1de7b4b805
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
490 lines
12 KiB
C
490 lines
12 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
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* based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
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* Internet Initiative Japan, Inc (IIJ)
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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 <sys/param.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <pwd.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 <termios.h>
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#include <unistd.h>
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#ifndef NOPAM
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#include <security/pam_appl.h>
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#ifdef OPENPAM
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#include <security/openpam.h>
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#endif
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#endif /* !NOPAM */
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#include "layer.h"
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#include "mbuf.h"
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#include "defs.h"
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#include "log.h"
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#include "timer.h"
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#include "fsm.h"
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#include "iplist.h"
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#include "throughput.h"
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#include "slcompress.h"
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#include "lqr.h"
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#include "hdlc.h"
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#include "ncpaddr.h"
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#include "ipcp.h"
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#include "auth.h"
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#include "systems.h"
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#include "lcp.h"
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#include "ccp.h"
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#include "link.h"
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#include "descriptor.h"
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#include "chat.h"
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#include "proto.h"
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#include "filter.h"
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#include "mp.h"
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#ifndef NORADIUS
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#include "radius.h"
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#endif
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#include "cbcp.h"
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#include "chap.h"
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#include "async.h"
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#include "physical.h"
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#include "datalink.h"
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#include "ipv6cp.h"
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#include "ncp.h"
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#include "bundle.h"
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const char *
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Auth2Nam(u_short auth, u_char type)
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{
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static char chap[10];
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switch (auth) {
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case PROTO_PAP:
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return "PAP";
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case PROTO_CHAP:
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snprintf(chap, sizeof chap, "CHAP 0x%02x", type);
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return chap;
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case 0:
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return "none";
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}
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return "unknown";
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}
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#if !defined(NOPAM) && !defined(OPENPAM)
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static int
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pam_conv(int n, const struct pam_message **msg, struct pam_response **resp,
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void *data)
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{
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if (n != 1 || msg[0]->msg_style != PAM_PROMPT_ECHO_OFF)
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return (PAM_CONV_ERR);
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if ((*resp = malloc(sizeof(struct pam_response))) == NULL)
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return (PAM_CONV_ERR);
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(*resp)[0].resp = strdup((const char *)data);
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(*resp)[0].resp_retcode = 0;
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return ((*resp)[0].resp != NULL ? PAM_SUCCESS : PAM_CONV_ERR);
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}
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#endif /* !defined(NOPAM) && !defined(OPENPAM) */
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static int
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auth_CheckPasswd(const char *name, const char *data, const char *key)
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{
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if (!strcmp(data, "*")) {
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#ifdef NOPAM
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/* Then look up the real password database */
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struct passwd *pw;
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int result = 0;
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char *cryptpw;
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pw = getpwnam(name);
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if (pw) {
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cryptpw = crypt(key, pw->pw_passwd);
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result = (cryptpw != NULL) && !strcmp(cryptpw, pw->pw_passwd);
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}
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endpwent();
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return result;
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#else /* !NOPAM */
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/* Then consult with PAM. */
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pam_handle_t *pamh;
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int status;
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struct pam_conv pamc = {
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#ifdef OPENPAM
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&openpam_nullconv, NULL
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#else
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&pam_conv, key
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#endif
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};
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if (pam_start("ppp", name, &pamc, &pamh) != PAM_SUCCESS)
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return (0);
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#ifdef OPENPAM
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if ((status = pam_set_item(pamh, PAM_AUTHTOK, key)) == PAM_SUCCESS)
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#endif
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status = pam_authenticate(pamh, 0);
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pam_end(pamh, status);
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return (status == PAM_SUCCESS);
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#endif /* !NOPAM */
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}
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return !strcmp(data, key);
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}
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int
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auth_SetPhoneList(const char *name, char *phone, int phonelen)
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{
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FILE *fp;
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int n, lineno;
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char *vector[6], buff[LINE_LEN];
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const char *slash;
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fp = OpenSecret(SECRETFILE);
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if (fp != NULL) {
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again:
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lineno = 0;
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while (fgets(buff, sizeof buff, fp)) {
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lineno++;
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if (buff[0] == '#')
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continue;
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buff[strlen(buff) - 1] = '\0';
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memset(vector, '\0', sizeof vector);
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if ((n = MakeArgs(buff, vector, VECSIZE(vector), PARSE_REDUCE)) < 0)
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log_Printf(LogWARN, "%s: %d: Invalid line\n", SECRETFILE, lineno);
