version 1.40.2.3, 2000/11/08 21:31:12 |
version 1.40.2.4, 2001/03/12 15:44:14 |
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#include "includes.h" |
#include "includes.h" |
RCSID("$OpenBSD$"); |
RCSID("$OpenBSD$"); |
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#ifdef KRB4 |
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#include <krb.h> |
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#endif |
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#ifdef AFS |
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#include <kafs.h> |
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#endif |
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#include "ssh.h" |
#include "ssh.h" |
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#include "log.h" |
#include "servconf.h" |
#include "servconf.h" |
#include "xmalloc.h" |
#include "xmalloc.h" |
#include "compat.h" |
#include "compat.h" |
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#include "pathnames.h" |
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#include "tildexpand.h" |
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#include "misc.h" |
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#include "cipher.h" |
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#include "kex.h" |
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#include "mac.h" |
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/* add listen address */ |
/* add listen address */ |
void add_listen_addr(ServerOptions *options, char *addr); |
void add_listen_addr(ServerOptions *options, char *addr); |
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/* AF_UNSPEC or AF_INET or AF_INET6 */ |
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extern int IPv4or6; |
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/* Initializes the server options to their default values. */ |
/* Initializes the server options to their default values. */ |
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void |
void |
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options->num_ports = 0; |
options->num_ports = 0; |
options->ports_from_cmdline = 0; |
options->ports_from_cmdline = 0; |
options->listen_addrs = NULL; |
options->listen_addrs = NULL; |
options->host_key_file = NULL; |
options->num_host_key_files = 0; |
options->host_dsa_key_file = NULL; |
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options->pid_file = NULL; |
options->pid_file = NULL; |
options->server_key_bits = -1; |
options->server_key_bits = -1; |
options->login_grace_time = -1; |
options->login_grace_time = -1; |
options->key_regeneration_time = -1; |
options->key_regeneration_time = -1; |
options->permit_root_login = -1; |
options->permit_root_login = PERMIT_NOT_SET; |
options->ignore_rhosts = -1; |
options->ignore_rhosts = -1; |
options->ignore_user_known_hosts = -1; |
options->ignore_user_known_hosts = -1; |
options->print_motd = -1; |
options->print_motd = -1; |
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options->rhosts_authentication = -1; |
options->rhosts_authentication = -1; |
options->rhosts_rsa_authentication = -1; |
options->rhosts_rsa_authentication = -1; |
options->rsa_authentication = -1; |
options->rsa_authentication = -1; |
options->dsa_authentication = -1; |
options->pubkey_authentication = -1; |
#ifdef KRB4 |
#ifdef KRB4 |
options->kerberos_authentication = -1; |
options->kerberos_authentication = -1; |
options->kerberos_or_local_passwd = -1; |
options->kerberos_or_local_passwd = -1; |
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#endif |
#endif |
options->password_authentication = -1; |
options->password_authentication = -1; |
options->kbd_interactive_authentication = -1; |
options->kbd_interactive_authentication = -1; |
#ifdef SKEY |
options->challenge_reponse_authentication = -1; |
options->skey_authentication = -1; |
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#endif |
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options->permit_empty_passwd = -1; |
options->permit_empty_passwd = -1; |
options->use_login = -1; |
options->use_login = -1; |
options->allow_tcp_forwarding = -1; |
options->allow_tcp_forwarding = -1; |
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options->num_allow_groups = 0; |
options->num_allow_groups = 0; |
options->num_deny_groups = 0; |
options->num_deny_groups = 0; |
options->ciphers = NULL; |
options->ciphers = NULL; |
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options->macs = NULL; |
options->protocol = SSH_PROTO_UNKNOWN; |
options->protocol = SSH_PROTO_UNKNOWN; |
options->gateway_ports = -1; |
options->gateway_ports = -1; |
options->num_subsystems = 0; |
options->num_subsystems = 0; |
options->max_startups_begin = -1; |
