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/*
 * upap.c - User/Password Authentication Protocol.
 *
 * Copyright (c) 1989 Carnegie Mellon University.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by Carnegie Mellon University.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */
 
#ifndef lint
/* static char rcsid[] = "$Id: upap.c,v 1.2 2001-09-27 12:01:57 chris Exp $"; */
#endif
 
/*
 * TODO:
 */
 
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/time.h>
#include <syslog.h>
 
#include "pppd.h"
#include "upap.h"
#define print_string(user, ulen, printer, arg)
 
/*
 * Protocol entry points.
 */
static void upap_init __P((int));
static void upap_lowerup __P((int));
static void upap_lowerdown __P((int));
static void upap_input __P((int, u_char *, int));
static void upap_protrej __P((int));
static int  upap_printpkt __P((u_char *, int,
                               void (*) __P((void *, char *, ...)), void *));
 
struct protent pap_protent = {
    PPP_PAP,
    upap_init,
    upap_input,
    upap_protrej,
    upap_lowerup,
    upap_lowerdown,
    NULL,
    NULL,
    upap_printpkt,
    NULL,
    1,
    "PAP",
    NULL,
    NULL,
    NULL
};
 
upap_state upap[NUM_PPP];               /* UPAP state; one for each unit */
 
static void upap_timeout __P((void *));
static void upap_reqtimeout __P((void *));
static void upap_rauthreq __P((upap_state *, u_char *, int, int));
static void upap_rauthack __P((upap_state *, u_char *, int, int));
static void upap_rauthnak __P((upap_state *, u_char *, int, int));
static void upap_sauthreq __P((upap_state *));
static void upap_sresp __P((upap_state *, int, int, char *, int));
 
 
/*
 * upap_init - Initialize a UPAP unit.
 */
static void
upap_init(unit)
    int unit;
{
    upap_state *u = &upap[unit];
 
    u->us_unit = unit;
    u->us_user = NULL;
    u->us_userlen = 0;
    u->us_passwd = NULL;
    u->us_passwdlen = 0;
    u->us_clientstate = UPAPCS_INITIAL;
    u->us_serverstate = UPAPSS_INITIAL;
    u->us_id = 0;
    u->us_timeouttime = UPAP_DEFTIMEOUT;
    u->us_maxtransmits = 10;
    u->us_reqtimeout = UPAP_DEFREQTIME;
}
 
 
/*
 * upap_authwithpeer - Authenticate us with our peer (start client).
 *
 * Set new state and send authenticate's.
 */
void
upap_authwithpeer(unit, user, password)
    int unit;
    char *user, *password;
{
    upap_state *u = &upap[unit];
 
    /* Save the username and password we're given */
    u->us_user = user;
    u->us_userlen = strlen(user);
    u->us_passwd = password;
    u->us_passwdlen = strlen(password);
    u->us_transmits = 0;
 
    /* Lower layer up yet? */
    if (u->us_clientstate == UPAPCS_INITIAL ||
        u->us_clientstate == UPAPCS_PENDING) {
        u->us_clientstate = UPAPCS_PENDING;
        return;
    }
 
    upap_sauthreq(u);                   /* Start protocol */
}
 
 
/*
 * upap_authpeer - Authenticate our peer (start server).
 *
 * Set new state.
 */
void
upap_authpeer(unit)
    int unit;
{
    upap_state *u = &upap[unit];
 
    /* Lower layer up yet? */
    if (u->us_serverstate == UPAPSS_INITIAL ||
        u->us_serverstate == UPAPSS_PENDING) {
        u->us_serverstate = UPAPSS_PENDING;
        return;
    }
 
    u->us_serverstate = UPAPSS_LISTEN;
    if (u->us_reqtimeout > 0)
        TIMEOUT(upap_reqtimeout, u, u->us_reqtimeout);
}
 
 
/*
 * upap_timeout - Retransmission timer for sending auth-reqs expired.
 */
static void
upap_timeout(arg)
    void *arg;
{
    upap_state *u = (upap_state *) arg;
 
    if (u->us_clientstate != UPAPCS_AUTHREQ)
        return;
 
    if (u->us_transmits >= u->us_maxtransmits) {
        /* give up in disgust */
        syslog(LOG_ERR, "No response to PAP authenticate-requests");
        u->us_clientstate = UPAPCS_BADAUTH;
        auth_withpeer_fail(u->us_unit, PPP_PAP);
        return;
    }
 
    upap_sauthreq(u);           /* Send Authenticate-Request */
}
 
 
/*
 * upap_reqtimeout - Give up waiting for the peer to send an auth-req.
 */
static void
upap_reqtimeout(arg)
    void *arg;
{
    upap_state *u = (upap_state *) arg;
 
    if (u->us_serverstate != UPAPSS_LISTEN)
        return;                 /* huh?? */
 
    auth_peer_fail(u->us_unit, PPP_PAP);
    u->us_serverstate = UPAPSS_BADAUTH;
}
 
 
/*
 * upap_lowerup - The lower layer is up.
 *
 * Start authenticating if pending.
 */
static void
upap_lowerup(unit)
    int unit;
{
    upap_state *u = &upap[unit];
 
