Re: [openssl-users] Multiple client connection to Nginx server

[Filipe Fernandes]

Hi,

Socket file descriptor is unique during the entire connection time. You
could save the data using the fd as key to a hashtable entry.

Regards

Na(o) quinta, 13 de dez de 2018, 05:16, ASHIQUE CK 
escreveu:

> 4. f-stack nginx server 1.11.10
>
> On Thu, Dec 13, 2018 at 9:00 AM ASHIQUE CK  wrote:
>
>> Hi,
>> 1. The engine that we wrote is by the reference of qat, is just an
>> interface which receives the openssl parameters of AES and RSA and offload
>> them to an FPGA hardware accelerator.
>> 2.
>> 3. Openssl 1.1.0 h
>> 4. Uses f-stack nginx 1.10.1
>> 5. We ran nginx server which have a 1 Gb file in its root directory. Then
>> connected 3 clients to this server. These clients waits after handshake is
>> done. After I run 3rd client, I gave a Get request through 1 st client to
>> download that 1 gb file. But it showed error message, "decryption failed or
>> bad record mac". When I debugged using gdb, I understood that Tag
>> verification is getting failed. But the matter is, I am storing the Key and
>> IV at the time of handshake itself, to a buffer in my engine. When an
>> SSLRead or SSLWrite occur, I will copy the saved Key and Iv to fill the
>> respective descriptors.
>>   But, in this case what happens is, if there is 3rd client handshake
>> occurred, its key and iv stored in a buffer. And when I give a Sslwrite in
>> the 1st client, it used the last saved key and iv, but it is actually key
>> and iv of 3 rd client. But I can download the file if I give get request
>> through the last handshaked client.
>>  So what I can do is, save the key and iv of different clients in
>> different buffers. If the SSLread/write from any client comes, then just
>> offload the key and iv from the respective buffer. But for that, i need a
>> unique id for each client, which must be the same for a client in the
>> entire connection.
>> How can i get the unique id. Beyond the parameters *in, *out, inl (in
>> the case of plaintext/ cipher text offloading) and *ptr, *type, *arg (in
>> the case of header/aad offload) only what I have is ctx. With this ctx, can
>> i get a unique id or is there any way to solve this problem.
>> 6. Didn't tried with Apache server.
>>
>> Thanks
>>
>> On Thu 13 Dec, 2018, 1:30 AM Michael Richardson >
>>>
>>> ASHIQUE CK  wrote:
>>> > We are using a Crypto Accelerator Engine to offload AESGCM and RSA
>>> > parameters. Trying to connect multiple clients simultaneously with a
>>> > single Nginx server, which is using this accelerator. The Key and IV
>>>
>>> You probably need to tell us:
>>>
>>> 1) which engine?  did you write this engine?
>>> 2) whose driver?
>>> 3) what version of openssl?
>>> 4) what version of nginx?
>>> 5) how did you observe the problem you described?
>>> 6) is it different for, for instance, apache?  or some other server
>>> software?
>>>
>>> > is passing only at handshake, and after handshake this set of key and
>>> > IV is using for all encryption and decryption. So at Engine side, we
>>> > are storing this Key and IV to a buffer and while
>>> > encrypting/decrypting , this Key and IV is used from this buffer. But,
>>> > while multiple client connects, the last saved Key/IV is getting for
>>> > all clients.
>>> > So, is there any way to get a unique ID foer each client connection ?
>>> >
>>> --
>>> openssl-users mailing list
>>> To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users
>>>
>> --
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Re: [openssl-users] Multiple client connection to Nginx server

[ASHIQUE CK]

4. f-stack nginx server 1.11.10

On Thu, Dec 13, 2018 at 9:00 AM ASHIQUE CK  wrote:

