freebsd-dev/contrib/wpa_supplicant/config_file.c
2007-07-11 15:48:36 +00:00

725 lines
18 KiB
C

/*
* WPA Supplicant / Configuration backend: text file
* Copyright (c) 2003-2006, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*
* This file implements a configuration backend for text files. All the
* configuration information is stored in a text file that uses a format
* described in the sample configuration file, wpa_supplicant.conf.
*/
#include "includes.h"
#include "common.h"
#include "config.h"
#include "base64.h"
#include "eap_methods.h"
/**
* wpa_config_get_line - Read the next configuration file line
* @s: Buffer for the line
* @size: The buffer length
* @stream: File stream to read from
* @line: Pointer to a variable storing the file line number
* @_pos: Buffer for the pointer to the beginning of data on the text line or
* %NULL if not needed (returned value used instead)
* Returns: Pointer to the beginning of data on the text line or %NULL if no
* more text lines are available.
*
* This function reads the next non-empty line from the configuration file and
* removes comments. The returned string is guaranteed to be null-terminated.
*/
static char * wpa_config_get_line(char *s, int size, FILE *stream, int *line,
char **_pos)
{
char *pos, *end, *sstart;
while (fgets(s, size, stream)) {
(*line)++;
s[size - 1] = '\0';
pos = s;
/* Skip white space from the beginning of line. */
while (*pos == ' ' || *pos == '\t' || *pos == '\r')
pos++;
/* Skip comment lines and empty lines */
if (*pos == '#' || *pos == '\n' || *pos == '\0')
continue;
/*
* Remove # comments unless they are within a double quoted
* string.
*/
sstart = os_strchr(pos, '"');
if (sstart)
sstart = os_strrchr(sstart + 1, '"');
if (!sstart)
sstart = pos;
end = os_strchr(sstart, '#');
if (end)
*end-- = '\0';
else
end = pos + os_strlen(pos) - 1;
/* Remove trailing white space. */
while (end > pos &&
(*end == '\n' || *end == ' ' || *end == '\t' ||
*end == '\r'))
*end-- = '\0';
if (*pos == '\0')
continue;
if (_pos)
*_pos = pos;
return pos;
}
if (_pos)
*_pos = NULL;
return NULL;
}
static int wpa_config_validate_network(struct wpa_ssid *ssid, int line)
{
int errors = 0;
if (ssid->passphrase) {
if (ssid->psk_set) {
wpa_printf(MSG_ERROR, "Line %d: both PSK and "
"passphrase configured.", line);
errors++;
}
wpa_config_update_psk(ssid);
}
if ((ssid->key_mgmt & WPA_KEY_MGMT_PSK) && !ssid->psk_set) {
wpa_printf(MSG_ERROR, "Line %d: WPA-PSK accepted for key "
"management, but no PSK configured.", line);
errors++;
}
if ((ssid->group_cipher & WPA_CIPHER_CCMP) &&
!(ssid->pairwise_cipher & WPA_CIPHER_CCMP) &&
!(ssid->pairwise_cipher & WPA_CIPHER_NONE)) {
/* Group cipher cannot be stronger than the pairwise cipher. */
wpa_printf(MSG_DEBUG, "Line %d: removed CCMP from group cipher"
" list since it was not allowed for pairwise "
"cipher", line);
ssid->group_cipher &= ~WPA_CIPHER_CCMP;
}
return errors;
}
static struct wpa_ssid * wpa_config_read_network(FILE *f, int *line, int id)
{
struct wpa_ssid *ssid;
int errors = 0, end = 0;
char buf[256], *pos, *pos2;
wpa_printf(MSG_MSGDUMP, "Line: %d - start of a new network block",
*line);
ssid = os_zalloc(sizeof(*ssid));
if (ssid == NULL)
return NULL;
ssid->id = id;
wpa_config_set_network_defaults(ssid);
while (wpa_config_get_line(buf, sizeof(buf), f, line, &pos)) {