    if (u->us_clientstate == UPAPCS_INITIAL)
        u->us_clientstate = UPAPCS_CLOSED;
    else if (u->us_clientstate == UPAPCS_PENDING) {
        upap_sauthreq(u);       /* send an auth-request */
    }
 
    if (u->us_serverstate == UPAPSS_INITIAL)
        u->us_serverstate = UPAPSS_CLOSED;
    else if (u->us_serverstate == UPAPSS_PENDING) {
        u->us_serverstate = UPAPSS_LISTEN;
        if (u->us_reqtimeout > 0)
            TIMEOUT(upap_reqtimeout, u, u->us_reqtimeout);
    }
}
 
 
/*
 * upap_lowerdown - The lower layer is down.
 *
 * Cancel all timeouts.
 */
static void
upap_lowerdown(unit)
    int unit;
{
    upap_state *u = &upap[unit];
 
    if (u->us_clientstate == UPAPCS_AUTHREQ)    /* Timeout pending? */
        UNTIMEOUT(upap_timeout, u);             /* Cancel timeout */
    if (u->us_serverstate == UPAPSS_LISTEN && u->us_reqtimeout > 0)
        UNTIMEOUT(upap_reqtimeout, u);
 
    u->us_clientstate = UPAPCS_INITIAL;
    u->us_serverstate = UPAPSS_INITIAL;
}
 
 
/*
 * upap_protrej - Peer doesn't speak this protocol.
 *
 * This shouldn't happen.  In any case, pretend lower layer went down.
 */
static void
upap_protrej(unit)
    int unit;
{
    upap_state *u = &upap[unit];
 
    if (u->us_clientstate == UPAPCS_AUTHREQ) {
        syslog(LOG_ERR, "PAP authentication failed due to protocol-reject");
        auth_withpeer_fail(unit, PPP_PAP);
    }
    if (u->us_serverstate == UPAPSS_LISTEN) {
        syslog(LOG_ERR, "PAP authentication of peer failed (protocol-reject)");
        auth_peer_fail(unit, PPP_PAP);
    }
    upap_lowerdown(unit);
}
 
 
/*
 * upap_input - Input UPAP packet.
 */
static void
upap_input(unit, inpacket, l)
    int unit;
    u_char *inpacket;
    int l;
{
    upap_state *u = &upap[unit];
    u_char *inp;
    u_char code, id;
    int len;
 
    /*
     * Parse header (code, id and length).
     * If packet too short, drop it.
     */
    inp = inpacket;
    if (l < UPAP_HEADERLEN) {
        UPAPDEBUG((LOG_INFO, "pap_input: rcvd short header."));
        return;
    }
    GETCHAR(code, inp);
    GETCHAR(id, inp);
    GETSHORT(len, inp);
    if (len < UPAP_HEADERLEN) {
        UPAPDEBUG((LOG_INFO, "pap_input: rcvd illegal length."));
        return;
    }
    if (len > l) {
        UPAPDEBUG((LOG_INFO, "pap_input: rcvd short packet."));
        return;
    }
    len -= UPAP_HEADERLEN;
 
    /*
     * Action depends on code.
     */
    switch (code) {
    case UPAP_AUTHREQ:
        upap_rauthreq(u, inp, id, len);
        break;
 
    case UPAP_AUTHACK:
        upap_rauthack(u, inp, id, len);
        break;
 
    case UPAP_AUTHNAK:
        upap_rauthnak(u, inp, id, len);
        break;
 
    default:                            /* XXX Need code reject */
        break;
    }
}
 
 
/*
 * upap_rauth - Receive Authenticate.
 */
static void
upap_rauthreq(u, inp, id, len)
    upap_state *u;
    u_char *inp;
    int id;
    int len;
{
    u_char ruserlen, rpasswdlen;
    char *ruser, *rpasswd;
    int retcode;
    char *msg;
    int msglen;
 
    UPAPDEBUG((LOG_INFO, "pap_rauth: Rcvd id %d.", id));
 
    if (u->us_serverstate < UPAPSS_LISTEN)
        return;
 
    /*
     * If we receive a duplicate authenticate-request, we are
     * supposed to return the same status as for the first request.
     */
    if (u->us_serverstate == UPAPSS_OPEN) {
        upap_sresp(u, UPAP_AUTHACK, id, "", 0);  /* return auth-ack */
        return;
    }
    if (u->us_serverstate == UPAPSS_BADAUTH) {
        upap_sresp(u, UPAP_AUTHNAK, id, "", 0);  /* return auth-nak */
        return;
    }
 
    /*
     * Parse user/passwd.
     */
    if (len < sizeof (u_char)) {
        UPAPDEBUG((LOG_INFO, "pap_rauth: rcvd short packet."));
        return;
    }
    GETCHAR(ruserlen, inp);
    len -= sizeof (u_char) + ruserlen + sizeof (u_char);
    if (len < 0) {
        UPAPDEBUG((LOG_INFO, "pap_rauth: rcvd short packet."));
        return;
    }
    ruser = (char *) inp;
    INCPTR(ruserlen, inp);
    GETCHAR(rpasswdlen, inp);
    if (len < rpasswdlen) {
        UPAPDEBUG((LOG_INFO, "pap_rauth: rcvd short packet."));
        return;
    }
    rpasswd = (char *) inp;
 