> Hi,
> 1. The engine that we wrote is by the reference of qat, is just an
> interface which receives the openssl parameters of AES and RSA and offload
> them to an FPGA hardware accelerator.
> 2.
> 3. Openssl 1.1.0 h
> 4. Uses f-stack nginx 1.10.1
> 5. We ran nginx server which have a 1 Gb file in its root directory. Then
> connected 3 clients to this server. These clients waits after handshake is
> done. After I run 3rd client, I gave a Get request through 1 st client to
> download that 1 gb file. But it showed error message, "decryption failed or
> bad record mac". When I debugged using gdb, I understood that Tag
> verification is getting failed. But the matter is, I am storing the Key and
> IV at the time of handshake itself, to a buffer in my engine. When an
> SSLRead or SSLWrite occur, I will copy the saved Key and Iv to fill the
> respective descriptors.
>   But, in this case what happens is, if there is 3rd client handshake
> occurred, its key and iv stored in a buffer. And when I give a Sslwrite in
> the 1st client, it used the last saved key and iv, but it is actually key
> and iv of 3 rd client. But I can download the file if I give get request
> through the last handshaked client.
>  So what I can do is, save the key and iv of different clients in
> different buffers. If the SSLread/write from any client comes, then just
> offload the key and iv from the respective buffer. But for that, i need a
> unique id for each client, which must be the same for a client in the
> entire connection.
> How can i get the unique id. Beyond the parameters *in, *out, inl (in
> the case of plaintext/ cipher text offloading) and *ptr, *type, *arg (in
> the case of header/aad offload) only what I have is ctx. With this ctx, can
> i get a unique id or is there any way to solve this problem.
> 6. Didn't tried with Apache server.
>
> Thanks
>
> On Thu 13 Dec, 2018, 1:30 AM Michael Richardson 
>>
>> ASHIQUE CK  wrote:
>> > We are using a Crypto Accelerator Engine to offload AESGCM and RSA
>> > parameters. Trying to connect multiple clients simultaneously with a
>> > single Nginx server, which is using this accelerator. The Key and IV
>>
>> You probably need to tell us:
>>
>> 1) which engine?  did you write this engine?
>> 2) whose driver?
>> 3) what version of openssl?
>> 4) what version of nginx?
>> 5) how did you observe the problem you described?
>> 6) is it different for, for instance, apache?  or some other server
>> software?
>>
>> > is passing only at handshake, and after handshake this set of key and
>> > IV is using for all encryption and decryption. So at Engine side, we
>> > are storing this Key and IV to a buffer and while
>> > encrypting/decrypting , this Key and IV is used from this buffer. But,
>> > while multiple client connects, the last saved Key/IV is getting for
>> > all clients.
>> > So, is there any way to get a unique ID foer each client connection ?
>> >
>> --
>> openssl-users mailing list
>> To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users
>>
>
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Re: [openssl-users] Multiple client connection to Nginx server

[ASHIQUE CK]

Hi,
1. The engine that we wrote is by the reference of qat, is just an
interface which receives the openssl parameters of AES and RSA and offload
them to an FPGA hardware accelerator.
2.
3. Openssl 1.1.0 h
4. Uses f-stack nginx 1.10.1
5. We ran nginx server which have a 1 Gb file in its root directory. Then
connected 3 clients to this server. These clients waits after handshake is
done. After I run 3rd client, I gave a Get request through 1 st client to
download that 1 gb file. But it showed error message, "decryption failed or
bad record mac". When I debugged using gdb, I understood that Tag
verification is getting failed. But the matter is, I am storing the Key and
IV at the time of handshake itself, to a buffer in my engine. When an
SSLRead or SSLWrite occur, I will copy the saved Key and Iv to fill the
respective descriptors.
  But, in this case what happens is, if there is 3rd client handshake
occurred, its key and iv stored in a buffer. And when I give a Sslwrite in
the 1st client, it used the last saved key and iv, but it is actually key
and iv of 3 rd client. But I can download the file if I give get request
through the last handshaked client.
 So what I can do is, save the key and iv of different clients in
different buffers. If the SSLread/write from any client comes, then just
offload the key and iv from the respective buffer. But for that, i need a
unique id for each client, which must be the same for a client in the
entire connection.
How can i get the unique id. Beyond the parameters *in, *out, inl (in
the case of plaintext/ cipher text offloading) and *ptr, *type, *arg (in
the case of header/aad offload) only what I have is ctx. With this ctx, can
i get a unique id or is there any way to solve this problem.
6. Didn't tried with Apache server.

