I have tried with ModifyRequest but unfortunately I was not able to find the proper way.
I see it is very straightforward to do with DirectoryEntry but I must use the raw LdapConnection since it is the only way that allows authentication through client certificates.
If anyone has any solution or ideas, it would be great to discuss it.
I haven't really used LdapConnection as I usually use DirectoryEntry, however, I did write an article about how to work with security descriptor attributes, which might help you: Active Directory: Handling NT Security Descriptor attributes
I talked about getting the value from DirectoryEntry and DirectorySearcher. However, I suspect LdapConnnection will give you a raw byte array, in which case the section on Getting the value from DirectorySearcher may help you, since that shows how to create an ActiveDirectorySecurity object from a byte array. For example, if you have the byte array in a variable called byteArray, you can do this:
var adSecurity = new ActiveDirectorySecurity();
adSecurity.SetSecurityDescriptorBinaryForm(byteArray);
Then you can use adSecurity.GetSecurityDescriptorBinaryForm() to convert it back to a byte array before writing it back to AD.
Related
I am testing hashing in the rules playground:
This returns "CRexOpCRkV1UtjNvRZCVOczkUrNmGyHzhkGKJXiDswo=", the correct hash of the string "SECRET" :
let expected = hashing.sha256("SECRET");
But this returns "SECRETpath/to/the/file.mp4", the argument itself instead of its hash:
let expected = hashing.sha256("SECRET" + request.resource.name);
Is it a bug in the rules playground?
Can hashing functions be used on dynamic values or is it intentionally prevented?
The strange rules playground behavior has been mentioned here before, this time with Firestore security rules: Firestore rules hashing returns identity
Firebaser here!
There are a few issues at play here. I think the primary source of confusion is that the hashing.sha256 function returns a rules.Bytes type. It appears that the Rules Playground in the Firebase Console incorrectly shows a string value when debugging the bytes type, but that is unrelated to behavior in production. For example, this Rule will always deny:
allow write: if hashing.sha256("SECRET" + request.resource.name) ==
"SECRET" + request.resource.name;
To get the behavior you're looking for, you need to use one of the conversion functions for the rules.Bytes type. Based on your question, you'll probably want the toBase64() function, but toHexString() is also an option. If you try these functions in your Rules, the Playground should start behaving correctly and the Rules will work as expected in production as well. So to put it all together, you'd write:
let expected = hashing.sha256("SECRET" + request.resource.name).toBase64();
For example, the rules listed below would allow you to upload a file called "foo/bar" (as Gqot1HkcleDFQ5770UsfmKDKQxt_-Jp4DRkTNmXL9m4= is the Base64 SHA-256 hash of "SECRETfoo/bar")
allow write: if hashing.sha256('SECRET' + request.resource.name).toBase64() ==
"Gqot1HkcleDFQ5770UsfmKDKQxt_-Jp4DRkTNmXL9m4=";
I hope this helps clear things up! Separately we will look into addressing the wrong debugging output in the Playground
After trying with emulators and the deployed app, it seems that hashing.sha256 does not work on dynamic data in any environment. The behavior is consistent, so I filed a feature request to add this function to storage security rules. This would be nice because it would allow passing signed data to the security rule for each file (for ex: an upload authorization obtained via a Cloud Function)
As of now, the workaround that I imagine is putting data in user custom token (or custom claims), so I can pass signed data to the security rule. It is not ideal because I need to re-sign with custom token for every file upload.
Thanks to the accepted answer in the following solution, I'm now able to extract most of the values I need from NOAA alerts: perl Data::Dumper to extract key values
I would like to parse the "CAP id" as well, however when I try, I receive a hashed value instead of the URL.
For example, using the previously mentioned thread, what I would like to parse is:
http://alerts.weather.gov/cap/wwacapget.php?x=TX12516CBE9400.FloodWarning.12516CC068C0TX.MAFFLWMAF.f21e7ce7cf8e930ab73a110c4d912576
What I get instead: HASH(0x26384c0)
I imagine this is only possible by modifying alert.pm:
https://github.com/mikegrb/Weather-NOAA-Alert/blob/master/lib/Weather/NOAA/Alert.pm and if I've read enough into the issue, it may be on account of XML::Simple?
Typically, I would use XPath to parse XML like data, but for this ATOM format I'm lost.
Ultimately, I'm simply looking to add the parsed variables to an SQL database. With NOAA looking to transition from CAP v1.1 to v1.2 (when, I have no clue), perhaps I should be looking at using something else.
In your previous code, you can get the single key of the hashref $events->{'TXC301'} like this:
my #keys = keys %{$events->{'TXC301'}}
my $alert_url = $keys[0]
Now $alert_url should hold the URL you were mentioning.
Does this answer your question?
I am not able to figure out how to build a hexadecimal block, if I have all the needed information (Hash, Merkel Root, etc.).
Please use this JSON formatted block as reference: Block #506398
I understand the first 64 bytes are the block header, however what about the rest of the bytes?
Thanks For Your Help!
Here you have some articles about bitcoin block structure:
https://medium.com/all-things-ledger/bitcoins-implementation-of-blockchain-2be713f662c2
https://medium.com/crypto-currently/lets-build-the-tiniest-blockchain-e70965a248b
https://medium.com/capital-one-developers/bitcoin-blockchain-and-building-blocks-9f304380c77d
Please keep in mind that JSON is not compatible with bitcoin protocol. It is a easy to read representation of original block.
