mirror of git://anongit.mindrot.org/openssh.git
575 lines
15 KiB
C
575 lines
15 KiB
C
/*
|
|
*
|
|
* servconf.c
|
|
*
|
|
* Author: Tatu Ylonen <ylo@cs.hut.fi>
|
|
*
|
|
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
|
|
* All rights reserved
|
|
*
|
|
* Created: Mon Aug 21 15:48:58 1995 ylo
|
|
*
|
|
*/
|
|
|
|
#include "includes.h"
|
|
RCSID("$Id: servconf.c,v 1.10 2000/04/12 08:45:06 damien Exp $");
|
|
|
|
#include "ssh.h"
|
|
#include "servconf.h"
|
|
#include "xmalloc.h"
|
|
|
|
/* add listen address */
|
|
void add_listen_addr(ServerOptions *options, char *addr);
|
|
|
|
/* Initializes the server options to their default values. */
|
|
|
|
void
|
|
initialize_server_options(ServerOptions *options)
|
|
{
|
|
memset(options, 0, sizeof(*options));
|
|
options->num_ports = 0;
|
|
options->ports_from_cmdline = 0;
|
|
options->listen_addrs = NULL;
|
|
options->host_key_file = NULL;
|
|
options->dsa_key_file = NULL;
|
|
options->server_key_bits = -1;
|
|
options->login_grace_time = -1;
|
|
options->key_regeneration_time = -1;
|
|
options->permit_root_login = -1;
|
|
options->ignore_rhosts = -1;
|
|
options->ignore_user_known_hosts = -1;
|
|
options->print_motd = -1;
|
|
options->check_mail = -1;
|
|
options->x11_forwarding = -1;
|
|
options->x11_display_offset = -1;
|
|
options->strict_modes = -1;
|
|
options->keepalives = -1;
|
|
options->log_facility = (SyslogFacility) - 1;
|
|
options->log_level = (LogLevel) - 1;
|
|
options->rhosts_authentication = -1;
|
|
options->rhosts_rsa_authentication = -1;
|
|
options->rsa_authentication = -1;
|
|
#ifdef KRB4
|
|
options->kerberos_authentication = -1;
|
|
options->kerberos_or_local_passwd = -1;
|
|
options->kerberos_ticket_cleanup = -1;
|
|
#endif
|
|
#ifdef AFS
|
|
options->kerberos_tgt_passing = -1;
|
|
options->afs_token_passing = -1;
|
|
#endif
|
|
options->password_authentication = -1;
|
|
#ifdef SKEY
|
|
options->skey_authentication = -1;
|
|
#endif
|
|
options->permit_empty_passwd = -1;
|
|
options->use_login = -1;
|
|
options->num_allow_users = 0;
|
|
options->num_deny_users = 0;
|
|
options->num_allow_groups = 0;
|
|
options->num_deny_groups = 0;
|
|
}
|
|
|
|
void
|
|
fill_default_server_options(ServerOptions *options)
|
|
{
|
|
if (options->num_ports == 0)
|
|
options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
|
|
if (options->listen_addrs == NULL)
|
|
add_listen_addr(options, NULL);
|
|
if (options->host_key_file == NULL)
|
|
options->host_key_file = HOST_KEY_FILE;
|
|
if (options->dsa_key_file == NULL)
|
|
options->dsa_key_file = DSA_KEY_FILE;
|
|
if (options->server_key_bits == -1)
|
|
options->server_key_bits = 768;
|
|
if (options->login_grace_time == -1)
|
|
options->login_grace_time = 600;
