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Bugfix: Fix inadvertent cost-climbing when recalculating the password hashing cost

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Starbeamrainbowlabs 2018-09-30 14:47:54 +01:00
parent 1a11c84e1d
commit 57ec8b82b5
Signed by: sbrl
GPG key ID: 1BE5172E637709C2
5 changed files with 47 additions and 14 deletions
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5
Changelog.md
View file

@ -1,6 +1,11 @@
# Changelog
This file holds the changelog for Pepperminty Wiki. This is the master list of things that have changed (second only to the commit history!) - though the information for any particular release can also be found in the description of it's page for every release made on GitHub too.
## v0.17-beta2
### Fixed
- Fixed the cost-climbing bug in the last beta release
## v0.17-beta1
### Added

28
build/index.php
View file

@ -59,7 +59,7 @@ $guiConfig = <<<'GUICONFIG'
"user_preferences_button_text": { "type": "text", "description": "The text to display on the button that lets logged in users change their settings. Defaults to a cog (aka a 'gear' in unicode-land).", "default": "&#x2699; " },
"password_algorithm": { "type": "text", "description": "The algorithm to utilise when hashing passwords. Takes any value PHP's password_hash() does.", "default": "PASSWORD_DEFAULT" },
"password_cost": { "type": "number", "description": "The cost to use when hashing passwords.", "default": 12},
"password_cost_time": { "type": "number", "description": "The desired number of milliseconds to delay by when hashing passwords. Pepperminty Wiki will automatically update the value of password_cost to take the length of time specified here. If you're using PASSWORD_ARGON2I, then the auto-update will be disabled.", "default": 100},
"password_cost_time": { "type": "number", "description": "The desired number of milliseconds to delay by when hashing passwords. Pepperminty Wiki will automatically update the value of password_cost to take the length of time specified here. If you're using PASSWORD_ARGON2I, then the auto-update will be disabled.", "default": 350},
"password_cost_time_interval": { "type": "number", "description": "The interval, in seconds, at which the password cost should be recalculated. Set to -1 to disable. Default: 1 week", "default": 604800},
"password_cost_time_lastcheck": { "type": "number", "description": "Pseudo-setting used to keep track of the last recalculation of password_cost. Is updated with the current unix timestamp every time password_cost is recalculated.", "default": 0},
"new_password_length": { "type": "number", "description": "The length of newly-generated passwords. This is currently used in the user table when creating new accounts.", "default": 32},
@ -407,7 +407,7 @@ if($settings->sessionprefix == "auto")
/////////////////////////////////////////////////////////////////////////////
/** The version of Pepperminty Wiki currently running. */
$version = "v0.17-beta1";
$commit = "a45a3aa087752b4f26af0a02785efc8b08436ce2";
$commit = "1a11c84e1dd0104e1cc9dc44eaaa737982165f4c";
/// Environment ///
/** Holds information about the current request environment. */
$env = new stdClass();
@ -8016,6 +8016,22 @@ register_module([
}
});
add_action("hash-cost-test", function() {
header("content-type: text/plain");
$time_compute = microtime(true);
$cost = hash_password_compute_cost();
$time_compute = (microtime(true) - $time_compute)*1000;
$time_cost = microtime(true);
password_hash("testing", PASSWORD_DEFAULT, [ "cost" => $cost ]);
$time_cost = (microtime(true) - $time_cost)*1000;
echo("Calculated cost: $cost ({$time_cost}ms)\n");
echo("Time taken: {$time_compute}ms\n");
exit(date("r"));
});
// Register a section on logging in on the help page.
add_help_section("30-login", "Logging in", "<p>In order to edit $settings->sitename and have your edit attributed to you, you need to be logged in. Depending on the settings, logging in may be a required step if you want to edit at all. Thankfully, loggging in is not hard. Simply click the &quot;Login&quot; link in the top left, type your username and password, and then click login.</p>
<p>If you do not have an account yet and would like one, try contacting <a href='mailto:" . hide_email($settings->admindetails_email) . "'>$settings->admindetails_name</a>, $settings->sitename's administrator and ask them nicely to see if they can create you an account.</p>");
@ -8121,23 +8137,21 @@ function hash_password_compute_cost() {
$props = hash_password_properties();
if($props["algorithm"] == PASSWORD_ARGON2I)
return null;
if(!is_int($props["options"]["cost"]))
$props["options"]["cost"] = 10;
$props["options"]["cost"] = 10;
$target_cost_time = $settings->password_cost_time / 1000; // The setting is in ms
$start = microtime(true);
do {
$props["options"]["cost"]++;
$start_i = microtime(true);
password_hash("testing", $props["algorithm"], $props["options"]);
$end_i = microtime(true);
echo("Attempt | cost = {$props["options"]["cost"]}, time = " . ($end_i - $start_i)*1000 . "ms\n");
// Iterate until we find a cost high enough
// ....but don't keep going forever - try for at most 10x the target
// time in total (in case the specified algorithm doesn't take a
// cost parameter)
} while($end_i - $start_i < $target_cost_time &&
$end_i - $start < $target_cost_time * 10);
} while($end_i - $start_i < $target_cost_time);
return $props["options"]["cost"];
}