if (os_strcmp(pos, "}") == 0) {
end = 1;
break;
}
pos2 = os_strchr(pos, '=');
if (pos2 == NULL) {
wpa_printf(MSG_ERROR, "Line %d: Invalid SSID line "
"'%s'.", *line, pos);
errors++;
continue;
}
*pos2++ = '\0';
if (*pos2 == '"') {
if (os_strchr(pos2 + 1, '"') == NULL) {
wpa_printf(MSG_ERROR, "Line %d: invalid "
"quotation '%s'.", *line, pos2);
errors++;
continue;
}
}
if (wpa_config_set(ssid, pos, pos2, *line) < 0)
errors++;
}
if (!end) {
wpa_printf(MSG_ERROR, "Line %d: network block was not "
"terminated properly.", *line);
errors++;
}
errors += wpa_config_validate_network(ssid, *line);
if (errors) {
wpa_config_free_ssid(ssid);
ssid = NULL;
}
return ssid;
}
static struct wpa_config_blob * wpa_config_read_blob(FILE *f, int *line,
const char *name)
{
struct wpa_config_blob *blob;
char buf[256], *pos;
unsigned char *encoded = NULL, *nencoded;
int end = 0;
size_t encoded_len = 0, len;
wpa_printf(MSG_MSGDUMP, "Line: %d - start of a new named blob '%s'",
*line, name);
while (wpa_config_get_line(buf, sizeof(buf), f, line, &pos)) {
if (os_strcmp(pos, "}") == 0) {
end = 1;
break;
}
len = os_strlen(pos);
nencoded = os_realloc(encoded, encoded_len + len);
if (nencoded == NULL) {
wpa_printf(MSG_ERROR, "Line %d: not enough memory for "
"blob", *line);
os_free(encoded);
return NULL;
}
encoded = nencoded;
os_memcpy(encoded + encoded_len, pos, len);
encoded_len += len;
}
if (!end) {
wpa_printf(MSG_ERROR, "Line %d: blob was not terminated "
"properly", *line);
os_free(encoded);
return NULL;
}
blob = os_zalloc(sizeof(*blob));
if (blob == NULL) {
os_free(encoded);
return NULL;
}
blob->name = os_strdup(name);
blob->data = base64_decode(encoded, encoded_len, &blob->len);
os_free(encoded);
if (blob->name == NULL || blob->data == NULL) {
wpa_config_free_blob(blob);
return NULL;
}
return blob;
}
struct wpa_config * wpa_config_read(const char *name)
{
FILE *f;
char buf[256], *pos;
int errors = 0, line = 0;
struct wpa_ssid *ssid, *tail = NULL, *head = NULL;
struct wpa_config *config;
int id = 0;
config = wpa_config_alloc_empty(NULL, NULL);
if (config == NULL)
return NULL;
wpa_printf(MSG_DEBUG, "Reading configuration file '%s'", name);
f = fopen(name, "r");
if (f == NULL) {
os_free(config);
return NULL;
}
while (wpa_config_get_line(buf, sizeof(buf), f, &line, &pos)) {
if (os_strcmp(pos, "network={") == 0) {
ssid = wpa_config_read_network(f, &line, id++);
if (ssid == NULL) {
wpa_printf(MSG_ERROR, "Line %d: failed to "
"parse network block.", line);
errors++;
continue;
}
if (head == NULL) {
head = tail = ssid;
} else {
tail->next = ssid;
tail = ssid;
}
if (wpa_config_add_prio_network(config, ssid)) {
wpa_printf(MSG_ERROR, "Line %d: failed to add "
"network block to priority list.",
line);
errors++;
continue;
}
} else if (os_strncmp(pos, "blob-base64-", 12) == 0) {
char *bname = pos + 12, *name_end;
struct wpa_config_blob *blob;
name_end = os_strchr(bname, '=');
if (name_end == NULL) {
wpa_printf(MSG_ERROR, "Line %d: no blob name "
"terminator", line);
errors++;
continue;
}
*name_end = '\0';
blob = wpa_config_read_blob(f, &line, bname);
if (blob == NULL) {
wpa_printf(MSG_ERROR, "Line %d: failed to read"
" blob %s", line, bname);
errors++;
continue;
}
wpa_config_set_blob(config, blob);
#ifdef CONFIG_CTRL_IFACE