|
|
if (options->key_regeneration_time == -1)
|
|
options->key_regeneration_time = 3600;
|
|
if (options->permit_root_login == -1)
|
|
options->permit_root_login = 1; /* yes */
|
|
if (options->ignore_rhosts == -1)
|
|
options->ignore_rhosts = 1;
|
|
if (options->ignore_user_known_hosts == -1)
|
|
options->ignore_user_known_hosts = 0;
|
|
if (options->check_mail == -1)
|
|
options->check_mail = 0;
|
|
if (options->print_motd == -1)
|
|
options->print_motd = 1;
|
|
if (options->x11_forwarding == -1)
|
|
options->x11_forwarding = 0;
|
|
if (options->x11_display_offset == -1)
|
|
options->x11_display_offset = 10;
|
|
if (options->strict_modes == -1)
|
|
options->strict_modes = 1;
|
|
if (options->keepalives == -1)
|
|
options->keepalives = 1;
|
|
if (options->log_facility == (SyslogFacility) (-1))
|
|
options->log_facility = SYSLOG_FACILITY_AUTH;
|
|
if (options->log_level == (LogLevel) (-1))
|
|
options->log_level = SYSLOG_LEVEL_INFO;
|
|
if (options->rhosts_authentication == -1)
|
|
options->rhosts_authentication = 0;
|
|
if (options->rhosts_rsa_authentication == -1)
|
|
options->rhosts_rsa_authentication = 0;
|
|
if (options->rsa_authentication == -1)
|
|
options->rsa_authentication = 1;
|
|
#ifdef KRB4
|
|
if (options->kerberos_authentication == -1)
|
|
options->kerberos_authentication = (access(KEYFILE, R_OK) == 0);
|
|
if (options->kerberos_or_local_passwd == -1)
|
|
options->kerberos_or_local_passwd = 1;
|
|
if (options->kerberos_ticket_cleanup == -1)
|
|
options->kerberos_ticket_cleanup = 1;
|
|
#endif /* KRB4 */
|
|
#ifdef AFS
|
|
if (options->kerberos_tgt_passing == -1)
|
|
options->kerberos_tgt_passing = 0;
|
|
if (options->afs_token_passing == -1)
|
|
options->afs_token_passing = k_hasafs();
|
|
#endif /* AFS */
|
|
if (options->password_authentication == -1)
|
|
options->password_authentication = 1;
|
|
#ifdef SKEY
|
|
if (options->skey_authentication == -1)
|
|
options->skey_authentication = 1;
|
|
#endif
|
|
if (options->permit_empty_passwd == -1)
|
|
options->permit_empty_passwd = 0;
|
|
if (options->use_login == -1)
|
|
options->use_login = 0;
|
|
}
|
|
|
|
#define WHITESPACE " \t\r\n"
|
|
|
|
/* Keyword tokens. */
|
|
typedef enum {
|
|
sBadOption, /* == unknown option */
|
|
sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime,
|
|
sPermitRootLogin, sLogFacility, sLogLevel,
|
|
sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication,
|
|
#ifdef KRB4
|
|
sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
|
|
#endif
|
|
#ifdef AFS
|
|
sKerberosTgtPassing, sAFSTokenPassing,
|
|
#endif
|
|
#ifdef SKEY
|
|
sSkeyAuthentication,
|
|
#endif
|
|
sPasswordAuthentication, sListenAddress,
|
|
sPrintMotd, sIgnoreRhosts, sX11Forwarding, sX11DisplayOffset,
