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authorJouni Malinen <jouni@qca.qualcomm.com>2016-12-12 21:47:04 (GMT)
committerJouni Malinen <j@w1.fi>2016-12-12 21:47:04 (GMT)
commit3459381dd260e15e7bf768a75cb0b799cc1db33a (patch)
treee5bd1c5a685bb51228783637a6ce5a6c46aee4da /wpa_supplicant
parentf0df5afa08fe511a008f6526cb9a5553a0c4852e (diff)
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External persistent storage for PMKSA cache entries
This adds new wpa_supplicant control interface commands PMKSA_GET and PMKSA_ADD that can be used to store PMKSA cache entries in an external persistent storage when terminating a wpa_supplicant process and then restore those entries when starting a new process. The previously added PMKSA-CACHE-ADDED/REMOVED events can be used to help in synchronizing the external storage with the memory-only volatile storage within wpa_supplicant. "PMKSA_GET <network_id>" fetches all stored PMKSA cache entries bound to a specific network profile. The network_id of the current profile is available with the STATUS command (id=<network_id). In addition, the network_id is included in the PMKSA-CACHE-ADDED/REMOVED events. The output of the PMKSA_GET command uses the following format: <BSSID> <PMKID> <PMK> <reauth_time in seconds> <expiration in seconds> <akmp> <opportunistic> For example: 02:00:00:00:03:00 113b8b5dc8eda16594e8274df4caa3d4 355e98681d09e0b69d3a342f96998aa765d10c4459ac592459b5efc6b563eff6 30240 43200 1 0 02:00:00:00:04:00 bbdac8607aaaac28e16aacc9152ffe23 e3dd6adc390e685985e5f40e6fe72df846a0acadc59ba15c208d9cb41732a663 30240 43200 1 0 The PMKSA_GET command uses the following format: <network_id> <BSSID> <PMKID> <PMK> <reauth_time in seconds> <expiration in seconds> <akmp> <opportunistic> (i.e., "PMKSA_ADD <network_id> " prefix followed by a line of PMKSA_GET output data; however, the reauth_time and expiration values need to be updated by decrementing them by number of seconds between the PMKSA_GET and PMKSA_ADD commands) For example: PMKSA_ADD 0 02:00:00:00:03:00 113b8b5dc8eda16594e8274df4caa3d4 355e98681d09e0b69d3a342f96998aa765d10c4459ac592459b5efc6b563eff6 30140 43100 1 0 PMKSA_ADD 0 02:00:00:00:04:00 bbdac8607aaaac28e16aacc9152ffe23 e3dd6adc390e685985e5f40e6fe72df846a0acadc59ba15c208d9cb41732a663 30140 43100 1 0 This functionality is disabled be default and can be enabled with CONFIG_PMKSA_CACHE_EXTERNAL=y build configuration option. It should be noted that this allows any process that has access to the wpa_supplicant control interface to use PMKSA_ADD command to fetch keying material (PMK), so this is for environments in which the control interface access is restricted. Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Diffstat (limited to 'wpa_supplicant')
-rw-r--r--wpa_supplicant/Android.mk4
-rw-r--r--wpa_supplicant/Makefile4
-rw-r--r--wpa_supplicant/android.config5
-rw-r--r--wpa_supplicant/ctrl_iface.c156
-rw-r--r--wpa_supplicant/defconfig5
5 files changed, 174 insertions, 0 deletions
diff --git a/wpa_supplicant/Android.mk b/wpa_supplicant/Android.mk
index 46c99d6..e7b7457 100644
--- a/wpa_supplicant/Android.mk
+++ b/wpa_supplicant/Android.mk
@@ -270,6 +270,10 @@ ifdef CONFIG_PEERKEY
L_CFLAGS += -DCONFIG_PEERKEY
endif
+ifdef CONFIG_PMKSA_CACHE_EXTERNAL
+L_CFLAGS += -DCONFIG_PMKSA_CACHE_EXTERNAL
+endif
+
ifndef CONFIG_NO_WPA
OBJS += src/rsn_supp/wpa.c
OBJS += src/rsn_supp/preauth.c
diff --git a/wpa_supplicant/Makefile b/wpa_supplicant/Makefile
index 41c61c1..e9e83be 100644
--- a/wpa_supplicant/Makefile
+++ b/wpa_supplicant/Makefile
@@ -303,6 +303,10 @@ ifdef CONFIG_PEERKEY
CFLAGS += -DCONFIG_PEERKEY
endif
+ifdef CONFIG_PMKSA_CACHE_EXTERNAL
+CFLAGS += -DCONFIG_PMKSA_CACHE_EXTERNAL
+endif
+
ifndef CONFIG_NO_WPA
OBJS += ../src/rsn_supp/wpa.o
OBJS += ../src/rsn_supp/preauth.o
diff --git a/wpa_supplicant/android.config b/wpa_supplicant/android.config
index 02505bb..e167f9f 100644
--- a/wpa_supplicant/android.config
+++ b/wpa_supplicant/android.config
@@ -489,4 +489,9 @@ CONFIG_WIFI_DISPLAY=y
# Support Multi Band Operation
#CONFIG_MBO=y
+# External PMKSA cache control
+# This can be used to enable control interface commands that allow the current
+# PMKSA cache entries to be fetched and new entries to be added.
