \
free((B)); \
(R) = ASN1_OVERRUN; \
} \
} \
} \
}
/* ENGING_load_private_key requires a UI_METHOD and data
* if to be usable from PAM
*/
struct krb5_ui_data {
krb5_context context;
krb5_prompter_fct prompter;
void * prompter_data;
};
struct krb5_pk_identity {
EVP_PKEY *private_key;
STACK_OF(X509) *cert;
STACK_OF(X509) *trusted_certs;
STACK_OF(X509_CRL) *crls;
ENGINE *engine;
};
struct krb5_pk_cert {
X509 *cert;
};
struct krb5_pk_init_ctx_data {
struct krb5_pk_identity *id;
DH *dh;
};
void KRB5_LIB_FUNCTION
_krb5_pk_cert_free(struct krb5_pk_cert *cert)
{
if (cert->cert)
X509_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_string(context);
return ENOMEM;
}
BN_bn2bin(bn, integer->data);
integer->negative = bn->neg;
return 0;
}
/*
* UI ex_data has the callback_data as passed to Engine. This is far
* from being complete, we will only process one prompt
*/
static int
krb5_ui_method_read_string(UI *ui, UI_STRING *uis)
{
char *buffer;
size_t length;
krb5_error_code ret;
krb5_prompt prompt;
krb5_data password_data;
struct krb5_ui_data *ui_data;
ui_data = (struct krb5_ui_data *)UI_get_app_data(ui);
switch (UI_get_string_type(uis)) {
case UIT_INFO:
case UIT_ERROR:
/* looks like the RedHat pam_prompter might handle
* INFO and ERROR, Will see what happens */
case UIT_VERIFY:
case UIT_PROMPT:
length = UI_get_result_maxsize(uis);
buffer = malloc(length);
if (buffer == NULL) {
krb5_set_error_string(ui_data->context, "malloc: out of memory");
return 0;
}
password_data.data = buffer;
password_data.length = length;
prompt.prompt = UI_get0_output_string(uis);
prompt.hidden = !(UI_get_input_flags(uis) & UI_INPUT_FLAG_ECHO);
prompt.reply = &password_data;
prompt.type = KRB5_PROMPT_TYPE_PASSWORD;
ret = (*ui_data->prompter)(ui_data->context,
ui_data->prompter_data,
NULL, NULL, 1, &prompt);
if (ret == 0) {
buffer[length - 1] = '\0';
UI_set_result(ui, uis, password_data.data);
/*
* RedHat pam_krb5 pam_prompter does a strdup but others
* may copy into buffer. XXX should we just leak the
* memory instead ?
*/
if (buffer != password_data.data)
free(password_data.data);
memset (buffer, 0, length);
free(buffer);
return 1;
}
memset (buffer, 0, length);
free(buffer);
break;
case UIT_NONE:
case UIT_BOOLEAN:
/* XXX for now do not handle */
break;
}
return 0;
}
static krb5_error_code
set_digest_alg(DigestAlgorithmIdentifier *id,
const heim_oid *oid,
void *param, size_t length)
{
krb5_error_code ret;
if (param) {
id->parameters = malloc(sizeof(*id->parameters));
if (id->parameters == NULL)
return ENOMEM;
id->parameters->data = malloc(length);
if (id->parameters->data == NULL) {
free(id->parameters);
id->parameters = NULL;
return ENOMEM;
}
memcpy(id->parameters->data, param, length);
id->parameters->length = length;
} else
id->parameters = NULL;
ret = copy_oid(oid, &id->algorithm);
if (ret) {
if (id->parameters) {
free(id->parameters->data);
free(id->parameters);
id->parameters = NULL;
}
return ret;
}
return 0;
}
krb5_error_code KRB5_LIB_FUNCTION
_krb5_pk_create_sign(krb5_context context,
const heim_oid *eContentType,
krb5_data *eContent,
struct krb5_pk_identity *id,
krb5_data *sd_data)
{
SignerInfo *signer_info;
X509 *user_cert;
heim_integer *serial;
krb5_error_code ret;
krb5_data buf;
SignedData sd;
EVP_MD_CTX md;
int len, i;
size_t size;
X509_NAME *issuer_name;
memset(&sd, 0, sizeof(sd));
if (id == NULL)
return HEIM_PKINIT_NO_CERTIFICATE;
if (id->cert == NULL)
return HEIM_PKINIT_NO_CERTIFICATE;
if (id->private_key == NULL)
return HEIM_PKINIT_NO_PRIVATE_KEY;
if (sk_X509_num(id->cert) == 0)
return HEIM_PKINIT_NO_CERTIFICATE;
sd.version = 3;
sd.digestAlgorithms.len = 0;
sd.digestAlgorithms.val = NULL;
copy_oid(eContentType, &sd.encapContentInfo.eContentType);
ALLOC(sd.encapContentInfo.eContent, 1);
if (sd.encapContentInfo.eContent == NULL) {
krb5_clear_error_string(context);
ret = ENOMEM;
goto out;
}
ret = krb5_data_copy(&buf, eContent->data, eContent->length);
if (ret) {
krb5_clear_error_string(context);
ret = ENOMEM;
goto out;
}
sd.encapContentInfo.eContent->data = buf.data;
sd.encapContentInfo.eContent->length = buf.length;
ALLOC_SEQ(&sd.signerInfos, 1);
if (sd.signerInfos.val == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
ret = ENOMEM;
goto out;
}
signer_info = &sd.signerInfos.val[0];
user_cert = sk_X509_value(id->cert, 0);
if (user_cert == NULL) {
krb5_set_error_string(context, "pkinit: no user certificate");
ret = HEIM_PKINIT_NO_CERTIFICATE;
goto out;
}
signer_info->version = 1;
issuer_name = X509_get_issuer_name(user_cert);
OPENSSL_ASN1_MALLOC_ENCODE(X509_NAME,
buf.data,
buf.length,
issuer_name,
ret);
if (ret) {
krb5_set_error_string(context, "pkinit: failed encoding name");
goto out;
}
ret = decode_Name(buf.data, buf.length,
&signer_info->sid.u.issuerAndSerialNumber.issuer,
NULL);
free(buf.data);
if (ret) {
krb5_set_error_string(context, "pkinit: failed to parse Name");
goto out;
}
signer_info->sid.element = choice_CMSIdentifier_issuerAndSerialNumber;
serial = &signer_info->sid.u.issuerAndSerialNumber.serialNumber;
{
ASN1_INTEGER *isn = X509_get_serialNumber(user_cert);
BIGNUM *bn = ASN1_INTEGER_to_BN(isn, NULL);
if (bn == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "pkinit: failed allocating "
"serial number");
goto out;
}
ret = BN_to_integer(context, bn, serial);
BN_free(bn);
if (ret) {
krb5_set_error_string(context, "pkinit: failed encoding "
"serial number");
goto out;
}
}
ret = set_digest_alg(&signer_info->digestAlgorithm,
oid_id_secsig_sha_1(), "\x05\x00", 2);
if (ret) {
krb5_set_error_string(context, "malloc: out of memory");
goto out;
}
signer_info->signedAttrs = NULL;
signer_info->unsignedAttrs = NULL;
copy_oid(oid_id_pkcs1_rsaEncryption(),
&signer_info->signatureAlgorithm.algorithm);
signer_info->signatureAlgorithm.parameters = NULL;
buf.data = malloc(EVP_PKEY_size(id->private_key));
if (buf.data == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
ret = ENOMEM;
goto out;
}
EVP_SignInit(&md, EVP_sha1());
