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|
/*
* lib/krb5/ccache/cc_keyring.c
*
* Copyright (c) 2006
* The Regents of the University of Michigan
* ALL RIGHTS RESERVED
*
* Permission is granted to use, copy, create derivative works
* and redistribute this software and such derivative works
* for any purpose, so long as the name of The University of
* Michigan is not used in any advertising or publicity
* pertaining to the use of distribution of this software
* without specific, written prior authorization. If the
* above copyright notice or any other identification of the
* University of Michigan is included in any copy of any
* portion of this software, then the disclaimer below must
* also be included.
*
* THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION
* FROM THE UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY
* PURPOSE, AND WITHOUT WARRANTY BY THE UNIVERSITY OF
* MICHIGAN OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING
* WITHOUT LIMITATION THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
* REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE LIABLE
* FOR ANY DAMAGES, INCLUDING SPECIAL, INDIRECT, INCIDENTAL, OR
* CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM ARISING
* OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
* IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGES.
*
*/
/*
* Copyright 1990,1991,1992,1993,1994,2000,2004 Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Original stdio support copyright 1995 by Cygnus Support.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
/*
* Implementation of a credentials cache stored in the Linux keyring facility
*
* Some assumptions:
*
* - A credentials cache "file" == a keyring with separate keys
* for the information in the ccache (see below)
* - A credentials cache keyring will contain only keys,
* not other keyrings
* - Each Kerberos ticket will have its own key within the ccache keyring
* - The principal information for the ccache is stored in a
* special key, which is not counted in the 'numkeys' count
*/
#include "k5-int.h"
#ifdef USE_KEYRING_CCACHE
#include <errno.h>
#include <keyutils.h>
#ifdef DEBUG
#define KRCC_DEBUG 1
#endif
#if KRCC_DEBUG
void debug_print(char *fmt, ...); /* prototype to silence warning */
#include <syslog.h>
#define DEBUG_PRINT(x) debug_print x
void
debug_print(char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
#ifdef DEBUG_STDERR
vfprintf(stderr, fmt, ap);
#else
vsyslog(LOG_ERR, fmt, ap);
#endif
va_end(ap);
}
#else
#define DEBUG_PRINT(x)
#endif
/*
* We always use "user" key type
*/
#define KRCC_KEY_TYPE_USER "user"
/*
* We create ccaches as separate keyrings
*/
#define KRCC_KEY_TYPE_KEYRING "keyring"
/*
* Special name of the key within a ccache keyring
* holding principal information
*/
#define KRCC_SPEC_PRINC_KEYNAME "__krb5_princ__"
/*
* XXX The following two really belong in some external
* header since outside programs will need to use these
* same names.
*/
/*
* Special name for key to communicate key serial numbers
* This is used by the Linux gssd process to pass the
* user's keyring values it gets in an upcall.
* The format of the contents should be
* <session_key>:<process_key>:<thread_key>
*/
#define KRCC_SPEC_IDS_KEYNAME "_gssd_keyring_ids_"
/*
* Special name for the key to communicate the name(s)
* of credentials caches to be used for requests.
* This should currently contain a single name, but
* in the future may contain a list that may be
* intelligently chosen from.
*/
#define KRCC_SPEC_CCACHE_SET_KEYNAME "__krb5_cc_set__"
#define KRB5_OK 0
/* Hopefully big enough to hold a serialized credential */
#define GUESS_CRED_SIZE 4096
#define ALLOC(NUM,TYPE) \
(((NUM) <= (((size_t)0-1)/ sizeof(TYPE))) \
? (TYPE *) calloc((NUM), sizeof(TYPE)) \
: (errno = ENOMEM,(TYPE *) 0))
#define CHECK_N_GO(ret, errdest) if (ret != KRB5_OK) goto errdest
#define CHECK(ret) if (ret != KRB5_OK) goto errout
#define CHECK_OUT(ret) if (ret != KRB5_OK) return ret
typedef struct krb5_krcc_ring_ids {
key_serial_t session;
key_serial_t process;
key_serial_t thread;
} krb5_krcc_ring_ids_t;
typedef struct _krb5_krcc_cursor
{
int numkeys;
int currkey;
key_serial_t princ_id;
key_serial_t *keys;
} *krb5_krcc_cursor;
/*
* This represents a credentials cache "file"
* where ring_id is the keyring serial number for
* this credentials cache "file". Each key
* in the keyring contains a separate key.
*/
typedef struct _krb5_krcc_data
{
char *name; /* Name for this credentials cache */
k5_mutex_t lock; /* synchronization */
key_serial_t parent_id; /* parent keyring of this ccache keyring */
key_serial_t ring_id; /* keyring representing ccache */
key_serial_t princ_id; /* key holding principal info */
int numkeys; /* # of keys in this ring
* (does NOT include principal info) */
} krb5_krcc_data;
/* Passed internally to assure we don't go past the bounds of our buffer */
typedef struct _krb5_krcc_buffer_cursor
{
char *bpp;
char *endp;
} krb5_krcc_bc;
/* Global mutex */
k5_mutex_t krb5int_krcc_mutex = K5_MUTEX_PARTIAL_INITIALIZER;
/*
* Internal functions (exported via the krb5_krcc_ops)
*/
extern const krb5_cc_ops krb5_krcc_ops;
static const char *KRB5_CALLCONV krb5_krcc_get_name
(krb5_context, krb5_ccache id);
static krb5_error_code KRB5_CALLCONV krb5_krcc_resolve
(krb5_context, krb5_ccache * id, const char *residual);
static krb5_error_code KRB5_CALLCONV krb5_krcc_generate_new
(krb5_context, krb5_ccache * id);
static krb5_error_code KRB5_CALLCONV krb5_krcc_initialize
(krb5_context, krb5_ccache id, krb5_principal princ);
static krb5_error_code KRB5_CALLCONV krb5_krcc_destroy
(krb5_context, krb5_ccache id);
static krb5_error_code KRB5_CALLCONV krb5_krcc_close
(krb5_context, krb5_ccache id);
static krb5_error_code KRB5_CALLCONV krb5_krcc_store
(krb5_context, krb5_ccache id, krb5_creds * creds);
static krb5_error_code KRB5_CALLCONV krb5_krcc_retrieve
(krb5_context, krb5_ccache id, krb5_flags whichfields,
krb5_creds * mcreds, krb5_creds * creds);
static krb5_error_code KRB5_CALLCONV krb5_krcc_get_principal
(krb5_context, krb5_ccache id, krb5_principal * princ);
static krb5_error_code KRB5_CALLCONV krb5_krcc_start_seq_get
(krb5_context, krb5_ccache id, krb5_cc_cursor * cursor);
static krb5_error_code KRB5_CALLCONV krb5_krcc_next_cred
(krb5_context, krb5_ccache id, krb5_cc_cursor * cursor,
krb5_creds * creds);
static krb5_error_code KRB5_CALLCONV krb5_krcc_end_seq_get
(krb5_context, krb5_ccache id, krb5_cc_cursor * cursor);
static krb5_error_code KRB5_CALLCONV krb5_krcc_remove_cred
(krb5_context context, krb5_ccache cache, krb5_flags flags,
krb5_creds * creds);
static krb5_error_code KRB5_CALLCONV krb5_krcc_set_flags
(krb5_context, krb5_ccache id, krb5_flags flags);
static krb5_error_code KRB5_CALLCONV krb5_krcc_get_flags
(krb5_context context, krb5_ccache id, krb5_flags * flags);
/*
* Internal utility functions
*/
static krb5_error_code krb5_krcc_clearcache
(krb5_context context, krb5_ccache id);
static krb5_error_code krb5_krcc_new_data
(const char *, key_serial_t ring, key_serial_t parent_ring,
krb5_krcc_data **);
static krb5_error_code krb5_krcc_save_principal
(krb5_context context, krb5_ccache id, krb5_principal princ);
static krb5_error_code krb5_krcc_retrieve_principal
