696 lines
17 KiB
C
696 lines
17 KiB
C
/*
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* WPA Supplicant / Configuration backend: text file
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* Copyright (c) 2003-2006, Jouni Malinen <jkmaline@cc.hut.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*
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* This file implements a configuration backend for text files. All the
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* configuration information is stored in a text file that uses a format
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* described in the sample configuration file, wpa_supplicant.conf.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "common.h"
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#include "wpa.h"
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#include "wpa_supplicant.h"
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#include "config.h"
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#include "base64.h"
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static char * wpa_config_get_line(char *s, int size, FILE *stream, int *line)
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{
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char *pos, *end, *sstart;
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while (fgets(s, size, stream)) {
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(*line)++;
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s[size - 1] = '\0';
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pos = s;
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while (*pos == ' ' || *pos == '\t' || *pos == '\r')
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pos++;
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if (*pos == '#' || *pos == '\n' || *pos == '\0' ||
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*pos == '\r')
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continue;
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/* Remove # comments unless they are within a double quoted
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* string. Remove trailing white space. */
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sstart = strchr(pos, '"');
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if (sstart)
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sstart = strrchr(sstart + 1, '"');
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if (!sstart)
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sstart = pos;
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end = strchr(sstart, '#');
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if (end)
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*end-- = '\0';
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else
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end = pos + strlen(pos) - 1;
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while (end > pos &&
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(*end == '\n' || *end == ' ' || *end == '\t' ||
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*end == '\r')) {
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*end-- = '\0';
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}
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if (*pos == '\0')
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continue;
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return pos;
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}
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return NULL;
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}
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static struct wpa_ssid * wpa_config_read_network(FILE *f, int *line, int id)
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{
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struct wpa_ssid *ssid;
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int errors = 0, end = 0;
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char buf[256], *pos, *pos2;
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wpa_printf(MSG_MSGDUMP, "Line: %d - start of a new network block",
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*line);
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ssid = (struct wpa_ssid *) malloc(sizeof(*ssid));
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if (ssid == NULL)
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return NULL;
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memset(ssid, 0, sizeof(*ssid));
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ssid->id = id;
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wpa_config_set_network_defaults(ssid);
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while ((pos = wpa_config_get_line(buf, sizeof(buf), f, line))) {
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if (strcmp(pos, "}") == 0) {
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end = 1;
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break;
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}
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pos2 = strchr(pos, '=');
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if (pos2 == NULL) {
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wpa_printf(MSG_ERROR, "Line %d: Invalid SSID line "
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"'%s'.", *line, pos);
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errors++;
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continue;
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}
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*pos2++ = '\0';
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if (*pos2 == '"') {
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if (strchr(pos2 + 1, '"') == NULL) {
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wpa_printf(MSG_ERROR, "Line %d: invalid "
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"quotation '%s'.", *line, pos2);
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errors++;
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continue;
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}
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}
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if (wpa_config_set(ssid, pos, pos2, *line) < 0)
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errors++;
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}
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if (!end) {
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wpa_printf(MSG_ERROR, "Line %d: network block was not "
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"terminated properly.", *line);
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errors++;
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}
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if (ssid->passphrase) {
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if (ssid->psk_set) {
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wpa_printf(MSG_ERROR, "Line %d: both PSK and "
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"passphrase configured.", *line);
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errors++;
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}
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wpa_config_update_psk(ssid);
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}
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if ((ssid->key_mgmt & WPA_KEY_MGMT_PSK) && !ssid->psk_set) {
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wpa_printf(MSG_ERROR, "Line %d: WPA-PSK accepted for key "
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"management, but no PSK configured.", *line);
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errors++;
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}
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if ((ssid->group_cipher & WPA_CIPHER_CCMP) &&
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!(ssid->pairwise_cipher & WPA_CIPHER_CCMP)) {
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/* Group cipher cannot be stronger than the pairwise cipher. */
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wpa_printf(MSG_DEBUG, "Line %d: removed CCMP from group cipher"
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" list since it was not allowed for pairwise "
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"cipher", *line);
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ssid->group_cipher &= ~WPA_CIPHER_CCMP;
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}
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if (errors) {
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wpa_config_free_ssid(ssid);
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ssid = NULL;
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}
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return ssid;