} else if (os_strncmp(pos, "ctrl_interface=", 15) == 0) {
os_free(config->ctrl_interface);
config->ctrl_interface = os_strdup(pos + 15);
wpa_printf(MSG_DEBUG, "ctrl_interface='%s'",
config->ctrl_interface);
} else if (os_strncmp(pos, "ctrl_interface_group=", 21) == 0) {
os_free(config->ctrl_interface_group);
config->ctrl_interface_group = os_strdup(pos + 21);
wpa_printf(MSG_DEBUG, "ctrl_interface_group='%s' "
"(DEPRECATED)",
config->ctrl_interface_group);
#endif /* CONFIG_CTRL_IFACE */
} else if (os_strncmp(pos, "eapol_version=", 14) == 0) {
config->eapol_version = atoi(pos + 14);
if (config->eapol_version < 1 ||
config->eapol_version > 2) {
wpa_printf(MSG_ERROR, "Line %d: Invalid EAPOL "
"version (%d): '%s'.",
line, config->eapol_version, pos);
errors++;
continue;
}
wpa_printf(MSG_DEBUG, "eapol_version=%d",
config->eapol_version);
} else if (os_strncmp(pos, "ap_scan=", 8) == 0) {
config->ap_scan = atoi(pos + 8);
wpa_printf(MSG_DEBUG, "ap_scan=%d", config->ap_scan);
} else if (os_strncmp(pos, "fast_reauth=", 12) == 0) {
config->fast_reauth = atoi(pos + 12);
wpa_printf(MSG_DEBUG, "fast_reauth=%d",
config->fast_reauth);
} else if (os_strncmp(pos, "opensc_engine_path=", 19) == 0) {
os_free(config->opensc_engine_path);
config->opensc_engine_path = os_strdup(pos + 19);
wpa_printf(MSG_DEBUG, "opensc_engine_path='%s'",
config->opensc_engine_path);
} else if (os_strncmp(pos, "pkcs11_engine_path=", 19) == 0) {
os_free(config->pkcs11_engine_path);
config->pkcs11_engine_path = os_strdup(pos + 19);
wpa_printf(MSG_DEBUG, "pkcs11_engine_path='%s'",
config->pkcs11_engine_path);
} else if (os_strncmp(pos, "pkcs11_module_path=", 19) == 0) {
os_free(config->pkcs11_module_path);
config->pkcs11_module_path = os_strdup(pos + 19);
wpa_printf(MSG_DEBUG, "pkcs11_module_path='%s'",
config->pkcs11_module_path);
} else if (os_strncmp(pos, "driver_param=", 13) == 0) {
os_free(config->driver_param);
config->driver_param = os_strdup(pos + 13);
wpa_printf(MSG_DEBUG, "driver_param='%s'",
config->driver_param);
} else if (os_strncmp(pos, "dot11RSNAConfigPMKLifetime=", 27)
== 0) {
config->dot11RSNAConfigPMKLifetime = atoi(pos + 27);
wpa_printf(MSG_DEBUG, "dot11RSNAConfigPMKLifetime=%d",
config->dot11RSNAConfigPMKLifetime);
} else if (os_strncmp(pos,
"dot11RSNAConfigPMKReauthThreshold=", 34)
== 0) {
config->dot11RSNAConfigPMKReauthThreshold =
atoi(pos + 34);
wpa_printf(MSG_DEBUG,
"dot11RSNAConfigPMKReauthThreshold=%d",
config->dot11RSNAConfigPMKReauthThreshold);
} else if (os_strncmp(pos, "dot11RSNAConfigSATimeout=", 25) ==
0) {
config->dot11RSNAConfigSATimeout = atoi(pos + 25);
wpa_printf(MSG_DEBUG, "dot11RSNAConfigSATimeout=%d",
config->dot11RSNAConfigSATimeout);
} else if (os_strncmp(pos, "update_config=", 14) == 0) {
config->update_config = atoi(pos + 14);
wpa_printf(MSG_DEBUG, "update_config=%d",
config->update_config);
} else if (os_strncmp(pos, "load_dynamic_eap=", 17) == 0) {
char *so = pos + 17;
int ret;
wpa_printf(MSG_DEBUG, "load_dynamic_eap=%s", so);
ret = eap_peer_method_load(so);
if (ret == -2) {
wpa_printf(MSG_DEBUG, "This EAP type was "
"already loaded - not reloading.");
} else if (ret) {
wpa_printf(MSG_ERROR, "Line %d: Failed to "
"load dynamic EAP method '%s'.",
line, so);
errors++;
}
} else {
wpa_printf(MSG_ERROR, "Line %d: Invalid configuration "