+#CONFIG_PMKSA_CACHE_EXTERNAL=y
+
include $(wildcard $(LOCAL_PATH)/android_config_*.inc)
diff --git a/wpa_supplicant/ctrl_iface.c b/wpa_supplicant/ctrl_iface.c
index 05d1f7b..beb06ed 100644
--- a/wpa_supplicant/ctrl_iface.c
+++ b/wpa_supplicant/ctrl_iface.c
@@ -8714,6 +8714,154 @@ static void wpas_ctrl_iface_pmksa_flush(struct wpa_supplicant *wpa_s)
}
+#ifdef CONFIG_PMKSA_CACHE_EXTERNAL
+
+static int wpas_ctrl_iface_pmksa_get(struct wpa_supplicant *wpa_s,
+ const char *cmd, char *buf, size_t buflen)
+{
+ struct rsn_pmksa_cache_entry *entry;
+ struct wpa_ssid *ssid;
+ char *pos, *pos2, *end;
+ int ret;
+ struct os_reltime now;
+
+ ssid = wpa_config_get_network(wpa_s->conf, atoi(cmd));
+ if (!ssid)
+ return -1;
+
+ pos = buf;
+ end = buf + buflen;
+
+ os_get_reltime(&now);
+
+ /*
+ * Entry format:
+ * <BSSID> <PMKID> <PMK> <reauth_time in seconds>
+ * <expiration in seconds> <akmp> <opportunistic>
+ */
+
+ for (entry = wpa_sm_pmksa_cache_head(wpa_s->wpa); entry;
+ entry = entry->next) {
+ if (entry->network_ctx != ssid)
+ continue;
+
+ pos2 = pos;
+ ret = os_snprintf(pos2, end - pos2, MACSTR " ",
+ MAC2STR(entry->aa));
+ if (os_snprintf_error(end - pos2, ret))
+ break;
+ pos2 += ret;
+
+ pos2 += wpa_snprintf_hex(pos2, end - pos2, entry->pmkid,
+ PMKID_LEN);
+
+ ret = os_snprintf(pos2, end - pos2, " ");
+ if (os_snprintf_error(end - pos2, ret))
+ break;
+ pos2 += ret;
+
+ pos2 += wpa_snprintf_hex(pos2, end - pos2, entry->pmk,
+ entry->pmk_len);
+
+ ret = os_snprintf(pos2, end - pos2, " %d %d %d %d",
+ (int) (entry->reauth_time - now.sec),
+ (int) (entry->expiration - now.sec),
+ entry->akmp,
+ entry->opportunistic);
+ if (os_snprintf_error(end - pos2, ret))
+ break;
+ pos2 += ret;
+
+ ret = os_snprintf(pos2, end - pos2, "\n");
+ if (os_snprintf_error(end - pos2, ret))
+ break;
+ pos2 += ret;
+
+ pos = pos2;
+ }
+
+ return pos - buf;
+}
+
+
+static int wpas_ctrl_iface_pmksa_add(struct wpa_supplicant *wpa_s,
+ char *cmd)
+{
+ struct rsn_pmksa_cache_entry *entry;
+ struct wpa_ssid *ssid;
+ char *pos, *pos2;
+ int ret = -1;
+ struct os_reltime now;
+ int reauth_time = 0, expiration = 0;
+
+ /*
+ * Entry format:
+ * <network_id> <BSSID> <PMKID> <PMK> <reauth_time in seconds>
+ * <expiration in seconds> <akmp> <opportunistic>
+ */
+
+ ssid = wpa_config_get_network(wpa_s->conf, atoi(cmd));
+ if (!ssid)
+ return -1;
+
+ pos = os_strchr(cmd, ' ');
+ if (!pos)
+ return -1;
