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lwip/netif/ppp/pap.c@0:b2805b6888dc, 2016-06-20 (annotated)

Committer:
robert_jw
Date:
Mon Jun 20 01:40:20 2016 +0000
Revision:
0:b2805b6888dc
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robert_jw 0:b2805b6888dc 1 /*****************************************************************************
robert_jw 0:b2805b6888dc 2 * pap.c - Network Password Authentication Protocol program file.
robert_jw 0:b2805b6888dc 3 *
robert_jw 0:b2805b6888dc 4 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
robert_jw 0:b2805b6888dc 5 * portions Copyright (c) 1997 by Global Election Systems Inc.
robert_jw 0:b2805b6888dc 6 *
robert_jw 0:b2805b6888dc 7 * The authors hereby grant permission to use, copy, modify, distribute,
robert_jw 0:b2805b6888dc 8 * and license this software and its documentation for any purpose, provided
robert_jw 0:b2805b6888dc 9 * that existing copyright notices are retained in all copies and that this
robert_jw 0:b2805b6888dc 10 * notice and the following disclaimer are included verbatim in any
robert_jw 0:b2805b6888dc 11 * distributions. No written agreement, license, or royalty fee is required
robert_jw 0:b2805b6888dc 12 * for any of the authorized uses.
robert_jw 0:b2805b6888dc 13 *
robert_jw 0:b2805b6888dc 14 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
robert_jw 0:b2805b6888dc 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
robert_jw 0:b2805b6888dc 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
robert_jw 0:b2805b6888dc 17 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
robert_jw 0:b2805b6888dc 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
robert_jw 0:b2805b6888dc 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
robert_jw 0:b2805b6888dc 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
robert_jw 0:b2805b6888dc 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
robert_jw 0:b2805b6888dc 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
robert_jw 0:b2805b6888dc 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
robert_jw 0:b2805b6888dc 24 *
robert_jw 0:b2805b6888dc 25 ******************************************************************************
robert_jw 0:b2805b6888dc 26 * REVISION HISTORY
robert_jw 0:b2805b6888dc 27 *
robert_jw 0:b2805b6888dc 28 * 03-01-01 Marc Boucher <marc@mbsi.ca>
robert_jw 0:b2805b6888dc 29 * Ported to lwIP.
robert_jw 0:b2805b6888dc 30 * 97-12-12 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
robert_jw 0:b2805b6888dc 31 * Original.
robert_jw 0:b2805b6888dc 32 *****************************************************************************/
robert_jw 0:b2805b6888dc 33 /*
robert_jw 0:b2805b6888dc 34 * upap.c - User/Password Authentication Protocol.
robert_jw 0:b2805b6888dc 35 *
robert_jw 0:b2805b6888dc 36 * Copyright (c) 1989 Carnegie Mellon University.
robert_jw 0:b2805b6888dc 37 * All rights reserved.
robert_jw 0:b2805b6888dc 38 *
robert_jw 0:b2805b6888dc 39 * Redistribution and use in source and binary forms are permitted
robert_jw 0:b2805b6888dc 40 * provided that the above copyright notice and this paragraph are
robert_jw 0:b2805b6888dc 41 * duplicated in all such forms and that any documentation,
robert_jw 0:b2805b6888dc 42 * advertising materials, and other materials related to such
robert_jw 0:b2805b6888dc 43 * distribution and use acknowledge that the software was developed
robert_jw 0:b2805b6888dc 44 * by Carnegie Mellon University. The name of the
robert_jw 0:b2805b6888dc 45 * University may not be used to endorse or promote products derived
robert_jw 0:b2805b6888dc 46 * from this software without specific prior written permission.
robert_jw 0:b2805b6888dc 47 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
robert_jw 0:b2805b6888dc 48 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
robert_jw 0:b2805b6888dc 49 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
robert_jw 0:b2805b6888dc 50 */
robert_jw 0:b2805b6888dc 51
robert_jw 0:b2805b6888dc 52 #include "lwip/opt.h"
robert_jw 0:b2805b6888dc 53
robert_jw 0:b2805b6888dc 54 #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
robert_jw 0:b2805b6888dc 55
robert_jw 0:b2805b6888dc 56 #if PAP_SUPPORT /* don't build if not configured for use in lwipopts.h */
robert_jw 0:b2805b6888dc 57
robert_jw 0:b2805b6888dc 58 #include "ppp.h"
robert_jw 0:b2805b6888dc 59 #include "pppdebug.h"
robert_jw 0:b2805b6888dc 60
robert_jw 0:b2805b6888dc 61 #include "auth.h"
robert_jw 0:b2805b6888dc 62 #include "pap.h"
robert_jw 0:b2805b6888dc 63
robert_jw 0:b2805b6888dc 64 #include <string.h>
robert_jw 0:b2805b6888dc 65
robert_jw 0:b2805b6888dc 66 #if 0 /* UNUSED */
robert_jw 0:b2805b6888dc 67 static bool hide_password = 1;
robert_jw 0:b2805b6888dc 68
robert_jw 0:b2805b6888dc 69 /*
robert_jw 0:b2805b6888dc 70 * Command-line options.
robert_jw 0:b2805b6888dc 71 */
robert_jw 0:b2805b6888dc 72 static option_t pap_option_list[] = {
robert_jw 0:b2805b6888dc 73 { "hide-password", o_bool, &hide_password,
robert_jw 0:b2805b6888dc 74 "Don't output passwords to log", 1 },
robert_jw 0:b2805b6888dc 75 { "show-password", o_bool, &hide_password,
robert_jw 0:b2805b6888dc 76 "Show password string in debug log messages", 0 },
robert_jw 0:b2805b6888dc 77 { "pap-restart", o_int, &upap[0].us_timeouttime,
robert_jw 0:b2805b6888dc 78 "Set retransmit timeout for PAP" },
robert_jw 0:b2805b6888dc 79 { "pap-max-authreq", o_int, &upap[0].us_maxtransmits,
robert_jw 0:b2805b6888dc 80 "Set max number of transmissions for auth-reqs" },
robert_jw 0:b2805b6888dc 81 { "pap-timeout", o_int, &upap[0].us_reqtimeout,
robert_jw 0:b2805b6888dc 82 "Set time limit for peer PAP authentication" },
robert_jw 0:b2805b6888dc 83 { NULL }
robert_jw 0:b2805b6888dc 84 };
robert_jw 0:b2805b6888dc 85 #endif
robert_jw 0:b2805b6888dc 86
robert_jw 0:b2805b6888dc 87 /*
robert_jw 0:b2805b6888dc 88 * Protocol entry points.