|
|
sStrictModes, sEmptyPasswd, sRandomSeedFile, sKeepAlives, sCheckMail,
|
|
sUseLogin, sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups,
|
|
sIgnoreUserKnownHosts, sDSAKeyFile
|
|
} ServerOpCodes;
|
|
|
|
/* Textual representation of the tokens. */
|
|
static struct {
|
|
const char *name;
|
|
ServerOpCodes opcode;
|
|
} keywords[] = {
|
|
{ "port", sPort },
|
|
{ "hostkey", sHostKeyFile },
|
|
{ "dsakey", sDSAKeyFile },
|
|
{ "serverkeybits", sServerKeyBits },
|
|
{ "logingracetime", sLoginGraceTime },
|
|
{ "keyregenerationinterval", sKeyRegenerationTime },
|
|
{ "permitrootlogin", sPermitRootLogin },
|
|
{ "syslogfacility", sLogFacility },
|
|
{ "loglevel", sLogLevel },
|
|
{ "rhostsauthentication", sRhostsAuthentication },
|
|
{ "rhostsrsaauthentication", sRhostsRSAAuthentication },
|
|
{ "rsaauthentication", sRSAAuthentication },
|
|
#ifdef KRB4
|
|
{ "kerberosauthentication", sKerberosAuthentication },
|
|
{ "kerberosorlocalpasswd", sKerberosOrLocalPasswd },
|
|
{ "kerberosticketcleanup", sKerberosTicketCleanup },
|
|
#endif
|
|
#ifdef AFS
|
|
{ "kerberostgtpassing", sKerberosTgtPassing },
|
|
{ "afstokenpassing", sAFSTokenPassing },
|
|
#endif
|
|
{ "passwordauthentication", sPasswordAuthentication },
|
|
#ifdef SKEY
|
|
{ "skeyauthentication", sSkeyAuthentication },
|
|
#endif
|
|
{ "checkmail", sCheckMail },
|
|
{ "listenaddress", sListenAddress },
|
|
{ "printmotd", sPrintMotd },
|
|
{ "ignorerhosts", sIgnoreRhosts },
|
|
{ "ignoreuserknownhosts", sIgnoreUserKnownHosts },
|
|
{ "x11forwarding", sX11Forwarding },
|
|
{ "x11displayoffset", sX11DisplayOffset },
|
|
{ "strictmodes", sStrictModes },
|
|
{ "permitemptypasswords", sEmptyPasswd },
|
|
{ "uselogin", sUseLogin },
|
|
{ "randomseed", sRandomSeedFile },
|
|
{ "keepalive", sKeepAlives },
|
|
{ "allowusers", sAllowUsers },
|
|
{ "denyusers", sDenyUsers },
|
|
{ "allowgroups", sAllowGroups },
|
|
{ "denygroups", sDenyGroups },
|
|
{ NULL, 0 }
|
|
};
|
|
|
|
/*
|
|
* Returns the number of the token pointed to by cp of length len. Never
|
|
* returns if the token is not known.
|
|
*/
|
|
|
|
static ServerOpCodes
|
|
parse_token(const char *cp, const char *filename,
|
|
int linenum)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; keywords[i].name; i++)
|
|
if (strcasecmp(cp, keywords[i].name) == 0)
|
|
return keywords[i].opcode;
|
|
|
|
fprintf(stderr, "%s: line %d: Bad configuration option: %s\n",
|
|
filename, linenum, cp);
|
|
return sBadOption;
|
|
}
|
|
|
|
/*
|
|
* add listen address
|
|
*/
|
|
void
|
|
add_listen_addr(ServerOptions *options, char *addr)
|
|
{
|
|
extern int IPv4or6;
|
|
struct addrinfo hints, *ai, *aitop;
|
|
char strport[NI_MAXSERV];
|
|
int gaierr;
|
|
int i;
|
|