(krb5_context context, krb5_ccache id, krb5_principal * princ);
static int krb5_krcc_get_ring_ids(krb5_krcc_ring_ids_t *p);
/* Routines to parse a key from a keyring into a cred structure */
static krb5_error_code krb5_krcc_parse
(krb5_context, krb5_ccache id, krb5_pointer buf, unsigned int len,
krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_parse_cred
(krb5_context context, krb5_ccache id, krb5_creds * creds,
char *payload, int psize);
static krb5_error_code krb5_krcc_parse_principal
(krb5_context context, krb5_ccache id, krb5_principal * princ,
krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_parse_keyblock
(krb5_context context, krb5_ccache id, krb5_keyblock * keyblock,
krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_parse_times
(krb5_context context, krb5_ccache id, krb5_ticket_times * t,
krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_parse_krb5data
(krb5_context context, krb5_ccache id, krb5_data * data,
krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_parse_int32
(krb5_context context, krb5_ccache id, krb5_int32 * i, krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_parse_octet
(krb5_context context, krb5_ccache id, krb5_octet * octet,
krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_parse_addrs
(krb5_context context, krb5_ccache id, krb5_address *** a,
krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_parse_addr
(krb5_context context, krb5_ccache id, krb5_address * a,
krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_parse_authdata
(krb5_context context, krb5_ccache id, krb5_authdata *** ad,
krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_parse_authdatum
(krb5_context context, krb5_ccache id, krb5_authdata * ad,
krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_parse_ui_2
(krb5_context, krb5_ccache id, krb5_ui_2 * i, krb5_krcc_bc * bc);
/* Routines to unparse a cred structure into keyring key */
static krb5_error_code krb5_krcc_unparse
(krb5_context, krb5_ccache id, krb5_pointer buf, unsigned int len,
krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_unparse_cred
(krb5_context context, krb5_ccache id, krb5_creds * creds,
char **datapp, unsigned int *lenptr);
static krb5_error_code krb5_krcc_unparse_principal
(krb5_context, krb5_ccache id, krb5_principal princ, krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_unparse_keyblock
(krb5_context, krb5_ccache id, krb5_keyblock * keyblock,
krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_unparse_times
(krb5_context, krb5_ccache id, krb5_ticket_times * t, krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_unparse_krb5data
(krb5_context, krb5_ccache id, krb5_data * data, krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_unparse_int32
(krb5_context, krb5_ccache id, krb5_int32 i, krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_unparse_octet
(krb5_context, krb5_ccache id, krb5_int32 i, krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_unparse_addrs
(krb5_context, krb5_ccache, krb5_address ** a, krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_unparse_addr
(krb5_context, krb5_ccache, krb5_address * a, krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_unparse_authdata
(krb5_context, krb5_ccache, krb5_authdata ** ad, krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_unparse_authdatum
(krb5_context, krb5_ccache, krb5_authdata * ad, krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_unparse_ui_4
(krb5_context, krb5_ccache id, krb5_ui_4 i, krb5_krcc_bc * bc);
static krb5_error_code krb5_krcc_unparse_ui_2
(krb5_context, krb5_ccache id, krb5_int32 i, krb5_krcc_bc * bc);
/* Note the following is a stub function for Linux */
extern krb5_error_code krb5_change_cache(void);
/*
* Modifies:
* id
*
* Effects:
* Creates/refreshes the cred cache id. If the cache exists, its
* contents are destroyed.
*
* Errors:
* system errors
* permission errors
*/
static krb5_error_code KRB5_CALLCONV
krb5_krcc_initialize(krb5_context context, krb5_ccache id,
krb5_principal princ)
{
krb5_error_code kret;
DEBUG_PRINT(("krb5_krcc_initialize: entered\n"));
kret = k5_mutex_lock(&((krb5_krcc_data *) id->data)->lock);
if (kret)
return kret;
kret = krb5_krcc_clearcache(context, id);
if (kret != KRB5_OK)
goto out;
kret = krb5_krcc_save_principal(context, id, princ);
if (kret == KRB5_OK)
krb5_change_cache();
out:
k5_mutex_unlock(&((krb5_krcc_data *) id->data)->lock);
return kret;
}
/*
* Modifies:
* id
*
* Effects:
* Invalidates the id, and frees any resources associated with the cache.
* (Does NOT destroy the underlying ccache in the keyring.)
*/
static krb5_error_code KRB5_CALLCONV
krb5_krcc_close(krb5_context context, krb5_ccache id)
{
krb5_krcc_data *d;
DEBUG_PRINT(("krb5_krcc_close: entered\n"));
d = (krb5_krcc_data *) id->data;
krb5_xfree(d->name);
k5_mutex_destroy(&d->lock);
krb5_xfree(d);
krb5_xfree(id);
return KRB5_OK;
}
/*
* Modifies:
* id
*
* Effects:
* Clears out a ccache keyring, unlinking all keys within it
* (Including the "hidden" key with the principal information)
*
* Requires:
* Must be called with mutex locked.
*
* Errors:
* system errors
*/
static krb5_error_code
krb5_krcc_clearcache(krb5_context context, krb5_ccache id)
{
krb5_krcc_data *d;
key_serial_t *keys;
unsigned int size;
int res;
int i;
k5_assert_locked(&((krb5_krcc_data *) id->data)->lock);
d = (krb5_krcc_data *) id->data;
DEBUG_PRINT(("krb5_krcc_clearcache: ring_id %d, princ_id %d, "
"numkeys is %d\n", d->ring_id, d->princ_id, d->numkeys));
if (d->numkeys > 0) {
size = (d->numkeys + 1) * sizeof(key_serial_t); /* +1 for princ key */
keys = malloc(size);
reread:
if (!keys)
return KRB5_CC_NOMEM;
res = keyctl_read(d->ring_id, (char *) keys, size);
if (res < 0) {
free(keys);
return errno;
}
if (res != size) { /* are there more keys than we thought? */
DEBUG_PRINT(("krb5_krcc_clearcache: numkeys %d, res %d, "
"size %d reallocing key array\n",
d->numkeys, res, size));
size = res;
keys = realloc(keys, (unsigned int) res);
goto reread;
}
for (i = 0; i < (size / sizeof(key_serial_t)); i++) {
res = keyctl_unlink(keys[i], d->ring_id);
if (res < 0) {
com_err("krb5_krcc_clearcache", errno,
"unlinking key[%d] %d", i, keys[i]);
DEBUG_PRINT(("krb5_krcc_clearcache: error unlinking "
"key %d, res == %d\n", keys[i], res));
}
}
free(keys);
d->numkeys = 0;
d->princ_id = 0;
}
return KRB5_OK;
}
/*
* Effects:
* Destroys the contents of id.
*
* Errors:
* system errors
*/
static krb5_error_code KRB5_CALLCONV
krb5_krcc_destroy(krb5_context context, krb5_ccache id)
{
krb5_error_code kret;
krb5_krcc_data *d;
int res;
DEBUG_PRINT(("krb5_krcc_destroy: entered\n"));
d = (krb5_krcc_data *) id->data;
kret = k5_mutex_lock(&d->lock);
if (kret)
return kret;
krb5_krcc_clearcache(context, id);
krb5_xfree(d->name);
res = keyctl_unlink(d->ring_id, d->parent_id);
if (res < 0) {
kret = errno;
com_err("krb5_krcc_destroy", errno, "unlinking key %d from ring %d",
d->ring_id, d->parent_id);
goto cleanup;
}
cleanup:
k5_mutex_unlock(&d->lock);
k5_mutex_destroy(&d->lock);
krb5_xfree(d);
krb5_xfree(id);
krb5_change_cache();
return KRB5_OK;
}
/*
* Requires:
* residual is a legal path name, and a null-terminated string
*
* Modifies:
* id
*
* Effects:
* creates a cred cache that will reside in the keyring with
* a name of <residual>.