robert_jw 0:b2805b6888dc 89 */
robert_jw 0:b2805b6888dc 90 static void upap_init (int);
robert_jw 0:b2805b6888dc 91 static void upap_lowerup (int);
robert_jw 0:b2805b6888dc 92 static void upap_lowerdown (int);
robert_jw 0:b2805b6888dc 93 static void upap_input (int, u_char *, int);
robert_jw 0:b2805b6888dc 94 static void upap_protrej (int);
robert_jw 0:b2805b6888dc 95 #if PPP_ADDITIONAL_CALLBACKS
robert_jw 0:b2805b6888dc 96 static int upap_printpkt (u_char *, int, void (*)(void *, char *, ...), void *);
robert_jw 0:b2805b6888dc 97 #endif /* PPP_ADDITIONAL_CALLBACKS */
robert_jw 0:b2805b6888dc 98
robert_jw 0:b2805b6888dc 99 struct protent pap_protent = {
robert_jw 0:b2805b6888dc 100 PPP_PAP,
robert_jw 0:b2805b6888dc 101 upap_init,
robert_jw 0:b2805b6888dc 102 upap_input,
robert_jw 0:b2805b6888dc 103 upap_protrej,
robert_jw 0:b2805b6888dc 104 upap_lowerup,
robert_jw 0:b2805b6888dc 105 upap_lowerdown,
robert_jw 0:b2805b6888dc 106 NULL,
robert_jw 0:b2805b6888dc 107 NULL,
robert_jw 0:b2805b6888dc 108 #if PPP_ADDITIONAL_CALLBACKS
robert_jw 0:b2805b6888dc 109 upap_printpkt,
robert_jw 0:b2805b6888dc 110 NULL,
robert_jw 0:b2805b6888dc 111 #endif /* PPP_ADDITIONAL_CALLBACKS */
robert_jw 0:b2805b6888dc 112 1,
robert_jw 0:b2805b6888dc 113 "PAP",
robert_jw 0:b2805b6888dc 114 #if PPP_ADDITIONAL_CALLBACKS
robert_jw 0:b2805b6888dc 115 NULL,
robert_jw 0:b2805b6888dc 116 NULL,
robert_jw 0:b2805b6888dc 117 NULL
robert_jw 0:b2805b6888dc 118 #endif /* PPP_ADDITIONAL_CALLBACKS */
robert_jw 0:b2805b6888dc 119 };
robert_jw 0:b2805b6888dc 120
robert_jw 0:b2805b6888dc 121 upap_state upap[NUM_PPP]; /* UPAP state; one for each unit */
robert_jw 0:b2805b6888dc 122
robert_jw 0:b2805b6888dc 123 static void upap_timeout (void *);
robert_jw 0:b2805b6888dc 124 static void upap_reqtimeout(void *);
robert_jw 0:b2805b6888dc 125 static void upap_rauthreq (upap_state *, u_char *, u_char, int);
robert_jw 0:b2805b6888dc 126 static void upap_rauthack (upap_state *, u_char *, int, int);
robert_jw 0:b2805b6888dc 127 static void upap_rauthnak (upap_state *, u_char *, int, int);
robert_jw 0:b2805b6888dc 128 static void upap_sauthreq (upap_state *);
robert_jw 0:b2805b6888dc 129 static void upap_sresp (upap_state *, u_char, u_char, char *, int);
robert_jw 0:b2805b6888dc 130
robert_jw 0:b2805b6888dc 131
robert_jw 0:b2805b6888dc 132 /*
robert_jw 0:b2805b6888dc 133 * upap_init - Initialize a UPAP unit.
robert_jw 0:b2805b6888dc 134 */
robert_jw 0:b2805b6888dc 135 static void
robert_jw 0:b2805b6888dc 136 upap_init(int unit)
robert_jw 0:b2805b6888dc 137 {
robert_jw 0:b2805b6888dc 138 upap_state *u = &upap[unit];
robert_jw 0:b2805b6888dc 139
robert_jw 0:b2805b6888dc 140 UPAPDEBUG(LOG_INFO, ("upap_init: %d\n", unit));
robert_jw 0:b2805b6888dc 141 u->us_unit = unit;
robert_jw 0:b2805b6888dc 142 u->us_user = NULL;
robert_jw 0:b2805b6888dc 143 u->us_userlen = 0;
robert_jw 0:b2805b6888dc 144 u->us_passwd = NULL;
robert_jw 0:b2805b6888dc 145 u->us_passwdlen = 0;
robert_jw 0:b2805b6888dc 146 u->us_clientstate = UPAPCS_INITIAL;
robert_jw 0:b2805b6888dc 147 u->us_serverstate = UPAPSS_INITIAL;
robert_jw 0:b2805b6888dc 148 u->us_id = 0;
robert_jw 0:b2805b6888dc 149 u->us_timeouttime = UPAP_DEFTIMEOUT;
robert_jw 0:b2805b6888dc 150 u->us_maxtransmits = 10;
robert_jw 0:b2805b6888dc 151 u->us_reqtimeout = UPAP_DEFREQTIME;
robert_jw 0:b2805b6888dc 152 }
robert_jw 0:b2805b6888dc 153
robert_jw 0:b2805b6888dc 154 /*
robert_jw 0:b2805b6888dc 155 * upap_authwithpeer - Authenticate us with our peer (start client).
robert_jw 0:b2805b6888dc 156 *
robert_jw 0:b2805b6888dc 157 * Set new state and send authenticate's.