Thanks

On Thu 13 Dec, 2018, 1:30 AM Michael Richardson 
> ASHIQUE CK  wrote:
> > We are using a Crypto Accelerator Engine to offload AESGCM and RSA
> > parameters. Trying to connect multiple clients simultaneously with a
> > single Nginx server, which is using this accelerator. The Key and IV
>
> You probably need to tell us:
>
> 1) which engine?  did you write this engine?
> 2) whose driver?
> 3) what version of openssl?
> 4) what version of nginx?
> 5) how did you observe the problem you described?
> 6) is it different for, for instance, apache?  or some other server
> software?
>
> > is passing only at handshake, and after handshake this set of key and
> > IV is using for all encryption and decryption. So at Engine side, we
> > are storing this Key and IV to a buffer and while
> > encrypting/decrypting , this Key and IV is used from this buffer. But,
> > while multiple client connects, the last saved Key/IV is getting for
> > all clients.
> > So, is there any way to get a unique ID foer each client connection ?
> >
> --
> openssl-users mailing list
> To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users
>
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Re: [openssl-users] Multiple client connection to Nginx server

[Michael Richardson]

ASHIQUE CK  wrote:
> We are using a Crypto Accelerator Engine to offload AESGCM and RSA
> parameters. Trying to connect multiple clients simultaneously with a
> single Nginx server, which is using this accelerator. The Key and IV

You probably need to tell us:

1) which engine?  did you write this engine?
2) whose driver?
3) what version of openssl?
4) what version of nginx?
5) how did you observe the problem you described?
6) is it different for, for instance, apache?  or some other server software?

> is passing only at handshake, and after handshake this set of key and
> IV is using for all encryption and decryption. So at Engine side, we
> are storing this Key and IV to a buffer and while
> encrypting/decrypting , this Key and IV is used from this buffer. But,
> while multiple client connects, the last saved Key/IV is getting for
> all clients.
> So, is there any way to get a unique ID foer each client connection ?
>


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Re: [openssl-users] Multiple client connection to Nginx server

[ASHIQUE CK]

Hi,
Thanks for your reply.
Openssl only passes (ctx,type,arg,ptr) in the case of header and
(ctx,out,in,inl) in the case of message, these two are the only links to
engine after the handshake process for the whole process. In my case, I am
downloading a file from nginx root directory using a client program. How
can I get a unique id, so that I can copy the respective Key and Iv
everytime when a sslwrite request comes from a client with that id. Because
I am trying to run 3 clients simultaneously for downloading a file. I am
able to download only at one client ,the last connected one, and other two
shows that tag verification failed. Because both those connections got the
same key and Iv of the last connection.
   So for every client connection, is there any way to get a unique id so
that i can load respective Key and Iv. But the only link from openssl to
the engine are the above mentioned two cases. Only what I am getting some
other information is from *ctx*. Can I do something with that *ctx *get
unique id.

Thanks

On Wed 12 Dec, 2018, 7:56 PM Jakob Bohm via openssl-users <
openssl-users@openssl.org wrote:

