NetBSD/libexec/identd/parse.c

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/*
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** $NetBSD: parse.c,v 1.7 1996/08/30 17:41:38 thorpej Exp $
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**
** parse.c This file contains the protocol parser
**
** This program is in the public domain and may be used freely by anyone
** who wants to.
**
** Last update: 6 Dec 1992
**
** Please send bug fixes/bug reports to: Peter Eriksson <pen@lysator.liu.se>
*/
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <pwd.h>
#include <sys/types.h>
#include <netinet/in.h>
#ifndef HPUX7
# include <arpa/inet.h>
#endif
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#include <nlist.h>
#include <kvm.h>
#include <sys/types.h>
#include <sys/stat.h>
#if defined(MIPS) || defined(BSD43)
extern int errno;
#endif
#include "identd.h"
#include "error.h"
extern void *malloc();
/*
** This function will eat whitespace characters until
** either a non-whitespace character is read, or EOF
** occurs. This function is only used if the "-m" option
** is enabled.
*/
static int eat_whitespace()
{
int c;
while ((c = getchar()) != EOF &&
!(c == '\r' || c == '\n'))
;
if (c != EOF)
while ((c = getchar()) != EOF &&
(c == ' ' || c == '\t' || c == '\n' || c == '\r'))
;
if (c != EOF)
ungetc(c, stdin);
return (c != EOF);
}
#ifdef INCLUDE_EXTENSIONS
/*
** Validate an indirect request
*/
static int valid_fhost(faddr, password)
struct in_addr *faddr;
char *password;
{
if (indirect_host == NULL)
return 0;
if (strcmp(indirect_host, "*") != 0)
{
if (isdigit(indirect_host[0]))
{
if (strcmp(inet_ntoa(*faddr), indirect_host))
{
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syslog(LOG_NOTICE, "valid_fhost: access denied for: %s",
gethost(faddr));
return 0;
}
}
else
{
if (strcmp(gethost(faddr), indirect_host))
{
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syslog(LOG_NOTICE, "valid_fhost: access denied for: %s",
gethost(faddr));
return 0;
}
}
}
if (indirect_password == NULL)
return 1;
if (strcmp(password, indirect_password))
{
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syslog(LOG_NOTICE, "valid_fhost: invalid password from: %s",
gethost(faddr));
return 0;
}
return 1;
}
#endif
/*
** A small routine to check for the existance of the ".noident"
** file in a users home directory.
*/
static int check_noident(homedir)
char *homedir;
{
char *tmp_path;
struct stat sbuf;
int rcode;
if (!homedir)
return 0;
tmp_path = (char *) malloc(strlen(homedir) + sizeof("/.noident") + 1);
if (!tmp_path)
return 0;
strcpy(tmp_path, homedir);
strcat(tmp_path, "/.noident");
rcode = stat(tmp_path, &sbuf);
free(tmp_path);
return (rcode == 0);
}
int parse(fp, laddr, faddr)
FILE *fp;
struct in_addr *laddr, *faddr;
{
int uid, try, rcode;
struct passwd *pwp;
char lhostaddr[16];
char fhostaddr[16];
char password[33];
#ifdef INCLUDE_EXTENSIONS
char arg[33];
int c;
#endif
struct in_addr laddr2;
struct in_addr faddr2;
if (debug_flag && syslog_flag)
syslog(LOG_DEBUG, "In function parse()");
/*
** Get the local/foreign port pair from the luser
*/
do
{
if (debug_flag && syslog_flag)
syslog(LOG_DEBUG, " Before fscanf()");
faddr2 = *faddr;
laddr2 = *laddr;
lport = fport = 0;
lhostaddr[0] = fhostaddr[0] = password[0] = '\0';
/* Read query from client */
rcode = fscanf(fp, " %d , %d", &lport, &fport);
#ifdef INCLUDE_EXTENSIONS
/*
** Do additional parsing in case of extended request
*/
if (rcode == 0)
{
rcode = fscanf(fp, "%32[^ \t\n\r:]", arg);
/* Skip leading space up to EOF, EOL or non-space char */
while ((c = getc(fp)) == ' ' || c == '\t')
;
if (rcode <= 0)
{
printf("%d , %d : ERROR : %s\r\n",
lport, fport,
unknown_flag ? "UNKNOWN-ERROR" : "X-INVALID-REQUEST");
continue;
}
/*
** Non-standard extended request, returns with Pidentd
** version information
*/
if (strcmp(arg, "VERSION") == 0)
{
printf("%d , %d : ERROR : X-VERSION : %s\r\n", lport, fport,
version);
continue;
}
/*
** Non-standard extended proxy request
*/
else if (strcmp(arg, "PROXY") == 0 && c == ':')
{
/* We have a colon char, check for port numbers */