    /*
     * Check the username and password given.
     */
    retcode = check_passwd(u->us_unit, ruser, ruserlen, rpasswd,
                           rpasswdlen, &msg, &msglen);
    BZERO(rpasswd, rpasswdlen);
 
    upap_sresp(u, retcode, id, msg, msglen);
 
    if (retcode == UPAP_AUTHACK) {
        u->us_serverstate = UPAPSS_OPEN;
        auth_peer_success(u->us_unit, PPP_PAP, ruser, ruserlen);
    } else {
        u->us_serverstate = UPAPSS_BADAUTH;
        auth_peer_fail(u->us_unit, PPP_PAP);
    }
 
    if (u->us_reqtimeout > 0)
        UNTIMEOUT(upap_reqtimeout, u);
}
 
 
/*
 * upap_rauthack - Receive Authenticate-Ack.
 */
static void
upap_rauthack(u, inp, id, len)
    upap_state *u;
    u_char *inp;
    int id;
    int len;
{
    u_char msglen;
    char *msg;
 
    UPAPDEBUG((LOG_INFO, "pap_rauthack: Rcvd id %d.", id));
    if (u->us_clientstate != UPAPCS_AUTHREQ) /* XXX */
        return;
 
    /*
     * Parse message.
     */
    if (len < sizeof (u_char)) {
        UPAPDEBUG((LOG_INFO, "pap_rauthack: rcvd short packet."));
        return;
    }
    GETCHAR(msglen, inp);
    len -= sizeof (u_char);
    if (len < msglen) {
        UPAPDEBUG((LOG_INFO, "pap_rauthack: rcvd short packet."));
        return;
    }
    msg = (char *) inp;
    PRINTMSG(msg, msglen);
 
    u->us_clientstate = UPAPCS_OPEN;
 
    auth_withpeer_success(u->us_unit, PPP_PAP);
}
 
 
/*
 * upap_rauthnak - Receive Authenticate-Nakk.
 */
static void
upap_rauthnak(u, inp, id, len)
    upap_state *u;
    u_char *inp;
    int id;
    int len;
{
    u_char msglen;
    char *msg;
 
    UPAPDEBUG((LOG_INFO, "pap_rauthnak: Rcvd id %d.", id));
    if (u->us_clientstate != UPAPCS_AUTHREQ) /* XXX */
        return;
 
    /*
     * Parse message.
     */
    if (len < sizeof (u_char)) {
        UPAPDEBUG((LOG_INFO, "pap_rauthnak: rcvd short packet."));
        return;
    }
    GETCHAR(msglen, inp);
    len -= sizeof (u_char);
    if (len < msglen) {
        UPAPDEBUG((LOG_INFO, "pap_rauthnak: rcvd short packet."));
        return;
    }
    msg = (char *) inp;
    PRINTMSG(msg, msglen);
 
    u->us_clientstate = UPAPCS_BADAUTH;
 
    syslog(LOG_ERR, "PAP authentication failed");
    auth_withpeer_fail(u->us_unit, PPP_PAP);
}
 
 
/*
 * upap_sauthreq - Send an Authenticate-Request.
 */
static void
upap_sauthreq(u)
    upap_state *u;
{
    u_char *outp;
    int outlen;
 
    outlen = UPAP_HEADERLEN + 2 * sizeof (u_char) +
        u->us_userlen + u->us_passwdlen;
    outp = outpacket_buf;
 
    MAKEHEADER(outp, PPP_PAP);
 
    PUTCHAR(UPAP_AUTHREQ, outp);
    PUTCHAR(++u->us_id, outp);
    PUTSHORT(outlen, outp);
    PUTCHAR(u->us_userlen, outp);
    BCOPY(u->us_user, outp, u->us_userlen);
    INCPTR(u->us_userlen, outp);
    PUTCHAR(u->us_passwdlen, outp);
    BCOPY(u->us_passwd, outp, u->us_passwdlen);
 
    output(u->us_unit, outpacket_buf, outlen + PPP_HDRLEN);
 
    UPAPDEBUG((LOG_INFO, "pap_sauth: Sent id %d.", u->us_id));
 
    TIMEOUT(upap_timeout, u, u->us_timeouttime);
    ++u->us_transmits;
    u->us_clientstate = UPAPCS_AUTHREQ;
}
 
 
/*
 * upap_sresp - Send a response (ack or nak).
 */
static void
upap_sresp(u, code, id, msg, msglen)
    upap_state *u;
    u_char code, id;
    char *msg;
    int msglen;
{
    u_char *outp;
    int outlen;
 
    outlen = UPAP_HEADERLEN + sizeof (u_char) + msglen;
    outp = outpacket_buf;
    MAKEHEADER(outp, PPP_PAP);
 