EVP_SignUpdate(&md,
sd.encapContentInfo.eContent->data,
sd.encapContentInfo.eContent->length);
ret = EVP_SignFinal(&md, buf.data, &len, id->private_key);
if (ret != 1) {
free(buf.data);
krb5_set_error_string(context, "PKINIT: failed to sign with "
"private key: %s",
ERR_error_string(ERR_get_error(), NULL));
ret = EINVAL;
goto out;
}
signer_info->signature.data = buf.data;
signer_info->signature.length = len;
ALLOC_SEQ(&sd.digestAlgorithms, 1);
if (sd.digestAlgorithms.val == NULL) {
krb5_clear_error_string(context);
ret = ENOMEM;
goto out;
}
ret = set_digest_alg(&sd.digestAlgorithms.val[0],
oid_id_secsig_sha_1(), "\x05\x00", 2);
if (ret) {
krb5_set_error_string(context, "malloc: out of memory");
goto out;
}
ALLOC(sd.certificates, 1);
if (sd.certificates == NULL) {
krb5_clear_error_string(context);
ret = ENOMEM;
goto out;
}
sd.certificates->data = NULL;
sd.certificates->length = 0;
for (i = 0; i < sk_X509_num(id->cert); i++) {
void *data;
OPENSSL_ASN1_MALLOC_ENCODE(X509,
buf.data,
buf.length,
sk_X509_value(id->cert, i),
ret);
if (ret) {
krb5_clear_error_string(context);
goto out;
}
data = realloc(sd.certificates->data,
sd.certificates->length + buf.length);
if (data == NULL) {
free(buf.data);
krb5_clear_error_string(context);
ret = ENOMEM;
goto out;
}
memcpy(((char *)data) + sd.certificates->length,
buf.data, buf.length);
sd.certificates->length += buf.length;
sd.certificates->data = data;
free(buf.data);
}
ASN1_MALLOC_ENCODE(SignedData, sd_data->data, sd_data->length,
&sd, &size, ret);
if (ret) {
krb5_set_error_string(context, "SignedData failed %d", ret);
goto out;
}
if (sd_data->length != size)
krb5_abortx(context, "internal ASN1 encoder error");
out:
free_SignedData(&sd);
return ret;
}
static krb5_error_code
build_auth_pack_win2k(krb5_context context,
unsigned nonce,
const KDC_REQ_BODY *body,
AuthPack_Win2k *a)
{
krb5_error_code ret;
krb5_timestamp sec;
int32_t usec;
/* fill in PKAuthenticator */
ret = copy_PrincipalName(body->sname, &a->pkAuthenticator.kdcName);
if (ret)
return ret;
ret = copy_Realm(&body->realm, &a->pkAuthenticator.kdcRealm);
if (ret)
return ret;
krb5_us_timeofday(context, &sec, &usec);
a->pkAuthenticator.ctime = sec;
a->pkAuthenticator.cusec = usec;
a->pkAuthenticator.nonce = nonce;
return 0;
}
static krb5_error_code
build_auth_pack_19(krb5_context context,
unsigned nonce,
const KDC_REQ_BODY *body,
AuthPack_19 *a)
{
size_t buf_size, len;
krb5_cksumtype cksum;
krb5_error_code ret;
void *buf;
krb5_timestamp sec;
int32_t usec;
krb5_clear_error_string(context);
/* XXX some PACKETCABLE needs implemetations need md5 */
cksum = CKSUMTYPE_RSA_MD5;
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,
cksum,
buf,
len,
&a->pkAuthenticator.paChecksum);
free(buf);
return ret;
}
static krb5_error_code
build_auth_pack(krb5_context context,
unsigned nonce,
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_string(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 == 0) {
ret = krb5_data_copy(&a->pkAuthenticator.paChecksum,
checksum.checksum.data, checksum.checksum.length);
free_Checksum(&checksum);
}
if (ret == 0 && dh) {
DomainParameters dp;
heim_integer dh_pub_key;
krb5_data buf;
size_t size;
ALLOC(a->clientPublicValue, 1);
if (a->clientPublicValue == NULL)
return ENOMEM;
ret = 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;
buf.length = length_heim_integer(&dh_pub_key);
buf.data = malloc(buf.length);
if (buf.data == NULL) {
free_heim_integer(&dh_pub_key);
krb5_set_error_string(context, "malloc: out of memory");
return ret;
}
ret = der_put_heim_integer((char *)buf.data + buf.length - 1,
buf.length, &dh_pub_key, &size);
free_heim_integer(&dh_pub_key);
if (ret) {
free(buf.data);
return ret;
}
if (size != buf.length)
krb5_abortx(context, "asn1 internal error");
a->clientPublicValue->subjectPublicKey.length = buf.length * 8;
a->clientPublicValue->subjectPublicKey.data = buf.data;
}
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 = 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,
int compat,
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;
PA_PK_AS_REQ req;
size_t size;
krb5_data buf, sd_buf;
int pa_type;
krb5_data_zero(&buf);
krb5_data_zero(&sd_buf);
memset(&req, 0, sizeof(req));
memset(&content_info, 0, sizeof(content_info));
if (compat == COMPAT_WIN2K) {
AuthPack_Win2k ap;
memset(&ap, 0, sizeof(ap));
ret = build_auth_pack_win2k(context, nonce, req_body, &ap);
if (ret) {
free_AuthPack_Win2k(&ap);
goto out;
}
ASN1_MALLOC_ENCODE(AuthPack_Win2k, buf.data, buf.length,
&ap, &size, ret);
free_AuthPack_Win2k(&ap);
if (ret) {
krb5_set_error_string(context, "AuthPack_Win2k: %d", ret);
goto out;
}
if (buf.length != size)
krb5_abortx(context, "internal ASN1 encoder error");
oid = oid_id_pkcs7_data();
} else if (compat == COMPAT_19) {
AuthPack_19 ap;
memset(&ap, 0, sizeof(ap));
ret = build_auth_pack_19(context, nonce, req_body, &ap);
if (ret) {
free_AuthPack_19(&ap);
goto out;
}
ASN1_MALLOC_ENCODE(AuthPack_19, buf.data, buf.length, &ap, &size, ret);
free_AuthPack_19(&ap);
if (ret) {
krb5_set_error_string(context, "AuthPack_19: %d", ret);
goto out;
}
if (buf.length != size)
krb5_abortx(context, "internal ASN1 encoder error");
oid = oid_id_pkauthdata();
} else if (compat == COMPAT_25) {
AuthPack ap;
memset(&ap, 0, sizeof(ap));
ret = build_auth_pack(context, nonce, 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_string(context, "AuthPack: %d", 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 = _krb5_pk_create_sign(context,
oid,
&buf,
ctx->id,
&sd_buf);
krb5_data_free(&buf);
if (ret)
goto out;
ret = _krb5_pk_mk_ContentInfo(context, &sd_buf, oid_id_pkcs7_signedData(),
&content_info);
krb5_data_free(&sd_buf);
if (ret)
goto out;
/* XXX tell the kdc what CAs the client is willing to accept */
req.trustedCertifiers = NULL;
req.kdcPkId = NULL;
if (compat == COMPAT_WIN2K) {
PA_PK_AS_REQ_Win2k winreq;
pa_type = KRB5_PADATA_PK_AS_REQ_WIN;
memset(&winreq, 0, sizeof(winreq));
ASN1_MALLOC_ENCODE(ContentInfo,