options->max_startups_begin = -1; |
options->max_startups_rate = -1; |
options->max_startups_rate = -1; |
options->max_startups = -1; |
options->max_startups = -1; |
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options->banner = NULL; |
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options->reverse_mapping_check = -1; |
} |
} |
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void |
void |
fill_default_server_options(ServerOptions *options) |
fill_default_server_options(ServerOptions *options) |
{ |
{ |
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if (options->protocol == SSH_PROTO_UNKNOWN) |
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options->protocol = SSH_PROTO_1|SSH_PROTO_2; |
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if (options->num_host_key_files == 0) { |
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/* fill default hostkeys for protocols */ |
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if (options->protocol & SSH_PROTO_1) |
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options->host_key_files[options->num_host_key_files++] = _PATH_HOST_KEY_FILE; |
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if (options->protocol & SSH_PROTO_2) |
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options->host_key_files[options->num_host_key_files++] = _PATH_HOST_DSA_KEY_FILE; |
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} |
if (options->num_ports == 0) |
if (options->num_ports == 0) |
options->ports[options->num_ports++] = SSH_DEFAULT_PORT; |
options->ports[options->num_ports++] = SSH_DEFAULT_PORT; |
if (options->listen_addrs == NULL) |
if (options->listen_addrs == NULL) |
add_listen_addr(options, NULL); |
add_listen_addr(options, NULL); |
if (options->host_key_file == NULL) |
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options->host_key_file = HOST_KEY_FILE; |
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if (options->host_dsa_key_file == NULL) |
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options->host_dsa_key_file = HOST_DSA_KEY_FILE; |
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if (options->pid_file == NULL) |
if (options->pid_file == NULL) |
options->pid_file = SSH_DAEMON_PID_FILE; |
options->pid_file = _PATH_SSH_DAEMON_PID_FILE; |
if (options->server_key_bits == -1) |
if (options->server_key_bits == -1) |
options->server_key_bits = 768; |
options->server_key_bits = 768; |
if (options->login_grace_time == -1) |
if (options->login_grace_time == -1) |
options->login_grace_time = 600; |
options->login_grace_time = 600; |
if (options->key_regeneration_time == -1) |
if (options->key_regeneration_time == -1) |
options->key_regeneration_time = 3600; |
options->key_regeneration_time = 3600; |
if (options->permit_root_login == -1) |
if (options->permit_root_login == PERMIT_NOT_SET) |
options->permit_root_login = 1; /* yes */ |
options->permit_root_login = PERMIT_YES; |
if (options->ignore_rhosts == -1) |
if (options->ignore_rhosts == -1) |
options->ignore_rhosts = 1; |
options->ignore_rhosts = 1; |
if (options->ignore_user_known_hosts == -1) |
if (options->ignore_user_known_hosts == -1) |
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options->rhosts_rsa_authentication = 0; |
options->rhosts_rsa_authentication = 0; |
if (options->rsa_authentication == -1) |
if (options->rsa_authentication == -1) |
options->rsa_authentication = 1; |
options->rsa_authentication = 1; |
if (options->dsa_authentication == -1) |
if (options->pubkey_authentication == -1) |
options->dsa_authentication = 1; |
options->pubkey_authentication = 1; |
#ifdef KRB4 |
#ifdef KRB4 |
if (options->kerberos_authentication == -1) |
if (options->kerberos_authentication == -1) |
options->kerberos_authentication = (access(KEYFILE, R_OK) == 0); |
options->kerberos_authentication = (access(KEYFILE, R_OK) == 0); |
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options->password_authentication = 1; |
options->password_authentication = 1; |
if (options->kbd_interactive_authentication == -1) |
if (options->kbd_interactive_authentication == -1) |
options->kbd_interactive_authentication = 0; |
options->kbd_interactive_authentication = 0; |
#ifdef SKEY |
if (options->challenge_reponse_authentication == -1) |
if (options->skey_authentication == -1) |
options->challenge_reponse_authentication = 1; |
options->skey_authentication = 1; |
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#endif |
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if (options->permit_empty_passwd == -1) |
if (options->permit_empty_passwd == -1) |
options->permit_empty_passwd = 0; |
options->permit_empty_passwd = 0; |
if (options->use_login == -1) |
if (options->use_login == -1) |
options->use_login = 0; |