"line '%s'.", line, pos);
errors++;
continue;
}
}
fclose(f);
config->ssid = head;
wpa_config_debug_dump_networks(config);
if (errors) {
wpa_config_free(config);
config = NULL;
head = NULL;
}
return config;
}
static void write_str(FILE *f, const char *field, struct wpa_ssid *ssid)
{
char *value = wpa_config_get(ssid, field);
if (value == NULL)
return;
fprintf(f, "\t%s=%s\n", field, value);
os_free(value);
}
static void write_int(FILE *f, const char *field, int value, int def)
{
if (value == def)
return;
fprintf(f, "\t%s=%d\n", field, value);
}
static void write_bssid(FILE *f, struct wpa_ssid *ssid)
{
char *value = wpa_config_get(ssid, "bssid");
if (value == NULL)
return;
fprintf(f, "\tbssid=%s\n", value);
os_free(value);
}
static void write_psk(FILE *f, struct wpa_ssid *ssid)
{
char *value = wpa_config_get(ssid, "psk");
if (value == NULL)
return;
fprintf(f, "\tpsk=%s\n", value);
os_free(value);
}
static void write_proto(FILE *f, struct wpa_ssid *ssid)
{
char *value;
if (ssid->proto == DEFAULT_PROTO)
return;
value = wpa_config_get(ssid, "proto");
if (value == NULL)
return;
if (value[0])
fprintf(f, "\tproto=%s\n", value);
os_free(value);
}
static void write_key_mgmt(FILE *f, struct wpa_ssid *ssid)
{
char *value;
if (ssid->key_mgmt == DEFAULT_KEY_MGMT)
return;
value = wpa_config_get(ssid, "key_mgmt");
if (value == NULL)
return;
if (value[0])
fprintf(f, "\tkey_mgmt=%s\n", value);
os_free(value);
}
static void write_pairwise(FILE *f, struct wpa_ssid *ssid)
{
char *value;
if (ssid->pairwise_cipher == DEFAULT_PAIRWISE)
return;
value = wpa_config_get(ssid, "pairwise");
if (value == NULL)
return;
if (value[0])
fprintf(f, "\tpairwise=%s\n", value);
os_free(value);
}
static void write_group(FILE *f, struct wpa_ssid *ssid)
{
char *value;
if (ssid->group_cipher == DEFAULT_GROUP)
return;
value = wpa_config_get(ssid, "group");
if (value == NULL)
return;
if (value[0])
fprintf(f, "\tgroup=%s\n", value);
os_free(value);
}
static void write_auth_alg(FILE *f, struct wpa_ssid *ssid)
{
char *value;
if (ssid->auth_alg == 0)
return;
value = wpa_config_get(ssid, "auth_alg");
if (value == NULL)
return;
if (value[0])
fprintf(f, "\tauth_alg=%s\n", value);
os_free(value);
}
#ifdef IEEE8021X_EAPOL
static void write_eap(FILE *f, struct wpa_ssid *ssid)
{
char *value;
value = wpa_config_get(ssid, "eap");
if (value == NULL)
return;
if (value[0])
fprintf(f, "\teap=%s\n", value);
os_free(value);
}
#endif /* IEEE8021X_EAPOL */
static void write_wep_key(FILE *f, int idx, struct wpa_ssid *ssid)
{
char field[20], *value;
os_snprintf(field, sizeof(field), "wep_key%d", idx);
value = wpa_config_get(ssid, field);
if (value) {
fprintf(f, "\t%s=%s\n", field, value);
os_free(value);
}
}
static void wpa_config_write_network(FILE *f, struct wpa_ssid *ssid)
{
int i;
#define STR(t) write_str(f, #t, ssid)
#define INT(t) write_int(f, #t, ssid->t, 0)
#define INT_DEF(t, def) write_int(f, #t, ssid->t, def)
STR(ssid);
INT(scan_ssid);
write_bssid(f, ssid);
write_psk(f, ssid);
write_proto(f, ssid);
write_key_mgmt(f, ssid);
write_pairwise(f, ssid);
write_group(f, ssid);
write_auth_alg(f, ssid);
#ifdef IEEE8021X_EAPOL
write_eap(f, ssid);
STR(identity);
STR(anonymous_identity);
STR(eappsk);
STR(nai);
STR(password);
STR(ca_cert);
STR(ca_path);
STR(client_cert);
STR(private_key);
STR(private_key_passwd);