winreq.signed_auth_pack.data,
winreq.signed_auth_pack.length,
&content_info,
&size,
ret);
if (ret)
goto out;
if (winreq.signed_auth_pack.length != size)
krb5_abortx(context, "Internal ASN1 encoder error");
ASN1_MALLOC_ENCODE(PA_PK_AS_REQ_Win2k, buf.data, buf.length,
&winreq, &size, ret);
free_PA_PK_AS_REQ_Win2k(&winreq);
} else if (compat == COMPAT_19) {
PA_PK_AS_REQ_19 req_19;
pa_type = KRB5_PADATA_PK_AS_REQ_19;
memset(&req_19, 0, sizeof(req_19));
ret = copy_ContentInfo(&content_info, &req_19.signedAuthPack);
if (ret) {
krb5_clear_error_string(context);
goto out;
}
req_19.kdcCert = NULL;
req_19.trustedCertifiers = NULL;
req_19.encryptionCert = NULL;
ASN1_MALLOC_ENCODE(PA_PK_AS_REQ_19, buf.data, buf.length,
&req_19, &size, ret);
free_PA_PK_AS_REQ_19(&req_19);
} else if (compat == COMPAT_25) {
pa_type = KRB5_PADATA_PK_AS_REQ;
ASN1_MALLOC_ENCODE(ContentInfo,
req.signedAuthPack.data,
req.signedAuthPack.length,
&content_info,
&size,
ret);
if (ret)
goto out;
if (req.signedAuthPack.length != size)
krb5_abortx(context, "Internal ASN1 encoder error");
ASN1_MALLOC_ENCODE(PA_PK_AS_REQ, buf.data, buf.length,
&req, &size, ret);
} else
krb5_abortx(context, "internal pkinit error");
if (ret) {
krb5_set_error_string(context, "PA-PK-AS-REQ %d", 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);
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;
krb5_error_code ret;
size_t size;
krb5_data buf;
const char *provisioning_server;
int win2k_compat;
win2k_compat = krb5_config_get_bool_default(context, NULL,
FALSE,
"realms",
req_body->realm,
"win2k_pkinit",
NULL);
if (context->pkinit_flags & KRB5_PKINIT_WIN2K)
win2k_compat = 1;
if (win2k_compat) {
ret = pk_mk_padata(context, COMPAT_WIN2K, ctx, req_body, nonce, md);
if (ret)
goto out;
} else {
ret = pk_mk_padata(context, COMPAT_19, ctx, req_body, nonce, md);
if (ret)
goto out;
ret = pk_mk_padata(context, COMPAT_25, ctx, req_body, nonce, md);
if (ret)
goto out;
}
provisioning_server =
krb5_config_get_string(context, NULL,
"realms",
req_body->realm,
"packet-cable-provisioning-server",
NULL);
if (provisioning_server) {
/* PacketCable requires the PROV-SRV-LOCATION authenticator */
const PROV_SRV_LOCATION prov_server = (char *)provisioning_server;
ASN1_MALLOC_ENCODE(PROV_SRV_LOCATION, buf.data, buf.length,
&prov_server, &size, ret);
if (ret)
goto out;
if (buf.length != size)
krb5_abortx(context, "Internal ASN1 encoder error");
/* PacketCable uses -1 (application specific) as the auth data type */
ret = krb5_padata_add(context, md, -1, buf.data, buf.length);
if (ret)
free(buf.data);
}
out:
return ret;
}
static krb5_boolean
pk_peer_compare(krb5_context context,
const SignerIdentifier *peer1,
X509 *peer2)
{
switch (peer1->element) {
case choice_CMSIdentifier_issuerAndSerialNumber: {
ASN1_INTEGER *i;
const heim_integer *serial;
X509_NAME *name;
unsigned char *p;
size_t len;
i = X509_get_serialNumber(peer2);
serial = &peer1->u.issuerAndSerialNumber.serialNumber;
if (i->length != serial->length ||
memcmp(i->data, serial->data, i->length) != 0)
return FALSE;
p = peer1->u.issuerAndSerialNumber.issuer._save.data;
len = peer1->u.issuerAndSerialNumber.issuer._save.length;
name = d2i_X509_NAME(NULL, &p, len);
if (name == NULL)
return FALSE;
if (X509_NAME_cmp(name, X509_get_issuer_name(peer2)) != 0) {
X509_NAME_free(name);
return FALSE;
}
X509_NAME_free(name);
break;
}
case choice_CMSIdentifier_subjectKeyIdentifier:
return FALSE;
default:
return FALSE;
}
return TRUE;
}
static krb5_error_code
pk_decrypt_key(krb5_context context,
heim_octet_string *encrypted_key,
EVP_PKEY *priv_key,
krb5_keyblock *key)
{
int ret;
unsigned char *buf;
buf = malloc(EVP_PKEY_size(priv_key));
if (buf == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
ret = EVP_PKEY_decrypt(buf,
encrypted_key->data,
encrypted_key->length,
priv_key);
if (ret <= 0) {
free(buf);
krb5_set_error_string(context, "Can't decrypt key: %s",
ERR_error_string(ERR_get_error(), NULL));
return ENOMEM;
}
key->keytype = 0;
key->keyvalue.length = ret;
key->keyvalue.data = malloc(ret);
if (key->keyvalue.data == NULL) {
free(buf);
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
memcpy(key->keyvalue.data, buf, ret);
free(buf);
return 0;
}
static krb5_error_code
pk_verify_chain_standard(krb5_context context,
struct krb5_pk_identity *id,
const SignerIdentifier *client,
STACK_OF(X509) *chain,
X509 **client_cert)
{
X509_STORE *cert_store = NULL;
X509_STORE_CTX *store_ctx = NULL;
X509 *cert = NULL;
int i;
int ret;
ret = KRB5_KDC_ERROR_CLIENT_NAME_MISMATCH;
for (i = 0; i < sk_X509_num(chain); i++) {
cert = sk_X509_value(chain, i);
if (pk_peer_compare(context, client, cert) == TRUE) {
ret = 0;
break;
}
}
if (ret) {
krb5_set_error_string(context, "PKINIT: verify chain failed "
"to find client in chain");
return ret;
}
cert_store = X509_STORE_new();
if (cert_store == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "PKINIT: can't create X509 store: %s",
ERR_error_string(ERR_get_error(), NULL));
}
store_ctx = X509_STORE_CTX_new();
if (store_ctx == NULL) {
ret = ENOMEM;
krb5_set_error_string(context,
"PKINIT: can't create X509 store ctx: %s",
ERR_error_string(ERR_get_error(), NULL));
goto end;
}
X509_STORE_CTX_init(store_ctx, cert_store, cert, chain);
X509_STORE_CTX_trusted_stack(store_ctx, id->trusted_certs);
X509_verify_cert(store_ctx);
/* the last checked certificate is in store_ctx->current_cert */
krb5_clear_error_string(context);
switch(store_ctx->error) {
case X509_V_OK:
ret = 0;
break;
case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
ret = KRB5_KDC_ERROR_CANT_VERIFY_CERTIFICATE;
krb5_set_error_string(context, "PKINIT: failed to verify "
"certificate: %s ",
ERR_error_string(ERR_get_error(), NULL));
break;
case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
case X509_V_ERR_CERT_SIGNATURE_FAILURE:
case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
case X509_V_ERR_CERT_NOT_YET_VALID:
case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