    PUTCHAR(code, outp);
    PUTCHAR(id, outp);
    PUTSHORT(outlen, outp);
    PUTCHAR(msglen, outp);
    BCOPY(msg, outp, msglen);
    output(u->us_unit, outpacket_buf, outlen + PPP_HDRLEN);
 
    UPAPDEBUG((LOG_INFO, "pap_sresp: Sent code %d, id %d.", code, id));
}
 
/*
 * upap_printpkt - print the contents of a PAP packet.
 */
static char *upap_codenames[] = {
    "AuthReq", "AuthAck", "AuthNak"
};
 
static int
upap_printpkt(p, plen, printer, arg)
    u_char *p;
    int plen;
    void (*printer) __P((void *, char *, ...));
    void *arg;
{
    int code, id, len;
    int mlen, ulen, wlen;
    char *user, *pwd, *msg;
    u_char *pstart;
 
    if (plen < UPAP_HEADERLEN)
        return 0;
    pstart = p;
    GETCHAR(code, p);
    GETCHAR(id, p);
    GETSHORT(len, p);
    if (len < UPAP_HEADERLEN || len > plen)
        return 0;
 
    if (code >= 1 && code <= sizeof(upap_codenames) / sizeof(char *))
        printer(arg, " %s", upap_codenames[code-1]);
    else
        printer(arg, " code=0x%x", code);
    printer(arg, " id=0x%x", id);
    len -= UPAP_HEADERLEN;
    switch (code) {
    case UPAP_AUTHREQ:
        if (len < 1)
            break;
        ulen = p[0];
        if (len < ulen + 2)
            break;
        wlen = p[ulen + 1];
        if (len < ulen + wlen + 2)
            break;
        user = (char *) (p + 1);
        pwd = (char *) (p + ulen + 2);
        p += ulen + wlen + 2;
        len -= ulen + wlen + 2;
        printer(arg, " user=");
        print_string(user, ulen, printer, arg);
        printer(arg, " password=");
        print_string(pwd, wlen, printer, arg);
        break;
    case UPAP_AUTHACK:
    case UPAP_AUTHNAK:
        if (len < 1)
            break;
        mlen = p[0];
        if (len < mlen + 1)
            break;
        msg = (char *) (p + 1);
        p += mlen + 1;
        len -= mlen + 1;
        printer(arg, " ");
        print_string(msg, mlen, printer, arg);
        break;
    }
 
    /* print the rest of the bytes in the packet */
    for (; len > 0; --len) {
        GETCHAR(code, p);
        printer(arg, " %.2x", code);
    }
 
    return p - pstart;
}

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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [pppd/] [upap.c] - Blame information for rev 773