STR(dh_file);
STR(subject_match);
STR(altsubject_match);
STR(ca_cert2);
STR(ca_path2);
STR(client_cert2);
STR(private_key2);
STR(private_key2_passwd);
STR(dh_file2);
STR(subject_match2);
STR(altsubject_match2);
STR(phase1);
STR(phase2);
STR(pcsc);
STR(pin);
STR(engine_id);
STR(key_id);
INT(engine);
INT_DEF(eapol_flags, DEFAULT_EAPOL_FLAGS);
#endif /* IEEE8021X_EAPOL */
for (i = 0; i < 4; i++)
write_wep_key(f, i, ssid);
INT(wep_tx_keyidx);
INT(priority);
#ifdef IEEE8021X_EAPOL
INT_DEF(eap_workaround, DEFAULT_EAP_WORKAROUND);
STR(pac_file);
INT_DEF(fragment_size, DEFAULT_FRAGMENT_SIZE);
#endif /* IEEE8021X_EAPOL */
INT(mode);
INT(proactive_key_caching);
INT(disabled);
INT(peerkey);
#ifdef CONFIG_IEEE80211W
INT(ieee80211w);
#endif /* CONFIG_IEEE80211W */
STR(id_str);
#undef STR
#undef INT
#undef INT_DEF
}
static int wpa_config_write_blob(FILE *f, struct wpa_config_blob *blob)
{
unsigned char *encoded;
encoded = base64_encode(blob->data, blob->len, NULL);
if (encoded == NULL)
return -1;
fprintf(f, "\nblob-base64-%s={\n%s}\n", blob->name, encoded);
os_free(encoded);
return 0;
}
static void wpa_config_write_global(FILE *f, struct wpa_config *config)
{
#ifdef CONFIG_CTRL_IFACE
if (config->ctrl_interface)
fprintf(f, "ctrl_interface=%s\n", config->ctrl_interface);
if (config->ctrl_interface_group)
fprintf(f, "ctrl_interface_group=%s\n",
config->ctrl_interface_group);
#endif /* CONFIG_CTRL_IFACE */
if (config->eapol_version != DEFAULT_EAPOL_VERSION)
fprintf(f, "eapol_version=%d\n", config->eapol_version);
if (config->ap_scan != DEFAULT_AP_SCAN)
fprintf(f, "ap_scan=%d\n", config->ap_scan);
if (config->fast_reauth != DEFAULT_FAST_REAUTH)
fprintf(f, "fast_reauth=%d\n", config->fast_reauth);
if (config->opensc_engine_path)
fprintf(f, "opensc_engine_path=%s\n",
config->opensc_engine_path);
if (config->pkcs11_engine_path)
fprintf(f, "pkcs11_engine_path=%s\n",
config->pkcs11_engine_path);
if (config->pkcs11_module_path)
fprintf(f, "pkcs11_module_path=%s\n",
config->pkcs11_module_path);
if (config->driver_param)
fprintf(f, "driver_param=%s\n", config->driver_param);
if (config->dot11RSNAConfigPMKLifetime)
fprintf(f, "dot11RSNAConfigPMKLifetime=%d\n",
config->dot11RSNAConfigPMKLifetime);
if (config->dot11RSNAConfigPMKReauthThreshold)
fprintf(f, "dot11RSNAConfigPMKReauthThreshold=%d\n",
config->dot11RSNAConfigPMKReauthThreshold);
if (config->dot11RSNAConfigSATimeout)
fprintf(f, "dot11RSNAConfigSATimeout=%d\n",
config->dot11RSNAConfigSATimeout);
if (config->update_config)
fprintf(f, "update_config=%d\n", config->update_config);
}
int wpa_config_write(const char *name, struct wpa_config *config)
{
FILE *f;
struct wpa_ssid *ssid;
struct wpa_config_blob *blob;
int ret = 0;
wpa_printf(MSG_DEBUG, "Writing configuration file '%s'", name);
f = fopen(name, "w");
if (f == NULL) {
wpa_printf(MSG_DEBUG, "Failed to open '%s' for writing", name);
return -1;
}
wpa_config_write_global(f, config);
for (ssid = config->ssid; ssid; ssid = ssid->next) {
fprintf(f, "\nnetwork={\n");
wpa_config_write_network(f, ssid);
fprintf(f, "}\n");
}
for (blob = config->blobs; blob; blob = blob->next) {
ret = wpa_config_write_blob(f, blob);
if (ret)
break;
}
fclose(f);
wpa_printf(MSG_DEBUG, "Configuration file '%s' written %ssuccessfully",
name, ret ? "un" : "");
return ret;
}