/*-
* Copyright (c) 2005 Doug Rabson
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD: src/lib/libgssapi/gss_mech_switch.c,v 1.2 2006/02/04 09:40:21 dfr Exp $
*/
#include "mech_locl.h"
#include <heim_threads.h>
#ifndef _PATH_GSS_MECH
#define _PATH_GSS_MECH "/etc/gss/mech"
#endif
struct _gss_mech_switch_list _gss_mechs = { NULL } ;
gss_OID_set _gss_mech_oids;
static HEIMDAL_MUTEX _gss_mech_mutex = HEIMDAL_MUTEX_INITIALIZER;
/*
* Convert a string containing an OID in 'dot' form
* (e.g. 1.2.840.113554.1.2.2) to a gss_OID.
*/
static int
_gss_string_to_oid(const char* s, gss_OID oid)
{
int number_count, i, j;
size_t byte_count;
const char *p, *q;
char *res;
oid->length = 0;
oid->elements = NULL;
/*
* First figure out how many numbers in the oid, then
* calculate the compiled oid size.
*/
number_count = 0;
for (p = s; p; p = q) {
q = strchr(p, '.');
if (q) q = q + 1;
number_count++;
}
/*
* The first two numbers are in the first byte and each
* subsequent number is encoded in a variable byte sequence.
*/
if (number_count < 2)
return (EINVAL);
/*
* We do this in two passes. The first pass, we just figure
* out the size. Second time around, we actually encode the
* number.
*/
res = 0;
for (i = 0; i < 2; i++) {
byte_count = 0;
for (p = s, j = 0; p; p = q, j++) {
unsigned int number = 0;
/*
* Find the end of this number.
*/
q = strchr(p, '.');
if (q) q = q + 1;
/*
* Read the number of of the string. Don't
* bother with anything except base ten.
*/
while (*p && *p != '.') {
number = 10 * number + (*p - '0');
p++;
}
/*
* Encode the number. The first two numbers
* are packed into the first byte. Subsequent
* numbers are encoded in bytes seven bits at
* a time with the last byte having the high
* bit set.
*/
if (j == 0) {
if (res)
*res = number * 40;
} else if (j == 1) {
if (res) {
*res += number;
res++;
}
byte_count++;
} else if (j >= 2) {
/*
* The number is encoded in seven bit chunks.
*/
unsigned int t;
unsigned int bytes;
bytes = 0;
for (t = number; t; t >>= 7)
bytes++;
if (bytes == 0) bytes = 1;
while (bytes) {
if (res) {
int bit = 7*(bytes-1);
*res = (number >> bit) & 0x7f;
if (bytes != 1)
*res |= 0x80;
res++;
}
byte_count++;
bytes--;
}
}
}
if (!res) {
res = malloc(byte_count);
if (!res)
return (ENOMEM);
oid->length = byte_count;
oid->elements = res;
}
}
return (0);
}
#define SYM(name) \
do { \
m->gm_mech.gm_ ## name = dlsym(so, "gss_" #name); \
if (!m->gm_mech.gm_ ## name || \
m->gm_mech.gm_ ##name == gss_ ## name) { \
fprintf(stderr, "can't find symbol gss_" #name "\n"); \
goto bad; \
} \
} while (0)
#define OPTSYM(name) \
do { \
m->gm_mech.gm_ ## name = dlsym(so, "gss_" #name); \
