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cfg80211: Validate cipher suite against supported ciphers

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Instead of using a hardcoded list of cipher suites in nl80211.c, use a
shared function in util.c to verify that the driver advertises support
for the specified cipher. This provides more accurate validation of the
values and allows vendor-specific cipher suites to be added in drivers.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Jouni Malinen 2011-09-21 18:14:56 +03:00 committed by John W. Linville
parent 6d30240e3d
commit 38ba3c57af
3 changed files with 15 additions and 18 deletions
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1
net/wireless/core.h
View File

@ -406,6 +406,7 @@ void cfg80211_sme_failed_assoc(struct wireless_dev *wdev);
bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev); bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev);
/* internal helpers */ /* internal helpers */
bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher);
int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev, int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
struct key_params *params, int key_idx, struct key_params *params, int key_idx,
bool pairwise, const u8 *mac_addr); bool pairwise, const u8 *mac_addr);

16
net/wireless/nl80211.c
View File

@ -4126,16 +4126,6 @@ static bool nl80211_valid_wpa_versions(u32 wpa_versions)
NL80211_WPA_VERSION_2)); NL80211_WPA_VERSION_2));
} }
static bool nl80211_valid_cipher_suite(u32 cipher)
{
return cipher == WLAN_CIPHER_SUITE_WEP40 ||
cipher == WLAN_CIPHER_SUITE_WEP104 ||
cipher == WLAN_CIPHER_SUITE_TKIP ||
cipher == WLAN_CIPHER_SUITE_CCMP ||
cipher == WLAN_CIPHER_SUITE_AES_CMAC;
}
static int nl80211_authenticate(struct sk_buff *skb, struct genl_info *info) static int nl80211_authenticate(struct sk_buff *skb, struct genl_info *info)
{ {
struct cfg80211_registered_device *rdev = info->user_ptr[0]; struct cfg80211_registered_device *rdev = info->user_ptr[0];
@ -4268,7 +4258,8 @@ static int nl80211_crypto_settings(struct cfg80211_registered_device *rdev,
memcpy(settings->ciphers_pairwise, data, len); memcpy(settings->ciphers_pairwise, data, len);
for (i = 0; i < settings->n_ciphers_pairwise; i++) for (i = 0; i < settings->n_ciphers_pairwise; i++)
if (!nl80211_valid_cipher_suite( if (!cfg80211_supported_cipher_suite(
&rdev->wiphy,
settings->ciphers_pairwise[i])) settings->ciphers_pairwise[i]))
return -EINVAL; return -EINVAL;
} }
@ -4276,7 +4267,8 @@ static int nl80211_crypto_settings(struct cfg80211_registered_device *rdev,
if (info->attrs[NL80211_ATTR_CIPHER_SUITE_GROUP]) { if (info->attrs[NL80211_ATTR_CIPHER_SUITE_GROUP]) {
settings->cipher_group = settings->cipher_group =
nla_get_u32(info->attrs[NL80211_ATTR_CIPHER_SUITE_GROUP]); nla_get_u32(info->attrs[NL80211_ATTR_CIPHER_SUITE_GROUP]);
if (!nl80211_valid_cipher_suite(settings->cipher_group)) if (!cfg80211_supported_cipher_suite(&rdev->wiphy,
settings->cipher_group))
return -EINVAL; return -EINVAL;
} }

16
net/wireless/util.c
View File

@ -151,12 +151,19 @@ void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
set_mandatory_flags_band(wiphy->bands[band], band); set_mandatory_flags_band(wiphy->bands[band], band);
} }
bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
{
int i;
for (i = 0; i < wiphy->n_cipher_suites; i++)
if (cipher == wiphy->cipher_suites[i])
return true;
return false;
}
int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev, int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
struct key_params *params, int key_idx, struct key_params *params, int key_idx,
bool pairwise, const u8 *mac_addr) bool pairwise, const u8 *mac_addr)
{ {
int i;
if (key_idx > 5) if (key_idx > 5)
return -EINVAL; return -EINVAL;
@ -226,10 +233,7 @@ int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
} }
} }
for (i = 0; i < rdev->wiphy.n_cipher_suites; i++) if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
if (params->cipher == rdev->wiphy.cipher_suites[i])
break;
if (i == rdev->wiphy.n_cipher_suites)
return -EINVAL; return -EINVAL;
return 0; return 0;