*
* Returns:
* A filled in krb5_ccache structure "id".
*
* Errors:
* KRB5_CC_NOMEM - there was insufficient memory to allocate the
* krb5_ccache. id is undefined.
* permission errors
*/
static krb5_error_code KRB5_CALLCONV
krb5_krcc_resolve(krb5_context context, krb5_ccache * id, const char *full_residual)
{
krb5_ccache lid;
krb5_error_code kret;
krb5_krcc_data *d;
key_serial_t key;
key_serial_t pkey = 0;
int nkeys = 0;
int res;
krb5_krcc_ring_ids_t ids;
key_serial_t ring_id;
const char *residual;
DEBUG_PRINT(("krb5_krcc_resolve: entered with name '%s'\n",
full_residual));
res = krb5_krcc_get_ring_ids(&ids);
if (res) {
kret = EINVAL;
DEBUG_PRINT(("krb5_krcc_resolve: Error getting ring id values!\n"));
return kret;
}
if (strncmp(full_residual, "thread:", 7) == 0) {
residual = full_residual + 7;
ring_id = ids.thread;
} else if (strncmp(full_residual, "process:", 8) == 0) {
residual = full_residual + 8;
ring_id = ids.process;
} else {
residual = full_residual;
ring_id = ids.session;
}
DEBUG_PRINT(("krb5_krcc_resolve: searching ring %d for residual '%s'\n",
ring_id, residual));
/*
* Use keyctl_search instead of request_key. If we're supposed
* to be looking for a process ccache, we shouldn't find a
* thread ccache.
* XXX But should we look in the session ring if we don't find it
* in the process ring? Same goes for thread. Should we look in
* the process and session rings if not found in the thread ring?
*
*/
key = keyctl_search(ring_id, KRCC_KEY_TYPE_KEYRING, residual, 0);
if (key < 0) {
key = add_key(KRCC_KEY_TYPE_KEYRING, residual, NULL, 0, ring_id);
if (key < 0) {
kret = errno;
DEBUG_PRINT(("krb5_krcc_resolve: Error adding new "
"keyring '%s': %s\n", residual, strerror(errno)));
return kret;
}
DEBUG_PRINT(("krb5_krcc_resolve: new keyring '%s', "
"key %d, added to keyring %d\n",
residual, key, ring_id));
} else {
DEBUG_PRINT(("krb5_krcc_resolve: found existing "
"key %d, with name '%s' in keyring %d\n",
key, residual, ring_id));
/* Determine key containing principal information */
pkey = keyctl_search(key, KRCC_KEY_TYPE_USER,
KRCC_SPEC_PRINC_KEYNAME, 0);
if (pkey < 0) {
DEBUG_PRINT(("krb5_krcc_resolve: Error locating principal "
"info for existing ccache in ring %d: %s\n",
key, strerror(errno)));
pkey = 0;
}
/* Determine how many keys exist */
res = keyctl_read(key, NULL, 0);
if (res > 0)
nkeys = (res / sizeof(key_serial_t)) - 1;
else
nkeys = 0;
}
lid = (krb5_ccache) malloc(sizeof(struct _krb5_ccache));
if (lid == NULL)
return KRB5_CC_NOMEM;
kret = krb5_krcc_new_data(residual, key, ring_id, &d);
if (kret) {
free(lid);
return kret;
}
DEBUG_PRINT(("krb5_krcc_resolve: ring_id %d, princ_id %d, "
"nkeys %d\n", key, pkey, nkeys));
d->princ_id = pkey;
d->numkeys = nkeys;
lid->ops = &krb5_krcc_ops;
lid->data = d;
lid->magic = KV5M_CCACHE;
*id = lid;
return KRB5_OK;
}
/*
* Effects:
* Prepares for a sequential search of the credentials cache.
* Returns a krb5_cc_cursor to be used with krb5_krcc_next_cred and
* krb5_krcc_end_seq_get.
*
* If the cache is modified between the time of this call and the time
* of the final krb5_krcc_end_seq_get, the results are undefined.
*
* Errors:
* KRB5_CC_NOMEM
* system errors
*/
static krb5_error_code KRB5_CALLCONV
krb5_krcc_start_seq_get(krb5_context context, krb5_ccache id,
krb5_cc_cursor * cursor)
{
krb5_krcc_cursor krcursor;
krb5_error_code kret;
krb5_krcc_data *d;
unsigned int size;
int res;
DEBUG_PRINT(("krb5_krcc_start_seq_get: entered\n"));
d = id->data;
kret = k5_mutex_lock(&d->lock);
if (kret)
return kret;
size = sizeof(*krcursor) + ((d->numkeys + 1) * sizeof(key_serial_t));
krcursor = (krb5_krcc_cursor) malloc(size);
if (krcursor == NULL) {
k5_mutex_unlock(&d->lock);
return KRB5_CC_NOMEM;
}
krcursor->keys = (key_serial_t *) ((char *) krcursor + sizeof(*krcursor));
res = keyctl_read(d->ring_id, (char *) krcursor->keys,
((d->numkeys + 1) * sizeof(key_serial_t)));
if (res < 0 || res > ((d->numkeys + 1) * sizeof(key_serial_t))) {
DEBUG_PRINT(("Read %d bytes from keyring, numkeys %d: %s\n",
res, d->numkeys, strerror(errno)));
free(krcursor);
k5_mutex_unlock(&d->lock);
return KRB5_CC_IO;
}
krcursor->numkeys = d->numkeys;
krcursor->currkey = 0;
krcursor->princ_id = d->princ_id;
k5_mutex_unlock(&d->lock);
*cursor = (krb5_cc_cursor) krcursor;
return KRB5_OK;
}
/*
* Requires:
* cursor is a krb5_cc_cursor originally obtained from
* krb5_krcc_start_seq_get.
*
* Modifes:
* cursor, creds
*
* Effects:
* Fills in creds with the "next" credentals structure from the cache
* id. The actual order the creds are returned in is arbitrary.
* Space is allocated for the variable length fields in the
* credentials structure, so the object returned must be passed to
* krb5_destroy_credential.
*
* The cursor is updated for the next call to krb5_krcc_next_cred.
*
* Errors:
* system errors
*/
static krb5_error_code KRB5_CALLCONV
krb5_krcc_next_cred(krb5_context context, krb5_ccache id,
krb5_cc_cursor * cursor, krb5_creds * creds)
{
krb5_krcc_cursor krcursor;
krb5_error_code kret;
int psize;
void *payload;
DEBUG_PRINT(("krb5_krcc_next_cred: entered\n"));
/*
* Once the node in the linked list is created, it's never
* modified, so we don't need to worry about locking here.
* (Note that we don't support _remove_cred.)
*/
krcursor = (krb5_krcc_cursor) * cursor;
if (krcursor == NULL)
return KRB5_CC_END;
memset(creds, 0, sizeof(krb5_creds));
/* If we're pointing at the entry with the principal, skip it */
if (krcursor->keys[krcursor->currkey] == krcursor->princ_id)
krcursor->currkey++;
/* If we're pointing past the end of the keys array, there are no more */
if (krcursor->currkey > krcursor->numkeys)
return KRB5_CC_END;
/* Read the key, the right size buffer will ba allocated and returned */
psize = keyctl_read_alloc(krcursor->keys[krcursor->currkey], &payload);
if (psize == -1) {
DEBUG_PRINT(("Error reading key %d: %s\n",
krcursor->keys[krcursor->currkey],
strerror(errno)));
kret = KRB5_CC_IO;
goto freepayload;
}
krcursor->currkey++;
kret = krb5_krcc_parse_cred(context, id, creds, payload, psize);
freepayload:
free(payload);
return kret;
}
/*
* Requires:
* cursor is a krb5_cc_cursor originally obtained from
* krb5_krcc_start_seq_get.