options->use_login = 0; |
if (options->allow_tcp_forwarding == -1) |
if (options->allow_tcp_forwarding == -1) |
options->allow_tcp_forwarding = 1; |
options->allow_tcp_forwarding = 1; |
if (options->protocol == SSH_PROTO_UNKNOWN) |
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options->protocol = SSH_PROTO_1|SSH_PROTO_2; |
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if (options->gateway_ports == -1) |
if (options->gateway_ports == -1) |
options->gateway_ports = 0; |
options->gateway_ports = 0; |
if (options->max_startups == -1) |
if (options->max_startups == -1) |
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options->max_startups_rate = 100; /* 100% */ |
options->max_startups_rate = 100; /* 100% */ |
if (options->max_startups_begin == -1) |
if (options->max_startups_begin == -1) |
options->max_startups_begin = options->max_startups; |
options->max_startups_begin = options->max_startups; |
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if (options->reverse_mapping_check == -1) |
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options->reverse_mapping_check = 0; |
} |
} |
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/* Keyword tokens. */ |
/* Keyword tokens. */ |
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#ifdef AFS |
#ifdef AFS |
sKerberosTgtPassing, sAFSTokenPassing, |
sKerberosTgtPassing, sAFSTokenPassing, |
#endif |
#endif |
#ifdef SKEY |
sChallengeResponseAuthentication, |
sSkeyAuthentication, |
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#endif |
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sPasswordAuthentication, sKbdInteractiveAuthentication, sListenAddress, |
sPasswordAuthentication, sKbdInteractiveAuthentication, sListenAddress, |
sPrintMotd, sIgnoreRhosts, sX11Forwarding, sX11DisplayOffset, |
sPrintMotd, sIgnoreRhosts, sX11Forwarding, sX11DisplayOffset, |
sStrictModes, sEmptyPasswd, sRandomSeedFile, sKeepAlives, sCheckMail, |
sStrictModes, sEmptyPasswd, sRandomSeedFile, sKeepAlives, sCheckMail, |
sUseLogin, sAllowTcpForwarding, |
sUseLogin, sAllowTcpForwarding, |
sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, |
sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups, |
sIgnoreUserKnownHosts, sHostDSAKeyFile, sCiphers, sProtocol, sPidFile, |
sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile, |
sGatewayPorts, sDSAAuthentication, sXAuthLocation, sSubsystem, sMaxStartups |
sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem, sMaxStartups, |
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sBanner, sReverseMappingCheck |
} ServerOpCodes; |
} ServerOpCodes; |
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/* Textual representation of the tokens. */ |
/* Textual representation of the tokens. */ |
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} keywords[] = { |
} keywords[] = { |
{ "port", sPort }, |
{ "port", sPort }, |
{ "hostkey", sHostKeyFile }, |
{ "hostkey", sHostKeyFile }, |
{ "hostdsakey", sHostDSAKeyFile }, |
{ "hostdsakey", sHostKeyFile }, /* alias */ |
{ "pidfile", sPidFile }, |
{ "pidfile", sPidFile }, |
{ "serverkeybits", sServerKeyBits }, |
{ "serverkeybits", sServerKeyBits }, |
{ "logingracetime", sLoginGraceTime }, |
{ "logingracetime", sLoginGraceTime }, |
{ "keyregenerationinterval", sKeyRegenerationTime }, |
{ "keyregenerationinterval", sKeyRegenerationTime }, |
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{ "rhostsauthentication", sRhostsAuthentication }, |
{ "rhostsauthentication", sRhostsAuthentication }, |
{ "rhostsrsaauthentication", sRhostsRSAAuthentication }, |
{ "rhostsrsaauthentication", sRhostsRSAAuthentication }, |
{ "rsaauthentication", sRSAAuthentication }, |
{ "rsaauthentication", sRSAAuthentication }, |
{ "dsaauthentication", sDSAAuthentication }, |
{ "pubkeyauthentication", sPubkeyAuthentication }, |
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{ "dsaauthentication", sPubkeyAuthentication }, /* alias */ |
#ifdef KRB4 |
#ifdef KRB4 |
{ "kerberosauthentication", sKerberosAuthentication }, |
{ "kerberosauthentication", sKerberosAuthentication }, |
{ "kerberosorlocalpasswd", sKerberosOrLocalPasswd }, |
{ "kerberosorlocalpasswd", sKerberosOrLocalPasswd }, |
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#endif |
#endif |
{ "passwordauthentication", sPasswordAuthentication }, |
{ "passwordauthentication", sPasswordAuthentication }, |
{ "kbdinteractiveauthentication", sKbdInteractiveAuthentication }, |
{ "kbdinteractiveauthentication", sKbdInteractiveAuthentication }, |
#ifdef SKEY |
{ "challengeresponseauthentication", sChallengeResponseAuthentication }, |
{ "skeyauthentication", sSkeyAuthentication }, |
{ "skeyauthentication", sChallengeResponseAuthentication }, /* alias */ |
#endif |