robert_jw 0:b2805b6888dc 158 */
robert_jw 0:b2805b6888dc 159 void
robert_jw 0:b2805b6888dc 160 upap_authwithpeer(int unit, char *user, char *password)
robert_jw 0:b2805b6888dc 161 {
robert_jw 0:b2805b6888dc 162 upap_state *u = &upap[unit];
robert_jw 0:b2805b6888dc 163
robert_jw 0:b2805b6888dc 164 UPAPDEBUG(LOG_INFO, ("upap_authwithpeer: %d user=%s password=%s s=%d\n",
robert_jw 0:b2805b6888dc 165 unit, user, password, u->us_clientstate));
robert_jw 0:b2805b6888dc 166
robert_jw 0:b2805b6888dc 167 /* Save the username and password we're given */
robert_jw 0:b2805b6888dc 168 u->us_user = user;
robert_jw 0:b2805b6888dc 169 u->us_userlen = (int)strlen(user);
robert_jw 0:b2805b6888dc 170 u->us_passwd = password;
robert_jw 0:b2805b6888dc 171 u->us_passwdlen = (int)strlen(password);
robert_jw 0:b2805b6888dc 172
robert_jw 0:b2805b6888dc 173 u->us_transmits = 0;
robert_jw 0:b2805b6888dc 174
robert_jw 0:b2805b6888dc 175 /* Lower layer up yet? */
robert_jw 0:b2805b6888dc 176 if (u->us_clientstate == UPAPCS_INITIAL ||
robert_jw 0:b2805b6888dc 177 u->us_clientstate == UPAPCS_PENDING) {
robert_jw 0:b2805b6888dc 178 u->us_clientstate = UPAPCS_PENDING;
robert_jw 0:b2805b6888dc 179 return;
robert_jw 0:b2805b6888dc 180 }
robert_jw 0:b2805b6888dc 181
robert_jw 0:b2805b6888dc 182 upap_sauthreq(u); /* Start protocol */
robert_jw 0:b2805b6888dc 183 }
robert_jw 0:b2805b6888dc 184
robert_jw 0:b2805b6888dc 185
robert_jw 0:b2805b6888dc 186 /*
robert_jw 0:b2805b6888dc 187 * upap_authpeer - Authenticate our peer (start server).
robert_jw 0:b2805b6888dc 188 *
robert_jw 0:b2805b6888dc 189 * Set new state.
robert_jw 0:b2805b6888dc 190 */
robert_jw 0:b2805b6888dc 191 void
robert_jw 0:b2805b6888dc 192 upap_authpeer(int unit)
robert_jw 0:b2805b6888dc 193 {
robert_jw 0:b2805b6888dc 194 upap_state *u = &upap[unit];
robert_jw 0:b2805b6888dc 195
robert_jw 0:b2805b6888dc 196 /* Lower layer up yet? */
robert_jw 0:b2805b6888dc 197 if (u->us_serverstate == UPAPSS_INITIAL ||
robert_jw 0:b2805b6888dc 198 u->us_serverstate == UPAPSS_PENDING) {
robert_jw 0:b2805b6888dc 199 u->us_serverstate = UPAPSS_PENDING;
robert_jw 0:b2805b6888dc 200 return;
robert_jw 0:b2805b6888dc 201 }
robert_jw 0:b2805b6888dc 202
robert_jw 0:b2805b6888dc 203 u->us_serverstate = UPAPSS_LISTEN;
robert_jw 0:b2805b6888dc 204 if (u->us_reqtimeout > 0) {
robert_jw 0:b2805b6888dc 205 TIMEOUT(upap_reqtimeout, u, u->us_reqtimeout);
robert_jw 0:b2805b6888dc 206 }
robert_jw 0:b2805b6888dc 207 }
robert_jw 0:b2805b6888dc 208
robert_jw 0:b2805b6888dc 209 /*
robert_jw 0:b2805b6888dc 210 * upap_timeout - Retransmission timer for sending auth-reqs expired.
robert_jw 0:b2805b6888dc 211 */
robert_jw 0:b2805b6888dc 212 static void
robert_jw 0:b2805b6888dc 213 upap_timeout(void *arg)
robert_jw 0:b2805b6888dc 214 {
robert_jw 0:b2805b6888dc 215 upap_state *u = (upap_state *) arg;
robert_jw 0:b2805b6888dc 216
robert_jw 0:b2805b6888dc 217 UPAPDEBUG(LOG_INFO, ("upap_timeout: %d timeout %d expired s=%d\n",
robert_jw 0:b2805b6888dc 218 u->us_unit, u->us_timeouttime, u->us_clientstate));
robert_jw 0:b2805b6888dc 219
robert_jw 0:b2805b6888dc 220 if (u->us_clientstate != UPAPCS_AUTHREQ) {
robert_jw 0:b2805b6888dc 221 UPAPDEBUG(LOG_INFO, ("upap_timeout: not in AUTHREQ state!\n"));
robert_jw 0:b2805b6888dc 222 return;
robert_jw 0:b2805b6888dc 223 }
robert_jw 0:b2805b6888dc 224
robert_jw 0:b2805b6888dc 225 if (u->us_transmits >= u->us_maxtransmits) {
robert_jw 0:b2805b6888dc 226 /* give up in disgust */
robert_jw 0:b2805b6888dc 227 UPAPDEBUG(LOG_ERR, ("No response to PAP authenticate-requests\n"));
robert_jw 0:b2805b6888dc 228 u->us_clientstate = UPAPCS_BADAUTH;
robert_jw 0:b2805b6888dc 229 auth_withpeer_fail(u->us_unit, PPP_PAP);
robert_jw 0:b2805b6888dc 230 return;
robert_jw 0:b2805b6888dc 231 }
robert_jw 0:b2805b6888dc 232
robert_jw 0:b2805b6888dc 233 upap_sauthreq(u); /* Send Authenticate-Request and set upap timeout*/
robert_jw 0:b2805b6888dc 234 }
robert_jw 0:b2805b6888dc 235
robert_jw 0:b2805b6888dc 236
robert_jw 0:b2805b6888dc 237 /*
robert_jw 0:b2805b6888dc 238 * upap_reqtimeout - Give up waiting for the peer to send an auth-req.