case X509_V_ERR_CERT_HAS_EXPIRED:
ret = KRB5_KDC_ERROR_INVALID_CERTIFICATE;
krb5_set_error_string(context, "PKINIT: invalid certificate: %s ",
ERR_error_string(ERR_get_error(), NULL));
break;
case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
case X509_V_ERR_CERT_CHAIN_TOO_LONG:
case X509_V_ERR_PATH_LENGTH_EXCEEDED:
case X509_V_ERR_INVALID_CA:
ret = KRB5_KDC_ERROR_INVALID_CERTIFICATE;
krb5_set_error_string(context, "PKINIT: unknown CA or can't "
"verify certificate: %s",
ERR_error_string(ERR_get_error(), NULL));
break;
default:
ret = KRB5_KDC_ERROR_INVALID_CERTIFICATE; /* XXX */
krb5_set_error_string(context, "PKINIT: failed to verify "
"certificate: %s (%ld) ",
ERR_error_string(ERR_get_error(), NULL),
(long)store_ctx->error);
break;
}
if (ret)
goto end;
/*
* Since X509_verify_cert() doesn't do CRL checking at all, we have to
* perform own verification against CRLs
*/
#if 0
ret = pk_verify_crl(context, store_ctx, id->crls);
if (ret)
goto end;
#endif
if (client_cert && cert)
*client_cert = X509_dup(cert);
end:
if (cert_store)
X509_STORE_free(cert_store);
if (store_ctx)
X509_STORE_CTX_free(store_ctx);
return ret;
}
static int
cert_to_X509(krb5_context context, CertificateSetReal *set,
STACK_OF(X509_CRL) **certs)
{
krb5_error_code ret;
int i;
*certs = sk_X509_new_null();
ret = 0;
for (i = 0; i < set->len; i++) {
unsigned char *p;
X509 *cert;
p = set->val[i].data;
cert = d2i_X509(NULL, &p, set->val[i].length);
if (cert == NULL) {
ret = ASN1_BAD_FORMAT;
break;
}
sk_X509_insert(*certs, cert, i);
}
if (ret) {
krb5_set_error_string(context,
"PKINIT: Failed to decode certificate chain");
sk_X509_free(*certs);
*certs = NULL;
}
return ret;
}
static krb5_error_code
any_to_CertificateSet(krb5_context context, heim_any *cert,
CertificateSetReal *set)
{
size_t size, len, length;
heim_any *val;
int ret;
char *p;
set->len = 0;
set->val = NULL;
len = 0;
p = cert->data;
length = cert->length;
while (len < cert->length) {
val = realloc(set->val, (set->len + 1) * sizeof(set->val[0]));
if (val == NULL) {
ret = ENOMEM;
goto out;
}
set->val = val;
ret = decode_heim_any(p, length, &set->val[set->len], &size);
if (ret)
goto out;
set->len++;
p += size;
len += size;
length -= size;
}
return 0;
out:
krb5_clear_error_string(context);
free_CertificateSetReal(set);
set->val = NULL;
return ret;
}
krb5_error_code KRB5_LIB_FUNCTION
_krb5_pk_verify_sign(krb5_context context,
const char *data,
size_t length,
struct krb5_pk_identity *id,
heim_oid *contentType,
krb5_data *content,
struct krb5_pk_cert **signer)
{
STACK_OF(X509) *certificates;
SignerInfo *signer_info;
const EVP_MD *evp_type;
EVP_PKEY *public_key;
krb5_error_code ret;
CertificateSetReal set;
EVP_MD_CTX md;
X509 *cert;
SignedData sd;
size_t size;
*signer = NULL;
krb5_data_zero(content);
contentType->length = 0;
contentType->components = NULL;
memset(&sd, 0, sizeof(sd));
ret = decode_SignedData(data, length, &sd, &size);
if (ret) {
krb5_set_error_string(context,
"PKINIT: decoding failed SignedData: %d",
ret);
goto out;
}
if (sd.encapContentInfo.eContent == NULL) {
krb5_set_error_string(context,
"PKINIT: signature missing encapContent");
ret = KRB5KRB_AP_ERR_MSG_TYPE;
goto out;
}
/* XXX Check CMS version */
if (sd.signerInfos.len < 1) {
krb5_set_error_string(context,
"PKINIT: signature information missing from "
"pkinit response");
ret = KRB5_KDC_ERR_INVALID_SIG;
goto out;
}
signer_info = &sd.signerInfos.val[0];
ret = any_to_CertificateSet(context, sd.certificates, &set);
if (ret) {
krb5_set_error_string(context,
"PKINIT: failed to decode CertificateSet");
goto out;
}
ret = cert_to_X509(context, &set, &certificates);
free_CertificateSetReal(&set);
if (ret) {
krb5_set_error_string(context,
"PKINIT: failed to decode Certificates");
goto out;
}
ret = pk_verify_chain_standard(context, id,
&signer_info->sid,
certificates,
&cert);
sk_X509_free(certificates);
if (ret)
goto out;
if (signer_info->signature.length == 0) {
free_SignedData(&sd);
X509_free(cert);
krb5_set_error_string(context, "PKINIT: signature missing from"
"pkinit response");
return KRB5_KDC_ERR_INVALID_SIG;
}
public_key = X509_get_pubkey(cert);
/* verify signature */
if (heim_oid_cmp(&signer_info->digestAlgorithm.algorithm,
oid_id_pkcs1_sha1WithRSAEncryption()) == 0)
evp_type = EVP_sha1();
else if (heim_oid_cmp(&signer_info->digestAlgorithm.algorithm,
oid_id_pkcs1_md5WithRSAEncryption()) == 0)
evp_type = EVP_md5();
else if (heim_oid_cmp(&signer_info->digestAlgorithm.algorithm,
oid_id_secsig_sha_1()) == 0)
evp_type = EVP_sha1();
else {
X509_free(cert);
krb5_set_error_string(context, "PKINIT: The requested digest "
"algorithm is not supported");
ret = KRB5_KDC_ERR_INVALID_SIG;
goto out;
}
EVP_VerifyInit(&md, evp_type);
EVP_VerifyUpdate(&md,
sd.encapContentInfo.eContent->data,
sd.encapContentInfo.eContent->length);
ret = EVP_VerifyFinal(&md,
signer_info->signature.data,
signer_info->signature.length,
public_key);
if (ret != 1) {
X509_free(cert);
krb5_set_error_string(context, "PKINIT: signature didn't verify: %s",
ERR_error_string(ERR_get_error(), NULL));
ret = KRB5_KDC_ERR_INVALID_SIG;
goto out;
}
ret = copy_oid(&sd.encapContentInfo.eContentType, contentType);
if (ret) {
krb5_clear_error_string(context);
goto out;
}
content->data = malloc(sd.encapContentInfo.eContent->length);
if (content->data == NULL) {
krb5_clear_error_string(context);
ret = ENOMEM;
goto out;
}
content->length = sd.encapContentInfo.eContent->length;
memcpy(content->data,sd.encapContentInfo.eContent->data,content->length);
*signer = malloc(sizeof(**signer));
if (*signer == NULL) {
krb5_clear_error_string(context);
ret = ENOMEM;
goto out;
}
(*signer)->cert = cert;
out:
free_SignedData(&sd);
if (ret) {
free_oid(contentType);
krb5_data_free(content);
}
return ret;
}
static krb5_error_code
get_reply_key(krb5_context context,
const krb5_data *content,
unsigned nonce,
krb5_keyblock **key)
{
ReplyKeyPack_19 key_pack;
krb5_error_code ret;
size_t size;
