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/*
* NAME
* cred.c
*
* DESCRIPTION
* Provide an interface to assemble and disassemble krb5_cred
* structures.
*
*/
#include <k5-int.h>
#include "cleanup.h"
#include "auth_con.h"
#include <stddef.h> /* NULL */
#include <stdlib.h> /* malloc */
#include <errno.h> /* ENOMEM */
/*-------------------- encrypt_credencpart --------------------*/
/*
* encrypt the enc_part of krb5_cred
*/
static krb5_error_code
encrypt_credencpart(context, pcredpart, pkeyblock, pencdata)
krb5_context context;
krb5_cred_enc_part * pcredpart;
krb5_keyblock * pkeyblock;
krb5_enc_data * pencdata;
{
krb5_error_code retval;
krb5_encrypt_block eblock;
krb5_data * scratch;
if (!valid_etype(pkeyblock->etype))
return KRB5_PROG_ETYPE_NOSUPP;
/* start by encoding to-be-encrypted part of the message */
if ((retval = encode_krb5_enc_cred_part(pcredpart, &scratch)))
return retval;
/* put together an eblock for this encryption */
pencdata->kvno = 0;
pencdata->etype = pkeyblock->etype;
krb5_use_cstype(context, &eblock, pkeyblock->etype);
pencdata->ciphertext.length = krb5_encrypt_size(scratch->length,
eblock.crypto_entry);
/* add padding area, and zero it */
if (!(scratch->data = (char *)realloc(scratch->data,
pencdata->ciphertext.length))) {
/* may destroy scratch->data */
krb5_xfree(scratch);
return ENOMEM;
}
memset(scratch->data + scratch->length, 0,
pencdata->ciphertext.length - scratch->length);
if (!(pencdata->ciphertext.data =
(char *)malloc(pencdata->ciphertext.length))) {
retval = ENOMEM;
goto clean_scratch;
}
/* do any necessary key pre-processing */
if ((retval = krb5_process_key(context, &eblock, pkeyblock))) {
goto clean_encpart;
}
/* call the encryption routine */
if ((retval = krb5_encrypt(context, (krb5_pointer)scratch->data,
(krb5_pointer)pencdata->ciphertext.data,
scratch->length, &eblock, 0))) {
krb5_finish_key(context, &eblock);
goto clean_encpart;
}
retval = krb5_finish_key(context, &eblock);
clean_encpart:
if (retval) {
memset(pencdata->ciphertext.data, 0, pencdata->ciphertext.length);
free(pencdata->ciphertext.data);
pencdata->ciphertext.length = 0;
pencdata->ciphertext.data = 0;
}
clean_scratch:
memset(scratch->data, 0, scratch->length);
krb5_free_data(context, scratch);
return retval;
}
/*----------------------- krb5_mk_ncred_basic -----------------------*/
static krb5_error_code
krb5_mk_ncred_basic(context, ppcreds, nppcreds, keyblock,
replaydata, local_addr, remote_addr, pcred)
krb5_context context;
krb5_creds ** ppcreds;
krb5_int32 nppcreds;
krb5_keyblock * keyblock;
krb5_replay_data * replaydata;
krb5_address * local_addr;
krb5_address * remote_addr;
krb5_cred * pcred;
{
krb5_cred_enc_part credenc;
krb5_error_code retval;
char * tmp;
int i;
credenc.magic = KV5M_CRED_ENC_PART;
credenc.s_address = local_addr;
credenc.r_address = remote_addr;
credenc.nonce = replaydata->seq;
credenc.usec = replaydata->usec;
credenc.timestamp = replaydata->timestamp;
/* Get memory for creds and initialize it */
if ((credenc.ticket_info = (krb5_cred_info **)
malloc((size_t) (sizeof(krb5_cred_info *) * (nppcreds + 1)))) == NULL) {
return ENOMEM;
}
if ((tmp = (char *)malloc((size_t) (sizeof(krb5_cred_info) * nppcreds))) == NULL) {
retval = ENOMEM;
goto cleanup_info;
}
memset(tmp, 0, (size_t) (sizeof(krb5_cred_info) * nppcreds));
/*
* For each credential in the list, initialize a cred info
* structure and copy the ticket into the ticket list.
*/
for (i = 0; i < nppcreds; i++) {
credenc.ticket_info[i] = (krb5_cred_info *)tmp + i;
credenc.ticket_info[i]->magic = KV5M_CRED_INFO;
credenc.ticket_info[i]->times = ppcreds[i]->times;
credenc.ticket_info[i]->flags = ppcreds[i]->ticket_flags;
if ((retval = decode_krb5_ticket(&ppcreds[i]->ticket,
&pcred->tickets[i])))
goto cleanup_info_ptrs;
if ((retval = krb5_copy_keyblock(context, &ppcreds[i]->keyblock,
&credenc.ticket_info[i]->session)))
goto cleanup_info_ptrs;
if ((retval = krb5_copy_principal(context, ppcreds[i]->client,
&credenc.ticket_info[i]->client)))
goto cleanup_info_ptrs;
if ((retval = krb5_copy_principal(context, ppcreds[i]->server,
&credenc.ticket_info[i]->server)))
goto cleanup_info_ptrs;
if ((retval = krb5_copy_addresses(context, ppcreds[i]->addresses,
&credenc.ticket_info[i]->caddrs)))
goto cleanup_info_ptrs;
}
/*
* NULL terminate the lists.
