418 lines
8.7 KiB
C
418 lines
8.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2008 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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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <sys/queue.h>
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#include <rpc/rpc.h>
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#include <rpc/rpcsec_gss.h>
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#include "rpcsec_gss_int.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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#ifndef _PATH_GSS_QOP
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#define _PATH_GSS_QOP "/etc/gss/qop"
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#endif
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struct mech_info {
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SLIST_ENTRY(mech_info) link;
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char *name;
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gss_OID_desc oid;
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const char **qops;
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char *lib;
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char *kobj;
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};
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SLIST_HEAD(mech_info_list, mech_info);
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static struct mech_info_list mechs = SLIST_HEAD_INITIALIZER(mechs);
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static const char **mech_names;
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struct qop_info {
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SLIST_ENTRY(qop_info) link;
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char *name;
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char* mech;
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u_int qop;
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};
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SLIST_HEAD(qop_info_list, qop_info);
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static struct qop_info_list qops = SLIST_HEAD_INITIALIZER(qops);
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static int
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_rpc_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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/*
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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 = 0;
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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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u_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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u_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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static void
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_rpc_gss_load_mech(void)
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{
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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 mech_info *info;
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int count;
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const char **pp;
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if (SLIST_FIRST(&mechs))
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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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return;
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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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info = malloc(sizeof(struct mech_info));
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if (!info)
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break;
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if (_rpc_gss_string_to_oid(oid, &info->oid)) {
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free(info);
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continue;
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}
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info->name = strdup(name);
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info->qops = NULL;
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info->lib = strdup(lib);
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info->kobj = strdup(kobj);
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SLIST_INSERT_HEAD(&mechs, info, link);
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count++;
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}
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fclose(fp);
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mech_names = malloc((count + 1) * sizeof(char*));
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pp = mech_names;
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SLIST_FOREACH(info, &mechs, link) {
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*pp++ = info->name;
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}
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*pp = NULL;
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}
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static void
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_rpc_gss_load_qop(void)
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{
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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, *num, *mech;
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struct mech_info *minfo;
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struct qop_info *info;
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int count;
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const char **mech_qops;
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const char **pp;
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if (SLIST_FIRST(&qops))
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return;
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fp = fopen(_PATH_GSS_QOP, "r");
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if (!fp)
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return;
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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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num = strsep(&p, "\t\n ");
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if (p) while (isspace(*p)) p++;
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mech = strsep(&p, "\t\n ");
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if (!name || !num || !mech)
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continue;
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info = malloc(sizeof(struct qop_info));
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if (!info)
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break;
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info->name = strdup(name);
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info->qop = strtoul(name, 0, 0);
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info->mech = strdup(mech);
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SLIST_INSERT_HEAD(&qops, info, link);
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}
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fclose(fp);
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/*
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* Compile lists of qops for each mechanism.
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*/
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SLIST_FOREACH(minfo, &mechs, link) {
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count = 0;
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SLIST_FOREACH(info, &qops, link) {
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if (strcmp(info->mech, minfo->name) == 0)
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count++;
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}
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mech_qops = malloc((count + 1) * sizeof(char*));
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pp = mech_qops;
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SLIST_FOREACH(info, &qops, link) {
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if (strcmp(info->mech, minfo->name) == 0)
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*pp++ = info->name;
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}
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*pp = NULL;
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minfo->qops = mech_qops;
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}
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}
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bool_t
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rpc_gss_mech_to_oid(const char *mech, gss_OID *oid_ret)
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{
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struct mech_info *info;
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_rpc_gss_load_mech();
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SLIST_FOREACH(info, &mechs, link) {
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if (!strcmp(info->name, mech)) {
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*oid_ret = &info->oid;
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return (TRUE);
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}
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}
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_rpc_gss_set_error(RPC_GSS_ER_SYSTEMERROR, ENOENT);
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return (FALSE);
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}
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bool_t
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rpc_gss_oid_to_mech(gss_OID oid, const char **mech_ret)
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{
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struct mech_info *info;
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_rpc_gss_load_mech();
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SLIST_FOREACH(info, &mechs, link) {
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if (oid->length == info->oid.length
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&& !memcmp(oid->elements, info->oid.elements,
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oid->length)) {
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*mech_ret = info->name;
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return (TRUE);
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}
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}
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_rpc_gss_set_error(RPC_GSS_ER_SYSTEMERROR, ENOENT);
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return (FALSE);
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}
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bool_t
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rpc_gss_qop_to_num(const char *qop, const char *mech, u_int *num_ret)
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{
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struct qop_info *info;
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_rpc_gss_load_qop();
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SLIST_FOREACH(info, &qops, link) {
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if (strcmp(info->name, qop) == 0
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&& strcmp(info->mech, mech) == 0) {
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*num_ret = info->qop;
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return (TRUE);
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}
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}
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_rpc_gss_set_error(RPC_GSS_ER_SYSTEMERROR, ENOENT);
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return (FALSE);
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}
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const char *
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_rpc_gss_num_to_qop(const char *mech, u_int num)
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{
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struct qop_info *info;
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if (num == GSS_C_QOP_DEFAULT)
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return "default";
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_rpc_gss_load_qop();
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SLIST_FOREACH(info, &qops, link) {
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if (info->qop == num && strcmp(info->mech, mech) == 0) {
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return (info->name);
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}
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}
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return (NULL);
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}
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const char **
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rpc_gss_get_mechanisms(void)
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{
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_rpc_gss_load_mech();
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return (mech_names);
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}
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const char **
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rpc_gss_get_mech_info(const char *mech, rpc_gss_service_t *service)
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{
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struct mech_info *info;
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_rpc_gss_load_mech();
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_rpc_gss_load_qop();
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SLIST_FOREACH(info, &mechs, link) {
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if (!strcmp(mech, info->name)) {
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/*
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* I'm not sure what to do with service
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* here. The Solaris manpages are not clear on
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* the subject and the OpenSolaris code just
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* sets it to rpc_gss_svc_privacy
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* unconditionally with a comment noting that
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* it is bogus.
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*/
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*service = rpc_gss_svc_privacy;
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return info->qops;
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}
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}
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_rpc_gss_set_error(RPC_GSS_ER_SYSTEMERROR, ENOENT);
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return (NULL);
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}
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bool_t
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rpc_gss_get_versions(u_int *vers_hi, u_int *vers_lo)
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{
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*vers_hi = 1;
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*vers_lo = 1;
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return (TRUE);
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}
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bool_t
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rpc_gss_is_installed(const char *mech)
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{
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struct mech_info *info;
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_rpc_gss_load_mech();
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SLIST_FOREACH(info, &mechs, link)
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if (!strcmp(mech, info->name))
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return (TRUE);
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return (FALSE);
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}
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