Line No.	Rev	Author	Line
1	30	unneback	`/*`
2			`* upap.c - User/Password Authentication Protocol.`
3			`*`
4			`* Copyright (c) 1989 Carnegie Mellon University.`
5			`* All rights reserved.`
6			`*`
7			`* Redistribution and use in source and binary forms are permitted`
8			`* provided that the above copyright notice and this paragraph are`
9			`* duplicated in all such forms and that any documentation,`
10			`* advertising materials, and other materials related to such`
11			`* distribution and use acknowledge that the software was developed`
12			`* by Carnegie Mellon University. The name of the`
13			`* University may not be used to endorse or promote products derived`
14			`* from this software without specific prior written permission.`
15			* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16			`* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED`
17			`* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.`
18			`*/`
19
20			`#ifndef lint`
21			`/* static char rcsid[] = "$Id: upap.c,v 1.2 2001-09-27 12:01:57 chris Exp $"; */`
22			`#endif`
23
24			`/*`
25			`* TODO:`
26			`*/`
27
28			`#include <stdio.h>`
29			`#include <string.h>`
30			`#include <sys/types.h>`
31			`#include <sys/time.h>`
32			`#include <syslog.h>`
33
34			`#include "pppd.h"`
35			`#include "upap.h"`
36			`#define print_string(user, ulen, printer, arg)`
37
38			`/*`
39			`* Protocol entry points.`
40			`*/`
41			`static void upap_init __P((int));`
42			`static void upap_lowerup __P((int));`
43			`static void upap_lowerdown __P((int));`
44			`static void upap_input __P((int, u_char *, int));`
45			`static void upap_protrej __P((int));`
46			`static int upap_printpkt __P((u_char *, int,`
47			`void () __P((void , char , ...)), void ));`
48
49			`struct protent pap_protent = {`
50			`PPP_PAP,`
51			`upap_init,`
52			`upap_input,`
53			`upap_protrej,`
54			`upap_lowerup,`
55			`upap_lowerdown,`
56			`NULL,`
57			`NULL,`
58			`upap_printpkt,`
59			`NULL,`
60			`1,`
61			`"PAP",`
62			`NULL,`
63			`NULL,`
64			`NULL`
65			`};`
66
67			`upap_state upap[NUM_PPP]; /* UPAP state; one for each unit */`
68
69			`static void upap_timeout __P((void *));`
70			`static void upap_reqtimeout __P((void *));`
71			`static void upap_rauthreq __P((upap_state , u_char , int, int));`
72			`static void upap_rauthack __P((upap_state , u_char , int, int));`
73			`static void upap_rauthnak __P((upap_state , u_char , int, int));`
74			`static void upap_sauthreq __P((upap_state *));`
75			`static void upap_sresp __P((upap_state , int, int, char , int));`
76
77
78			`/*`
79			`* upap_init - Initialize a UPAP unit.`
80			`*/`
81			`static void`
82			`upap_init(unit)`
83			`int unit;`
84			`{`
85			`upap_state *u = &upap[unit];`
86
87			`u->us_unit = unit;`
88			`u->us_user = NULL;`
89			`u->us_userlen = 0;`
90			`u->us_passwd = NULL;`
91			`u->us_passwdlen = 0;`
92			`u->us_clientstate = UPAPCS_INITIAL;`
93			`u->us_serverstate = UPAPSS_INITIAL;`
94			`u->us_id = 0;`
95			`u->us_timeouttime = UPAP_DEFTIMEOUT;`
96			`u->us_maxtransmits = 10;`
97			`u->us_reqtimeout = UPAP_DEFREQTIME;`
98			`}`
99
100
101			`/*`
102			`* upap_authwithpeer - Authenticate us with our peer (start client).`
103			`*`
104			`* Set new state and send authenticate's.`
105			`*/`
106			`void`
107			`upap_authwithpeer(unit, user, password)`
108			`int unit;`
109			`char user, password;`
110			`{`
111			`upap_state *u = &upap[unit];`
112
113			`/* Save the username and password we're given */`
114			`u->us_user = user;`
115			`u->us_userlen = strlen(user);`
116			`u->us_passwd = password;`
117			`u->us_passwdlen = strlen(password);`
118			`u->us_transmits = 0;`
119
120			`/* Lower layer up yet? */`
121			`if (u->us_clientstate == UPAPCS_INITIAL \|\|`
122			`u->us_clientstate == UPAPCS_PENDING) {`
123			`u->us_clientstate = UPAPCS_PENDING;`
124			`return;`
125			`}`
126
127			`upap_sauthreq(u); /* Start protocol */`
128			`}`
129
130
131			`/*`
132			`* upap_authpeer - Authenticate our peer (start server).`
133			`*`
134			`* Set new state.`
135			`*/`
136			`void`
137			`upap_authpeer(unit)`
138			`int unit;`
139			`{`
140			`upap_state *u = &upap[unit];`
141
142			`/* Lower layer up yet? */`