*/
credenc.ticket_info[i] = NULL;
pcred->tickets[i] = NULL;
retval = encrypt_credencpart(context, &credenc, keyblock, &pcred->enc_part);
cleanup_info_ptrs:
free(tmp);
cleanup_info:
free(credenc.ticket_info);
return retval;
}
/*----------------------- krb5_mk_ncred -----------------------*/
/*
* This functions takes as input an array of krb5_credentials, and
* outputs an encoded KRB_CRED message suitable for krb5_rd_cred
*/
krb5_error_code INTERFACE
krb5_mk_ncred(context, auth_context, ppcreds, ppdata, outdata)
krb5_context context;
krb5_auth_context * auth_context;
krb5_creds ** ppcreds;
krb5_data ** ppdata;
krb5_replay_data * outdata;
{
krb5_error_code retval;
krb5_keyblock * keyblock;
krb5_replay_data replaydata;
krb5_cred * pcred;
int ncred;
if (ppcreds == NULL) {
return KRB5KRB_AP_ERR_BADADDR;
}
/*
* Allocate memory for a NULL terminated list of tickets.
*/
for (ncred = 0; ppcreds[ncred]; ncred++);
if ((pcred = (krb5_cred *)malloc(sizeof(krb5_cred))) == NULL)
return ENOMEM;
if ((pcred->tickets
= (krb5_ticket **)malloc(sizeof(krb5_ticket *) * (ncred + 1))) == NULL) {
retval = ENOMEM;
free(pcred);
}
/* Get keyblock */
if ((keyblock = auth_context->local_subkey) == NULL)
if ((keyblock = auth_context->remote_subkey) == NULL)
keyblock = auth_context->keyblock;
/* Get replay info */
if ((auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_DO_TIME) &&
(auth_context->rcache == NULL))
return KRB5_RC_REQUIRED;
if (((auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_RET_TIME) ||
(auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_RET_SEQUENCE)) &&
(outdata == NULL))
/* Need a better error */
return KRB5_RC_REQUIRED;
if ((auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_DO_TIME) ||
(auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_RET_TIME)) {
if ((retval = krb5_us_timeofday(context, &replaydata.timestamp,
&replaydata.usec)))
return retval;
if (auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_RET_TIME) {
outdata->timestamp = replaydata.timestamp;
outdata->usec = replaydata.usec;
}
if (auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_RET_TIME) {
outdata->timestamp = replaydata.timestamp;
outdata->usec = replaydata.usec;
}
}
if ((auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) ||
(auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_RET_SEQUENCE)) {
replaydata.seq = auth_context->local_seq_number;
if (auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) {
auth_context->local_seq_number++;
} else {
outdata->seq = replaydata.seq;
}
}
{
krb5_address * premote_fulladdr = NULL;
krb5_address * plocal_fulladdr = NULL;
krb5_address remote_fulladdr;
krb5_address local_fulladdr;
CLEANUP_INIT(2);
if (auth_context->local_addr) {
if (auth_context->local_port) {
if (!(retval = krb5_make_fulladdr(context, auth_context->local_addr,
auth_context->local_port,
&local_fulladdr))) {
CLEANUP_PUSH(local_fulladdr.contents, free);
plocal_fulladdr = &local_fulladdr;
} else {
goto error;
}
} else {
plocal_fulladdr = auth_context->local_addr;
}
}
if (auth_context->remote_addr) {
if (auth_context->remote_port) {
if (!(retval = krb5_make_fulladdr(context,auth_context->remote_addr,
auth_context->remote_port,
&remote_fulladdr))){
CLEANUP_PUSH(remote_fulladdr.contents, free);
premote_fulladdr = &remote_fulladdr;
} else {
CLEANUP_DONE();
goto error;
}
} else {
premote_fulladdr = auth_context->remote_addr;
}
}
/* Setup creds structure */
if ((retval = krb5_mk_ncred_basic(context, ppcreds, ncred, keyblock,
&replaydata, plocal_fulladdr,
premote_fulladdr, pcred))) {
CLEANUP_DONE();
goto error;
}
CLEANUP_DONE();
}
if (auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_DO_TIME) {
krb5_donot_replay replay;
if ((retval = krb5_gen_replay_name(context, auth_context->local_addr,
"_forw", &replay.client)))
goto error;
replay.server = ""; /* XXX */
replay.cusec = replaydata.usec;
replay.ctime = replaydata.timestamp;
if ((retval = krb5_rc_store(context, auth_context->rcache, &replay))) {
/* should we really error out here? XXX */
krb5_xfree(replay.client);
goto error;
}
krb5_xfree(replay.client);
}
/* Encode creds structure */
retval = encode_krb5_cred(pcred, ppdata);
error:
if (retval) {
if ((auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE)
|| (auth_context->auth_context_flags & KRB5_AUTH_CONTEXT_RET_SEQUENCE))
auth_context->local_seq_number--;
free(pcred->tickets);
free(pcred);
}
return retval;
}
/*----------------------- krb5_mk_1cred -----------------------*/
/*
* A convenience function that calls krb5_mk_ncred.
*/
krb5_error_code INTERFACE
krb5_mk_1cred(context, auth_context, pcreds, ppdata, outdata)
krb5_context context;
krb5_auth_context * auth_context;
krb5_creds * pcreds;
krb5_data ** ppdata;
krb5_replay_data * outdata;
{
krb5_error_code retval;
krb5_creds **ppcreds;
if ((ppcreds = (krb5_creds **)malloc(sizeof(*ppcreds) * 2)) == NULL) {
return ENOMEM;
}
ppcreds[0] = pcreds;
ppcreds[1] = NULL;
if ((retval = krb5_mk_ncred(context, auth_context, ppcreds,
ppdata, outdata)))
free(ppcreds);
return retval;
}
|