*
* Modifies:
* id, cursor
*
* Effects:
* Finishes sequential processing of the keyring credentials ccache id,
* and invalidates the cursor (it must never be used after this call).
*/
/* ARGSUSED */
static krb5_error_code KRB5_CALLCONV
krb5_krcc_end_seq_get(krb5_context context, krb5_ccache id,
krb5_cc_cursor * cursor)
{
DEBUG_PRINT(("krb5_krcc_end_seq_get: entered\n"));
free(*cursor);
*cursor = 0L;
return KRB5_OK;
}
/* Utility routine: Creates the back-end data for a keyring cache.
Call with the global list lock held. */
static krb5_error_code
krb5_krcc_new_data(const char *name, key_serial_t ring,
key_serial_t parent_ring, krb5_krcc_data ** datapp)
{
krb5_error_code kret;
krb5_krcc_data *d;
d = malloc(sizeof(krb5_krcc_data));
if (d == NULL)
return KRB5_CC_NOMEM;
kret = k5_mutex_init(&d->lock);
if (kret) {
krb5_xfree(d);
return kret;
}
d->name = strdup(name);
if (d->name == NULL) {
k5_mutex_destroy(&d->lock);
krb5_xfree(d);
return KRB5_CC_NOMEM;
}
d->princ_id = 0;
d->ring_id = ring;
d->parent_id = parent_ring;
d->numkeys = 0;
*datapp = d;
return 0;
}
/* Utility routine: Creates a random memory ccache name.
* This algorithm was selected because it creates readable
* random ccache names in a fixed size buffer. */
static krb5_error_code
random_string (krb5_context context, char *string, krb5_int32 length)
{
static const unsigned char charlist[] =
"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
krb5_error_code err = 0;
unsigned char *bytes = NULL;
size_t bytecount = length - 1;
if (!err) {
bytes = malloc (bytecount);
if (bytes == NULL) { err = ENOMEM; }
}
if (!err) {
krb5_data data;
data.length = bytecount;
data.data = (char *) bytes;
err = krb5_c_random_make_octets (context, &data);
}
if (!err) {
krb5_int32 i;
for (i = 0; i < bytecount; i++) {
string [i] = charlist[bytes[i] % (sizeof (charlist) - 1)];
}
string[length - 1] = '\0';
}
if (bytes != NULL) { free (bytes); }
return err;
}
/*
* Effects:
* Creates a new keyring cred cache whose name is guaranteed to be
* unique.
*
* Returns:
* The filled in krb5_ccache id.
*
* Errors:
* KRB5_CC_NOMEM - there was insufficient memory to allocate the
* krb5_ccache. id is undefined.
*/
static krb5_error_code KRB5_CALLCONV
krb5_krcc_generate_new(krb5_context context, krb5_ccache * id)
{
krb5_ccache lid;
char uniquename[8];
krb5_error_code kret;
krb5_krcc_data *d;
key_serial_t ring_id = KEY_SPEC_SESSION_KEYRING;
key_serial_t key;
DEBUG_PRINT(("krb5_krcc_generate_new: entered\n"));
/* Allocate memory */
lid = (krb5_ccache) malloc(sizeof(struct _krb5_ccache));
if (lid == NULL)
return KRB5_CC_NOMEM;
lid->ops = &krb5_krcc_ops;
kret = k5_mutex_lock(&krb5int_krcc_mutex);
if (kret) {
free(lid);
return kret;
}
/* XXX These values are platform-specific and should not be here! */
/* XXX There is a bug in FC5 where these are not included in errno.h */
#ifndef ENOKEY
#define ENOKEY 126 /* Required key not available */
#endif
#ifndef EKEYEXPIRED
#define EKEYEXPIRED 127 /* Key has expired */
#endif
#ifndef EKEYREVOKED
#define EKEYREVOKED 128 /* Key has been revoked */
#endif
#ifndef EKEYREJECTED
#define EKEYREJECTED 129 /* Key was rejected by service */
#endif
/*
* Loop until we successfully create a new ccache keyring with
* a unique name, or we get an error.
*/
while (1) {
random_string(context, uniquename, sizeof(uniquename));
DEBUG_PRINT(("krb5_krcc_generate_new: searching for name '%s'\n",
uniquename));
key = keyctl_search(ring_id, KRCC_KEY_TYPE_KEYRING, uniquename, 0);
/*XXX*/ DEBUG_PRINT(("krb5_krcc_generate_new: after searching for '%s', key = %d, errno = %d\n", uniquename, key, errno));
if (key < 0 && errno == ENOKEY) {
/* name does not already exist, create it to reserve the name */
key = add_key(KRCC_KEY_TYPE_KEYRING, uniquename, NULL, 0, ring_id);
if (key < 0) {
kret = errno;
DEBUG_PRINT(("krb5_krcc_generate_new: '%s' trying to "
"create '%s'\n", strerror(errno), uniquename));
k5_mutex_unlock(&krb5int_krcc_mutex);
return kret;
}
break;
}
}
kret = krb5_krcc_new_data(uniquename, key, ring_id, &d);
k5_mutex_unlock(&krb5int_krcc_mutex);
if (kret) {
krb5_xfree(lid);
return kret;
}
lid->data = d;
*id = lid;
krb5_change_cache();
return KRB5_OK;
}
/*
* Requires:
* id is a keyring credential cache
*
* Returns:
* The name of the keyring cred cache id.
*/
static const char *KRB5_CALLCONV
krb5_krcc_get_name(krb5_context context, krb5_ccache id)
{
DEBUG_PRINT(("krb5_krcc_get_name: entered\n"));
return (char *) ((krb5_krcc_data *) id->data)->name;
}
/*
* Modifies:
* id, princ
*
* Effects:
* Retrieves the primary principal from id, as set with
* krb5_krcc_initialize. The principal is returned is allocated
* storage that must be freed by the caller via krb5_free_principal.
*
* Errors:
* system errors
* KRB5_CC_NOMEM
*/
static krb5_error_code KRB5_CALLCONV
krb5_krcc_get_principal(krb5_context context, krb5_ccache id,
krb5_principal * princ)
{
DEBUG_PRINT(("krb5_krcc_get_principal: entered\n"));
return krb5_krcc_retrieve_principal(context, id, princ);
}
static krb5_error_code KRB5_CALLCONV
krb5_krcc_retrieve(krb5_context context, krb5_ccache id,
krb5_flags whichfields, krb5_creds * mcreds,
krb5_creds * creds)
{
DEBUG_PRINT(("krb5_krcc_retrieve: entered\n"));
return krb5_cc_retrieve_cred_default(context, id, whichfields,
mcreds, creds);
}
/*
* Non-functional stub implementation for krb5_krcc_remove
*
* Errors:
* KRB5_CC_NOSUPP - not implemented
*/
static krb5_error_code KRB5_CALLCONV
krb5_krcc_remove_cred(krb5_context context, krb5_ccache cache,
krb5_flags flags, krb5_creds * creds)
{
DEBUG_PRINT(("krb5_krcc_remove_cred: entered (returning KRB5_CC_NOSUPP)\n"));
return KRB5_CC_NOSUPP;
}
/*
* Requires:
* id is a cred cache returned by krb5_krcc_resolve or
* krb5_krcc_generate_new, but has not been opened by krb5_krcc_initialize.
*
* Modifies:
* id
*
* Effects:
* Sets the operational flags of id to flags.
