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/*
Copyright (C) 2013 Simo Sorce <simo@samba.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gssapi/gssapi.h>
#include <gssapi/gssapi_ext.h>
#include "gss_ntlmssp.h"
static int get_initial_creds(struct gssntlm_name *name,
struct gssntlm_cred **creds)
{
struct gssntlm_cred *cred = NULL;
const char *envvar;
char line[1024];
char *dom, *usr, *pwd;
char *p;
bool found = false;
FILE *f;
int ret;
/* use the same var used by Heimdal */
envvar = getenv("NTLM_USER_FILE");
if (envvar != NULL) {
/* Use the same file format used by Heimdal in hope to achieve
* some compatibility between implementations:
* Each line is one entry like the following:
* DOMAIN:USERNAME:PASSWORD */
f = fopen(envvar, "r");
if (!f) return errno;
while(fgets(line, 1024, f)) {
p = line;
if (*p == '#') continue;
dom = p;
p = strchr(dom, ':');
if (!p) continue;
*p++ = '\0';
usr = p;
p = strchr(usr, ':');
if (!p) continue;
*p++ = '\0';
pwd = p;
strsep(&p, "\r\n");
/* if no name is specified user the first found */
if (name == NULL) {
found = true;
break;
}
if (name->data.user.domain) {
if (!ntlm_casecmp(dom, name->data.user.domain)) continue;
}
if (name->data.user.name) {
if (!ntlm_casecmp(usr, name->data.user.name)) continue;
}
/* all matched (NULLs in name are wildcards) */
found = true;
break;
}
fclose(f);
if (found) {
cred = calloc(1, sizeof(struct gssntlm_cred));
if (!cred) return errno;
cred->type = GSSNTLM_CRED_USER;
cred->cred.user.user.type = GSSNTLM_NAME_USER;
cred->cred.user.user.data.user.domain = strdup(dom);
if (!cred->cred.user.user.data.user.domain) {
ret = ENOMEM;
goto done;
}
cred->cred.user.user.data.user.name = strdup(usr);
if (!cred->cred.user.user.data.user.name) {
ret = ENOMEM;
goto done;
}
cred->cred.user.nt_hash.length = 16;
ret = NTOWFv1(pwd, &cred->cred.user.nt_hash);
goto done;
}
}
ret = ENOENT;
done:
if (ret) {
gssntlm_int_release_cred(cred);
} else {
*creds = cred;
}
return ret;
}
static void gssntlm_copy_key(struct ntlm_key *dest, struct ntlm_key *src)
{
memcpy(dest->data, src->data, src->length);
dest->length = src->length;
}
int gssntlm_copy_creds(struct gssntlm_cred *in, struct gssntlm_cred *out)
{
char *dom = NULL, *usr = NULL;
int ret = 0;
out->type = GSSNTLM_CRED_NONE;
switch (in->type) {
case GSSNTLM_CRED_NONE:
break;
case GSSNTLM_CRED_ANON:
out->cred.anon.dummy = 1;
break;
case GSSNTLM_CRED_USER:
dom = strdup(in->cred.user.user.data.user.domain);
if (!dom) {
ret = ENOMEM;
goto done;
}
usr = strdup(in->cred.user.user.data.user.name);
if (!usr) {
ret = ENOMEM;
goto done;
}
out->cred.user.user.data.user.domain = dom;
out->cred.user.user.data.user.name = usr;
gssntlm_copy_key(&out->cred.user.nt_hash,
&in->cred.user.nt_hash);
gssntlm_copy_key(&out->cred.user.lm_hash,
&in->cred.user.lm_hash);
break;
case GSSNTLM_CRED_SERVER:
out->cred.server.dummy = 1;
break;
}
out->type = in->type;
out->lm_compatibility_level = in->lm_compatibility_level;
done:
if (ret) {
safefree(dom);
safefree(usr);
}
return ret;
}
void gssntlm_int_release_cred(struct gssntlm_cred *cred)
{
if (!cred) return;
switch (cred->type) {
case GSSNTLM_CRED_NONE:
break;
case GSSNTLM_CRED_ANON:
cred->cred.anon.dummy = 0;
break;
case GSSNTLM_CRED_USER:
safefree(cred->cred.user.user.data.user.domain);
safefree(cred->cred.user.user.data.user.name);
safezero(cred->cred.user.nt_hash.data, 16);
cred->cred.user.nt_hash.length = 0;
safezero(cred->cred.user.lm_hash.data, 16);
cred->cred.user.lm_hash.length = 0;
break;
case GSSNTLM_CRED_SERVER:
cred->cred.server.dummy = 0;
break;
}
}
uint32_t gssntlm_acquire_cred(uint32_t *minor_status,
gss_name_t desired_name,
uint32_t time_req,
gss_OID_set desired_mechs,
gss_cred_usage_t cred_usage,
gss_cred_id_t *output_cred_handle,
gss_OID_set *actual_mechs,
uint32_t *time_rec)
{
struct gssntlm_cred *cred;
struct gssntlm_name *name;
uint32_t retmaj = GSS_S_COMPLETE;
uint32_t retmin = 0;
name = (struct gssntlm_name *)desired_name;
if (cred_usage == GSS_C_BOTH || cred_usage == GSS_C_INITIATE) {
if (name != NULL && name->type != GSSNTLM_NAME_USER) {
retmin = EINVAL;
retmaj = GSS_S_CRED_UNAVAIL;
goto done;
}
retmin = get_initial_creds(name, &cred);
if (retmin) {
retmaj = GSS_S_CRED_UNAVAIL;
}
} else {
retmin = EINVAL;
retmaj = GSS_S_CRED_UNAVAIL;
}
done:
if (retmaj) {
uint32_t tmpmin;
gssntlm_release_cred(&tmpmin, (gss_cred_id_t *)&cred);
} else {
*output_cred_handle = (gss_cred_id_t)cred;
}
*minor_status = retmin;
return retmaj;
}
uint32_t gssntlm_release_cred(uint32_t *minor_status,
gss_cred_id_t *cred_handle)
{
*minor_status = 0;
if (!cred_handle) return GSS_S_COMPLETE;
gssntlm_int_release_cred((struct gssntlm_cred *)*cred_handle);
safefree(*cred_handle);
return GSS_S_COMPLETE;
}
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