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if (n < 5)
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continue;
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if (strcmp(vector[0], name) == 0) {
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CloseSecret(fp);
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if (*vector[4] == '\0')
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return 0;
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strncpy(phone, vector[4], phonelen - 1);
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phone[phonelen - 1] = '\0';
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return 1; /* Valid */
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}
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}
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if ((slash = strrchr(name, '\\')) != NULL && slash[1]) {
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/* Look for the name without the leading domain */
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name = slash + 1;
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rewind(fp);
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goto again;
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}
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CloseSecret(fp);
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}
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*phone = '\0';
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return 0;
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}
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int
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auth_Select(struct bundle *bundle, const char *name)
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{
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FILE *fp;
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int n, lineno;
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char *vector[5], buff[LINE_LEN];
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const char *slash;
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if (*name == '\0') {
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ipcp_Setup(&bundle->ncp.ipcp, INADDR_NONE);
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return 1;
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}
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#ifndef NORADIUS
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if (bundle->radius.valid && bundle->radius.ip.s_addr != INADDR_NONE &&
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bundle->radius.ip.s_addr != RADIUS_INADDR_POOL) {
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/* We've got a radius IP - it overrides everything */
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if (!ipcp_UseHisIPaddr(bundle, bundle->radius.ip))
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return 0;
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ipcp_Setup(&bundle->ncp.ipcp, bundle->radius.mask.s_addr);
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/* Continue with ppp.secret in case we've got a new label */
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}
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#endif
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fp = OpenSecret(SECRETFILE);
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if (fp != NULL) {
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again:
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lineno = 0;
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while (fgets(buff, sizeof buff, fp)) {
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lineno++;
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if (buff[0] == '#')
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continue;
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buff[strlen(buff) - 1] = '\0';
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memset(vector, '\0', sizeof vector);
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if ((n = MakeArgs(buff, vector, VECSIZE(vector), PARSE_REDUCE)) < 0)
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log_Printf(LogWARN, "%s: %d: Invalid line\n", SECRETFILE, lineno);
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if (n < 2)
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continue;
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if (strcmp(vector[0], name) == 0) {
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CloseSecret(fp);
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#ifndef NORADIUS
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if (!bundle->radius.valid || bundle->radius.ip.s_addr == INADDR_NONE) {
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#endif
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if (n > 2 && *vector[2] && strcmp(vector[2], "*") &&
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!ipcp_UseHisaddr(bundle, vector[2], 1))
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return 0;
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ipcp_Setup(&bundle->ncp.ipcp, INADDR_NONE);
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#ifndef NORADIUS
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}
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#endif
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if (n > 3 && *vector[3] && strcmp(vector[3], "*"))
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bundle_SetLabel(bundle, vector[3]);
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return 1; /* Valid */
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}
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}
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if ((slash = strrchr(name, '\\')) != NULL && slash[1]) {
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/* Look for the name without the leading domain */
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name = slash + 1;
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rewind(fp);
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goto again;
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}
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CloseSecret(fp);
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}
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#ifndef NOPASSWDAUTH
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/* Let 'em in anyway - they must have been in the passwd file */
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ipcp_Setup(&bundle->ncp.ipcp, INADDR_NONE);
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return 1;
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#else
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#ifndef NORADIUS
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if (bundle->radius.valid)
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return 1;
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#endif
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/* Disappeared from ppp.secret ??? */
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return 0;
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#endif
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}
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int
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auth_Validate(struct bundle *bundle, const char *name, const char *key)
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{
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/* Used by PAP routines */
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FILE *fp;
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int n, lineno;
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char *vector[5], buff[LINE_LEN];
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const char *slash;
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fp = OpenSecret(SECRETFILE);
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again:
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lineno = 0;
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if (fp != NULL) {
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while (fgets(buff, sizeof buff, fp)) {
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lineno++;
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if (buff[0] == '#')
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continue;
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buff[strlen(buff) - 1] = 0;
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memset(vector, '\0', sizeof vector);
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if ((n = MakeArgs(buff, vector, VECSIZE(vector), PARSE_REDUCE)) < 0)
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log_Printf(LogWARN, "%s: %d: Invalid line\n", SECRETFILE, lineno);
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if (n < 2)
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continue;
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if (strcmp(vector[0], name) == 0) {
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CloseSecret(fp);
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return auth_CheckPasswd(name, vector[1], key);
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}
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}
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}
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if ((slash = strrchr(name, '\\')) != NULL && slash[1]) {
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/* Look for the name without the leading domain */
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name = slash + 1;
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if (fp != NULL) {
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rewind(fp);
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goto again;
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}
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}
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if (fp != NULL)
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CloseSecret(fp);
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#ifndef NOPASSWDAUTH