I'm using a plugin and want to perform an action based on the records statuscode value. I've seen online that you can use entity.FormattedValues["statuscode"] to get values from option sets but when try it I get an error saying "The given key was not present in the dictionary".
I know this can happen when the plugin cant find the change for the field you're looking for, but i've already checked that this does exist using entity.Contains("statuscode") and it passes by that fine but still hits this error.
Can anyone help me figure out why its failing?
Thanks
I've not seen the entity.FormattedValues before.
I usually use the entity.Attributes, e.g. entity.Attributes["statuscode"].
MSDN
Edit
Crm wraps many of the values in objects which hold additional information, in this case statuscode uses the OptionSetValue, so to get the value you need to:
((OptionSetValue)entity.Attributes["statuscode"]).Value
This will return a number, as this is the underlying value in Crm.
If you open up the customisation options in Crm, you will usually (some system fields are locked down) be able to see the label and value for each option.
If you need the label, you could either do some hardcoding based on the information in Crm.
Or you could retrieve it from the metadata services as described here.
To avoid your error, you need to check the collection you wish to use (rather than the Attributes collection):
if (entity.FormattedValues.Contains("statuscode")){
var myStatusCode = entity.FormattedValues["statuscode"];
}
However although the SDK fails to confirm this, I suspect that FormattedValues are only ever present for numeric or currency attributes. (Part-speculation on my part though).
entity.FormattedValues work only for string display value.
For example you have an optionset with display names as 1, 2, 3,
The above statement do not recognize these values because those are integers. If You have seen the exact defintion of formatted values in the below link
http://msdn.microsoft.com/en-in/library/microsoft.xrm.sdk.formattedvaluecollection.aspx
you will find this statement is valid for only string display values. If you try to use this statement with Integer values it will throw key not found in dictionary exception.
So try to avoid this statement for retrieving integer display name optionset in your code.
Try this
string Title = (bool)entity.Attributes.Contains("title") ? entity.FormattedValues["title"].ToString() : "";
When you are talking about Option set, you have value and label. What this will give you is the label. '?' will make sure that the null value is never passed.
I have some strings and some hashes of them, but I don't know which hash function is used. Any idea?
String hash
NN34W f8b46bcdc3b3c92
EM3M3 d8015ca876fd051
HXDKD a740e97464e5dfe
AKREJ aa7aa2dadfcbe53
3bNMK 0f11440639191d9
Edit:
Thank for answers, it's a hash of the captcha.
https://registracia.azet.sk/
If you check URL of captcha image, on the end is HASH value. This
On the server are send in HTTP POST are send TEXT: (P92M4) and HASH (72fec89a2e0ade2) and other values.
I like know how comptute hash of the TEXT P92M4, and control with HASH value, which is send on server.
Because I like make own captcha system for my school project, so I first analyzing situation and weakness.
As I understand your situation, a POST request sends both the "text" and the "hash" to the CAPTCHA server. This then uses whatever hash function they use to hash your text, checks to see if it matches the hash, and decides whether or not you succeeded. Presumably, the server sends you the image, as well as the hash, and then you enter the text.
As such, if you figured out the hashing function, you'd have completely broken this CAPTCHA system: All you would need to do is hash any string using their hashing function, and then when sending your POST request, ignore the hash they sent you and merely send them your computed text and hash pair. Thus, you could very easily automate successfully passing the CAPTCHA challenge.
To illustrate how difficult "reversing" the hash might be, consider the following hash that they very well might use:
Split the TEXT up alternating letters: thus ABCDE becomes ACE and BD
md5 the two halves using salts "fj49w0utw4a" and "r8h3wlsd"
md5("fj49w0utw4a"."ACE") is 115c05f0e5300f958ba01caa64b989f
md5("r8h3wlsd"."BD") is 74eecae86ef46382eb95443a1b1fa8f5
Take every 3rd char of the first string and every 4th char of the second, and alternate them until you have 15 chars
115c05f0e5300f958ba01caa64b989f becomes 55e09b1ab9
74eecae86ef46382eb95443a1b1fa8f5 becomes e8425af5
Final hash value for "ABCDE": 5e58e40295ba1fa
There is really no way you are ever going to reverse engineer that.
UPDATE
Note that CAPTCHAs as described above (and implemented on that site) are extremely insecure, as they only require one valid text/hash combination to be known
To demonstrate, use Firebug or equivalent and navigate to the CAPTCHA area of the form. We will be editing some hidden values.
Change the form[captcha_url] value from https://pokec.azet.sk/sluzby/system/captcha/[somehash] to https://pokec.azet.sk/sluzby/system/captcha/ee2be1f239e5d17
Change the form[captcha_hash] value from [somehash] to ee2be1f239e5d17
Regardless of what the picture says, type "P22KD" for the CAPTCHA
There are several ways to mitigate this vulnerability. As Tangrs suggested, you can store the hash value in a session variable so that it cannot be manipulated by the client. Less elegant but also effective is to store the submitted CAPTCHA in a database and not allow duplicate CAPTCHAs, as is implemented on the link in the question. This is fine, until you start running out of unused CAPTCHAs and end up getting collisions.
Seems smaller than any industry hash... possibly it's propriety?
A bit more info would help though, what language, where did you get it from?