ret = decode_ReplyKeyPack_19(content->data,
content->length,
&key_pack,
&size);
if (ret) {
krb5_set_error_string(context, "PKINIT decoding reply key failed");
free_ReplyKeyPack_19(&key_pack);
return ret;
}
if (key_pack.nonce != nonce) {
krb5_set_error_string(context, "PKINIT enckey nonce is wrong");
free_ReplyKeyPack_19(&key_pack);
return KRB5KRB_AP_ERR_MODIFIED;
}
*key = malloc (sizeof (**key));
if (*key == NULL) {
krb5_set_error_string(context, "PKINIT failed allocating reply key");
free_ReplyKeyPack_19(&key_pack);
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
ret = copy_EncryptionKey(&key_pack.replyKey, *key);
free_ReplyKeyPack_19(&key_pack);
if (ret) {
krb5_set_error_string(context, "PKINIT failed copying reply key");
free(*key);
}
return ret;
}
static krb5_error_code
pk_verify_host(krb5_context context, struct krb5_pk_cert *host)
{
/* XXX */
return 0;
}
static krb5_error_code
pk_rd_pa_reply_enckey(krb5_context context,
int win2k_compat,
ContentInfo *rep,
krb5_pk_init_ctx ctx,
krb5_enctype etype,
unsigned nonce,
PA_DATA *pa,
krb5_keyblock **key)
{
krb5_error_code ret;
EnvelopedData ed;
krb5_keyblock tmp_key;
krb5_crypto crypto;
krb5_data plain;
KeyTransRecipientInfo *ri;
int length;
size_t size;
X509 *user_cert;
char *p;
krb5_boolean bret;
krb5_data content;
heim_oid contentType = { 0, NULL };
struct krb5_pk_cert *host = NULL;
heim_octet_string encryptedContent;
heim_octet_string *any;
krb5_data ivec;
krb5_data params;
memset(&tmp_key, 0, sizeof(tmp_key));
memset(&ed, 0, sizeof(ed));
krb5_data_zero(&plain);
krb5_data_zero(&content);
krb5_data_zero(&encryptedContent);
krb5_data_zero(&ivec);
user_cert = sk_X509_value(ctx->id->cert, 0);
if (heim_oid_cmp(oid_id_pkcs7_envelopedData(), &rep->contentType)) {
krb5_set_error_string(context, "PKINIT: Invalid content type");
return EINVAL;
}
if (rep->content == NULL) {
krb5_set_error_string(context, "PKINIT: No content in reply");
return EINVAL;
}
ret = decode_EnvelopedData(rep->content->data,
rep->content->length,
&ed,
&size);
if (ret) {
free_EnvelopedData(&ed);
return ret;
}
if (ed.recipientInfos.len != 1) {
free_EnvelopedData(&ed);
krb5_set_error_string(context, "pkinit: Number of recipient infos "
"not one (%d)",
ed.recipientInfos.len);
return EINVAL; /* XXX */
}
ri = &ed.recipientInfos.val[0];
/* XXX make SignerIdentifier and RecipientIdentifier the same */
bret = pk_peer_compare(context, (SignerIdentifier *)&ri->rid, user_cert);
if (bret == FALSE) {
ret = KRB5KRB_AP_ERR_BADMATCH; /* XXX */
goto out;
}
if (heim_oid_cmp(oid_id_pkcs1_rsaEncryption(),
&ri->keyEncryptionAlgorithm.algorithm)) {
krb5_set_error_string(context, "PKINIT: invalid content type");
return EINVAL;
}
ret = pk_decrypt_key(context, &ri->encryptedKey,
ctx->id->private_key, &tmp_key);
if (ret)
goto out;
/* verify content type */
if (win2k_compat) {
if (heim_oid_cmp(&ed.encryptedContentInfo.contentType, oid_id_pkcs7_data())) {
ret = KRB5KRB_AP_ERR_MSG_TYPE;
goto out;
}
} else {
if (heim_oid_cmp(&ed.encryptedContentInfo.contentType, oid_id_pkcs7_signedData())) {
ret = KRB5KRB_AP_ERR_MSG_TYPE;
goto out;
}
}
if (ed.encryptedContentInfo.encryptedContent == NULL) {
krb5_set_error_string(context, "PKINIT: OPTIONAL encryptedContent "
"field not filled in in KDC reply");
ret = KRB5_BADMSGTYPE;
goto out;
}
any = ed.encryptedContentInfo.encryptedContent;
ret = der_get_octet_string(any->data, any->length,
&encryptedContent, NULL);
if (ret) {
krb5_set_error_string(context,
"PKINIT: encryptedContent content invalid");
goto out;
}
if (ed.encryptedContentInfo.contentEncryptionAlgorithm.parameters == NULL){
krb5_set_error_string(context,
"PKINIT: encryptedContent parameter missing");
ret = KRB5_BADMSGTYPE;
goto out;
}
params.data = ed.encryptedContentInfo.contentEncryptionAlgorithm.parameters->data;
params.length = ed.encryptedContentInfo.contentEncryptionAlgorithm.parameters->length;
ret = _krb5_oid_to_enctype(context,
&ed.encryptedContentInfo.contentEncryptionAlgorithm.algorithm,
&tmp_key.keytype);
if (ret)
goto out;
ret = krb5_crypto_init(context, &tmp_key, 0, &crypto);
if (ret)
goto out;
ret = krb5_crypto_get_params(context, crypto, &params, &ivec);
if (ret)
goto out;
ret = krb5_decrypt_ivec(context, crypto,
0,
encryptedContent.data,
encryptedContent.length,
&plain,
ivec.data);
p = plain.data;
length = plain.length;
/* win2k uses ContentInfo */
if (win2k_compat) {
ContentInfo ci;
size_t size;
ret = decode_ContentInfo(p, length, &ci, &size);
if (ret) {
krb5_set_error_string(context,
"PKINIT: failed decoding ContentInfo: %d",
ret);
goto out;
}
if (heim_oid_cmp(&ci.contentType, oid_id_pkcs7_signedData())) {
ret = EINVAL; /* XXX */
krb5_set_error_string(context, "PKINIT: Invalid content type");
goto out;
}
p = ci.content->data;
length = ci.content->length;
}
ret = _krb5_pk_verify_sign(context,
p,
length,
ctx->id,
&contentType,
&content,
&host);
if (ret)
goto out;
/* make sure that it is the kdc's certificate */
ret = pk_verify_host(context, host);
if (ret) {
krb5_set_error_string(context, "PKINIT: failed verify host: %d", ret);
goto out;
}
if (win2k_compat) {
if (heim_oid_cmp(&contentType, oid_id_pkcs7_data()) != 0) {
krb5_set_error_string(context, "PKINIT: reply key, wrong oid");
ret = KRB5KRB_AP_ERR_MSG_TYPE;
goto out;
}
} else {
if (heim_oid_cmp(&contentType, oid_id_pkrkeydata()) != 0) {
krb5_set_error_string(context, "PKINIT: reply key, wrong oid");
ret = KRB5KRB_AP_ERR_MSG_TYPE;
goto out;
}
}
ret = get_reply_key(context, &content, nonce, key);
if (ret)
goto out;
/* XXX compare given etype with key->etype */
out:
if (host)
_krb5_pk_cert_free(host);
free_oid(&contentType);
free_octet_string(&encryptedContent);
krb5_data_free(&content);
krb5_free_keyblock_contents(context, &tmp_key);
krb5_data_free(&plain);
krb5_data_free(&ivec);
return ret;
}
static krb5_error_code
pk_rd_pa_reply_dh(krb5_context context,
ContentInfo *rep,
krb5_pk_init_ctx ctx,
krb5_enctype etype,
unsigned nonce,
PA_DATA *pa,
krb5_keyblock **key)
{