2
module_index.json
View file

@ -212,7 +212,7 @@
"author": "Starbeamrainbowlabs",
"description": "Adds a pair of actions (login and checklogin) that allow users to login. You need this one if you want your users to be able to login.",
"id": "page-login",
"lastupdate": 1527246396,
"lastupdate": 1538314946,
"optional": false
},
{

24
modules/page-login.php
View file

@ -150,6 +150,22 @@ register_module([
}
});
add_action("hash-cost-test", function() {
header("content-type: text/plain");
$time_compute = microtime(true);
$cost = hash_password_compute_cost();
$time_compute = (microtime(true) - $time_compute)*1000;
$time_cost = microtime(true);
password_hash("testing", PASSWORD_DEFAULT, [ "cost" => $cost ]);
$time_cost = (microtime(true) - $time_cost)*1000;
echo("Calculated cost: $cost ({$time_cost}ms)\n");
echo("Time taken: {$time_compute}ms\n");
exit(date("r"));
});
// Register a section on logging in on the help page.
add_help_section("30-login", "Logging in", "<p>In order to edit $settings->sitename and have your edit attributed to you, you need to be logged in. Depending on the settings, logging in may be a required step if you want to edit at all. Thankfully, loggging in is not hard. Simply click the &quot;Login&quot; link in the top left, type your username and password, and then click login.</p>
<p>If you do not have an account yet and would like one, try contacting <a href='mailto:" . hide_email($settings->admindetails_email) . "'>$settings->admindetails_name</a>, $settings->sitename's administrator and ask them nicely to see if they can create you an account.</p>");
@ -255,23 +271,21 @@ function hash_password_compute_cost() {
$props = hash_password_properties();
if($props["algorithm"] == PASSWORD_ARGON2I)
return null;
if(!is_int($props["options"]["cost"]))
$props["options"]["cost"] = 10;
$props["options"]["cost"] = 10;
$target_cost_time = $settings->password_cost_time / 1000; // The setting is in ms
$start = microtime(true);
do {
$props["options"]["cost"]++;
$start_i = microtime(true);
password_hash("testing", $props["algorithm"], $props["options"]);
$end_i = microtime(true);
echo("Attempt | cost = {$props["options"]["cost"]}, time = " . ($end_i - $start_i)*1000 . "ms\n");
// Iterate until we find a cost high enough
// ....but don't keep going forever - try for at most 10x the target
// time in total (in case the specified algorithm doesn't take a
// cost parameter)
} while($end_i - $start_i < $target_cost_time &&
$end_i - $start < $target_cost_time * 10);
} while($end_i - $start_i < $target_cost_time);
return $props["options"]["cost"];
}

2
peppermint.guiconfig.json
View file

@ -36,7 +36,7 @@
"user_preferences_button_text": { "type": "text", "description": "The text to display on the button that lets logged in users change their settings. Defaults to a cog (aka a 'gear' in unicode-land).", "default": "&#x2699; " },
"password_algorithm": { "type": "text", "description": "The algorithm to utilise when hashing passwords. Takes any value PHP's password_hash() does.", "default": "PASSWORD_DEFAULT" },
"password_cost": { "type": "number", "description": "The cost to use when hashing passwords.", "default": 12},
"password_cost_time": { "type": "number", "description": "The desired number of milliseconds to delay by when hashing passwords. Pepperminty Wiki will automatically update the value of password_cost to take the length of time specified here. If you're using PASSWORD_ARGON2I, then the auto-update will be disabled.", "default": 100},
"password_cost_time": { "type": "number", "description": "The desired number of milliseconds to delay by when hashing passwords. Pepperminty Wiki will automatically update the value of password_cost to take the length of time specified here. If you're using PASSWORD_ARGON2I, then the auto-update will be disabled.", "default": 350},
"password_cost_time_interval": { "type": "number", "description": "The interval, in seconds, at which the password cost should be recalculated. Set to -1 to disable. Default: 1 week", "default": 604800},
"password_cost_time_lastcheck": { "type": "number", "description": "Pseudo-setting used to keep track of the last recalculation of password_cost. Is updated with the current unix timestamp every time password_cost is recalculated.", "default": 0},
"new_password_length": { "type": "number", "description": "The length of newly-generated passwords. This is currently used in the user table when creating new accounts.", "default": 32},