143			`if (u->us_serverstate == UPAPSS_INITIAL \|\|`
144			`u->us_serverstate == UPAPSS_PENDING) {`
145			`u->us_serverstate = UPAPSS_PENDING;`
146			`return;`
147			`}`
148
149			`u->us_serverstate = UPAPSS_LISTEN;`
150			`if (u->us_reqtimeout > 0)`
151			`TIMEOUT(upap_reqtimeout, u, u->us_reqtimeout);`
152			`}`
153
154
155			`/*`
156			`* upap_timeout - Retransmission timer for sending auth-reqs expired.`
157			`*/`
158			`static void`
159			`upap_timeout(arg)`
160			`void *arg;`
161			`{`
162			`upap_state u = (upap_state ) arg;`
163
164			`if (u->us_clientstate != UPAPCS_AUTHREQ)`
165			`return;`
166
167			`if (u->us_transmits >= u->us_maxtransmits) {`
168			`/* give up in disgust */`
169			`syslog(LOG_ERR, "No response to PAP authenticate-requests");`
170			`u->us_clientstate = UPAPCS_BADAUTH;`
171			`auth_withpeer_fail(u->us_unit, PPP_PAP);`
172			`return;`
173			`}`
174
175			`upap_sauthreq(u); /* Send Authenticate-Request */`
176			`}`
177
178
179			`/*`
180			`* upap_reqtimeout - Give up waiting for the peer to send an auth-req.`
181			`*/`
182			`static void`
183			`upap_reqtimeout(arg)`
184			`void *arg;`
185			`{`
186			`upap_state u = (upap_state ) arg;`
187
188			`if (u->us_serverstate != UPAPSS_LISTEN)`
189			`return; /* huh?? */`
190
191			`auth_peer_fail(u->us_unit, PPP_PAP);`
192			`u->us_serverstate = UPAPSS_BADAUTH;`
193			`}`
194
195
196			`/*`
197			`* upap_lowerup - The lower layer is up.`
198			`*`
199			`* Start authenticating if pending.`
200			`*/`
201			`static void`
202			`upap_lowerup(unit)`
203			`int unit;`
204			`{`
205			`upap_state *u = &upap[unit];`
206
207			`if (u->us_clientstate == UPAPCS_INITIAL)`
208			`u->us_clientstate = UPAPCS_CLOSED;`
209			`else if (u->us_clientstate == UPAPCS_PENDING) {`
210			`upap_sauthreq(u); /* send an auth-request */`
211			`}`
212
213			`if (u->us_serverstate == UPAPSS_INITIAL)`
214			`u->us_serverstate = UPAPSS_CLOSED;`
215			`else if (u->us_serverstate == UPAPSS_PENDING) {`
216			`u->us_serverstate = UPAPSS_LISTEN;`
217			`if (u->us_reqtimeout > 0)`
218			`TIMEOUT(upap_reqtimeout, u, u->us_reqtimeout);`
219			`}`
220			`}`
221
222
223			`/*`
224			`* upap_lowerdown - The lower layer is down.`
225			`*`
226			`* Cancel all timeouts.`
227			`*/`
228			`static void`
229			`upap_lowerdown(unit)`
230			`int unit;`
231			`{`
232			`upap_state *u = &upap[unit];`
233
234			`if (u->us_clientstate == UPAPCS_AUTHREQ) /* Timeout pending? */`
235			`UNTIMEOUT(upap_timeout, u); /* Cancel timeout */`
236			`if (u->us_serverstate == UPAPSS_LISTEN && u->us_reqtimeout > 0)`
237			`UNTIMEOUT(upap_reqtimeout, u);`
238
239			`u->us_clientstate = UPAPCS_INITIAL;`
240			`u->us_serverstate = UPAPSS_INITIAL;`
241			`}`
242
243
244			`/*`
245			`* upap_protrej - Peer doesn't speak this protocol.`
246			`*`
247			`* This shouldn't happen. In any case, pretend lower layer went down.`
248			`*/`
249			`static void`
250			`upap_protrej(unit)`
251			`int unit;`
252			`{`
253			`upap_state *u = &upap[unit];`
254
255			`if (u->us_clientstate == UPAPCS_AUTHREQ) {`
256			`syslog(LOG_ERR, "PAP authentication failed due to protocol-reject");`
257			`auth_withpeer_fail(unit, PPP_PAP);`
258			`}`
259			`if (u->us_serverstate == UPAPSS_LISTEN) {`
260			`syslog(LOG_ERR, "PAP authentication of peer failed (protocol-reject)");`
261			`auth_peer_fail(unit, PPP_PAP);`
262			`}`
263			`upap_lowerdown(unit);`
264			`}`
265
266
267			`/*`
268			`* upap_input - Input UPAP packet.`
269			`*/`
270			`static void`
271			`upap_input(unit, inpacket, l)`
272			`int unit;`
273			`u_char *inpacket;`
274			`int l;`
275			`{`
276			`upap_state *u = &upap[unit];`
277			`u_char *inp;`
278			`u_char code, id;`
279			`int len;`
280
281			`/*`
282			`* Parse header (code, id and length).`
283			`* If packet too short, drop it.`
284			`*/`
285			`inp = inpacket;`
286			`if (l < UPAP_HEADERLEN) {`
287			`UPAPDEBUG((LOG_INFO, "pap_input: rcvd short header."));`
288			`return;`
289			`}`
290			`GETCHAR(code, inp);`
291			`GETCHAR(id, inp);`
292			`GETSHORT(len, inp);`
293			`if (len < UPAP_HEADERLEN) {`
294			`UPAPDEBUG((LOG_INFO, "pap_input: rcvd illegal length."));`
295			`return;`
296			`}`
297			`if (len > l) {`