unsigned char *p, *dh_gen_key = NULL;
ASN1_INTEGER *dh_pub_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 (heim_oid_cmp(oid_id_pkcs7_signedData(), &rep->contentType)) {
krb5_set_error_string(context, "PKINIT: Invalid content type");
return EINVAL;
}
if (rep->content == NULL) {
krb5_set_error_string(context, "PKINIT: No content in reply");
return EINVAL;
}
ret = _krb5_pk_verify_sign(context,
rep->content->data,
rep->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, host);
if (ret)
goto out;
if (heim_oid_cmp(&contentType, oid_id_pkdhkeydata())) {
ret = KRB5KRB_AP_ERR_MSG_TYPE; /* XXX */
goto out;
}
ret = decode_KDCDHKeyInfo(content.data,
content.length,
&kdc_dh_info,
&size);
if (ret)
goto out;
if (kdc_dh_info.nonce != nonce) {
krb5_set_error_string(context, "PKINIT: DH nonce is wrong");
ret = KRB5KRB_AP_ERR_MODIFIED;
goto out;
}
p = kdc_dh_info.subjectPublicKey.data;
size = (kdc_dh_info.subjectPublicKey.length + 7) / 8;
dh_pub_key = d2i_ASN1_INTEGER(NULL, &p, size);
if (dh_pub_key == NULL) {
krb5_set_error_string(context,
"PKINIT: Can't parse KDC's DH public key");
ret = KRB5KRB_ERR_GENERIC;
goto out;
}
kdc_dh_pubkey = ASN1_INTEGER_to_BN(dh_pub_key, NULL);
if (kdc_dh_pubkey == NULL) {
krb5_set_error_string(context,
"PKINIT: Can't convert KDC's DH public key");
ret = KRB5KRB_ERR_GENERIC;
goto out;
}
dh_gen_key = malloc(DH_size(ctx->dh));
if (dh_gen_key == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
ret = ENOMEM;
goto out;
}
dh_gen_keylen = DH_compute_key(dh_gen_key, kdc_dh_pubkey, ctx->dh);
if (dh_gen_keylen == -1) {
krb5_set_error_string(context,
"PKINIT: Can't compute Diffie-Hellman key (%s)",
ERR_error_string(ERR_get_error(), NULL));
ret = KRB5KRB_ERR_GENERIC;
goto out;
}
*key = malloc (sizeof (**key));
if (*key == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
ret = ENOMEM;
goto out;
}
ret = krb5_random_to_key(context, etype, dh_gen_key, dh_gen_keylen, *key);
if (ret) {
krb5_set_error_string(context,
"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 (dh_pub_key)
ASN1_INTEGER_free(dh_pub_key);
if (host)
_krb5_pk_cert_free(host);
if (content.data)
krb5_data_free(&content);
free_KDCDHKeyInfo(&kdc_dh_info);
return ret;
}
krb5_error_code KRB5_LIB_FUNCTION
_krb5_pk_rd_pa_reply(krb5_context context,
void *c,
krb5_enctype etype,
unsigned nonce,
PA_DATA *pa,
krb5_keyblock **key)
{
krb5_pk_init_ctx ctx = c;
krb5_error_code ret;
ContentInfo ci;
size_t size;
/* Check for PK-INIT -25 */
{
PA_PK_AS_REP rep;
memset(&rep, 0, sizeof(rep));
ret = decode_PA_PK_AS_REP(pa->padata_value.data,
pa->padata_value.length,
&rep,
&size);
if (ret == 0) {
switch (rep.element) {
case choice_PA_PK_AS_REP_encKeyPack:
ret = decode_ContentInfo(rep.u.encKeyPack.data,
rep.u.encKeyPack.length,
&ci,
&size);
if (ret) {
krb5_set_error_string(context,
"PKINIT: -25 decoding failed "
"ContentInfo: %d", ret);
return ret;
}
ret = pk_rd_pa_reply_enckey(context, 0, &ci, ctx,
etype, nonce, pa, key);
free_ContentInfo(&ci);
break;
default:
krb5_set_error_string(context, "PKINIT: -25 reply "
"invalid content type");
ret = EINVAL;
break;
}
}
free_PA_PK_AS_REP(&rep);
if (ret == 0)
return 0;
}
/* Check for PK-INIT -19 */
{
PA_PK_AS_REP_19 rep19;
memset(&rep19, 0, sizeof(rep19));
ret = decode_PA_PK_AS_REP_19(pa->padata_value.data,
pa->padata_value.length,
&rep19,
&size);
if (ret == 0) {
switch(rep19.element) {
case choice_PA_PK_AS_REP_19_dhSignedData:
ret = pk_rd_pa_reply_dh(context, &rep19.u.dhSignedData, ctx,
etype, nonce, pa, key);
break;
case choice_PA_PK_AS_REP_19_encKeyPack:
ret = pk_rd_pa_reply_enckey(context, 0,
&rep19.u.encKeyPack, ctx,
etype, nonce, pa, key);
break;
default:
krb5_set_error_string(context, "PKINIT: -19 reply invalid "
"content type");
ret = EINVAL;
break;
}
free_PA_PK_AS_REP_19(&rep19);
if (ret == 0)
return 0;
}
}
/* Check for Windows encoding of the AS-REP pa data */
{
PA_PK_AS_REP_Win2k w2krep;
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_string(context, "PKINIT: Failed decoding windows"
"pkinit reply %d", ret);
return ret;
}
switch (w2krep.element) {
case choice_PA_PK_AS_REP_Win2k_encKeyPack:
ret = decode_ContentInfo(w2krep.u.encKeyPack.data,
w2krep.u.encKeyPack.length,
&ci,
&size);
if (ret) {
krb5_set_error_string(context,
"PKINIT: decoding failed "
"ContentInfo: %d",
ret);
return ret;
}
ret = pk_rd_pa_reply_enckey(context, 1, &ci, ctx,
etype, nonce, pa, key);
free_ContentInfo(&ci);
break;
default:
krb5_set_error_string(context, "PKINIT: win2k reply invalid "
"content type");
ret = EINVAL;
break;
}
free_PA_PK_AS_REP_Win2k(&w2krep);
}
return ret;
}
static int
ssl_pass_cb(char *buf, int size, int rwflag, void *u)
{
krb5_error_code ret;
krb5_prompt prompt;
krb5_data password_data;
krb5_prompter_fct prompter = u;
password_data.data = buf;
password_data.length = size;
prompt.prompt = "Enter your private key passphrase: ";
prompt.hidden = 1;
prompt.reply = &password_data;
prompt.type = KRB5_PROMPT_TYPE_PASSWORD;
ret = (*prompter)(NULL, NULL, NULL, NULL, 1, &prompt);
if (ret) {
memset (buf, 0, size);
return 0;
}
return strlen(buf);
}
static krb5_error_code
load_openssl_cert(krb5_context context,
const char *file,
STACK_OF(X509) **c)
{
STACK_OF(X509) *certificate;
krb5_error_code ret;
FILE *f;
f = fopen(file, "r");
if (f == NULL) {
ret = errno;
krb5_set_error_string(context, "PKINIT: open failed %s: %s",
file, strerror(ret));
return ret;
}
certificate = sk_X509_new_null();
while (1) {
/* see http://www.openssl.org/docs/crypto/pem.html section BUGS */
X509 *cert;
cert = PEM_read_X509(f, NULL, NULL, NULL);
if (cert == NULL) {
if (ERR_GET_REASON(ERR_peek_error()) == PEM_R_NO_START_LINE) {
/* End of file reached. no error */
ERR_clear_error();
break;
}
krb5_set_error_string(context, "PKINIT: Can't read certificate");
fclose(f);
return HEIM_PKINIT_CERTIFICATE_INVALID;
}
sk_X509_insert(certificate, cert, sk_X509_num(certificate));
}
fclose(f);
if (sk_X509_num(certificate) == 0) {
krb5_set_error_string(context, "PKINIT: No certificate found");