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{ "checkmail", sCheckMail }, |
{ "checkmail", sCheckMail }, |
{ "listenaddress", sListenAddress }, |
{ "listenaddress", sListenAddress }, |
{ "printmotd", sPrintMotd }, |
{ "printmotd", sPrintMotd }, |
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{ "allowgroups", sAllowGroups }, |
{ "allowgroups", sAllowGroups }, |
{ "denygroups", sDenyGroups }, |
{ "denygroups", sDenyGroups }, |
{ "ciphers", sCiphers }, |
{ "ciphers", sCiphers }, |
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{ "macs", sMacs }, |
{ "protocol", sProtocol }, |
{ "protocol", sProtocol }, |
{ "gatewayports", sGatewayPorts }, |
{ "gatewayports", sGatewayPorts }, |
{ "subsystem", sSubsystem }, |
{ "subsystem", sSubsystem }, |
{ "maxstartups", sMaxStartups }, |
{ "maxstartups", sMaxStartups }, |
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{ "banner", sBanner }, |
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{ "reversemappingcheck", sReverseMappingCheck }, |
{ NULL, 0 } |
{ NULL, 0 } |
}; |
}; |
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parse_token(const char *cp, const char *filename, |
parse_token(const char *cp, const char *filename, |
int linenum) |
int linenum) |
{ |
{ |
unsigned int i; |
u_int i; |
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for (i = 0; keywords[i].name; i++) |
for (i = 0; keywords[i].name; i++) |
if (strcasecmp(cp, keywords[i].name) == 0) |
if (strcasecmp(cp, keywords[i].name) == 0) |
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void |
void |
add_listen_addr(ServerOptions *options, char *addr) |
add_listen_addr(ServerOptions *options, char *addr) |
{ |
{ |
extern int IPv4or6; |
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struct addrinfo hints, *ai, *aitop; |
struct addrinfo hints, *ai, *aitop; |
char strport[NI_MAXSERV]; |
char strport[NI_MAXSERV]; |
int gaierr; |
int gaierr; |
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/* Ignore leading whitespace */ |
/* Ignore leading whitespace */ |
if (*arg == '\0') |
if (*arg == '\0') |
arg = strdelim(&cp); |
arg = strdelim(&cp); |
if (!*arg || *arg == '#') |
if (!arg || !*arg || *arg == '#') |
continue; |
continue; |
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intptr = NULL; |
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charptr = NULL; |
opcode = parse_token(arg, filename, linenum); |
opcode = parse_token(arg, filename, linenum); |
switch (opcode) { |
switch (opcode) { |
case sBadOption: |
case sBadOption: |
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break; |
break; |
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case sHostKeyFile: |
case sHostKeyFile: |
case sHostDSAKeyFile: |
intptr = &options->num_host_key_files; |
charptr = (opcode == sHostKeyFile ) ? |
if (*intptr >= MAX_HOSTKEYS) { |
&options->host_key_file : &options->host_dsa_key_file; |
fprintf(stderr, "%s line %d: to many host keys specified (max %d).\n", |
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filename, linenum, MAX_HOSTKEYS); |
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exit(1); |
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} |
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charptr = &options->host_key_files[*intptr]; |
parse_filename: |
parse_filename: |
arg = strdelim(&cp); |
arg = strdelim(&cp); |
if (!arg || *arg == '\0') { |
if (!arg || *arg == '\0') { |
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filename, linenum); |
filename, linenum); |
exit(1); |
exit(1); |
} |
} |
if (*charptr == NULL) |
if (*charptr == NULL) { |
*charptr = tilde_expand_filename(arg, getuid()); |
*charptr = tilde_expand_filename(arg, getuid()); |
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/* increase optional counter */ |
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if (intptr != NULL) |
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*intptr = *intptr + 1; |
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} |
break; |
break; |
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case sPidFile: |
case sPidFile: |
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exit(1); |
exit(1); |
} |
} |
if (strcmp(arg, "without-password") == 0) |
if (strcmp(arg, "without-password") == 0) |
value = 2; |
value = PERMIT_NO_PASSWD; |
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else if (strcmp(arg, "forced-commands-only") == 0) |
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value = PERMIT_FORCED_ONLY; |
else if (strcmp(arg, "yes") == 0) |
else if (strcmp(arg, "yes") == 0) |
value = 1; |
value = PERMIT_YES; |
else if (strcmp(arg, "no") == 0) |
else if (strcmp(arg, "no") == 0) |
value = 0; |
value = PERMIT_NO; |
else { |
else { |