298			`UPAPDEBUG((LOG_INFO, "pap_input: rcvd short packet."));`
299			`return;`
300			`}`
301			`len -= UPAP_HEADERLEN;`
302
303			`/*`
304			`* Action depends on code.`
305			`*/`
306			`switch (code) {`
307			`case UPAP_AUTHREQ:`
308			`upap_rauthreq(u, inp, id, len);`
309			`break;`
310
311			`case UPAP_AUTHACK:`
312			`upap_rauthack(u, inp, id, len);`
313			`break;`
314
315			`case UPAP_AUTHNAK:`
316			`upap_rauthnak(u, inp, id, len);`
317			`break;`
318
319			`default: /* XXX Need code reject */`
320			`break;`
321			`}`
322			`}`
323
324
325			`/*`
326			`* upap_rauth - Receive Authenticate.`
327			`*/`
328			`static void`
329			`upap_rauthreq(u, inp, id, len)`
330			`upap_state *u;`
331			`u_char *inp;`
332			`int id;`
333			`int len;`
334			`{`
335			`u_char ruserlen, rpasswdlen;`
336			`char ruser, rpasswd;`
337			`int retcode;`
338			`char *msg;`
339			`int msglen;`
340
341			`UPAPDEBUG((LOG_INFO, "pap_rauth: Rcvd id %d.", id));`
342
343			`if (u->us_serverstate < UPAPSS_LISTEN)`
344			`return;`
345
346			`/*`
347			`* If we receive a duplicate authenticate-request, we are`
348			`* supposed to return the same status as for the first request.`
349			`*/`
350			`if (u->us_serverstate == UPAPSS_OPEN) {`
351			`upap_sresp(u, UPAP_AUTHACK, id, "", 0); /* return auth-ack */`
352			`return;`
353			`}`
354			`if (u->us_serverstate == UPAPSS_BADAUTH) {`
355			`upap_sresp(u, UPAP_AUTHNAK, id, "", 0); /* return auth-nak */`
356			`return;`
357			`}`
358
359			`/*`
360			`* Parse user/passwd.`
361			`*/`
362			`if (len < sizeof (u_char)) {`
363			`UPAPDEBUG((LOG_INFO, "pap_rauth: rcvd short packet."));`
364			`return;`
365			`}`
366			`GETCHAR(ruserlen, inp);`
367			`len -= sizeof (u_char) + ruserlen + sizeof (u_char);`
368			`if (len < 0) {`
369			`UPAPDEBUG((LOG_INFO, "pap_rauth: rcvd short packet."));`
370			`return;`
371			`}`
372			`ruser = (char *) inp;`
373			`INCPTR(ruserlen, inp);`
374			`GETCHAR(rpasswdlen, inp);`
375			`if (len < rpasswdlen) {`
376			`UPAPDEBUG((LOG_INFO, "pap_rauth: rcvd short packet."));`
377			`return;`
378			`}`
379			`rpasswd = (char *) inp;`
380
381			`/*`
382			`* Check the username and password given.`
383			`*/`
384			`retcode = check_passwd(u->us_unit, ruser, ruserlen, rpasswd,`
385			`rpasswdlen, &msg, &msglen);`
386			`BZERO(rpasswd, rpasswdlen);`
387
388			`upap_sresp(u, retcode, id, msg, msglen);`
389
390			`if (retcode == UPAP_AUTHACK) {`
391			`u->us_serverstate = UPAPSS_OPEN;`
392			`auth_peer_success(u->us_unit, PPP_PAP, ruser, ruserlen);`
393			`} else {`
394			`u->us_serverstate = UPAPSS_BADAUTH;`
395			`auth_peer_fail(u->us_unit, PPP_PAP);`
396			`}`
397
398			`if (u->us_reqtimeout > 0)`
399			`UNTIMEOUT(upap_reqtimeout, u);`
400			`}`
401
402
403			`/*`
404			`* upap_rauthack - Receive Authenticate-Ack.`
405			`*/`
406			`static void`
407			`upap_rauthack(u, inp, id, len)`
408			`upap_state *u;`
409			`u_char *inp;`
410			`int id;`
411			`int len;`
412			`{`
413			`u_char msglen;`
414			`char *msg;`
415
416			`UPAPDEBUG((LOG_INFO, "pap_rauthack: Rcvd id %d.", id));`
417			`if (u->us_clientstate != UPAPCS_AUTHREQ) /* XXX */`
418			`return;`
419
420			`/*`
421			`* Parse message.`
422			`*/`
423			`if (len < sizeof (u_char)) {`
424			`UPAPDEBUG((LOG_INFO, "pap_rauthack: rcvd short packet."));`
425			`return;`
426			`}`
427			`GETCHAR(msglen, inp);`
428			`len -= sizeof (u_char);`
429			`if (len < msglen) {`
430			`UPAPDEBUG((LOG_INFO, "pap_rauthack: rcvd short packet."));`
431			`return;`
432			`}`
433			`msg = (char *) inp;`
434			`PRINTMSG(msg, msglen);`
435
436			`u->us_clientstate = UPAPCS_OPEN;`
437
438			`auth_withpeer_success(u->us_unit, PPP_PAP);`
439			`}`
440
441
442			`/*`
443			`* upap_rauthnak - Receive Authenticate-Nakk.`
444			`*/`
445			`static void`
446			`upap_rauthnak(u, inp, id, len)`
447			`upap_state *u;`
448			`u_char *inp;`
449			`int id;`
450			`int len;`
451			`{`
452			`u_char msglen;`
453			`char *msg;`
454
455			`UPAPDEBUG((LOG_INFO, "pap_rauthnak: Rcvd id %d.", id));`
456			`if (u->us_clientstate != UPAPCS_AUTHREQ) /* XXX */`
457			`return;`
458
459			`/*`
460			`* Parse message.`
461			`*/`
462			`if (len < sizeof (u_char)) {`