+ pos++;
+
+ entry = os_zalloc(sizeof(*entry));
+ if (!entry)
+ return -1;
+
+ if (hwaddr_aton(pos, entry->aa))
+ goto fail;
+
+ pos = os_strchr(pos, ' ');
+ if (!pos)
+ goto fail;
+ pos++;
+
+ if (hexstr2bin(pos, entry->pmkid, PMKID_LEN) < 0)
+ goto fail;
+
+ pos = os_strchr(pos, ' ');
+ if (!pos)
+ goto fail;
+ pos++;
+
+ pos2 = os_strchr(pos, ' ');
+ if (!pos2)
+ goto fail;
+ entry->pmk_len = (pos2 - pos) / 2;
+ if (entry->pmk_len < PMK_LEN || entry->pmk_len > PMK_LEN_MAX ||
+ hexstr2bin(pos, entry->pmk, entry->pmk_len) < 0)
+ goto fail;
+
+ pos = os_strchr(pos, ' ');
+ if (!pos)
+ goto fail;
+ pos++;
+
+ if (sscanf(pos, "%d %d %d %d", &reauth_time, &expiration,
+ &entry->akmp, &entry->opportunistic) != 4)
+ goto fail;
+ os_get_reltime(&now);
+ entry->expiration = now.sec + expiration;
+ entry->reauth_time = now.sec + reauth_time;
+
+ entry->network_ctx = ssid;
+
+ wpa_sm_pmksa_cache_add_entry(wpa_s->wpa, entry);
+ entry = NULL;
+ ret = 0;
+fail:
+ os_free(entry);
+ return ret;
+}
+
+#endif /* CONFIG_PMKSA_CACHE_EXTERNAL */
+
+
static int wpas_ctrl_cmd_debug_level(const char *cmd)
{
if (os_strcmp(cmd, "PING") == 0 ||
@@ -8788,6 +8936,14 @@ char * wpa_supplicant_ctrl_iface_process(struct wpa_supplicant *wpa_s,
reply_len = wpas_ctrl_iface_pmksa(wpa_s, reply, reply_size);
} else if (os_strcmp(buf, "PMKSA_FLUSH") == 0) {
wpas_ctrl_iface_pmksa_flush(wpa_s);
+#ifdef CONFIG_PMKSA_CACHE_EXTERNAL
+ } else if (os_strncmp(buf, "PMKSA_GET ", 10) == 0) {
+ reply_len = wpas_ctrl_iface_pmksa_get(wpa_s, buf + 10,
+ reply, reply_size);
+ } else if (os_strncmp(buf, "PMKSA_ADD ", 10) == 0) {
+ if (wpas_ctrl_iface_pmksa_add(wpa_s, buf + 10) < 0)
+ reply_len = -1;
+#endif /* CONFIG_PMKSA_CACHE_EXTERNAL */
} else if (os_strncmp(buf, "SET ", 4) == 0) {
if (wpa_supplicant_ctrl_iface_set(wpa_s, buf + 4))
reply_len = -1;
diff --git a/wpa_supplicant/defconfig b/wpa_supplicant/defconfig
index aca9e81..f6df81a 100644
--- a/wpa_supplicant/defconfig
+++ b/wpa_supplicant/defconfig
@@ -562,3 +562,8 @@ CONFIG_PEERKEY=y
# This is needed to be able to use mode=1 network profile with proto=RSN and
# key_mgmt=WPA-PSK (i.e., full key management instead of WPA-None).
#CONFIG_IBSS_RSN=y
+
+# External PMKSA cache control
+# This can be used to enable control interface commands that allow the current
+# PMKSA cache entries to be fetched and new entries to be added.
+#CONFIG_PMKSA_CACHE_EXTERNAL=y