return HEIM_PKINIT_NO_CERTIFICATE;
}
*c = certificate;
return 0;
}
static krb5_error_code
load_openssl_file(krb5_context context,
char *password,
krb5_prompter_fct prompter,
void *prompter_data,
const char *user_id,
struct krb5_pk_identity *id)
{
krb5_error_code ret;
STACK_OF(X509) *certificate = NULL;
char *cert_file = NULL, *key_file;
EVP_PKEY *private_key = NULL;
FILE *f;
cert_file = strdup(user_id);
if (cert_file == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
key_file = strchr(cert_file, ',');
if (key_file == NULL) {
krb5_set_error_string(context, "PKINIT: key file missing");
ret = HEIM_PKINIT_NO_PRIVATE_KEY;
goto out;
}
*key_file++ = '\0';
ret = load_openssl_cert(context, cert_file, &certificate);
if (ret)
goto out;
/* load private key */
f = fopen(key_file, "r");
if (f == NULL) {
ret = errno;
krb5_set_error_string(context, "PKINIT: open %s: %s",
key_file, strerror(ret));
goto out;
}
if (password == NULL || password[0] == '\0') {
if (prompter == NULL)
prompter = krb5_prompter_posix;
private_key = PEM_read_PrivateKey(f, NULL, ssl_pass_cb, prompter);
} else
private_key = PEM_read_PrivateKey(f, NULL, NULL, password);
fclose(f);
if (private_key == NULL) {
krb5_set_error_string(context, "PKINIT: Can't read private key");
ret = HEIM_PKINIT_PRIVATE_KEY_INVALID;
goto out;
}
ret = X509_check_private_key(sk_X509_value(certificate, 0), private_key);
if (ret != 1) {
ret = HEIM_PKINIT_PRIVATE_KEY_INVALID;
krb5_set_error_string(context,
"PKINIT: The private key doesn't match "
"the public key certificate");
goto out;
}
id->private_key = private_key;
id->cert = certificate;
return 0;
out:
if (cert_file)
free(cert_file);
if (certificate)
sk_X509_pop_free(certificate, X509_free);
if (private_key)
EVP_PKEY_free(private_key);
return ret;
}
static int
add_pair(krb5_context context, char *str, char ***cmds, int *num)
{
char **c;
char *p;
int i;
p = strchr(str, ':');
if (p) {
*p = '\0';
p++;
}
/* filter out dup keys */
for (i = 0; i < *num; i++)
if (strcmp((*cmds)[i * 2], str) == 0)
return 0;
c = realloc(*cmds, sizeof(*c) * ((*num + 1) * 2));
if (c == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
c[(*num * 2)] = str;
c[(*num * 2) + 1] = p;
*num += 1;
*cmds = c;
return 0;
}
static krb5_error_code
eval_pairs(krb5_context context, ENGINE *e, const char *name,
const char *type, char **cmds, int num)
{
int i;
for (i = 0; i < num; i++) {
char *a1 = cmds[i * 2], *a2 = cmds[(i * 2) + 1];
if(!ENGINE_ctrl_cmd_string(e, a1, a2, 0)) {
krb5_set_error_string(context,
"PKINIT: Failed %scommand (%s - %s:%s): %s",
type, name, a1, a2 ? a2 : "(NULL)",
ERR_error_string(ERR_get_error(), NULL));
return HEIM_PKINIT_NO_PRIVATE_KEY;
}
}
return 0;
}
struct engine_context {
char **pre_cmds;
char **post_cmds;
int num_pre;
int num_post;
char *engine_name;
char *cert_file;
char *key_id;
};
static krb5_error_code
parse_openssl_engine_conf(krb5_context context,
struct engine_context *ctx,
char *line)
{
krb5_error_code ret;
char *last, *p, *q;
for (p = strtok_r(line, ",", &last);
p != NULL;
p = strtok_r(NULL, ",", &last)) {
q = strchr(p, '=');
if (q == NULL) {
krb5_set_error_string(context,
"PKINIT: openssl engine configuration "
"key %s missing = and thus value", p);
return HEIM_PKINIT_NO_PRIVATE_KEY;
}
*q = '\0';
q++;
if (strcasecmp("PRE", p) == 0) {
ret = add_pair(context, q, &ctx->pre_cmds, &ctx->num_pre);
if (ret)
return ret;
} else if (strcasecmp("POST", p) == 0) {
ret = add_pair(context, q, &ctx->post_cmds, &ctx->num_post);
if (ret)
return ret;
} else if (strcasecmp("KEY", p) == 0) {
ctx->key_id = q;
} else if (strcasecmp("CERT", p) == 0) {
ctx->cert_file = q;
} else if (strcasecmp("ENGINE", p) == 0) {
ctx->engine_name = q;
} else {
krb5_set_error_string(context,
"PKINIT: openssl engine configuration "
"key %s is unknown", p);
return HEIM_PKINIT_NO_PRIVATE_KEY;
}
}
return 0;
}
static krb5_error_code
load_openssl_engine(krb5_context context,
char *password,
krb5_prompter_fct prompter,
void *prompter_data,
const char *string,
struct krb5_pk_identity *id)
{
struct engine_context ctx;
krb5_error_code ret;
const char *f;
char *file_conf = NULL, *user_conf = NULL;
ENGINE *e = NULL;
memset(&ctx, 0, sizeof(ctx));
ENGINE_load_builtin_engines();
user_conf = strdup(string);
if (user_conf == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
ret = parse_openssl_engine_conf(context, &ctx, user_conf);
if (ret)
goto out;
f = krb5_config_get_string_default(context, NULL, NULL,
"libdefaults",
"pkinit-openssl-engine",
NULL);
if (f) {
file_conf = strdup(f);
if (file_conf) {
ret = parse_openssl_engine_conf(context, &ctx, file_conf);
if (ret)
goto out;
}
}
if (ctx.cert_file == NULL) {
krb5_set_error_string(context,
"PKINIT: openssl engine missing certificate");
ret = HEIM_PKINIT_NO_CERTIFICATE;
goto out;
}
if (ctx.key_id == NULL) {
krb5_set_error_string(context,
"PKINIT: openssl engine missing key id");
ret = HEIM_PKINIT_NO_PRIVATE_KEY;
goto out;
}
if (ctx.engine_name == NULL) {
krb5_set_error_string(context,
"PKINIT: openssl engine missing engine name");
ret = HEIM_PKINIT_NO_PRIVATE_KEY;
goto out;
}
e = ENGINE_by_id(ctx.engine_name);
if (e == NULL) {
krb5_set_error_string(context,
"PKINIT: failed getting openssl engine %s: %s",
ctx.engine_name,
ERR_error_string(ERR_get_error(), NULL));
ret = HEIM_PKINIT_NO_PRIVATE_KEY;
goto out;
}
ret = eval_pairs(context, e, ctx.engine_name, "pre",
ctx.pre_cmds, ctx.num_pre);
if (ret)
goto out;
if(!ENGINE_init(e)) {
ret = HEIM_PKINIT_NO_PRIVATE_KEY;
krb5_set_error_string(context,
"PKINIT: openssl engine init %s failed: %s",
ctx.engine_name,
ERR_error_string(ERR_get_error(), NULL));
ENGINE_free(e);
goto out;
}
ret = eval_pairs(context, e, ctx.engine_name, "post",
ctx.post_cmds, ctx.num_post);
if (ret)
goto out;
/*
* If the engine supports a LOAD_CERT_CTRL function, lets try
* it. OpenSC support this function. Eventially this should be
* a ENGINE_load_cert function if it failes, treat it like a
* non fatal error.