if (m->gm_mech.gm_ ## name == gss_ ## name) \
m->gm_mech.gm_ ## name = NULL; \
} while (0)
#define OPTSPISYM(name) \
do { \
m->gm_mech.gm_ ## name = dlsym(so, "gssspi_" #name); \
} while (0)
#define COMPATSYM(name) \
do { \
m->gm_mech.gm_compat->gmc_ ## name = dlsym(so, "gss_" #name); \
if (m->gm_mech.gm_compat->gmc_ ## name == gss_ ## name) \
m->gm_mech.gm_compat->gmc_ ## name = NULL; \
} while (0)
#define COMPATSPISYM(name) \
do { \
m->gm_mech.gm_compat->gmc_ ## name = dlsym(so, "gssspi_" #name);\
if (m->gm_mech.gm_compat->gmc_ ## name == gss_ ## name) \
m->gm_mech.gm_compat->gmc_ ## name = NULL; \
} while (0)
/*
*
*/
static int
add_builtin(gssapi_mech_interface mech)
{
struct _gss_mech_switch *m;
OM_uint32 minor_status;
/* not registering any mech is ok */
if (mech == NULL)
return 0;
m = calloc(1, sizeof(*m));
if (m == NULL)
return ENOMEM;
m->gm_so = NULL;
m->gm_mech = *mech;
m->gm_mech_oid = mech->gm_mech_oid; /* XXX */
gss_add_oid_set_member(&minor_status,
&m->gm_mech.gm_mech_oid, &_gss_mech_oids);
/* pick up the oid sets of names */
if (m->gm_mech.gm_inquire_names_for_mech)
(*m->gm_mech.gm_inquire_names_for_mech)(&minor_status,
&m->gm_mech.gm_mech_oid, &m->gm_name_types);
if (m->gm_name_types == NULL)
gss_create_empty_oid_set(&minor_status, &m->gm_name_types);
HEIM_SLIST_INSERT_HEAD(&_gss_mechs, m, gm_link);
return 0;
}
/*
* Load the mechanisms file (/etc/gss/mech).
*/
void
_gss_load_mech(void)
{
OM_uint32 major_status, minor_status;
FILE *fp;
char buf[256];
char *p;
char *name, *oid, *lib, *kobj;
struct _gss_mech_switch *m;
void *so;
gss_OID_desc mech_oid;
int found;
HEIMDAL_MUTEX_lock(&_gss_mech_mutex);
if (HEIM_SLIST_FIRST(&_gss_mechs)) {
HEIMDAL_MUTEX_unlock(&_gss_mech_mutex);
return;
}
major_status = gss_create_empty_oid_set(&minor_status,
&_gss_mech_oids);
if (major_status) {
HEIMDAL_MUTEX_unlock(&_gss_mech_mutex);
return;
}
add_builtin(__gss_krb5_initialize());
add_builtin(__gss_spnego_initialize());
add_builtin(__gss_ntlm_initialize());
#ifdef HAVE_DLOPEN
fp = fopen(_PATH_GSS_MECH, "r");
if (!fp) {
HEIMDAL_MUTEX_unlock(&_gss_mech_mutex);
return;
}
rk_cloexec_file(fp);
while (fgets(buf, sizeof(buf), fp)) {
_gss_mo_init *mi;
if (*buf == '#')
continue;
p = buf;
name = strsep(&p, "\t\n ");
if (p) while (isspace((unsigned char)*p)) p++;
oid = strsep(&p, "\t\n ");
if (p) while (isspace((unsigned char)*p)) p++;
lib = strsep(&p, "\t\n ");
if (p) while (isspace((unsigned char)*p)) p++;
kobj = strsep(&p, "\t\n ");
if (!name || !oid || !lib || !kobj)
continue;
if (_gss_string_to_oid(oid, &mech_oid))
continue;
/*
* Check for duplicates, already loaded mechs.