robert_jw 0:b2805b6888dc 239 */
robert_jw 0:b2805b6888dc 240 static void
robert_jw 0:b2805b6888dc 241 upap_reqtimeout(void *arg)
robert_jw 0:b2805b6888dc 242 {
robert_jw 0:b2805b6888dc 243 upap_state *u = (upap_state *) arg;
robert_jw 0:b2805b6888dc 244
robert_jw 0:b2805b6888dc 245 if (u->us_serverstate != UPAPSS_LISTEN) {
robert_jw 0:b2805b6888dc 246 return; /* huh?? */
robert_jw 0:b2805b6888dc 247 }
robert_jw 0:b2805b6888dc 248
robert_jw 0:b2805b6888dc 249 auth_peer_fail(u->us_unit, PPP_PAP);
robert_jw 0:b2805b6888dc 250 u->us_serverstate = UPAPSS_BADAUTH;
robert_jw 0:b2805b6888dc 251 }
robert_jw 0:b2805b6888dc 252
robert_jw 0:b2805b6888dc 253
robert_jw 0:b2805b6888dc 254 /*
robert_jw 0:b2805b6888dc 255 * upap_lowerup - The lower layer is up.
robert_jw 0:b2805b6888dc 256 *
robert_jw 0:b2805b6888dc 257 * Start authenticating if pending.
robert_jw 0:b2805b6888dc 258 */
robert_jw 0:b2805b6888dc 259 static void
robert_jw 0:b2805b6888dc 260 upap_lowerup(int unit)
robert_jw 0:b2805b6888dc 261 {
robert_jw 0:b2805b6888dc 262 upap_state *u = &upap[unit];
robert_jw 0:b2805b6888dc 263
robert_jw 0:b2805b6888dc 264 UPAPDEBUG(LOG_INFO, ("upap_lowerup: init %d clientstate s=%d\n", unit, u->us_clientstate));
robert_jw 0:b2805b6888dc 265
robert_jw 0:b2805b6888dc 266 if (u->us_clientstate == UPAPCS_INITIAL) {
robert_jw 0:b2805b6888dc 267 u->us_clientstate = UPAPCS_CLOSED;
robert_jw 0:b2805b6888dc 268 } else if (u->us_clientstate == UPAPCS_PENDING) {
robert_jw 0:b2805b6888dc 269 upap_sauthreq(u); /* send an auth-request */
robert_jw 0:b2805b6888dc 270 /* now client state is UPAPCS__AUTHREQ */
robert_jw 0:b2805b6888dc 271 }
robert_jw 0:b2805b6888dc 272
robert_jw 0:b2805b6888dc 273 if (u->us_serverstate == UPAPSS_INITIAL) {
robert_jw 0:b2805b6888dc 274 u->us_serverstate = UPAPSS_CLOSED;
robert_jw 0:b2805b6888dc 275 } else if (u->us_serverstate == UPAPSS_PENDING) {
robert_jw 0:b2805b6888dc 276 u->us_serverstate = UPAPSS_LISTEN;
robert_jw 0:b2805b6888dc 277 if (u->us_reqtimeout > 0) {
robert_jw 0:b2805b6888dc 278 TIMEOUT(upap_reqtimeout, u, u->us_reqtimeout);
robert_jw 0:b2805b6888dc 279 }
robert_jw 0:b2805b6888dc 280 }
robert_jw 0:b2805b6888dc 281 }
robert_jw 0:b2805b6888dc 282
robert_jw 0:b2805b6888dc 283
robert_jw 0:b2805b6888dc 284 /*
robert_jw 0:b2805b6888dc 285 * upap_lowerdown - The lower layer is down.
robert_jw 0:b2805b6888dc 286 *
robert_jw 0:b2805b6888dc 287 * Cancel all timeouts.
robert_jw 0:b2805b6888dc 288 */
robert_jw 0:b2805b6888dc 289 static void
robert_jw 0:b2805b6888dc 290 upap_lowerdown(int unit)
robert_jw 0:b2805b6888dc 291 {
robert_jw 0:b2805b6888dc 292 upap_state *u = &upap[unit];
robert_jw 0:b2805b6888dc 293
robert_jw 0:b2805b6888dc 294 UPAPDEBUG(LOG_INFO, ("upap_lowerdown: %d s=%d\n", unit, u->us_clientstate));
robert_jw 0:b2805b6888dc 295
robert_jw 0:b2805b6888dc 296 if (u->us_clientstate == UPAPCS_AUTHREQ) { /* Timeout pending? */
robert_jw 0:b2805b6888dc 297 UNTIMEOUT(upap_timeout, u); /* Cancel timeout */
robert_jw 0:b2805b6888dc 298 }
robert_jw 0:b2805b6888dc 299 if (u->us_serverstate == UPAPSS_LISTEN && u->us_reqtimeout > 0) {
robert_jw 0:b2805b6888dc 300 UNTIMEOUT(upap_reqtimeout, u);
robert_jw 0:b2805b6888dc 301 }
robert_jw 0:b2805b6888dc 302
robert_jw 0:b2805b6888dc 303 u->us_clientstate = UPAPCS_INITIAL;
robert_jw 0:b2805b6888dc 304 u->us_serverstate = UPAPSS_INITIAL;
robert_jw 0:b2805b6888dc 305 }
robert_jw 0:b2805b6888dc 306
robert_jw 0:b2805b6888dc 307
robert_jw 0:b2805b6888dc 308 /*
robert_jw 0:b2805b6888dc 309 * upap_protrej - Peer doesn't speak this protocol.
robert_jw 0:b2805b6888dc 310 *
robert_jw 0:b2805b6888dc 311 * This shouldn't happen. In any case, pretend lower layer went down.