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}
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static struct wpa_config_blob * wpa_config_read_blob(FILE *f, int *line,
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const char *name)
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{
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struct wpa_config_blob *blob;
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char buf[256], *pos;
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unsigned char *encoded = NULL, *nencoded;
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int end = 0;
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size_t encoded_len = 0, len;
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wpa_printf(MSG_MSGDUMP, "Line: %d - start of a new named blob '%s'",
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*line, name);
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while ((pos = wpa_config_get_line(buf, sizeof(buf), f, line))) {
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if (strcmp(pos, "}") == 0) {
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end = 1;
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break;
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}
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len = strlen(pos);
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nencoded = realloc(encoded, encoded_len + len);
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if (nencoded == NULL) {
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wpa_printf(MSG_ERROR, "Line %d: not enough memory for "
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"blob", *line);
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free(encoded);
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return NULL;
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}
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encoded = nencoded;
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memcpy(encoded + encoded_len, pos, len);
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encoded_len += len;
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}
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if (!end) {
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wpa_printf(MSG_ERROR, "Line %d: blob was not terminated "
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"properly", *line);
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free(encoded);
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return NULL;
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}
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blob = malloc(sizeof(*blob));
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if (blob == NULL) {
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free(encoded);
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return NULL;
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}
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memset(blob, 0, sizeof(*blob));
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blob->name = strdup(name);
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blob->data = base64_decode(encoded, encoded_len, &blob->len);
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free(encoded);
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if (blob->name == NULL || blob->data == NULL) {
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wpa_config_free_blob(blob);
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return NULL;
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}
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return blob;
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}
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struct wpa_config * wpa_config_read(const char *name)
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{
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FILE *f;
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char buf[256], *pos;
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int errors = 0, line = 0;
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struct wpa_ssid *ssid, *tail = NULL, *head = NULL;
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struct wpa_config *config;
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int id = 0, prio;
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config = wpa_config_alloc_empty(NULL, NULL);
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if (config == NULL)
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return NULL;
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wpa_printf(MSG_DEBUG, "Reading configuration file '%s'", name);
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f = fopen(name, "r");
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if (f == NULL) {
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free(config);
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return NULL;
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}
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while ((pos = wpa_config_get_line(buf, sizeof(buf), f, &line))) {
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if (strcmp(pos, "network={") == 0) {
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ssid = wpa_config_read_network(f, &line, id++);
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if (ssid == NULL) {
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wpa_printf(MSG_ERROR, "Line %d: failed to "
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"parse network block.", line);
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errors++;
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continue;
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}
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if (head == NULL) {
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head = tail = ssid;
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} else {
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tail->next = ssid;
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tail = ssid;
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}
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if (wpa_config_add_prio_network(config, ssid)) {
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wpa_printf(MSG_ERROR, "Line %d: failed to add "
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"network block to priority list.",
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line);
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errors++;
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continue;
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}
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} else if (strncmp(pos, "blob-base64-", 12) == 0) {
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char *name = pos + 12, *name_end;
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struct wpa_config_blob *blob;
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name_end = strchr(name, '=');
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if (name_end == NULL) {
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wpa_printf(MSG_ERROR, "Line %d: no blob name "
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"terminator", line);
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errors++;
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continue;
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}
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*name_end = '\0';
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blob = wpa_config_read_blob(f, &line, name);
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if (blob == NULL) {
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wpa_printf(MSG_ERROR, "Line %d: failed to read"
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" blob %s", line, name);
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errors++;
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continue;
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}
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wpa_config_set_blob(config, blob);
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#ifdef CONFIG_CTRL_IFACE
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} else if (strncmp(pos, "ctrl_interface=", 15) == 0) {
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free(config->ctrl_interface);
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config->ctrl_interface = strdup(pos + 15);
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wpa_printf(MSG_DEBUG, "ctrl_interface='%s'",
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config->ctrl_interface);
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#ifndef CONFIG_CTRL_IFACE_UDP
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} else if (strncmp(pos, "ctrl_interface_group=", 21) == 0) {
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struct group *grp;