*/
found = 0;
HEIM_SLIST_FOREACH(m, &_gss_mechs, gm_link) {
if (gss_oid_equal(&m->gm_mech.gm_mech_oid, &mech_oid)) {
found = 1;
free(mech_oid.elements);
break;
}
}
if (found)
continue;
#ifndef RTLD_LOCAL
#define RTLD_LOCAL 0
#endif
#ifndef RTLD_GROUP
#define RTLD_GROUP 0
#endif
so = dlopen(lib, RTLD_LAZY | RTLD_LOCAL | RTLD_GROUP);
if (so == NULL) {
/* fprintf(stderr, "dlopen: %s\n", dlerror()); */
goto bad;
}
m = calloc(1, sizeof(*m));
if (m == NULL)
goto bad;
m->gm_so = so;
m->gm_mech.gm_mech_oid = mech_oid;
m->gm_mech.gm_flags = 0;
m->gm_mech.gm_compat = calloc(1, sizeof(struct gss_mech_compat_desc_struct));
if (m->gm_mech.gm_compat == NULL)
goto bad;
major_status = gss_add_oid_set_member(&minor_status,
&m->gm_mech.gm_mech_oid, &_gss_mech_oids);
if (GSS_ERROR(major_status))
goto bad;
SYM(acquire_cred);
SYM(release_cred);
SYM(init_sec_context);
SYM(accept_sec_context);
SYM(process_context_token);
SYM(delete_sec_context);
SYM(context_time);
SYM(get_mic);
SYM(verify_mic);
SYM(wrap);
SYM(unwrap);
SYM(display_status);
SYM(indicate_mechs);
SYM(compare_name);
SYM(display_name);
SYM(import_name);
SYM(export_name);
SYM(release_name);
SYM(inquire_cred);
SYM(inquire_context);
SYM(wrap_size_limit);
SYM(add_cred);
SYM(inquire_cred_by_mech);
SYM(export_sec_context);
SYM(import_sec_context);
SYM(inquire_names_for_mech);
SYM(inquire_mechs_for_name);
SYM(canonicalize_name);
SYM(duplicate_name);
OPTSYM(inquire_cred_by_oid);
OPTSYM(inquire_sec_context_by_oid);
OPTSYM(set_sec_context_option);
OPTSPISYM(set_cred_option);
OPTSYM(pseudo_random);
OPTSYM(wrap_iov);
OPTSYM(unwrap_iov);
OPTSYM(wrap_iov_length);
OPTSYM(store_cred);
OPTSYM(export_cred);
OPTSYM(import_cred);
#if 0
OPTSYM(acquire_cred_ext);
OPTSYM(iter_creds);
OPTSYM(destroy_cred);
OPTSYM(cred_hold);
OPTSYM(cred_unhold);
OPTSYM(cred_label_get);
OPTSYM(cred_label_set);
#endif
OPTSYM(display_name_ext);
OPTSYM(inquire_name);
OPTSYM(get_name_attribute);
OPTSYM(set_name_attribute);
OPTSYM(delete_name_attribute);
OPTSYM(export_name_composite);
OPTSYM(pname_to_uid);
OPTSPISYM(authorize_localname);
mi = dlsym(so, "gss_mo_init");
if (mi != NULL) {
major_status = mi(&minor_status, &mech_oid,
&m->gm_mech.gm_mo, &m->gm_mech.gm_mo_num);
if (GSS_ERROR(major_status))
goto bad;
} else {
/* API-as-SPI compatibility */
COMPATSYM(inquire_saslname_for_mech);
COMPATSYM(inquire_mech_for_saslname);
COMPATSYM(inquire_attrs_for_mech);
COMPATSPISYM(acquire_cred_with_password);
}
/* pick up the oid sets of names */
if (m->gm_mech.gm_inquire_names_for_mech)
(*m->gm_mech.gm_inquire_names_for_mech)(&minor_status,
&m->gm_mech.gm_mech_oid, &m->gm_name_types);
if (m->gm_name_types == NULL)
gss_create_empty_oid_set(&minor_status, &m->gm_name_types);
HEIM_SLIST_INSERT_HEAD(&_gss_mechs, m, gm_link);
continue;
bad:
if (m != NULL) {
free(m->gm_mech.gm_compat);
free(m->gm_mech.gm_mech_oid.elements);
free(m);
}
dlclose(so);
continue;
}
fclose(fp);
#endif
HEIMDAL_MUTEX_unlock(&_gss_mech_mutex);
}
gssapi_mech_interface
__gss_get_mechanism(gss_const_OID mech)
{
struct _gss_mech_switch *m;
_gss_load_mech();
HEIM_SLIST_FOREACH(m, &_gss_mechs, gm_link) {
if (gss_oid_equal(&m->gm_mech.gm_mech_oid, mech))
return &m->gm_mech;
}
return NULL;
}