fprintf(stderr, "%s line %d: Bad yes/without-password/no argument: %s\n", |
fprintf(stderr, "%s line %d: Bad yes/" |
filename, linenum, arg); |
"without-password/forced-commands-only/no " |
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"argument: %s\n", filename, linenum, arg); |
exit(1); |
exit(1); |
} |
} |
if (*intptr == -1) |
if (*intptr == -1) |
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intptr = &options->rsa_authentication; |
intptr = &options->rsa_authentication; |
goto parse_flag; |
goto parse_flag; |
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case sDSAAuthentication: |
case sPubkeyAuthentication: |
intptr = &options->dsa_authentication; |
intptr = &options->pubkey_authentication; |
goto parse_flag; |
goto parse_flag; |
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#ifdef KRB4 |
#ifdef KRB4 |
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intptr = &options->check_mail; |
intptr = &options->check_mail; |
goto parse_flag; |
goto parse_flag; |
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#ifdef SKEY |
case sChallengeResponseAuthentication: |
case sSkeyAuthentication: |
intptr = &options->challenge_reponse_authentication; |
intptr = &options->skey_authentication; |
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goto parse_flag; |
goto parse_flag; |
#endif |
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case sPrintMotd: |
case sPrintMotd: |
intptr = &options->print_motd; |
intptr = &options->print_motd; |
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case sXAuthLocation: |
case sXAuthLocation: |
charptr = &options->xauth_location; |
charptr = &options->xauth_location; |
goto parse_filename; |
goto parse_filename; |
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case sStrictModes: |
case sStrictModes: |
intptr = &options->strict_modes; |
intptr = &options->strict_modes; |
goto parse_flag; |
goto parse_flag; |
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intptr = &options->gateway_ports; |
intptr = &options->gateway_ports; |
goto parse_flag; |
goto parse_flag; |
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case sReverseMappingCheck: |
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intptr = &options->reverse_mapping_check; |
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goto parse_flag; |
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case sLogFacility: |
case sLogFacility: |
intptr = (int *) &options->log_facility; |
intptr = (int *) &options->log_facility; |
arg = strdelim(&cp); |
arg = strdelim(&cp); |
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options->ciphers = xstrdup(arg); |
options->ciphers = xstrdup(arg); |
break; |
break; |
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case sMacs: |
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arg = strdelim(&cp); |
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if (!arg || *arg == '\0') |
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fatal("%s line %d: Missing argument.", filename, linenum); |
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if (!mac_valid(arg)) |
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fatal("%s line %d: Bad SSH2 mac spec '%s'.", |
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filename, linenum, arg ? arg : "<NONE>"); |
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if (options->macs == NULL) |
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options->macs = xstrdup(arg); |
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break; |
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case sProtocol: |
case sProtocol: |
intptr = &options->protocol; |
intptr = &options->protocol; |
arg = strdelim(&cp); |
arg = strdelim(&cp); |
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intptr = &options->max_startups; |
intptr = &options->max_startups; |
goto parse_int; |
goto parse_int; |
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case sBanner: |
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charptr = &options->banner; |
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goto parse_filename; |
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default: |
default: |
fprintf(stderr, "%s line %d: Missing handler for opcode %s (%d)\n", |
fprintf(stderr, "%s line %d: Missing handler for opcode %s (%d)\n", |
filename, linenum, arg, opcode); |
filename, linenum, arg, opcode); |
exit(1); |
exit(1); |
} |
} |
if ((arg = strdelim(&cp)) != NULL && *arg != '\0') { |
if ((arg = strdelim(&cp)) != NULL && *arg != '\0') { |
fprintf(stderr, |
fprintf(stderr, |
"%s line %d: garbage at end of line; \"%.200s\".\n", |
"%s line %d: garbage at end of line; \"%.200s\".\n", |
filename, linenum, arg); |
filename, linenum, arg); |
exit(1); |
exit(1); |