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char *endp;
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const char *group = pos + 21;
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grp = getgrnam(group);
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if (grp) {
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config->ctrl_interface_gid = grp->gr_gid;
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config->ctrl_interface_gid_set = 1;
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wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d"
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" (from group name '%s')",
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(int) config->ctrl_interface_gid,
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group);
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continue;
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}
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/* Group name not found - try to parse this as gid */
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config->ctrl_interface_gid = strtol(group, &endp, 10);
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if (*group == '\0' || *endp != '\0') {
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wpa_printf(MSG_DEBUG, "Line %d: Invalid group "
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"'%s'", line, group);
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errors++;
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continue;
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}
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config->ctrl_interface_gid_set = 1;
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wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
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(int) config->ctrl_interface_gid);
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#endif /* CONFIG_CTRL_IFACE_UDP */
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#endif /* CONFIG_CTRL_IFACE */
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} else if (strncmp(pos, "eapol_version=", 14) == 0) {
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config->eapol_version = atoi(pos + 14);
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if (config->eapol_version < 1 ||
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config->eapol_version > 2) {
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wpa_printf(MSG_ERROR, "Line %d: Invalid EAPOL "
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"version (%d): '%s'.",
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line, config->eapol_version, pos);
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errors++;
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continue;
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}
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wpa_printf(MSG_DEBUG, "eapol_version=%d",
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config->eapol_version);
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} else if (strncmp(pos, "ap_scan=", 8) == 0) {
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config->ap_scan = atoi(pos + 8);
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wpa_printf(MSG_DEBUG, "ap_scan=%d", config->ap_scan);
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} else if (strncmp(pos, "fast_reauth=", 12) == 0) {
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config->fast_reauth = atoi(pos + 12);
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wpa_printf(MSG_DEBUG, "fast_reauth=%d",
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config->fast_reauth);
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} else if (strncmp(pos, "opensc_engine_path=", 19) == 0) {
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free(config->opensc_engine_path);
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config->opensc_engine_path = strdup(pos + 19);
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wpa_printf(MSG_DEBUG, "opensc_engine_path='%s'",
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config->opensc_engine_path);
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} else if (strncmp(pos, "pkcs11_engine_path=", 19) == 0) {
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free(config->pkcs11_engine_path);
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config->pkcs11_engine_path = strdup(pos + 19);
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wpa_printf(MSG_DEBUG, "pkcs11_engine_path='%s'",
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config->pkcs11_engine_path);
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} else if (strncmp(pos, "pkcs11_module_path=", 19) == 0) {
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free(config->pkcs11_module_path);
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config->pkcs11_module_path = strdup(pos + 19);
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wpa_printf(MSG_DEBUG, "pkcs11_module_path='%s'",
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config->pkcs11_module_path);
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} else if (strncmp(pos, "driver_param=", 13) == 0) {
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free(config->driver_param);
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config->driver_param = strdup(pos + 13);
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wpa_printf(MSG_DEBUG, "driver_param='%s'",
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config->driver_param);
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} else if (strncmp(pos, "dot11RSNAConfigPMKLifetime=", 27) ==
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0) {
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config->dot11RSNAConfigPMKLifetime = atoi(pos + 27);
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wpa_printf(MSG_DEBUG, "dot11RSNAConfigPMKLifetime=%d",
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config->dot11RSNAConfigPMKLifetime);
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} else if (strncmp(pos, "dot11RSNAConfigPMKReauthThreshold=",
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34) ==
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0) {
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config->dot11RSNAConfigPMKReauthThreshold =
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atoi(pos + 34);
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wpa_printf(MSG_DEBUG,
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"dot11RSNAConfigPMKReauthThreshold=%d",
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config->dot11RSNAConfigPMKReauthThreshold);
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} else if (strncmp(pos, "dot11RSNAConfigSATimeout=", 25) ==
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0) {
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config->dot11RSNAConfigSATimeout = atoi(pos + 25);
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wpa_printf(MSG_DEBUG, "dot11RSNAConfigSATimeout=%d",
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config->dot11RSNAConfigSATimeout);
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} else if (strncmp(pos, "update_config=", 14) == 0) {
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config->update_config = atoi(pos + 14);
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wpa_printf(MSG_DEBUG, "update_config=%d",
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config->update_config);
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} else {
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wpa_printf(MSG_ERROR, "Line %d: Invalid configuration "
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"line '%s'.", line, pos);
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errors++;
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continue;
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}
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}
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fclose(f);
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config->ssid = head;
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for (prio = 0; prio < config->num_prio; prio++) {
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ssid = config->pssid[prio];
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wpa_printf(MSG_DEBUG, "Priority group %d",
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ssid->priority);
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while (ssid) {
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wpa_printf(MSG_DEBUG, " id=%d ssid='%s'",
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ssid->id,
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wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
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ssid = ssid->pnext;