|
|
if (options->num_ports == 0)
|
|
options->ports[options->num_ports++] = SSH_DEFAULT_PORT;
|
|
for (i = 0; i < options->num_ports; i++) {
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_family = IPv4or6;
|
|
hints.ai_socktype = SOCK_STREAM;
|
|
hints.ai_flags = (addr == NULL) ? AI_PASSIVE : 0;
|
|
snprintf(strport, sizeof strport, "%d", options->ports[i]);
|
|
if ((gaierr = getaddrinfo(addr, strport, &hints, &aitop)) != 0)
|
|
fatal("bad addr or host: %s (%s)\n",
|
|
addr ? addr : "<NULL>",
|
|
gai_strerror(gaierr));
|
|
for (ai = aitop; ai->ai_next; ai = ai->ai_next)
|
|
;
|
|
ai->ai_next = options->listen_addrs;
|
|
options->listen_addrs = aitop;
|
|
}
|
|
}
|
|
|
|
/* Reads the server configuration file. */
|
|
|
|
void
|
|
read_server_config(ServerOptions *options, const char *filename)
|
|
{
|
|
FILE *f;
|
|
char line[1024];
|
|
char *cp, **charptr;
|
|
int linenum, *intptr, value;
|
|
int bad_options = 0;
|
|
ServerOpCodes opcode;
|
|
|
|
f = fopen(filename, "r");
|
|
if (!f) {
|
|
perror(filename);
|
|
exit(1);
|
|
}
|
|
linenum = 0;
|
|
while (fgets(line, sizeof(line), f)) {
|
|
linenum++;
|
|
cp = line + strspn(line, WHITESPACE);
|
|
if (!*cp || *cp == '#')
|
|
continue;
|
|
cp = strtok(cp, WHITESPACE);
|
|
opcode = parse_token(cp, filename, linenum);
|
|
switch (opcode) {
|
|
case sBadOption:
|
|
bad_options++;
|
|
continue;
|
|
case sPort:
|
|
/* ignore ports from configfile if cmdline specifies ports */
|
|
if (options->ports_from_cmdline)
|
|
continue;
|
|
if (options->listen_addrs != NULL)
|
|
fatal("%s line %d: ports must be specified before "
|
|
"ListenAdress.\n", filename, linenum);
|
|
if (options->num_ports >= MAX_PORTS)
|
|
fatal("%s line %d: too many ports.\n",
|
|
filename, linenum);
|
|
cp = strtok(NULL, WHITESPACE);
|
|
if (!cp)
|
|
fatal("%s line %d: missing port number.\n",
|
|
filename, linenum);
|
|
options->ports[options->num_ports++] = atoi(cp);
|
|
break;
|
|
|
|
case sServerKeyBits:
|
|
intptr = &options->server_key_bits;
|
|
parse_int:
|
|
cp = strtok(NULL, WHITESPACE);
|
|
if (!cp) {
|
|
fprintf(stderr, "%s line %d: missing integer value.\n",
|
|
filename, linenum);
|
|
exit(1);
|
|
}
|
|
value = atoi(cp);
|
|
if (*intptr == -1)
|
|
*intptr = value;
|
|
break;
|
|
|
|
case sLoginGraceTime:
|
|
intptr = &options->login_grace_time;
|
|
goto parse_int;
|
|
|
|
case sKeyRegenerationTime:
|
|
intptr = &options->key_regeneration_time;
|
|
goto parse_int;
|
|
|
|
case sListenAddress:
|
|
cp = strtok(NULL, WHITESPACE);
|
|
if (!cp)
|
|
fatal("%s line %d: missing inet addr.\n",
|
|
filename, linenum);
|
|
add_listen_addr(options, cp);
|
|
break;
|
|
|
|
case sHostKeyFile:
|
|
case sDSAKeyFile:
|
|
charptr = (opcode == sHostKeyFile ) ?