*/
static krb5_error_code KRB5_CALLCONV
krb5_krcc_set_flags(krb5_context context, krb5_ccache id, krb5_flags flags)
{
DEBUG_PRINT(("krb5_krcc_set_flags: entered\n"));
return KRB5_OK;
}
static krb5_error_code KRB5_CALLCONV
krb5_krcc_get_flags(krb5_context context, krb5_ccache id, krb5_flags * flags)
{
DEBUG_PRINT(("krb5_krcc_get_flags: entered\n"));
*flags = 0;
return KRB5_OK;
}
/* store: Save away creds in the ccache keyring. */
static krb5_error_code KRB5_CALLCONV
krb5_krcc_store(krb5_context context, krb5_ccache id, krb5_creds * creds)
{
krb5_error_code kret;
krb5_krcc_data *d = (krb5_krcc_data *) id->data;
char *payload = NULL;
unsigned int payloadlen;
key_serial_t newkey;
char *keyname = NULL;
DEBUG_PRINT(("krb5_krcc_store: entered\n"));
kret = k5_mutex_lock(&d->lock);
if (kret)
return kret;
/* Get the service principal name and use it as the key name */
kret = krb5_unparse_name(context, creds->server, &keyname);
if (kret) {
DEBUG_PRINT(("Error unparsing service principal name!\n"));
goto errout;
}
/* Serialize credential into memory */
kret = krb5_krcc_unparse_cred(context, id, creds, &payload, &payloadlen);
if (kret != KRB5_OK)
goto errout;
/* Add new key (credentials) into keyring */
DEBUG_PRINT(("krb5_krcc_store: adding new key '%s' to keyring %d\n",
keyname, d->ring_id));
newkey = add_key(KRCC_KEY_TYPE_USER, keyname, payload,
payloadlen, d->ring_id);
if (newkey < 0) {
kret = errno;
DEBUG_PRINT(("Error adding user key '%s': %s\n",
keyname, strerror(kret)));
} else {
d->numkeys++;
kret = KRB5_OK;
}
errout:
if (keyname)
krb5_free_unparsed_name(context, keyname);
if (payload)
free(payload);
k5_mutex_unlock(&d->lock);
return kret;
}
static krb5_error_code
krb5_krcc_save_principal(krb5_context context, krb5_ccache id,
krb5_principal princ)
{
krb5_krcc_data *d;
krb5_error_code kret;
char *payload;
key_serial_t newkey;
unsigned int payloadsize;
krb5_krcc_bc bc;
k5_assert_locked(&((krb5_krcc_data *) id->data)->lock);
d = (krb5_krcc_data *) id->data;
payload = malloc(GUESS_CRED_SIZE);
if (payload == NULL)
return KRB5_CC_NOMEM;
bc.bpp = payload;
bc.endp = payload + GUESS_CRED_SIZE;
kret = krb5_krcc_unparse_principal(context, id, princ, &bc);
CHECK_N_GO(kret, errout);
/* Add new key into keyring */
payloadsize = bc.bpp - payload;
#ifdef KRCC_DEBUG
{
krb5_error_code rc;
char *princname = NULL;
rc = krb5_unparse_name(context, princ, &princname);
DEBUG_PRINT(("krb5_krcc_save_principal: adding new key '%s' "
"to keyring %d for principal '%s'\n",
KRCC_SPEC_PRINC_KEYNAME, d->ring_id,
rc ? "<unknown>" : princname));
if (rc == 0)
krb5_free_unparsed_name(context, princname);
}
#endif
newkey = add_key(KRCC_KEY_TYPE_USER, KRCC_SPEC_PRINC_KEYNAME, payload,
payloadsize, d->ring_id);
if (newkey < 0) {
kret = errno;
DEBUG_PRINT(("Error adding principal key: %s\n", strerror(kret)));
} else {
d->princ_id = newkey;
kret = KRB5_OK;
}
errout:
free(payload);
return kret;
}
static krb5_error_code
krb5_krcc_retrieve_principal(krb5_context context, krb5_ccache id,
krb5_principal * princ)
{
krb5_krcc_data *d = (krb5_krcc_data *) id->data;
krb5_error_code kret;
void *payload = NULL;
int psize;
krb5_krcc_bc bc;
kret = k5_mutex_lock(&d->lock);
if (kret)
return kret;
if (!d->princ_id) {
princ = 0L;
kret = KRB5_FCC_NOFILE;
goto errout;
}
psize = keyctl_read_alloc(d->princ_id, &payload);
if (psize == -1) {
DEBUG_PRINT(("Reading principal key %d: %s\n",
d->princ_id, strerror(errno)));
kret = KRB5_CC_IO;
goto errout;
}
bc.bpp = payload;
bc.endp = (char *)payload + psize;
kret = krb5_krcc_parse_principal(context, id, princ, &bc);
errout:
if (payload)
free(payload);
k5_mutex_unlock(&d->lock);
return kret;
}
static int
krb5_krcc_get_ring_ids(krb5_krcc_ring_ids_t *p)
{
key_serial_t ids_key;
char ids_buf[128];
key_serial_t session, process, thread;
long val;
DEBUG_PRINT(("krb5_krcc_get_ring_ids: entered\n"));
if (!p)
return EINVAL;
/* Use the defaults in case we find no ids key */
p->session = KEY_SPEC_SESSION_KEYRING;
p->process = KEY_SPEC_PROCESS_KEYRING;
p->thread = KEY_SPEC_THREAD_KEYRING;
/*
* Note that in the "normal" case, this will not be found.
* The Linux gssd creates this key while creating a
* context to communicate the user's key serial numbers.
*/
ids_key = request_key(KRCC_KEY_TYPE_USER, KRCC_SPEC_IDS_KEYNAME, NULL, 0);
if (ids_key < 0)
goto out;
DEBUG_PRINT(("krb5_krcc_get_ring_ids: processing '%s' key %d\n",
KRCC_SPEC_IDS_KEYNAME, ids_key));
/*
* Read and parse the ids file
*/
memset(ids_buf, '\0', sizeof(ids_buf));
val = keyctl_read(ids_key, ids_buf, sizeof(ids_buf));
if (val > sizeof(ids_buf))
goto out;
val = sscanf(ids_buf, "%d:%d:%d", &session, &process, &thread);
if (val != 3)
goto out;
p->session = session;
p->process = process;
p->thread = thread;
out:
DEBUG_PRINT(("krb5_krcc_get_ring_ids: returning %d:%d:%d\n",
p->session, p->process, p->thread));
return 0;
}
/*
* ===============================================================
* INTERNAL functions to parse a credential from a key payload
* (Borrowed heavily from krb5_fcc_{read|store}_ funtions.)
* ===============================================================
*/
/*
* Effects:
* Copies len bytes from the key payload buffer into buf.
* Updates payload pointer and returns KRB5_CC_END if we
* try to read past the end of the payload buffer's data.
*
* Requires:
* Must be called with mutex locked.
*
* Errors:
* KRB5_CC_END - there were not len bytes available
*/
static krb5_error_code
krb5_krcc_parse(krb5_context context, krb5_ccache id, krb5_pointer buf,
unsigned int len, krb5_krcc_bc * bc)
{
DEBUG_PRINT(("krb5_krcc_parse: entered\n"));
if ((bc->endp == bc->bpp) || (bc->endp - bc->bpp) < len)
return KRB5_CC_END;
memcpy(buf, bc->bpp, len);
bc->bpp += len;
return KRB5_OK;
}
/*
* Take a key (credential) read from a keyring entry
* and parse it into a credential structure.