rcode = fscanf(fp, " %d , %d : %15[0-9.] , %15[0-9.]",
&lport, &fport, fhostaddr, lhostaddr);
if (!(rcode == 3 || rcode == 4))
{
printf("%d , %d : ERROR : %s\r\n",
lport, fport,
unknown_flag ? "UNKNOWN-ERROR" : "X-INVALID-REQUEST");
continue;
}
if (rcode == 4)
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(void) inet_aton(lhostaddr, &laddr2);
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(void) inet_aton(fhostaddr, &faddr2);
proxy(&laddr2, &faddr2, lport, fport, NULL);
continue;
}
/*
** Non-standard extended remote indirect request
*/
else if (strcmp(arg, "REMOTE") == 0 && c == ':')
{
/* We have a colon char, check for port numbers */
rcode = fscanf(fp, " %d , %d", &lport, &fport);
/* Skip leading space up to EOF, EOL or non-space char */
while ((c = getc(fp)) == ' ' || c == '\t')
;
if (rcode != 2 || c != ':')
{
printf("%d , %d : ERROR : %s\r\n",
lport, fport,
unknown_flag ? "UNKNOWN-ERROR" : "X-INVALID-REQUEST");
continue;
}
/* We have a colon char, check for addr and password */
rcode = fscanf(fp, " %15[0-9.] , %32[^ \t\r\n]",
fhostaddr, password);
if (rcode > 0)
rcode += 2;
else
{
printf("%d , %d : ERROR : %s\r\n",
lport, fport,
unknown_flag ? "UNKNOWN-ERROR" : "X-INVALID-REQUEST");
continue;
}
/*
** Verify that the host originating the indirect request
** is allowed to do that
*/
if (!valid_fhost(faddr, password))
{
printf("%d , %d : ERROR : %s\r\n",
lport, fport,
unknown_flag ? "UNKNOWN-ERROR" : "X-ACCESS-DENIED");
continue;
}
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(void) inet_aton(fhostaddr, &faddr2);
}
else
{
printf("%d , %d : ERROR : %s\r\n",
lport, fport,
unknown_flag ? "UNKNOWN-ERROR" : "X-INVALID-REQUEST");
continue;
}
}
#endif /* EXTENSIONS */
if (rcode < 2 || lport < 1 || lport > 65535 || fport < 1 || fport > 65535)
{
if (syslog_flag && rcode > 0)
syslog(LOG_NOTICE, "scanf: invalid-port(s): %d , %d from %s",
lport, fport, gethost(faddr));
printf("%d , %d : ERROR : %s\r\n",
lport, fport,
unknown_flag ? "UNKNOWN-ERROR" : "INVALID-PORT");
continue;
}
if (syslog_flag && verbose_flag)
syslog(LOG_NOTICE, "request for (%d,%d) from %s",
lport, fport, gethost(faddr));
if (debug_flag && syslog_flag)
syslog(LOG_DEBUG, " After fscanf(), before k_getuid()");
/*
** Next - get the specific TCP connection and return the
** uid - user number.
**
** Try to fetch the information 5 times incase the
** kernel changed beneath us and we missed or took
** a fault.
*/
for (try = 0;
(try < 5 &&
k_getuid(&faddr2, htons(fport), laddr, htons(lport), &uid) == -1);
try++)
;
if (try >= 5)
{
if (syslog_flag)
syslog(LOG_DEBUG, "Returned: %d , %d : NO-USER", lport, fport);
printf("%d , %d : ERROR : %s\r\n",
lport, fport,
unknown_flag ? "UNKNOWN-ERROR" : "NO-USER");
continue;
}
if (try > 0 && syslog_flag)
syslog(LOG_NOTICE, "k_getuid retries: %d", try);
if (debug_flag && syslog_flag)
syslog(LOG_DEBUG, " After k_getuid(), before getpwuid()");
/*
** Then we should try to get the username. If that fails we
** return it as an OTHER identifier
*/
pwp = getpwuid(uid);
if (!pwp)
{
if (syslog_flag)
syslog(LOG_WARNING, "getpwuid() could not map uid (%d) to name",
uid);
printf("%d , %d : USERID : OTHER%s%s :%d\r\n",
lport, fport,
charset_name ? " , " : "",
charset_name ? charset_name : "",
uid);
continue;
}
/*
** Hey! We finally made it!!!
*/
if (syslog_flag)
syslog(LOG_DEBUG, "Successful lookup: %d , %d : %s\n",
lport, fport, pwp->pw_name);
if (noident_flag && check_noident(pwp->pw_dir))
{
if (syslog_flag && verbose_flag)
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syslog(LOG_NOTICE, "user %s requested HIDDEN-USER for host %s: %d, %d",
pwp->pw_name,
gethost(faddr),
lport, fport);
printf("%d , %d : ERROR : HIDDEN-USER\r\n",
lport, fport);
continue;
}
if (number_flag)
printf("%d , %d : USERID : OTHER%s%s :%d\r\n",
lport, fport,
charset_name ? " , " : "",
charset_name ? charset_name : "",
uid);
else
printf("%d , %d : USERID : %s%s%s :%s\r\n",
lport, fport,
other_flag ? "OTHER" : "UNIX",
charset_name ? " , " : "",
charset_name ? charset_name : "",
pwp->pw_name);
} while(fflush(stdout), fflush(stderr), multi_flag && eat_whitespace());
return 0;
}