|
|
&options->host_key_file : &options->dsa_key_file;
|
|
cp = strtok(NULL, WHITESPACE);
|
|
if (!cp) {
|
|
fprintf(stderr, "%s line %d: missing file name.\n",
|
|
filename, linenum);
|
|
exit(1);
|
|
}
|
|
if (*charptr == NULL)
|
|
*charptr = tilde_expand_filename(cp, getuid());
|
|
break;
|
|
|
|
case sRandomSeedFile:
|
|
fprintf(stderr, "%s line %d: \"randomseed\" option is obsolete.\n",
|
|
filename, linenum);
|
|
cp = strtok(NULL, WHITESPACE);
|
|
break;
|
|
|
|
case sPermitRootLogin:
|
|
intptr = &options->permit_root_login;
|
|
cp = strtok(NULL, WHITESPACE);
|
|
if (!cp) {
|
|
fprintf(stderr, "%s line %d: missing yes/without-password/no argument.\n",
|
|
filename, linenum);
|
|
exit(1);
|
|
}
|
|
if (strcmp(cp, "without-password") == 0)
|
|
value = 2;
|
|
else if (strcmp(cp, "yes") == 0)
|
|
value = 1;
|
|
else if (strcmp(cp, "no") == 0)
|
|
value = 0;
|
|
else {
|
|
fprintf(stderr, "%s line %d: Bad yes/without-password/no argument: %s\n",
|
|
filename, linenum, cp);
|
|
exit(1);
|
|
}
|
|
if (*intptr == -1)
|
|
*intptr = value;
|
|
break;
|
|
|
|
case sIgnoreRhosts:
|
|
intptr = &options->ignore_rhosts;
|
|
parse_flag:
|
|
cp = strtok(NULL, WHITESPACE);
|
|
if (!cp) {
|
|
fprintf(stderr, "%s line %d: missing yes/no argument.\n",
|
|
filename, linenum);
|
|
exit(1);
|
|
}
|
|
if (strcmp(cp, "yes") == 0)
|
|
value = 1;
|
|
else if (strcmp(cp, "no") == 0)
|
|
value = 0;
|
|
else {
|
|
fprintf(stderr, "%s line %d: Bad yes/no argument: %s\n",
|
|
filename, linenum, cp);
|
|
exit(1);
|
|
}
|
|
if (*intptr == -1)
|
|
*intptr = value;
|
|
break;
|
|
|
|
case sIgnoreUserKnownHosts:
|
|
intptr = &options->ignore_user_known_hosts;
|
|
goto parse_flag;
|
|
|
|
case sRhostsAuthentication:
|
|
intptr = &options->rhosts_authentication;
|
|
goto parse_flag;
|
|
|
|
case sRhostsRSAAuthentication:
|
|
intptr = &options->rhosts_rsa_authentication;
|
|
goto parse_flag;
|
|
|
|
case sRSAAuthentication:
|
|
intptr = &options->rsa_authentication;
|
|
goto parse_flag;
|
|
|
|
#ifdef KRB4
|
|
case sKerberosAuthentication:
|
|
intptr = &options->kerberos_authentication;
|
|
goto parse_flag;
|
|
|
|
case sKerberosOrLocalPasswd:
|
|
intptr = &options->kerberos_or_local_passwd;
|
|
goto parse_flag;
|
|
|
|
case sKerberosTicketCleanup:
|
|
intptr = &options->kerberos_ticket_cleanup;
|
|
goto parse_flag;
|
|
#endif
|
|
|
|
#ifdef AFS
|
|
case sKerberosTgtPassing:
|
|
intptr = &options->kerberos_tgt_passing;
|
|
goto parse_flag;
|
|
|
|
case sAFSTokenPassing:
|
|
intptr = &options->afs_token_passing;
|
|
goto parse_flag;
|
|
#endif
|
|
|
|
case sPasswordAuthentication:
|
|
intptr = &options->password_authentication;
|
|
goto parse_flag;
|
|
|
|
case sCheckMail:
|
|
intptr = &options->check_mail;
|
|
goto parse_flag;
|
|
|
|
#ifdef SKEY
|
|
case sSkeyAuthentication:
|
|
intptr = &options->skey_authentication;
|
|
goto parse_flag;
|
|
#endif
|
|
|
|
case sPrintMotd:
|
|
intptr = &options->print_motd;
|
|
goto parse_flag;
|