*/
static krb5_error_code
krb5_krcc_parse_cred(krb5_context context, krb5_ccache id, krb5_creds * creds,
char *payload, int psize)
{
krb5_error_code kret;
krb5_octet octet;
krb5_int32 int32;
krb5_krcc_bc bc;
/* Parse the pieces of the credential */
bc.bpp = payload;
bc.endp = bc.bpp + psize;
kret = krb5_krcc_parse_principal(context, id, &creds->client, &bc);
CHECK_N_GO(kret, out);
kret = krb5_krcc_parse_principal(context, id, &creds->server, &bc);
CHECK_N_GO(kret, cleanclient);
kret = krb5_krcc_parse_keyblock(context, id, &creds->keyblock, &bc);
CHECK_N_GO(kret, cleanserver);
kret = krb5_krcc_parse_times(context, id, &creds->times, &bc);
CHECK_N_GO(kret, cleanserver);
kret = krb5_krcc_parse_octet(context, id, &octet, &bc);
CHECK_N_GO(kret, cleanserver);
creds->is_skey = octet;
kret = krb5_krcc_parse_int32(context, id, &int32, &bc);
CHECK_N_GO(kret, cleanserver);
creds->ticket_flags = int32;
kret = krb5_krcc_parse_addrs(context, id, &creds->addresses, &bc);
CHECK_N_GO(kret, cleanblock);
kret = krb5_krcc_parse_authdata(context, id, &creds->authdata, &bc);
CHECK_N_GO(kret, cleanaddrs);
kret = krb5_krcc_parse_krb5data(context, id, &creds->ticket, &bc);
CHECK_N_GO(kret, cleanauthdata);
kret = krb5_krcc_parse_krb5data(context, id, &creds->second_ticket, &bc);
CHECK_N_GO(kret, cleanticket);
kret = KRB5_OK;
goto out;
cleanticket:
memset(creds->ticket.data, 0, (unsigned) creds->ticket.length);
krb5_xfree(creds->ticket.data);
cleanauthdata:
/* XXX ??? */
cleanaddrs:
krb5_free_addresses(context, creds->addresses);
cleanblock:
krb5_xfree(creds->keyblock.contents);
cleanserver:
krb5_free_principal(context, creds->server);
cleanclient:
krb5_free_principal(context, creds->client);
out:
return kret;
}
static krb5_error_code
krb5_krcc_parse_principal(krb5_context context, krb5_ccache id,
krb5_principal * princ, krb5_krcc_bc * bc)
{
krb5_error_code kret;
register krb5_principal tmpprinc;
krb5_int32 length, type;
int i;
/* Read principal type */
kret = krb5_krcc_parse_int32(context, id, &type, bc);
if (kret != KRB5_OK)
return kret;
/* Read the number of components */
kret = krb5_krcc_parse_int32(context, id, &length, bc);
if (kret != KRB5_OK)
return kret;
if (length < 0)
return KRB5_CC_NOMEM;
tmpprinc = (krb5_principal) malloc(sizeof(krb5_principal_data));
if (tmpprinc == NULL)
return KRB5_CC_NOMEM;
if (length) {
size_t msize = length;
if (msize != length) {
free(tmpprinc);
return KRB5_CC_NOMEM;
}
tmpprinc->data = ALLOC(msize, krb5_data);
if (tmpprinc->data == 0) {
free((char *) tmpprinc);
return KRB5_CC_NOMEM;
}
} else
tmpprinc->data = 0;
tmpprinc->magic = KV5M_PRINCIPAL;
tmpprinc->length = length;
tmpprinc->type = type;
kret = krb5_krcc_parse_krb5data(context, id,
krb5_princ_realm(context, tmpprinc), bc);
i = 0;
CHECK(kret);
for (i = 0; i < length; i++) {
kret = krb5_krcc_parse_krb5data(context, id,
krb5_princ_component(context, tmpprinc,
i), bc);
CHECK(kret);
}
*princ = tmpprinc;
return KRB5_OK;
errout:
while (--i >= 0)
free(krb5_princ_component(context, tmpprinc, i)->data);
free((char *) tmpprinc->data);
free((char *) tmpprinc);
return kret;
}
static krb5_error_code
krb5_krcc_parse_keyblock(krb5_context context, krb5_ccache id,
krb5_keyblock * keyblock, krb5_krcc_bc * bc)
{
krb5_error_code kret;
krb5_ui_2 ui2;
krb5_int32 int32;
keyblock->magic = KV5M_KEYBLOCK;
keyblock->contents = 0;
kret = krb5_krcc_parse_ui_2(context, id, &ui2, bc);
CHECK(kret);
keyblock->enctype = ui2;
kret = krb5_krcc_parse_int32(context, id, &int32, bc);
CHECK(kret);
if (int32 < 0)
return KRB5_CC_NOMEM;
keyblock->length = int32;
/* Overflow check. */
if (keyblock->length != int32)
return KRB5_CC_NOMEM;
if (keyblock->length == 0)
return KRB5_OK;
keyblock->contents = ALLOC(keyblock->length, krb5_octet);
if (keyblock->contents == NULL)
return KRB5_CC_NOMEM;
kret = krb5_krcc_parse(context, id, keyblock->contents,
keyblock->length, bc);
CHECK(kret);
return KRB5_OK;
errout:
if (keyblock->contents)
krb5_xfree(keyblock->contents);
return kret;
}
static krb5_error_code
krb5_krcc_parse_times(krb5_context context, krb5_ccache id,
krb5_ticket_times * t, krb5_krcc_bc * bc)
{
krb5_error_code kret;
krb5_int32 i;
kret = krb5_krcc_parse_int32(context, id, &i, bc);
CHECK(kret);
t->authtime = i;
kret = krb5_krcc_parse_int32(context, id, &i, bc);
CHECK(kret);
t->starttime = i;
kret = krb5_krcc_parse_int32(context, id, &i, bc);
CHECK(kret);
t->endtime = i;
kret = krb5_krcc_parse_int32(context, id, &i, bc);
CHECK(kret);
t->renew_till = i;
return 0;
errout:
return kret;
}
static krb5_error_code
krb5_krcc_parse_krb5data(krb5_context context, krb5_ccache id,
krb5_data * data, krb5_krcc_bc * bc)
{
krb5_error_code kret;
krb5_int32 len;
data->magic = KV5M_DATA;
data->data = 0;
kret = krb5_krcc_parse_int32(context, id, &len, bc);
CHECK(kret);
if (len < 0)
return KRB5_CC_NOMEM;
data->length = len;
if (data->length != len || data->length + 1 == 0)
return KRB5_CC_NOMEM;
if (data->length == 0) {
data->data = 0;
return KRB5_OK;
}
data->data = (char *) malloc(data->length + 1);
if (data->data == NULL)
return KRB5_CC_NOMEM;
kret = krb5_krcc_parse(context, id, data->data, (unsigned) data->length,
bc);
CHECK(kret);
data->data[data->length] = 0; /* Null terminate, just in case.... */
return KRB5_OK;
errout:
if (data->data)
krb5_xfree(data->data);
return kret;
}
static krb5_error_code
krb5_krcc_parse_int32(krb5_context context, krb5_ccache id, krb5_int32 * i,
krb5_krcc_bc * bc)
{
krb5_error_code kret;
unsigned char buf[4];
krb5_int32 val;
kret = krb5_krcc_parse(context, id, buf, 4, bc);
if (kret)
return kret;
val = buf[0];
val = (val << 8) | buf[1];
val = (val << 8) | buf[2];
val = (val << 8) | buf[3];
*i = val;
return 0;
}
static krb5_error_code
krb5_krcc_parse_octet(krb5_context context, krb5_ccache id, krb5_octet * i,
krb5_krcc_bc * bc)
{
return krb5_krcc_parse(context, id, (krb5_pointer) i, 1, bc);
}
static krb5_error_code
krb5_krcc_parse_addrs(krb5_context context, krb5_ccache id,
krb5_address *** addrs, krb5_krcc_bc * bc)
{
krb5_error_code kret;
krb5_int32 length;
size_t msize;
int i;
*addrs = 0;
/* Read the number of components */
kret = krb5_krcc_parse_int32(context, id, &length, bc);
CHECK(kret);
/*
* Make *addrs able to hold length pointers to krb5_address structs
* Add one extra for a null-terminated list
*/
msize = length;
msize += 1;
if (msize == 0 || msize - 1 != length || length < 0)
return KRB5_CC_NOMEM;
*addrs = ALLOC(msize, krb5_address *);
if (*addrs == NULL)
return KRB5_CC_NOMEM;
for (i = 0; i < length; i++) {
(*addrs)[i] = (krb5_address *) malloc(sizeof(krb5_address));
if ((*addrs)[i] == NULL) {
krb5_free_addresses(context, *addrs);
return KRB5_CC_NOMEM;
}
kret = krb5_krcc_parse_addr(context, id, (*addrs)[i], bc);
CHECK(kret);
}
return KRB5_OK;
errout:
if (*addrs)
krb5_free_addresses(context, *addrs);
return kret;
}
static krb5_error_code
krb5_krcc_parse_addr(krb5_context context, krb5_ccache id, krb5_address * addr,
krb5_krcc_bc * bc)
{
krb5_error_code kret;
krb5_ui_2 ui2;
krb5_int32 int32;
addr->magic = KV5M_ADDRESS;
addr->contents = 0;
kret = krb5_krcc_parse_ui_2(context, id, &ui2, bc);
CHECK(kret);
addr->addrtype = ui2;
kret = krb5_krcc_parse_int32(context, id, &int32, bc);
CHECK(kret);
if ((int32 & VALID_INT_BITS) != int32) /* Overflow int??? */
return KRB5_CC_NOMEM;
addr->length = int32;
/*
* Length field is "unsigned int", which may be smaller
* than 32 bits.