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}
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}
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if (errors) {
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wpa_config_free(config);
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config = NULL;
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head = NULL;
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}
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return config;
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}
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static void write_str(FILE *f, const char *field, struct wpa_ssid *ssid)
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{
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char *value = wpa_config_get(ssid, field);
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if (value == NULL)
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return;
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fprintf(f, "\t%s=%s\n", field, value);
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free(value);
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}
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static void write_int(FILE *f, const char *field, int value, int def)
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{
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if (value == def)
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return;
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fprintf(f, "\t%s=%d\n", field, value);
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}
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static void write_bssid(FILE *f, struct wpa_ssid *ssid)
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{
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char *value = wpa_config_get(ssid, "bssid");
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if (value == NULL)
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return;
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fprintf(f, "\tbssid=%s\n", value);
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free(value);
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}
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static void write_psk(FILE *f, struct wpa_ssid *ssid)
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{
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char *value = wpa_config_get(ssid, "psk");
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if (value == NULL)
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return;
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fprintf(f, "\tpsk=%s\n", value);
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free(value);
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}
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static void write_proto(FILE *f, struct wpa_ssid *ssid)
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{
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char *value;
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if (ssid->proto == DEFAULT_PROTO)
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return;
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value = wpa_config_get(ssid, "proto");
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if (value == NULL)
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return;
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if (value[0])
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fprintf(f, "\tproto=%s\n", value);
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free(value);
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}
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static void write_key_mgmt(FILE *f, struct wpa_ssid *ssid)
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{
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char *value;
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if (ssid->key_mgmt == DEFAULT_KEY_MGMT)
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return;
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value = wpa_config_get(ssid, "key_mgmt");
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if (value == NULL)
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return;
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if (value[0])
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fprintf(f, "\tkey_mgmt=%s\n", value);
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free(value);
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}
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static void write_pairwise(FILE *f, struct wpa_ssid *ssid)
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{
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char *value;
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if (ssid->pairwise_cipher == DEFAULT_PAIRWISE)
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return;
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value = wpa_config_get(ssid, "pairwise");
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if (value == NULL)
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return;
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if (value[0])
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fprintf(f, "\tpairwise=%s\n", value);
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free(value);
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}
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static void write_group(FILE *f, struct wpa_ssid *ssid)
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{
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char *value;
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if (ssid->group_cipher == DEFAULT_GROUP)
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return;
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value = wpa_config_get(ssid, "group");
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if (value == NULL)
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return;
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if (value[0])
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fprintf(f, "\tgroup=%s\n", value);
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free(value);
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}
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static void write_auth_alg(FILE *f, struct wpa_ssid *ssid)
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{
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char *value;
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if (ssid->auth_alg == 0)
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return;
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value = wpa_config_get(ssid, "auth_alg");
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if (value == NULL)
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return;
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if (value[0])
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fprintf(f, "\tauth_alg=%s\n", value);
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free(value);
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}
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|
|
|
|
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);
|
|
free(value);
|
|
}
|
|
|
|
|
|
static void write_wep_key(FILE *f, int idx, struct wpa_ssid *ssid)
|
|
{
|
|
char field[20], *value;
|
|
|
|
snprintf(field, sizeof(field), "wep_key%d", idx);
|
|
value = wpa_config_get(ssid, field);
|
|
if (value) {
|
|
fprintf(f, "\t%s=%s\n", field, value);
|
|
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);
|
|
write_eap(f, ssid);
|
|
STR(identity);
|
|
STR(anonymous_identity);
|
|
STR(eappsk);
|
|
STR(nai);
|
|
STR(password);
|
|
STR(ca_cert);
|
|
STR(client_cert);
|
|
STR(private_key);
|
|
STR(private_key_passwd);
|
|
STR(dh_file);
|
|
STR(subject_match);
|
|
STR(altsubject_match);
|
|
STR(ca_cert2);
|
|
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);
|
|
for (i = 0; i < 4; i++)
|
|
write_wep_key(f, i, ssid);
|
|
INT(wep_tx_keyidx);
|
|
INT(priority);
|
|
INT_DEF(eap_workaround, DEFAULT_EAP_WORKAROUND);
|
|
STR(pac_file);
|
|
INT(mode);
|
|
INT(proactive_key_caching);
|
|
INT(disabled);
|
|
|
|
#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);
|
|
free(encoded);
|
|
return 0;
|
|
}
|
|
|
|
|
|
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;
|
|
}
|
|
|
|
#ifdef CONFIG_CTRL_IFACE
|
|
if (config->ctrl_interface)
|
|
fprintf(f, "ctrl_interface=%s\n", config->ctrl_interface);
|
|
#ifndef CONFIG_CTRL_IFACE_UDP
|
|
if (config->ctrl_interface_gid_set) {
|
|
fprintf(f, "ctrl_interface_group=%d\n",
|
|
(int) config->ctrl_interface_gid);
|
|
}
|
|
#endif /* CONFIG_CTRL_IFACE_UDP */
|
|
#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);
|
|
|
|
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;
|
|
}
|