|
|
|
case sX11Forwarding:
|
|
intptr = &options->x11_forwarding;
|
|
goto parse_flag;
|
|
|
|
case sX11DisplayOffset:
|
|
intptr = &options->x11_display_offset;
|
|
goto parse_int;
|
|
|
|
case sStrictModes:
|
|
intptr = &options->strict_modes;
|
|
goto parse_flag;
|
|
|
|
case sKeepAlives:
|
|
intptr = &options->keepalives;
|
|
goto parse_flag;
|
|
|
|
case sEmptyPasswd:
|
|
intptr = &options->permit_empty_passwd;
|
|
goto parse_flag;
|
|
|
|
case sUseLogin:
|
|
intptr = &options->use_login;
|
|
goto parse_flag;
|
|
|
|
case sLogFacility:
|
|
intptr = (int *) &options->log_facility;
|
|
cp = strtok(NULL, WHITESPACE);
|
|
value = log_facility_number(cp);
|
|
if (value == (SyslogFacility) - 1)
|
|
fatal("%.200s line %d: unsupported log facility '%s'\n",
|
|
filename, linenum, cp ? cp : "<NONE>");
|
|
if (*intptr == -1)
|
|
*intptr = (SyslogFacility) value;
|
|
break;
|
|
|
|
case sLogLevel:
|
|
intptr = (int *) &options->log_level;
|
|
cp = strtok(NULL, WHITESPACE);
|
|
value = log_level_number(cp);
|
|
if (value == (LogLevel) - 1)
|
|
fatal("%.200s line %d: unsupported log level '%s'\n",
|
|
filename, linenum, cp ? cp : "<NONE>");
|
|
if (*intptr == -1)
|
|
*intptr = (LogLevel) value;
|
|
break;
|
|
|
|
case sAllowUsers:
|
|
while ((cp = strtok(NULL, WHITESPACE))) {
|
|
if (options->num_allow_users >= MAX_ALLOW_USERS) {
|
|
fprintf(stderr, "%s line %d: too many allow users.\n",
|
|
filename, linenum);
|
|
exit(1);
|
|
}
|
|
options->allow_users[options->num_allow_users++] = xstrdup(cp);
|
|
}
|
|
break;
|
|
|
|
case sDenyUsers:
|
|
while ((cp = strtok(NULL, WHITESPACE))) {
|
|
if (options->num_deny_users >= MAX_DENY_USERS) {
|
|
fprintf(stderr, "%s line %d: too many deny users.\n",
|
|
filename, linenum);
|
|
exit(1);
|
|
}
|
|
options->deny_users[options->num_deny_users++] = xstrdup(cp);
|
|
}
|
|
break;
|
|
|
|
case sAllowGroups:
|
|
while ((cp = strtok(NULL, WHITESPACE))) {
|
|
if (options->num_allow_groups >= MAX_ALLOW_GROUPS) {
|
|
fprintf(stderr, "%s line %d: too many allow groups.\n",
|
|
filename, linenum);
|
|
exit(1);
|
|
}
|
|
options->allow_groups[options->num_allow_groups++] = xstrdup(cp);
|
|
}
|
|
break;
|
|
|
|
case sDenyGroups:
|
|
while ((cp = strtok(NULL, WHITESPACE))) {
|
|
if (options->num_deny_groups >= MAX_DENY_GROUPS) {
|
|
fprintf(stderr, "%s line %d: too many deny groups.\n",
|
|
filename, linenum);
|
|
exit(1);
|
|
}
|
|
options->deny_groups[options->num_deny_groups++] = xstrdup(cp);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
fprintf(stderr, "%s line %d: Missing handler for opcode %s (%d)\n",
|
|
filename, linenum, cp, opcode);
|
|
exit(1);
|
|
}
|
|
if (strtok(NULL, WHITESPACE) != NULL) {
|
|
fprintf(stderr, "%s line %d: garbage at end of line.\n",
|
|
filename, linenum);
|
|
exit(1);
|
|
}
|
|
}
|
|
fclose(f);
|
|
if (bad_options > 0) {
|
|
fprintf(stderr, "%s: terminating, %d bad configuration options\n",
|
|
filename, bad_options);
|
|
exit(1);
|
|
}
|
|
}
|