robert_jw 0:b2805b6888dc 312 */
robert_jw 0:b2805b6888dc 313 static void
robert_jw 0:b2805b6888dc 314 upap_protrej(int unit)
robert_jw 0:b2805b6888dc 315 {
robert_jw 0:b2805b6888dc 316 upap_state *u = &upap[unit];
robert_jw 0:b2805b6888dc 317
robert_jw 0:b2805b6888dc 318 if (u->us_clientstate == UPAPCS_AUTHREQ) {
robert_jw 0:b2805b6888dc 319 UPAPDEBUG(LOG_ERR, ("PAP authentication failed due to protocol-reject\n"));
robert_jw 0:b2805b6888dc 320 auth_withpeer_fail(unit, PPP_PAP);
robert_jw 0:b2805b6888dc 321 }
robert_jw 0:b2805b6888dc 322 if (u->us_serverstate == UPAPSS_LISTEN) {
robert_jw 0:b2805b6888dc 323 UPAPDEBUG(LOG_ERR, ("PAP authentication of peer failed (protocol-reject)\n"));
robert_jw 0:b2805b6888dc 324 auth_peer_fail(unit, PPP_PAP);
robert_jw 0:b2805b6888dc 325 }
robert_jw 0:b2805b6888dc 326 upap_lowerdown(unit);
robert_jw 0:b2805b6888dc 327 }
robert_jw 0:b2805b6888dc 328
robert_jw 0:b2805b6888dc 329
robert_jw 0:b2805b6888dc 330 /*
robert_jw 0:b2805b6888dc 331 * upap_input - Input UPAP packet.
robert_jw 0:b2805b6888dc 332 */
robert_jw 0:b2805b6888dc 333 static void
robert_jw 0:b2805b6888dc 334 upap_input(int unit, u_char *inpacket, int l)
robert_jw 0:b2805b6888dc 335 {
robert_jw 0:b2805b6888dc 336 upap_state *u = &upap[unit];
robert_jw 0:b2805b6888dc 337 u_char *inp;
robert_jw 0:b2805b6888dc 338 u_char code, id;
robert_jw 0:b2805b6888dc 339 int len;
robert_jw 0:b2805b6888dc 340
robert_jw 0:b2805b6888dc 341 /*
robert_jw 0:b2805b6888dc 342 * Parse header (code, id and length).
robert_jw 0:b2805b6888dc 343 * If packet too short, drop it.
robert_jw 0:b2805b6888dc 344 */
robert_jw 0:b2805b6888dc 345 inp = inpacket;
robert_jw 0:b2805b6888dc 346 if (l < (int)UPAP_HEADERLEN) {
robert_jw 0:b2805b6888dc 347 UPAPDEBUG(LOG_INFO, ("pap_input: rcvd short header.\n"));
robert_jw 0:b2805b6888dc 348 return;
robert_jw 0:b2805b6888dc 349 }
robert_jw 0:b2805b6888dc 350 GETCHAR(code, inp);
robert_jw 0:b2805b6888dc 351 GETCHAR(id, inp);
robert_jw 0:b2805b6888dc 352 GETSHORT(len, inp);
robert_jw 0:b2805b6888dc 353 if (len < (int)UPAP_HEADERLEN) {
robert_jw 0:b2805b6888dc 354 UPAPDEBUG(LOG_INFO, ("pap_input: rcvd illegal length.\n"));
robert_jw 0:b2805b6888dc 355 return;
robert_jw 0:b2805b6888dc 356 }
robert_jw 0:b2805b6888dc 357 if (len > l) {
robert_jw 0:b2805b6888dc 358 UPAPDEBUG(LOG_INFO, ("pap_input: rcvd short packet.\n"));
robert_jw 0:b2805b6888dc 359 return;
robert_jw 0:b2805b6888dc 360 }
robert_jw 0:b2805b6888dc 361 len -= UPAP_HEADERLEN;
robert_jw 0:b2805b6888dc 362
robert_jw 0:b2805b6888dc 363 /*
robert_jw 0:b2805b6888dc 364 * Action depends on code.
robert_jw 0:b2805b6888dc 365 */
robert_jw 0:b2805b6888dc 366 switch (code) {
robert_jw 0:b2805b6888dc 367 case UPAP_AUTHREQ:
robert_jw 0:b2805b6888dc 368 upap_rauthreq(u, inp, id, len);
robert_jw 0:b2805b6888dc 369 break;
robert_jw 0:b2805b6888dc 370
robert_jw 0:b2805b6888dc 371 case UPAP_AUTHACK:
robert_jw 0:b2805b6888dc 372 upap_rauthack(u, inp, id, len);
robert_jw 0:b2805b6888dc 373 break;
robert_jw 0:b2805b6888dc 374
robert_jw 0:b2805b6888dc 375 case UPAP_AUTHNAK:
robert_jw 0:b2805b6888dc 376 upap_rauthnak(u, inp, id, len);
robert_jw 0:b2805b6888dc 377 break;
robert_jw 0:b2805b6888dc 378
robert_jw 0:b2805b6888dc 379 default: /* XXX Need code reject */
robert_jw 0:b2805b6888dc 380 UPAPDEBUG(LOG_INFO, ("pap_input: UNHANDLED default: code: %d, id: %d, len: %d.\n", code, id, len));
robert_jw 0:b2805b6888dc 381 break;
robert_jw 0:b2805b6888dc 382 }
robert_jw 0:b2805b6888dc 383 }
robert_jw 0:b2805b6888dc 384
robert_jw 0:b2805b6888dc 385
robert_jw 0:b2805b6888dc 386 /*
robert_jw 0:b2805b6888dc 387 * upap_rauth - Receive Authenticate.
robert_jw 0:b2805b6888dc 388 */
robert_jw 0:b2805b6888dc 389 static void
robert_jw 0:b2805b6888dc 390 upap_rauthreq(upap_state *u, u_char *inp, u_char id, int len)
robert_jw 0:b2805b6888dc 391 {
robert_jw 0:b2805b6888dc 392 u_char ruserlen, rpasswdlen;
robert_jw 0:b2805b6888dc 393 char *ruser, *rpasswd;
robert_jw 0:b2805b6888dc 394 u_char retcode;
robert_jw 0:b2805b6888dc 395 char *msg;
robert_jw 0:b2805b6888dc 396 int msglen;
robert_jw 0:b2805b6888dc 397
robert_jw 0:b2805b6888dc 398 UPAPDEBUG(LOG_INFO, ("pap_rauth: Rcvd id %d.\n", id));
robert_jw 0:b2805b6888dc 399
robert_jw 0:b2805b6888dc 400 if (u->us_serverstate < UPAPSS_LISTEN) {
robert_jw 0:b2805b6888dc 401 return;
robert_jw 0:b2805b6888dc 402 }
robert_jw 0:b2805b6888dc 403
robert_jw 0:b2805b6888dc 404 /*
robert_jw 0:b2805b6888dc 405 * If we receive a duplicate authenticate-request, we are
robert_jw 0:b2805b6888dc 406 * supposed to return the same status as for the first request.