> On 12/12/2018 12:54, ASHIQUE CK wrote:
> > Hi,
> > Any help on this ?
> >
> > On Wed, Dec 12, 2018 at 3:03 PM ASHIQUE CK  > > wrote:
> >
> > Hi,
> > We are using a Crypto Accelerator Engine to offload AESGCM and RSA
> > parameters. Trying to connect multiple clients simultaneously with
> > a single Nginx server, which is using this accelerator.  The Key
> > and IV is passing only at handshake, and after handshake this set
> > of key and IV is using for all encryption and decryption. So at
> > Engine side, we are storing this Key and IV to a buffer and while
> > encrypting/decrypting , this Key and IV is used from this buffer.
> > But, while multiple client connects, the last saved Key/IV is
> > getting for all clients.
> > So, is there any way to get a unique ID foer each client
> > connection ?
> >
> >
> The following assumes that the accelerator is accessed using an
> OpenSSL "engine" plugin, if instead you are inserting code in NGINX
> to hand over the complete SSL/TLS record processing to the hardware,
> then a different approach is needed.
>
> OpenSSL Crypto Engines are not limited to SSL/TLS but can be used
> for other tasks using the OpenSSL libcrypto library.
>
> Thus the way this works is that the SSL/TLS requests an EVP "handle"
> for each key that it wants to use, this handle then maps (indirectly)
> to a structure passed to the engine, which is unique to each key.
>
> A correctly implemented engine is supposed to use that structure to
> tell the difference between different keys stored in the actual
> hardware.
>
> For the case of GCM key/IV pairs, it may be that in some situations
> OpenSSL requests more than one EVP key instance for the same key,
> typically to allow each to have its own independent state (for GCM,
> this is the counter, for CBC it would be the IV chaining from block
> to block).  The simple solution is to just treat them as different
> keys, but if this uses too many hardware key storage locations, an
> engine may use some way to recognize the reused key, share the
> hardware object and keep count of how many "handles" point to that
> key.
>
>
>
> Enjoy
>
> Jakob
> --
> Jakob Bohm, CIO, Partner, WiseMo A/S.  https://www.wisemo.com
> Transformervej 29, 2860 Søborg, Denmark.  Direct +45 31 13 16 10
> This public discussion message is non-binding and may contain errors.
> WiseMo - Remote Service Management for PCs, Phones and Embedded
>
> --
> openssl-users mailing list
> To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users
>
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Re: [openssl-users] Multiple client connection to Nginx server

[Jakob Bohm via openssl-users]

On 12/12/2018 12:54, ASHIQUE CK wrote:

Hi,
Any help on this ?

On Wed, Dec 12, 2018 at 3:03 PM ASHIQUE CK > wrote:


Hi,
We are using a Crypto Accelerator Engine to offload AESGCM and RSA
parameters. Trying to connect multiple clients simultaneously with
a single Nginx server, which is using this accelerator.  The Key
and IV is passing only at handshake, and after handshake this set
of key and IV is using for all encryption and decryption. So at
Engine side, we are storing this Key and IV to a buffer and while
encrypting/decrypting , this Key and IV is used from this buffer.
But, while multiple client connects, the last saved Key/IV is
getting for all clients.
        So, is there any way to get a unique ID foer each client
connection ?



The following assumes that the accelerator is accessed using an
OpenSSL "engine" plugin, if instead you are inserting code in NGINX
to hand over the complete SSL/TLS record processing to the hardware,
then a different approach is needed.

OpenSSL Crypto Engines are not limited to SSL/TLS but can be used
for other tasks using the OpenSSL libcrypto library.

Thus the way this works is that the SSL/TLS requests an EVP "handle"
for each key that it wants to use, this handle then maps (indirectly)
to a structure passed to the engine, which is unique to each key.

A correctly implemented engine is supposed to use that structure to
tell the difference between different keys stored in the actual
hardware.

For the case of GCM key/IV pairs, it may be that in some situations
OpenSSL requests more than one EVP key instance for the same key,
typically to allow each to have its own independent state (for GCM,
this is the counter, for CBC it would be the IV chaining from block
to block).  The simple solution is to just treat them as different
keys, but if this uses too many hardware key storage locations, an
engine may use some way to recognize the reused key, share the
hardware object and keep count of how many "handles" point to that
key.



Enjoy

Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S.  https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark.  Direct +45 31 13 16 10
This public discussion message is non-binding and may contain errors.
WiseMo - Remote Service Management for PCs, Phones and Embedded

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Re: [openssl-users] Multiple client connection to Nginx server

[ASHIQUE CK]

Hi,
Any help on this ?

On Wed, Dec 12, 2018 at 3:03 PM ASHIQUE CK  wrote:

> Hi,
> We are using a Crypto Accelerator Engine to offload AESGCM and RSA
> parameters. Trying to connect multiple clients simultaneously with a single
> Nginx server, which is using this accelerator.  The Key and IV is passing
> only at handshake, and after handshake this set of key and IV is using for
> all encryption and decryption. So at Engine side, we are storing this Key
> and IV to a buffer and while encrypting/decrypting , this Key and IV is
> used from this buffer. But, while multiple client connects, the last saved
> Key/IV is getting for all clients.
> So, is there any way to get a unique ID foer each client
> connection ?
>
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