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thunderbolt: Allow clearing the key

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If secure authentication of a devices fails, either because the device
already has another key uploaded, or there is some other error sending
challenge to the device, and the user only wants to approve the device
just once (without a new key being uploaded to the device) the current
implementation does not allow this because the key cannot be cleared
once set even if we allow it to be changed.

Make this scenario possible and allow clearing the key by writing
empty string to the key sysfs file.

Signed-off-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bernat, Yehezkel 2017-08-15 08:19:20 +03:00 committed by Greg Kroah-Hartman
parent 0956e41169
commit e545f0d8a5
2 changed files with 13 additions and 4 deletions
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2
Documentation/ABI/testing/sysfs-bus-thunderbolt
View File

@ -45,6 +45,8 @@ Contact: thunderbolt-software@lists.01.org
Description: When a devices supports Thunderbolt secure connect it will
have this attribute. Writing 32 byte hex string changes
authorization to use the secure connection method instead.
Writing an empty string clears the key and regular connection
method can be used again.
What: /sys/bus/thunderbolt/devices/.../device
Date: Sep 2017

15
drivers/thunderbolt/switch.c
View File

@ -807,8 +807,11 @@ static ssize_t key_store(struct device *dev, struct device_attribute *attr,
struct tb_switch *sw = tb_to_switch(dev);
u8 key[TB_SWITCH_KEY_SIZE];
ssize_t ret = count;
bool clear = false;
if (hex2bin(key, buf, sizeof(key)))
if (!strcmp(buf, "\n"))
clear = true;
else if (hex2bin(key, buf, sizeof(key)))
return -EINVAL;
if (mutex_lock_interruptible(&switch_lock))
@ -818,9 +821,13 @@ static ssize_t key_store(struct device *dev, struct device_attribute *attr,
ret = -EBUSY;
} else {
kfree(sw->key);
sw->key = kmemdup(key, sizeof(key), GFP_KERNEL);
if (!sw->key)
ret = -ENOMEM;
if (clear) {
sw->key = NULL;
} else {
sw->key = kmemdup(key, sizeof(key), GFP_KERNEL);
if (!sw->key)
ret = -ENOMEM;
}
}
mutex_unlock(&switch_lock);