robert_jw 0:b2805b6888dc 407 */
robert_jw 0:b2805b6888dc 408 if (u->us_serverstate == UPAPSS_OPEN) {
robert_jw 0:b2805b6888dc 409 upap_sresp(u, UPAP_AUTHACK, id, "", 0); /* return auth-ack */
robert_jw 0:b2805b6888dc 410 return;
robert_jw 0:b2805b6888dc 411 }
robert_jw 0:b2805b6888dc 412 if (u->us_serverstate == UPAPSS_BADAUTH) {
robert_jw 0:b2805b6888dc 413 upap_sresp(u, UPAP_AUTHNAK, id, "", 0); /* return auth-nak */
robert_jw 0:b2805b6888dc 414 return;
robert_jw 0:b2805b6888dc 415 }
robert_jw 0:b2805b6888dc 416
robert_jw 0:b2805b6888dc 417 /*
robert_jw 0:b2805b6888dc 418 * Parse user/passwd.
robert_jw 0:b2805b6888dc 419 */
robert_jw 0:b2805b6888dc 420 if (len < (int)sizeof (u_char)) {
robert_jw 0:b2805b6888dc 421 UPAPDEBUG(LOG_INFO, ("pap_rauth: rcvd short packet.\n"));
robert_jw 0:b2805b6888dc 422 return;
robert_jw 0:b2805b6888dc 423 }
robert_jw 0:b2805b6888dc 424 GETCHAR(ruserlen, inp);
robert_jw 0:b2805b6888dc 425 len -= sizeof (u_char) + ruserlen + sizeof (u_char);
robert_jw 0:b2805b6888dc 426 if (len < 0) {
robert_jw 0:b2805b6888dc 427 UPAPDEBUG(LOG_INFO, ("pap_rauth: rcvd short packet.\n"));
robert_jw 0:b2805b6888dc 428 return;
robert_jw 0:b2805b6888dc 429 }
robert_jw 0:b2805b6888dc 430 ruser = (char *) inp;
robert_jw 0:b2805b6888dc 431 INCPTR(ruserlen, inp);
robert_jw 0:b2805b6888dc 432 GETCHAR(rpasswdlen, inp);
robert_jw 0:b2805b6888dc 433 if (len < rpasswdlen) {
robert_jw 0:b2805b6888dc 434 UPAPDEBUG(LOG_INFO, ("pap_rauth: rcvd short packet.\n"));
robert_jw 0:b2805b6888dc 435 return;
robert_jw 0:b2805b6888dc 436 }
robert_jw 0:b2805b6888dc 437 rpasswd = (char *) inp;
robert_jw 0:b2805b6888dc 438
robert_jw 0:b2805b6888dc 439 /*
robert_jw 0:b2805b6888dc 440 * Check the username and password given.
robert_jw 0:b2805b6888dc 441 */
robert_jw 0:b2805b6888dc 442 retcode = check_passwd(u->us_unit, ruser, ruserlen, rpasswd, rpasswdlen, &msg, &msglen);
robert_jw 0:b2805b6888dc 443 /* lwip: currently retcode is always UPAP_AUTHACK */
robert_jw 0:b2805b6888dc 444 BZERO(rpasswd, rpasswdlen);
robert_jw 0:b2805b6888dc 445
robert_jw 0:b2805b6888dc 446 upap_sresp(u, retcode, id, msg, msglen);
robert_jw 0:b2805b6888dc 447
robert_jw 0:b2805b6888dc 448 if (retcode == UPAP_AUTHACK) {
robert_jw 0:b2805b6888dc 449 u->us_serverstate = UPAPSS_OPEN;
robert_jw 0:b2805b6888dc 450 auth_peer_success(u->us_unit, PPP_PAP, ruser, ruserlen);
robert_jw 0:b2805b6888dc 451 } else {
robert_jw 0:b2805b6888dc 452 u->us_serverstate = UPAPSS_BADAUTH;
robert_jw 0:b2805b6888dc 453 auth_peer_fail(u->us_unit, PPP_PAP);
robert_jw 0:b2805b6888dc 454 }
robert_jw 0:b2805b6888dc 455
robert_jw 0:b2805b6888dc 456 if (u->us_reqtimeout > 0) {
robert_jw 0:b2805b6888dc 457 UNTIMEOUT(upap_reqtimeout, u);
robert_jw 0:b2805b6888dc 458 }
robert_jw 0:b2805b6888dc 459 }
robert_jw 0:b2805b6888dc 460
robert_jw 0:b2805b6888dc 461
robert_jw 0:b2805b6888dc 462 /*
robert_jw 0:b2805b6888dc 463 * upap_rauthack - Receive Authenticate-Ack.
robert_jw 0:b2805b6888dc 464 */
robert_jw 0:b2805b6888dc 465 static void
robert_jw 0:b2805b6888dc 466 upap_rauthack(upap_state *u, u_char *inp, int id, int len)
robert_jw 0:b2805b6888dc 467 {
robert_jw 0:b2805b6888dc 468 u_char msglen;
robert_jw 0:b2805b6888dc 469 char *msg;
robert_jw 0:b2805b6888dc 470
robert_jw 0:b2805b6888dc 471 LWIP_UNUSED_ARG(id);
robert_jw 0:b2805b6888dc 472
robert_jw 0:b2805b6888dc 473 UPAPDEBUG(LOG_INFO, ("pap_rauthack: Rcvd id %d s=%d\n", id, u->us_clientstate));
robert_jw 0:b2805b6888dc 474
robert_jw 0:b2805b6888dc 475 if (u->us_clientstate != UPAPCS_AUTHREQ) { /* XXX */
robert_jw 0:b2805b6888dc 476 UPAPDEBUG(LOG_INFO, ("pap_rauthack: us_clientstate != UPAPCS_AUTHREQ\n"));
robert_jw 0:b2805b6888dc 477 return;
robert_jw 0:b2805b6888dc 478 }
robert_jw 0:b2805b6888dc 479
robert_jw 0:b2805b6888dc 480 /*
robert_jw 0:b2805b6888dc 481 * Parse message.