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if (Enabled(bundle, OPT_PASSWDAUTH))
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return auth_CheckPasswd(name, "*", key);
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#endif
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return 0; /* Invalid */
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}
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char *
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auth_GetSecret(const char *name, size_t len)
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{
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/* Used by CHAP routines */
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FILE *fp;
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int n, lineno;
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char *vector[5];
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const char *slash;
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static char buff[LINE_LEN]; /* vector[] will point here when returned */
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fp = OpenSecret(SECRETFILE);
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if (fp == NULL)
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return (NULL);
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again:
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lineno = 0;
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while (fgets(buff, sizeof buff, fp)) {
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lineno++;
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if (buff[0] == '#')
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continue;
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n = strlen(buff) - 1;
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if (buff[n] == '\n')
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buff[n] = '\0'; /* Trim the '\n' */
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memset(vector, '\0', sizeof vector);
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if ((n = MakeArgs(buff, vector, VECSIZE(vector), PARSE_REDUCE)) < 0)
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log_Printf(LogWARN, "%s: %d: Invalid line\n", SECRETFILE, lineno);
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if (n < 2)
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continue;
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if (strlen(vector[0]) == len && strncmp(vector[0], name, len) == 0) {
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CloseSecret(fp);
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return vector[1];
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}
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}
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if ((slash = strrchr(name, '\\')) != NULL && slash[1]) {
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/* Go back and look for the name without the leading domain */
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len -= slash - name + 1;
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name = slash + 1;
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rewind(fp);
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goto again;
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}
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CloseSecret(fp);
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return (NULL); /* Invalid */
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}
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static void
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AuthTimeout(void *vauthp)
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{
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struct authinfo *authp = (struct authinfo *)vauthp;
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timer_Stop(&authp->authtimer);
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if (--authp->retry > 0) {
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authp->id++;
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(*authp->fn.req)(authp);
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timer_Start(&authp->authtimer);
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} else {
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log_Printf(LogPHASE, "Auth: No response from server\n");
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datalink_AuthNotOk(authp->physical->dl);
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}
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}
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void
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auth_Init(struct authinfo *authp, struct physical *p, auth_func req,
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auth_func success, auth_func failure)
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{
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memset(authp, '\0', sizeof(struct authinfo));
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authp->cfg.fsm.timeout = DEF_FSMRETRY;
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authp->cfg.fsm.maxreq = DEF_FSMAUTHTRIES;
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authp->cfg.fsm.maxtrm = 0; /* not used */
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authp->fn.req = req;
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authp->fn.success = success;
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authp->fn.failure = failure;
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authp->physical = p;
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}
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void
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auth_StartReq(struct authinfo *authp)
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{
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timer_Stop(&authp->authtimer);
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authp->authtimer.func = AuthTimeout;
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authp->authtimer.name = "auth";
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authp->authtimer.load = authp->cfg.fsm.timeout * SECTICKS;
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authp->authtimer.arg = (void *)authp;
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authp->retry = authp->cfg.fsm.maxreq;
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authp->id = 1;
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(*authp->fn.req)(authp);
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timer_Start(&authp->authtimer);
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}
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void
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auth_StopTimer(struct authinfo *authp)
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{
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timer_Stop(&authp->authtimer);
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}
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struct mbuf *
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auth_ReadHeader(struct authinfo *authp, struct mbuf *bp)
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{
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size_t len;
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len = m_length(bp);
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if (len >= sizeof authp->in.hdr) {
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bp = mbuf_Read(bp, (u_char *)&authp->in.hdr, sizeof authp->in.hdr);
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if (len >= ntohs(authp->in.hdr.length))
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return bp;
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authp->in.hdr.length = htons(0);
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log_Printf(LogWARN, "auth_ReadHeader: Short packet (%u > %zu) !\n",
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ntohs(authp->in.hdr.length), len);
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} else {
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authp->in.hdr.length = htons(0);
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log_Printf(LogWARN, "auth_ReadHeader: Short packet header (%u > %zu) !\n",
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(int)(sizeof authp->in.hdr), len);
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}
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m_freem(bp);
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return NULL;
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}
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struct mbuf *
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auth_ReadName(struct authinfo *authp, struct mbuf *bp, size_t len)
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{
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if (len > sizeof authp->in.name - 1)
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log_Printf(LogWARN, "auth_ReadName: Name too long (%zu) !\n", len);
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else {
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size_t mlen = m_length(bp);
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if (len > mlen)
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log_Printf(LogWARN, "auth_ReadName: Short packet (%zu > %zu) !\n",
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len, mlen);
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else {
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bp = mbuf_Read(bp, (u_char *)authp->in.name, len);
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authp->in.name[len] = '\0';
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return bp;
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}
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}
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*authp->in.name = '\0';
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m_freem(bp);
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return NULL;
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}
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