463			`UPAPDEBUG((LOG_INFO, "pap_rauthnak: rcvd short packet."));`
464			`return;`
465			`}`
466			`GETCHAR(msglen, inp);`
467			`len -= sizeof (u_char);`
468			`if (len < msglen) {`
469			`UPAPDEBUG((LOG_INFO, "pap_rauthnak: rcvd short packet."));`
470			`return;`
471			`}`
472			`msg = (char *) inp;`
473			`PRINTMSG(msg, msglen);`
474
475			`u->us_clientstate = UPAPCS_BADAUTH;`
476
477			`syslog(LOG_ERR, "PAP authentication failed");`
478			`auth_withpeer_fail(u->us_unit, PPP_PAP);`
479			`}`
480
481
482			`/*`
483			`* upap_sauthreq - Send an Authenticate-Request.`
484			`*/`
485			`static void`
486			`upap_sauthreq(u)`
487			`upap_state *u;`
488			`{`
489			`u_char *outp;`
490			`int outlen;`
491
492			`outlen = UPAP_HEADERLEN + 2 * sizeof (u_char) +`
493			`u->us_userlen + u->us_passwdlen;`
494			`outp = outpacket_buf;`
495
496			`MAKEHEADER(outp, PPP_PAP);`
497
498			`PUTCHAR(UPAP_AUTHREQ, outp);`
499			`PUTCHAR(++u->us_id, outp);`
500			`PUTSHORT(outlen, outp);`
501			`PUTCHAR(u->us_userlen, outp);`
502			`BCOPY(u->us_user, outp, u->us_userlen);`
503			`INCPTR(u->us_userlen, outp);`
504			`PUTCHAR(u->us_passwdlen, outp);`
505			`BCOPY(u->us_passwd, outp, u->us_passwdlen);`
506
507			`output(u->us_unit, outpacket_buf, outlen + PPP_HDRLEN);`
508
509			`UPAPDEBUG((LOG_INFO, "pap_sauth: Sent id %d.", u->us_id));`
510
511			`TIMEOUT(upap_timeout, u, u->us_timeouttime);`
512			`++u->us_transmits;`
513			`u->us_clientstate = UPAPCS_AUTHREQ;`
514			`}`
515
516
517			`/*`
518			`* upap_sresp - Send a response (ack or nak).`
519			`*/`
520			`static void`
521			`upap_sresp(u, code, id, msg, msglen)`
522			`upap_state *u;`
523			`u_char code, id;`
524			`char *msg;`
525			`int msglen;`
526			`{`
527			`u_char *outp;`
528			`int outlen;`
529
530			`outlen = UPAP_HEADERLEN + sizeof (u_char) + msglen;`
531			`outp = outpacket_buf;`
532			`MAKEHEADER(outp, PPP_PAP);`
533
534			`PUTCHAR(code, outp);`
535			`PUTCHAR(id, outp);`
536			`PUTSHORT(outlen, outp);`
537			`PUTCHAR(msglen, outp);`
538			`BCOPY(msg, outp, msglen);`
539			`output(u->us_unit, outpacket_buf, outlen + PPP_HDRLEN);`
540
541			`UPAPDEBUG((LOG_INFO, "pap_sresp: Sent code %d, id %d.", code, id));`
542			`}`
543
544			`/*`
545			`* upap_printpkt - print the contents of a PAP packet.`
546			`*/`
547			`static char *upap_codenames[] = {`
548			`"AuthReq", "AuthAck", "AuthNak"`
549			`};`
550
551			`static int`
552			`upap_printpkt(p, plen, printer, arg)`
553			`u_char *p;`
554			`int plen;`
555			`void (printer) __P((void , char *, ...));`
556			`void *arg;`
557			`{`
558			`int code, id, len;`
559			`int mlen, ulen, wlen;`
560			`char user, pwd, *msg;`
561			`u_char *pstart;`
562
563			`if (plen < UPAP_HEADERLEN)`
564			`return 0;`
565			`pstart = p;`
566			`GETCHAR(code, p);`
567			`GETCHAR(id, p);`
568			`GETSHORT(len, p);`
569			`if (len < UPAP_HEADERLEN \|\| len > plen)`
570			`return 0;`
571
572			`if (code >= 1 && code <= sizeof(upap_codenames) / sizeof(char *))`
573			`printer(arg, " %s", upap_codenames[code-1]);`
574			`else`
575			`printer(arg, " code=0x%x", code);`
576			`printer(arg, " id=0x%x", id);`
577			`len -= UPAP_HEADERLEN;`
578			`switch (code) {`
579			`case UPAP_AUTHREQ:`
580			`if (len < 1)`
581			`break;`
582			`ulen = p[0];`
583			`if (len < ulen + 2)`
584			`break;`
585			`wlen = p[ulen + 1];`
586			`if (len < ulen + wlen + 2)`
587			`break;`
588			`user = (char *) (p + 1);`
589			`pwd = (char *) (p + ulen + 2);`
590			`p += ulen + wlen + 2;`
591			`len -= ulen + wlen + 2;`
592			`printer(arg, " user=");`
593			`print_string(user, ulen, printer, arg);`
594			`printer(arg, " password=");`
595			`print_string(pwd, wlen, printer, arg);`
596			`break;`
597			`case UPAP_AUTHACK:`
598			`case UPAP_AUTHNAK:`
599			`if (len < 1)`
600			`break;`
601			`mlen = p[0];`
602			`if (len < mlen + 1)`
603			`break;`
604			`msg = (char *) (p + 1);`
605			`p += mlen + 1;`
606			`len -= mlen + 1;`
607			`printer(arg, " ");`
608			`print_string(msg, mlen, printer, arg);`
609			`break;`
610			`}`
611
612			`/* print the rest of the bytes in the packet */`
613			`for (; len > 0; --len) {`
614			`GETCHAR(code, p);`
615			`printer(arg, " %.2x", code);`
616			`}`
617
618			`return p - pstart;`
619			`}`