robert_jw 0:b2805b6888dc 482 */
robert_jw 0:b2805b6888dc 483 if (len < (int)sizeof (u_char)) {
robert_jw 0:b2805b6888dc 484 UPAPDEBUG(LOG_INFO, ("pap_rauthack: ignoring missing msg-length.\n"));
robert_jw 0:b2805b6888dc 485 } else {
robert_jw 0:b2805b6888dc 486 GETCHAR(msglen, inp);
robert_jw 0:b2805b6888dc 487 if (msglen > 0) {
robert_jw 0:b2805b6888dc 488 len -= sizeof (u_char);
robert_jw 0:b2805b6888dc 489 if (len < msglen) {
robert_jw 0:b2805b6888dc 490 UPAPDEBUG(LOG_INFO, ("pap_rauthack: rcvd short packet.\n"));
robert_jw 0:b2805b6888dc 491 return;
robert_jw 0:b2805b6888dc 492 }
robert_jw 0:b2805b6888dc 493 msg = (char *) inp;
robert_jw 0:b2805b6888dc 494 PRINTMSG(msg, msglen);
robert_jw 0:b2805b6888dc 495 }
robert_jw 0:b2805b6888dc 496 }
robert_jw 0:b2805b6888dc 497 UNTIMEOUT(upap_timeout, u); /* Cancel timeout */
robert_jw 0:b2805b6888dc 498 u->us_clientstate = UPAPCS_OPEN;
robert_jw 0:b2805b6888dc 499
robert_jw 0:b2805b6888dc 500 auth_withpeer_success(u->us_unit, PPP_PAP);
robert_jw 0:b2805b6888dc 501 }
robert_jw 0:b2805b6888dc 502
robert_jw 0:b2805b6888dc 503
robert_jw 0:b2805b6888dc 504 /*
robert_jw 0:b2805b6888dc 505 * upap_rauthnak - Receive Authenticate-Nak.
robert_jw 0:b2805b6888dc 506 */
robert_jw 0:b2805b6888dc 507 static void
robert_jw 0:b2805b6888dc 508 upap_rauthnak(upap_state *u, u_char *inp, int id, int len)
robert_jw 0:b2805b6888dc 509 {
robert_jw 0:b2805b6888dc 510 u_char msglen;
robert_jw 0:b2805b6888dc 511 char *msg;
robert_jw 0:b2805b6888dc 512
robert_jw 0:b2805b6888dc 513 LWIP_UNUSED_ARG(id);
robert_jw 0:b2805b6888dc 514
robert_jw 0:b2805b6888dc 515 UPAPDEBUG(LOG_INFO, ("pap_rauthnak: Rcvd id %d s=%d\n", id, u->us_clientstate));
robert_jw 0:b2805b6888dc 516
robert_jw 0:b2805b6888dc 517 if (u->us_clientstate != UPAPCS_AUTHREQ) { /* XXX */
robert_jw 0:b2805b6888dc 518 return;
robert_jw 0:b2805b6888dc 519 }
robert_jw 0:b2805b6888dc 520
robert_jw 0:b2805b6888dc 521 /*
robert_jw 0:b2805b6888dc 522 * Parse message.
robert_jw 0:b2805b6888dc 523 */
robert_jw 0:b2805b6888dc 524 if (len < sizeof (u_char)) {
robert_jw 0:b2805b6888dc 525 UPAPDEBUG(LOG_INFO, ("pap_rauthnak: ignoring missing msg-length.\n"));
robert_jw 0:b2805b6888dc 526 } else {
robert_jw 0:b2805b6888dc 527 GETCHAR(msglen, inp);
robert_jw 0:b2805b6888dc 528 if(msglen > 0) {
robert_jw 0:b2805b6888dc 529 len -= sizeof (u_char);
robert_jw 0:b2805b6888dc 530 if (len < msglen) {
robert_jw 0:b2805b6888dc 531 UPAPDEBUG(LOG_INFO, ("pap_rauthnak: rcvd short packet.\n"));
robert_jw 0:b2805b6888dc 532 return;
robert_jw 0:b2805b6888dc 533 }
robert_jw 0:b2805b6888dc 534 msg = (char *) inp;
robert_jw 0:b2805b6888dc 535 PRINTMSG(msg, msglen);
robert_jw 0:b2805b6888dc 536 }
robert_jw 0:b2805b6888dc 537 }
robert_jw 0:b2805b6888dc 538
robert_jw 0:b2805b6888dc 539 u->us_clientstate = UPAPCS_BADAUTH;
robert_jw 0:b2805b6888dc 540
robert_jw 0:b2805b6888dc 541 UPAPDEBUG(LOG_ERR, ("PAP authentication failed\n"));
robert_jw 0:b2805b6888dc 542 auth_withpeer_fail(u->us_unit, PPP_PAP);
robert_jw 0:b2805b6888dc 543 }
robert_jw 0:b2805b6888dc 544
robert_jw 0:b2805b6888dc 545
robert_jw 0:b2805b6888dc 546 /*
robert_jw 0:b2805b6888dc 547 * upap_sauthreq - Send an Authenticate-Request.
