317 lines
7.0 KiB
C
317 lines
7.0 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2005 Doug Rabson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <gssapi/gssapi.h>
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#include <ctype.h>
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#include <dlfcn.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "mech_switch.h"
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#include "utils.h"
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#ifndef _PATH_GSS_MECH
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#define _PATH_GSS_MECH "/etc/gss/mech"
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#endif
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struct _gss_mech_switch_list _gss_mechs =
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SLIST_HEAD_INITIALIZER(_gss_mechs);
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gss_OID_set _gss_mech_oids;
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/*
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* Convert a string containing an OID in 'dot' form
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* (e.g. 1.2.840.113554.1.2.2) to a gss_OID.
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*/
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static int
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_gss_string_to_oid(const char* s, gss_OID oid)
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{
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int number_count, i, j;
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int byte_count;
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const char *p, *q;
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char *res;
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oid->length = 0;
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oid->elements = NULL;
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/*
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* First figure out how many numbers in the oid, then
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* calculate the compiled oid size.
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*/
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number_count = 0;
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for (p = s; p; p = q) {
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q = strchr(p, '.');
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if (q) q = q + 1;
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number_count++;
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}
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/*
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* The first two numbers are in the first byte and each
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* subsequent number is encoded in a variable byte sequence.
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*/
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if (number_count < 2)
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return (EINVAL);
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/*
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* We do this in two passes. The first pass, we just figure
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* out the size. Second time around, we actually encode the
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* number.
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*/
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res = NULL;
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for (i = 0; i < 2; i++) {
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byte_count = 0;
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for (p = s, j = 0; p; p = q, j++) {
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unsigned int number = 0;
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/*
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* Find the end of this number.
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*/
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q = strchr(p, '.');
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if (q) q = q + 1;
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/*
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* Read the number of of the string. Don't
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* bother with anything except base ten.
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*/
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while (*p && *p != '.') {
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number = 10 * number + (*p - '0');
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p++;
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}
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/*
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* Encode the number. The first two numbers
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* are packed into the first byte. Subsequent
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* numbers are encoded in bytes seven bits at
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* a time with the last byte having the high
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* bit set.
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*/
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if (j == 0) {
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if (res)
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*res = number * 40;
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} else if (j == 1) {
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if (res) {
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*res += number;
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res++;
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}
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byte_count++;
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} else if (j >= 2) {
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/*
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* The number is encoded in seven bit chunks.
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*/
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unsigned int t;
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int bytes;
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bytes = 0;
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for (t = number; t; t >>= 7)
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bytes++;
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if (bytes == 0) bytes = 1;
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while (bytes) {
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if (res) {
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int bit = 7*(bytes-1);
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*res = (number >> bit) & 0x7f;
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if (bytes != 1)
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*res |= 0x80;
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res++;
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}
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byte_count++;
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bytes--;
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}
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}
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}
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if (!res) {
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res = malloc(byte_count);
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if (!res)
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return (ENOMEM);
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oid->length = byte_count;
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oid->elements = res;
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}
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}
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return (0);
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}
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#define SYM(name) \
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do { \
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snprintf(buf, sizeof(buf), "%s_%s", \
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m->gm_name_prefix, #name); \
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m->gm_ ## name = dlsym(so, buf); \
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if (!m->gm_ ## name) { \
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fprintf(stderr, "can't find symbol %s\n", buf); \
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goto bad; \
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} \
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} while (0)
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#define OPTSYM(name) \
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do { \
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snprintf(buf, sizeof(buf), "%s_%s", \
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m->gm_name_prefix, #name); \
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m->gm_ ## name = dlsym(so, buf); \
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} while (0)
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/*
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* Load the mechanisms file (/etc/gss/mech).
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*/
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void
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_gss_load_mech(void)
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{
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OM_uint32 major_status, minor_status;
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FILE *fp;
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char buf[256];
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char *p;
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char *name, *oid, *lib, *kobj;
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struct _gss_mech_switch *m;
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int count;
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void *so;
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const char *(*prefix_fn)(void);
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if (SLIST_FIRST(&_gss_mechs))
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return;
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major_status = gss_create_empty_oid_set(&minor_status,
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&_gss_mech_oids);
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if (major_status)
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return;
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fp = fopen(_PATH_GSS_MECH, "r");
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if (!fp) {
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perror(_PATH_GSS_MECH);
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return;
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}
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count = 0;
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while (fgets(buf, sizeof(buf), fp)) {
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if (*buf == '#')
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continue;
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p = buf;
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name = strsep(&p, "\t\n ");
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if (p) while (isspace(*p)) p++;
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oid = strsep(&p, "\t\n ");
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if (p) while (isspace(*p)) p++;
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lib = strsep(&p, "\t\n ");
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if (p) while (isspace(*p)) p++;
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kobj = strsep(&p, "\t\n ");
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if (!name || !oid || !lib || !kobj)
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continue;
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so = dlopen(lib, RTLD_LOCAL);
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if (!so) {
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fprintf(stderr, "dlopen: %s\n", dlerror());
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continue;
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}
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m = malloc(sizeof(struct _gss_mech_switch));
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if (!m)
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break;
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m->gm_so = so;
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if (_gss_string_to_oid(oid, &m->gm_mech_oid)) {
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free(m);
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continue;
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}
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prefix_fn = (const char *(*)(void))
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dlsym(so, "_gss_name_prefix");
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if (prefix_fn)
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m->gm_name_prefix = prefix_fn();
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else
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m->gm_name_prefix = "gss";
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major_status = gss_add_oid_set_member(&minor_status,
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&m->gm_mech_oid, &_gss_mech_oids);
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if (major_status) {
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free(m->gm_mech_oid.elements);
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free(m);
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continue;
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}
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SYM(acquire_cred);
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SYM(release_cred);
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SYM(init_sec_context);
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SYM(accept_sec_context);
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SYM(process_context_token);
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SYM(delete_sec_context);
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SYM(context_time);
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SYM(get_mic);
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SYM(verify_mic);
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SYM(wrap);
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SYM(unwrap);
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SYM(display_status);
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OPTSYM(indicate_mechs);
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SYM(compare_name);
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SYM(display_name);
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SYM(import_name);
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SYM(export_name);
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SYM(release_name);
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SYM(inquire_cred);
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SYM(inquire_context);
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SYM(wrap_size_limit);
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SYM(add_cred);
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SYM(inquire_cred_by_mech);
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SYM(export_sec_context);
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SYM(import_sec_context);
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SYM(inquire_names_for_mech);
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SYM(inquire_mechs_for_name);
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SYM(canonicalize_name);
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SYM(duplicate_name);
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OPTSYM(inquire_sec_context_by_oid);
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OPTSYM(inquire_cred_by_oid);
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OPTSYM(set_sec_context_option);
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OPTSYM(set_cred_option);
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OPTSYM(pseudo_random);
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OPTSYM(pname_to_uid);
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SLIST_INSERT_HEAD(&_gss_mechs, m, gm_link);
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count++;
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continue;
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bad:
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free(m->gm_mech_oid.elements);
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free(m);
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dlclose(so);
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continue;
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}
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fclose(fp);
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}
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struct _gss_mech_switch *
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_gss_find_mech_switch(gss_OID mech)
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{
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struct _gss_mech_switch *m;
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_gss_load_mech();
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SLIST_FOREACH(m, &_gss_mechs, gm_link) {
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if (gss_oid_equal(&m->gm_mech_oid, mech))
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return m;
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}
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return (0);
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}
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