*/
if (addr->length != int32)
return KRB5_CC_NOMEM; /* XXX */
if (addr->length == 0)
return KRB5_OK;
addr->contents = (krb5_octet *) malloc(addr->length);
if (addr->contents == NULL)
return KRB5_CC_NOMEM;
kret = krb5_krcc_parse(context, id, addr->contents, addr->length, bc);
CHECK(kret);
return KRB5_OK;
errout:
if (addr->contents)
krb5_xfree(addr->contents);
return kret;
}
static krb5_error_code
krb5_krcc_parse_authdata(krb5_context context, krb5_ccache id,
krb5_authdata *** a, krb5_krcc_bc * bc)
{
krb5_error_code kret;
krb5_int32 length;
size_t msize;
int i;
*a = 0;
/* Read the number of components */
kret = krb5_krcc_parse_int32(context, id, &length, bc);
CHECK(kret);
if (length == 0)
return KRB5_OK;
/*
* Make *a able to hold length pointers to krb5_authdata structs
* Add one extra for a null-terminated list
*/
msize = length;
msize += 1;
if (msize == 0 || msize - 1 != length || length < 0)
return KRB5_CC_NOMEM;
*a = ALLOC(msize, krb5_authdata *);
if (*a == NULL)
return KRB5_CC_NOMEM;
for (i = 0; i < length; i++) {
(*a)[i] = (krb5_authdata *) malloc(sizeof(krb5_authdata));
if ((*a)[i] == NULL) {
krb5_free_authdata(context, *a);
return KRB5_CC_NOMEM;
}
kret = krb5_krcc_parse_authdatum(context, id, (*a)[i], bc);
CHECK(kret);
}
return KRB5_OK;
errout:
if (*a)
krb5_free_authdata(context, *a);
return kret;
}
static krb5_error_code
krb5_krcc_parse_authdatum(krb5_context context, krb5_ccache id,
krb5_authdata * a, krb5_krcc_bc * bc)
{
krb5_error_code kret;
krb5_int32 int32;
krb5_ui_2 ui2;
a->magic = KV5M_AUTHDATA;
a->contents = NULL;
kret = krb5_krcc_parse_ui_2(context, id, &ui2, bc);
CHECK(kret);
a->ad_type = (krb5_authdatatype) ui2;
kret = krb5_krcc_parse_int32(context, id, &int32, bc);
CHECK(kret);
if ((int32 & VALID_INT_BITS) != int32) /* Overflow int??? */
return KRB5_CC_NOMEM;
a->length = int32;
/*
* Value could have gotten truncated if int is
* smaller than 32 bits.
*/
if (a->length != int32)
return KRB5_CC_NOMEM; /* XXX */
if (a->length == 0)
return KRB5_OK;
a->contents = (krb5_octet *) malloc(a->length);
if (a->contents == NULL)
return KRB5_CC_NOMEM;
kret = krb5_krcc_parse(context, id, a->contents, a->length, bc);
CHECK(kret);
return KRB5_OK;
errout:
if (a->contents)
krb5_xfree(a->contents);
return kret;
}
static krb5_error_code
krb5_krcc_parse_ui_2(krb5_context context, krb5_ccache id, krb5_ui_2 * i,
krb5_krcc_bc * bc)
{
krb5_error_code kret;
unsigned char buf[2];
kret = krb5_krcc_parse(context, id, buf, 2, bc);
if (kret)
return kret;
*i = (buf[0] << 8) + buf[1];
return 0;
}
/*
* Requires:
* locked mutex
*
* Effects:
* Copies len bytes from buf into the payload buffer (bc->bpp).
* Detects attempts to write past end of the payload buffer.
* Updates payload buffer pointer accordingly.
*
* Errors:
* system errors
*/
static krb5_error_code
krb5_krcc_unparse(krb5_context context, krb5_ccache id, krb5_pointer buf,
unsigned int len, krb5_krcc_bc * bc)
{
if (bc->bpp + len > bc->endp)
return KRB5_CC_WRITE;
memcpy(bc->bpp, buf, len);
bc->bpp += len;
return KRB5_OK;
}
static krb5_error_code
krb5_krcc_unparse_principal(krb5_context context, krb5_ccache id,
krb5_principal princ, krb5_krcc_bc * bc)
{
krb5_error_code kret;
krb5_int32 i, length, tmp, type;
type = krb5_princ_type(context, princ);
tmp = length = krb5_princ_size(context, princ);
kret = krb5_krcc_unparse_int32(context, id, type, bc);
CHECK_OUT(kret);
kret = krb5_krcc_unparse_int32(context, id, tmp, bc);
CHECK_OUT(kret);
kret = krb5_krcc_unparse_krb5data(context, id,
krb5_princ_realm(context, princ), bc);
CHECK_OUT(kret);
for (i = 0; i < length; i++) {
kret = krb5_krcc_unparse_krb5data(context, id,
krb5_princ_component(context, princ,
i), bc);
CHECK_OUT(kret);
}
return KRB5_OK;
}
static krb5_error_code
krb5_krcc_unparse_keyblock(krb5_context context, krb5_ccache id,
krb5_keyblock * keyblock, krb5_krcc_bc * bc)
{
krb5_error_code kret;
kret = krb5_krcc_unparse_ui_2(context, id, keyblock->enctype, bc);
CHECK_OUT(kret);
kret = krb5_krcc_unparse_ui_4(context, id, keyblock->length, bc);
CHECK_OUT(kret);
return krb5_krcc_unparse(context, id, (char *) keyblock->contents,
keyblock->length, bc);
}
static krb5_error_code
krb5_krcc_unparse_times(krb5_context context, krb5_ccache id,
krb5_ticket_times * t, krb5_krcc_bc * bc)
{
krb5_error_code kret;
kret = krb5_krcc_unparse_int32(context, id, t->authtime, bc);
CHECK_OUT(kret);
kret = krb5_krcc_unparse_int32(context, id, t->starttime, bc);
CHECK_OUT(kret);
kret = krb5_krcc_unparse_int32(context, id, t->endtime, bc);
CHECK_OUT(kret);
kret = krb5_krcc_unparse_int32(context, id, t->renew_till, bc);
CHECK_OUT(kret);
return 0;
}
static krb5_error_code
krb5_krcc_unparse_krb5data(krb5_context context, krb5_ccache id,
krb5_data * data, krb5_krcc_bc * bc)
{
krb5_error_code kret;
kret = krb5_krcc_unparse_ui_4(context, id, data->length, bc);
CHECK_OUT(kret);
return krb5_krcc_unparse(context, id, data->data, data->length, bc);
}
static krb5_error_code
krb5_krcc_unparse_int32(krb5_context context, krb5_ccache id, krb5_int32 i,
krb5_krcc_bc * bc)
{
unsigned char buf[4];
buf[3] = (unsigned char) (i & 0xFF);
i >>= 8;
buf[2] = (unsigned char) (i & 0xFF);
i >>= 8;
buf[1] = (unsigned char) (i & 0xFF);
i >>= 8;
buf[0] = (unsigned char) (i & 0xFF);
return krb5_krcc_unparse(context, id, buf, 4, bc);
}
static krb5_error_code
krb5_krcc_unparse_octet(krb5_context context, krb5_ccache id, krb5_int32 i,