robert_jw 0:b2805b6888dc 548 */
robert_jw 0:b2805b6888dc 549 static void
robert_jw 0:b2805b6888dc 550 upap_sauthreq(upap_state *u)
robert_jw 0:b2805b6888dc 551 {
robert_jw 0:b2805b6888dc 552 u_char *outp;
robert_jw 0:b2805b6888dc 553 int outlen;
robert_jw 0:b2805b6888dc 554
robert_jw 0:b2805b6888dc 555 outlen = UPAP_HEADERLEN + 2 * sizeof (u_char)
robert_jw 0:b2805b6888dc 556 + u->us_userlen + u->us_passwdlen;
robert_jw 0:b2805b6888dc 557 outp = outpacket_buf[u->us_unit];
robert_jw 0:b2805b6888dc 558
robert_jw 0:b2805b6888dc 559 MAKEHEADER(outp, PPP_PAP);
robert_jw 0:b2805b6888dc 560
robert_jw 0:b2805b6888dc 561 PUTCHAR(UPAP_AUTHREQ, outp);
robert_jw 0:b2805b6888dc 562 PUTCHAR(++u->us_id, outp);
robert_jw 0:b2805b6888dc 563 PUTSHORT(outlen, outp);
robert_jw 0:b2805b6888dc 564 PUTCHAR(u->us_userlen, outp);
robert_jw 0:b2805b6888dc 565 BCOPY(u->us_user, outp, u->us_userlen);
robert_jw 0:b2805b6888dc 566 INCPTR(u->us_userlen, outp);
robert_jw 0:b2805b6888dc 567 PUTCHAR(u->us_passwdlen, outp);
robert_jw 0:b2805b6888dc 568 BCOPY(u->us_passwd, outp, u->us_passwdlen);
robert_jw 0:b2805b6888dc 569
robert_jw 0:b2805b6888dc 570 pppWrite(u->us_unit, outpacket_buf[u->us_unit], outlen + PPP_HDRLEN);
robert_jw 0:b2805b6888dc 571
robert_jw 0:b2805b6888dc 572 UPAPDEBUG(LOG_INFO, ("pap_sauth: Sent id %d\n", u->us_id));
robert_jw 0:b2805b6888dc 573
robert_jw 0:b2805b6888dc 574 TIMEOUT(upap_timeout, u, u->us_timeouttime);
robert_jw 0:b2805b6888dc 575 ++u->us_transmits;
robert_jw 0:b2805b6888dc 576 u->us_clientstate = UPAPCS_AUTHREQ;
robert_jw 0:b2805b6888dc 577 }
robert_jw 0:b2805b6888dc 578
robert_jw 0:b2805b6888dc 579
robert_jw 0:b2805b6888dc 580 /*
robert_jw 0:b2805b6888dc 581 * upap_sresp - Send a response (ack or nak).
robert_jw 0:b2805b6888dc 582 */
robert_jw 0:b2805b6888dc 583 static void
robert_jw 0:b2805b6888dc 584 upap_sresp(upap_state *u, u_char code, u_char id, char *msg, int msglen)
robert_jw 0:b2805b6888dc 585 {
robert_jw 0:b2805b6888dc 586 u_char *outp;
robert_jw 0:b2805b6888dc 587 int outlen;
robert_jw 0:b2805b6888dc 588
robert_jw 0:b2805b6888dc 589 outlen = UPAP_HEADERLEN + sizeof (u_char) + msglen;
robert_jw 0:b2805b6888dc 590 outp = outpacket_buf[u->us_unit];
robert_jw 0:b2805b6888dc 591 MAKEHEADER(outp, PPP_PAP);
robert_jw 0:b2805b6888dc 592
robert_jw 0:b2805b6888dc 593 PUTCHAR(code, outp);
robert_jw 0:b2805b6888dc 594 PUTCHAR(id, outp);
robert_jw 0:b2805b6888dc 595 PUTSHORT(outlen, outp);
robert_jw 0:b2805b6888dc 596 PUTCHAR(msglen, outp);
robert_jw 0:b2805b6888dc 597 BCOPY(msg, outp, msglen);
robert_jw 0:b2805b6888dc 598 pppWrite(u->us_unit, outpacket_buf[u->us_unit], outlen + PPP_HDRLEN);
robert_jw 0:b2805b6888dc 599
robert_jw 0:b2805b6888dc 600 UPAPDEBUG(LOG_INFO, ("pap_sresp: Sent code %d, id %d s=%d\n", code, id, u->us_clientstate));
robert_jw 0:b2805b6888dc 601 }
robert_jw 0:b2805b6888dc 602
robert_jw 0:b2805b6888dc 603 #if PPP_ADDITIONAL_CALLBACKS
robert_jw 0:b2805b6888dc 604 static char *upap_codenames[] = {
robert_jw 0:b2805b6888dc 605 "AuthReq", "AuthAck", "AuthNak"
robert_jw 0:b2805b6888dc 606 };
robert_jw 0:b2805b6888dc 607
robert_jw 0:b2805b6888dc 608 /*
robert_jw 0:b2805b6888dc 609 * upap_printpkt - print the contents of a PAP packet.
robert_jw 0:b2805b6888dc 610 */
robert_jw 0:b2805b6888dc 611 static int upap_printpkt(
robert_jw 0:b2805b6888dc 612 u_char *p,
robert_jw 0:b2805b6888dc 613 int plen,
robert_jw 0:b2805b6888dc 614 void (*printer) (void *, char *, ...),
robert_jw 0:b2805b6888dc 615 void *arg
robert_jw 0:b2805b6888dc 616 )
robert_jw 0:b2805b6888dc 617 {
robert_jw 0:b2805b6888dc 618 LWIP_UNUSED_ARG(p);
robert_jw 0:b2805b6888dc 619 LWIP_UNUSED_ARG(plen);
robert_jw 0:b2805b6888dc 620 LWIP_UNUSED_ARG(printer);
robert_jw 0:b2805b6888dc 621 LWIP_UNUSED_ARG(arg);
robert_jw 0:b2805b6888dc 622 return 0;
robert_jw 0:b2805b6888dc 623 }
robert_jw 0:b2805b6888dc 624 #endif /* PPP_ADDITIONAL_CALLBACKS */
robert_jw 0:b2805b6888dc 625
robert_jw 0:b2805b6888dc 626 #endif /* PAP_SUPPORT */
robert_jw 0:b2805b6888dc 627
robert_jw 0:b2805b6888dc 628 #endif /* PPP_SUPPORT */