*/
{
struct {
const char * cert_id;
X509 * cert;
} parms;
parms.cert_id = ctx.cert_file;
parms.cert = NULL;
ENGINE_ctrl_cmd(e, "LOAD_CERT_CTRL", 0, &parms, NULL, 1);
if (parms.cert) {
id->cert = sk_X509_new_null();
sk_X509_insert(id->cert, parms.cert, 0);
}
}
if (id->cert == NULL) {
ret = load_openssl_cert(context, ctx.cert_file, &id->cert);
if (ret)
goto out;
}
{
UI_METHOD * krb5_ui_method = NULL;
struct krb5_ui_data ui_data;
krb5_ui_method = UI_create_method("Krb5 ui method");
if (krb5_ui_method == NULL) {
krb5_set_error_string(context,
"PKINIT: failed to setup prompter "
"function: %s",
ERR_error_string(ERR_get_error(), NULL));
ret = HEIM_PKINIT_NO_PRIVATE_KEY;
goto out;
}
UI_method_set_reader(krb5_ui_method, krb5_ui_method_read_string);
ui_data.context = context;
ui_data.prompter = prompter;
if (prompter == NULL)
ui_data.prompter = krb5_prompter_posix;
ui_data.prompter_data = prompter_data;
id->private_key = ENGINE_load_private_key(e,
ctx.key_id,
krb5_ui_method,
(void*) &ui_data);
UI_destroy_method(krb5_ui_method);
}
if (id->private_key == NULL) {
krb5_set_error_string(context,
"PKINIT: failed to load private key: %s",
ERR_error_string(ERR_get_error(), NULL));
ret = HEIM_PKINIT_NO_PRIVATE_KEY;
goto out;
}
ret = X509_check_private_key(sk_X509_value(id->cert, 0), id->private_key);
if (ret != 1) {
ret = HEIM_PKINIT_PRIVATE_KEY_INVALID;
krb5_set_error_string(context,
"PKINIT: The private key doesn't match "
"the public key certificate");
goto out;
}
if (user_conf)
free(user_conf);
if (file_conf)
free(file_conf);
id->engine = e;
return 0;
out:
if (user_conf)
free(user_conf);
if (file_conf)
free(file_conf);
if (e) {
ENGINE_finish(e); /* make sure all shared libs are unloaded */
ENGINE_free(e);
}
return ret;
}
krb5_error_code KRB5_LIB_FUNCTION
_krb5_pk_load_openssl_id(krb5_context context,
struct krb5_pk_identity **ret_id,
const char *user_id,
const char *x509_anchors,
krb5_prompter_fct prompter,
void *prompter_data,
char *password)
{
STACK_OF(X509) *trusted_certs = NULL;
struct krb5_pk_identity *id = NULL;
krb5_error_code ret;
struct dirent *file;
char *dirname = NULL;
DIR *dir;
FILE *f;
krb5_error_code (*load_pair)(krb5_context,
char *,
krb5_prompter_fct prompter,
void * prompter_data,
const char *,
struct krb5_pk_identity *) = NULL;
*ret_id = NULL;
if (x509_anchors == NULL) {
krb5_set_error_string(context, "PKINIT: No root ca directory given");
return HEIM_PKINIT_NO_VALID_CA;
}
if (user_id == NULL) {
krb5_set_error_string(context,
"PKINIT: No user X509 source given given");
return HEIM_PKINIT_NO_PRIVATE_KEY;
}
/*
*
*/
if (strncasecmp(user_id, "FILE:", 5) == 0) {
load_pair = load_openssl_file;
user_id += 5;
} else if (strncasecmp(user_id, "ENGINE:", 7) == 0) {
load_pair = load_openssl_engine;
user_id += 7;
} else {
krb5_set_error_string(context, "PKINIT: user identity not FILE");
return HEIM_PKINIT_NO_CERTIFICATE;
}
if (strncasecmp(x509_anchors, "OPENSSL-ANCHOR-DIR:", 19) != 0) {
krb5_set_error_string(context, "PKINIT: anchor OPENSSL-ANCHOR-DIR");
return HEIM_PKINIT_NO_VALID_CA;
}
x509_anchors += 19;
id = malloc(sizeof(*id));
if (id == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
ret = ENOMEM;
goto out;
}
memset(id, 0, sizeof(*id));
OpenSSL_add_all_algorithms();
ERR_load_crypto_strings();
ret = (*load_pair)(context, password, prompter, prompter_data, user_id, id);
if (ret)
goto out;
/* load anchors */
dirname = strdup(x509_anchors);
if (dirname == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
ret = ENOMEM;
goto out;
}
{
size_t len;
len = strlen(dirname);
if (dirname[len - 1] == '/')
dirname[len - 1] = '\0';
}
/* read ca certificates */
dir = opendir(dirname);
if (dir == NULL) {
ret = errno;
krb5_set_error_string(context, "PKINIT: open directory %s: %s",
dirname, strerror(ret));
goto out;
}
trusted_certs = sk_X509_new_null();
while ((file = readdir(dir)) != NULL) {
X509 *cert;
char *filename;
/*
* Assume the certificate filenames constist of hashed subject
* name followed by suffix ".0"
*/
if (strlen(file->d_name) == 10 && strcmp(&file->d_name[8],".0") == 0) {
asprintf(&filename, "%s/%s", dirname, file->d_name);
if (filename == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out or memory");
goto out;
}
f = fopen(filename, "r");
if (f == NULL) {
ret = errno;
krb5_set_error_string(context, "PKINIT: open %s: %s",
filename, strerror(ret));
free(filename);
closedir(dir);
goto out;
}
cert = PEM_read_X509(f, NULL, NULL, NULL);
fclose(f);
if (cert != NULL) {
/* order of the certs is not important */
sk_X509_push(trusted_certs, cert);
}
free(filename);
}
}
closedir(dir);
if (sk_X509_num(trusted_certs) == 0) {
krb5_set_error_string(context,
"PKINIT: No CA certificate(s) found in %s",
dirname);
ret = HEIM_PKINIT_NO_VALID_CA;
goto out;
}
id->trusted_certs = trusted_certs;
*ret_id = id;
return 0;
out:
if (dirname)
free(dirname);
if (trusted_certs)
sk_X509_pop_free(trusted_certs, X509_free);
if (id) {
if (id->cert)
sk_X509_pop_free(id->cert, X509_free);
if (id->private_key)
EVP_PKEY_free(id->private_key);
free(id);
}
return ret;
}
#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->private == NULL || opt->private->pk_init_ctx == NULL)
return;
ctx = opt->private->pk_init_ctx;
if (ctx->dh)
DH_free(ctx->dh);
ctx->dh = NULL;
if (ctx->id) {
if (ctx->id->cert)
sk_X509_pop_free(ctx->id->cert, X509_free);
if (ctx->id->trusted_certs)
sk_X509_pop_free(ctx->id->trusted_certs, X509_free);
if (ctx->id->private_key)
EVP_PKEY_free(ctx->id->private_key);
if (ctx->id->engine) {
ENGINE_finish(ctx->id->engine); /* unload shared libs etc */
ENGINE_free(ctx->id->engine);
ctx->id->engine = NULL;
}
free(ctx->id);
ctx->id = NULL;
}
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,
int flags,
krb5_prompter_fct prompter,
void *prompter_data,
char *password)
{
#ifdef PKINIT
krb5_error_code ret;
if (opt->private == NULL) {
krb5_set_error_string(context, "PKINIT: on non extendable opt");
return EINVAL;
}
opt->private->pk_init_ctx = malloc(sizeof(*opt->private->pk_init_ctx));
if (opt->private->pk_init_ctx == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
opt->private->pk_init_ctx->dh = NULL;
opt->private->pk_init_ctx->id = NULL;
ret = _krb5_pk_load_openssl_id(context,
&opt->private->pk_init_ctx->id,
user_id,
x509_anchors,
prompter,
prompter_data,
password);
if (ret) {
free(opt->private->pk_init_ctx);
opt->private->pk_init_ctx = NULL;
}
/* XXX */
if (ret == 0 && (flags & 1) && !(flags & 2)) {
DH *dh;
const char *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";
const char *G = "2";
const char *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";
dh = DH_new();
if (dh == NULL) {
_krb5_get_init_creds_opt_free_pkinit(opt);
return ENOMEM;
}
opt->private->pk_init_ctx->dh = dh;
if (!BN_hex2bn(&dh->p, P)) {
_krb5_get_init_creds_opt_free_pkinit(opt);
return ENOMEM;
}
if (!BN_hex2bn(&dh->g, G)) {
_krb5_get_init_creds_opt_free_pkinit(opt);
return ENOMEM;
}
if (!BN_hex2bn(&dh->q, Q)) {
_krb5_get_init_creds_opt_free_pkinit(opt);
return ENOMEM;
}
/* XXX generate a new key for each request ? */
if (DH_generate_key(dh) != 1) {
_krb5_get_init_creds_opt_free_pkinit(opt);
return ENOMEM;
}
}
return ret;
#else
krb5_set_error_string(context, "no support for PKINIT compiled in");
return EINVAL;
#endif
}
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