krb5_krcc_bc * bc)
{
krb5_octet ibuf;
ibuf = (krb5_octet) i;
return krb5_krcc_unparse(context, id, (char *) &ibuf, 1, bc);
}
static krb5_error_code
krb5_krcc_unparse_addrs(krb5_context context, krb5_ccache id,
krb5_address ** addrs, krb5_krcc_bc * bc)
{
krb5_error_code kret;
krb5_address **temp;
krb5_int32 i, length = 0;
/* Count the number of components */
if (addrs) {
temp = addrs;
while (*temp++)
length += 1;
}
kret = krb5_krcc_unparse_int32(context, id, length, bc);
CHECK_OUT(kret);
for (i = 0; i < length; i++) {
kret = krb5_krcc_unparse_addr(context, id, addrs[i], bc);
CHECK_OUT(kret);
}
return KRB5_OK;
}
static krb5_error_code
krb5_krcc_unparse_addr(krb5_context context, krb5_ccache id,
krb5_address * addr, krb5_krcc_bc * bc)
{
krb5_error_code kret;
kret = krb5_krcc_unparse_ui_2(context, id, addr->addrtype, bc);
CHECK_OUT(kret);
kret = krb5_krcc_unparse_ui_4(context, id, addr->length, bc);
CHECK_OUT(kret);
return krb5_krcc_unparse(context, id, (char *) addr->contents,
addr->length, bc);
}
static krb5_error_code
krb5_krcc_unparse_authdata(krb5_context context, krb5_ccache id,
krb5_authdata ** a, krb5_krcc_bc * bc)
{
krb5_error_code kret;
krb5_authdata **temp;
krb5_int32 i, length = 0;
if (a != NULL) {
for (temp = a; *temp; temp++)
length++;
}
kret = krb5_krcc_unparse_int32(context, id, length, bc);
CHECK_OUT(kret);
for (i = 0; i < length; i++) {
kret = krb5_krcc_unparse_authdatum(context, id, a[i], bc);
CHECK_OUT(kret);
}
return KRB5_OK;
}
static krb5_error_code
krb5_krcc_unparse_authdatum(krb5_context context, krb5_ccache id,
krb5_authdata * a, krb5_krcc_bc * bc)
{
krb5_error_code kret;
kret = krb5_krcc_unparse_ui_2(context, id, a->ad_type, bc);
CHECK_OUT(kret);
kret = krb5_krcc_unparse_ui_4(context, id, a->length, bc);
CHECK_OUT(kret);
return krb5_krcc_unparse(context, id, (krb5_pointer) a->contents,
a->length, bc);
}
static krb5_error_code
krb5_krcc_unparse_ui_4(krb5_context context, krb5_ccache id, krb5_ui_4 i,
krb5_krcc_bc * bc)
{
unsigned char buf[4];
buf[3] = (unsigned char) (i & 0xFF);
i >>= 8;
buf[2] = (unsigned char) (i & 0xFF);
i >>= 8;
buf[1] = (unsigned char) (i & 0xFF);
i >>= 8;
buf[0] = (unsigned char) (i & 0xFF);
return krb5_krcc_unparse(context, id, buf, 4, bc);
}
static krb5_error_code
krb5_krcc_unparse_ui_2(krb5_context context, krb5_ccache id, krb5_int32 i,
krb5_krcc_bc * bc)
{
unsigned char buf[2];
buf[1] = (unsigned char) (i & 0xFF);
i >>= 8;
buf[0] = (unsigned char) (i & 0xFF);
return krb5_krcc_unparse(context, id, buf, 2, bc);
}
/*
* ===============================================================
* INTERNAL functions to unparse a credential into a key payload
* (Borrowed heavily from krb5_fcc_{read|store}_ funtions.)
* ===============================================================
*/
/*
* Take a credential structure and unparse it (serialize)
* for storage into a keyring key entry.
* Caller is responsible for freeing returned buffer.
*/
static krb5_error_code
krb5_krcc_unparse_cred(krb5_context context, krb5_ccache id,
krb5_creds * creds, char **datapp, unsigned int *lenptr)
{
krb5_error_code kret;
char *buf;
krb5_krcc_bc bc;
if (!creds || !datapp || !lenptr)
return EINVAL;
*datapp = NULL;
*lenptr = 0;
buf = malloc(GUESS_CRED_SIZE);
if (buf == NULL)
return KRB5_CC_NOMEM;
bc.bpp = buf;
bc.endp = buf + GUESS_CRED_SIZE;
kret = krb5_krcc_unparse_principal(context, id, creds->client, &bc);
CHECK_N_GO(kret, errout);
kret = krb5_krcc_unparse_principal(context, id, creds->server, &bc);
CHECK_N_GO(kret, errout);
kret = krb5_krcc_unparse_keyblock(context, id, &creds->keyblock, &bc);
CHECK_N_GO(kret, errout);
kret = krb5_krcc_unparse_times(context, id, &creds->times, &bc);
CHECK_N_GO(kret, errout);
kret = krb5_krcc_unparse_octet(context, id, (krb5_int32) creds->is_skey,
&bc);
CHECK_N_GO(kret, errout);
kret = krb5_krcc_unparse_int32(context, id, creds->ticket_flags, &bc);
CHECK_N_GO(kret, errout);
kret = krb5_krcc_unparse_addrs(context, id, creds->addresses, &bc);
CHECK_N_GO(kret, errout);
kret = krb5_krcc_unparse_authdata(context, id, creds->authdata, &bc);
CHECK_N_GO(kret, errout);
kret = krb5_krcc_unparse_krb5data(context, id, &creds->ticket, &bc);
CHECK_N_GO(kret, errout);
kret = krb5_krcc_unparse_krb5data(context, id, &creds->second_ticket, &bc);
CHECK_N_GO(kret, errout);
/* Success! */
*datapp = buf;
*lenptr = bc.bpp - buf;
kret = KRB5_OK;
errout:
return kret;
}
/*
* ccache implementation storing credentials in the Linux keyring facility
* The default is to put them at the session keyring level.
* If "KEYRING:process:" or "KEYRING:thread:" is specified, then they will
* be stored at the process or thread level respectively.
*/
const krb5_cc_ops krb5_krcc_ops = {
0,
"KEYRING",
krb5_krcc_get_name,
krb5_krcc_resolve,
krb5_krcc_generate_new,
krb5_krcc_initialize,
krb5_krcc_destroy,
krb5_krcc_close,
krb5_krcc_store,
krb5_krcc_retrieve,
krb5_krcc_get_principal,
krb5_krcc_start_seq_get,
krb5_krcc_next_cred,
krb5_krcc_end_seq_get,
krb5_krcc_remove_cred,
krb5_krcc_set_flags,
krb5_krcc_get_flags /* added after 1.4 release */
};
#else /* !USE_KEYRING_CCACHE */
/*
* Export this, but it shouldn't be used.
*/
const krb5_cc_ops krb5_krcc_ops = {
0,
"KEYRING",
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL /* added after 1.4 release */
};
#endif /* USE_KEYRING_CCACHE */
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