How to make a secure HTTP request from ABAP progra...

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Hi All,

I have a requirement to call an external webservice running on REST architecture from abap program. Since the web service is not running on SOAP protocol, I am unable to use the SOAMANAGER to configure the consumer proxy to make the call to external web service.

I am able to directly call the web service running on REST architecture by using the CL_HTTP* utility class by passing the url with parameters for consuming the web service. But I need to make sure the HTTP request is encrypted before it leaves the SAP system.

Please provide some inputs on encrypting the HTTP request from ABAP program.

Regards,

Manjiyil

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Answers (2)

Hi,

In the CL_HTTP* Utility, use mode parameter value 2 which is for HTTPS.

HTTPS is an encrypted transmission protocol for web services.

regards,

Ashish Rawat

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Hi Joseph,

Not sure I really understood the question, but if I did, can't you make an HTTPS call instead of HTTP?

Regards,

Custodio

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Hi Custodio,

We are concatenating the appid and token along with URL for calling the webservice. I was wondering is there any way to garble the app_id and token when making the https request, so it is secure, or if we transmit via HTTPS instead of HTTP is it encrypted already.

If I write some encryption logic, should the webservice server also implement the decryption logic to accept the request and respond.

I have attached the code for your reference:

*-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------*

* Declarations
DATA lo_client TYPE REF TO if_http_client.
DATA lo_conv TYPE REF TO cl_abap_conv_in_ce.

DATA lv_result_url       TYPE string.
DATA lv_bin                 TYPE xstring.
DATA lv_response       TYPE string.

DATA lwa_layout TYPE slis_layout_alv.
DATA lt_data TYPE srt_xml_data_tab.

* Create HTTP CAll URL
CALL METHOD cl_http_client=>create_by_url
EXPORTING
    url                      = 'http://example/calculate.xml'
    proxy_host        = 'web.proxy.com'
    proxy_service    = '4999'
IMPORTING
    client                 = lo_client
EXCEPTIONS
    argument_not_found = 1
    plugin_not_active      = 2
    internal_error             = 3
    OTHERS                   = 4.

IF sy-subrc <> 0.
MESSAGE e000(z_xyz) WITH 'Error during URL creation'.
ENDIF.

* Disabling the proxy authentication
lo_client->propertytype_logon_popup = lo_client->co_disabled.

* Pass proxy authentication details
lo_client->authenticate(
EXPORTING
    proxy_authentication = abap_true
    username                  = 'joseph'
    password                   = 'abcd' ).

lo_client->request->set_method( if_http_request=>co_request_method_get ).

* Construct the URL
CONCATENATE
       'http://example/calculate.xml?'
       'app_id=abc'
       '&token=xyz'
       INTO lv_result_url RESPECTING BLANKS.

* Set URL to request
cl_http_utility=>set_request_uri( request = lo_client->request uri = lv_result_url ).

* Send the HTTP request
CALL METHOD lo_client->send
EXCEPTIONS
    http_communication_failure = 1
    http_invalid_state                 = 2
    http_processing_failed         = 3
    http_invalid_timeout             = 4
    OTHERS                              = 5.
IF sy-subrc <> 0.
MESSAGE e000(z_xyz) WITH 'Error during HTTP send'.
ENDIF.

* HTTP call receive
CALL METHOD lo_client->receive
EXCEPTIONS
    http_communication_failure = 1
    http_invalid_state                 = 2
    http_processing_failed         = 3
    OTHERS                              = 4.
IF sy-subrc <> 0.
MESSAGE e000(z_xyz) WITH 'Error during HTTP receive'.
ENDIF.

* Get Response data
lv_bin = lo_client->response->get_data( ).

CALL FUNCTION 'SRTUTIL_CONVERT_XML_TO_TABLE'
EXPORTING
xdoc = lv_bin
IMPORTING
data = lt_data.

lwa_layout-colwidth_optimize = abap_true.
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
EXPORTING
    i_structure_name = 'SRT_XML_DATA'
    is_layout               = lwa_layout
TABLES
    t_outtab                = lt_data
EXCEPTIONS
    program_error      = 1
    OTHERS              = 2.
IF sy-subrc <> 0.
* Implement suitable error handling here
ENDIF.

CALL METHOD lo_client->close
EXCEPTIONS
http_invalid_state = 1
OTHERS = 2.
IF sy-subrc <> 0.
MESSAGE e000(z_xyz) WITH 'Error closing HTTP call'.
ENDIF.

*-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------*

Please suggest what changes I need to make the code secure.

Regards,

Joseph M

Hi Joseph,

My understanding is you generate your URL with HTTPS and it will be already secured. You are right, if you create an encryption algorithm for your data, then the service will have to write the decryption logic hence adding complexity.

IMO send HTTPS is enough.

Regards,

Custodio

Hi All,

I am calling the HTTPS url from Internet explorer and I'm able to see the xml output.I'm am constructing the url based on the below code:

* Construct the URL

CONCATENATE

'https://example/calculate.xml?'

'app_id=abc'

'&token=xyz'

INTO lv_result_url RESPECTING BLANKS.

I downloaded the SSL certificates from the web service site and installed in STRUST transaction. I'm passing the certificate id when calling the method:

* Create HTTP CAll URL

CALL METHOD cl_http_client=>create_by_url

EXPORTING

url = 'https://example/calculate.xml''

proxy_host = 'web.proxy.com'

proxy_service = '4999'

ssl_id = 'WSSE'

IMPORTING

client = lo_client

EXCEPTIONS

argument_not_found = 1

plugin_not_active = 2

internal_error = 3

OTHERS = 4.

But when the method receive is called using the below code, I am getting a HTTP_COMMUNICATION_FAILURE

* HTTP call receive

CALL METHOD lo_client->receive

EXCEPTIONS

http_communication_failure = 1

http_invalid_state = 2

http_processing_failed = 3

OTHERS = 4.

I debugged the receive method and found that error 'ICM_HTTP_SSL_ERROR' is being raised inside the method. I followed the steps mentioned in existing threads on resolving the errors like soft restarting the ICM server. But it is not resolving my issue.

Since I'm passing the app_id and token when constructing the url, I'm not sure what authentication should be used when calling HTTPS. We are not entering user id and password. app_id and token uniquely identifies and returns the result when called from internet explorer. I have installed the certificate as well in STRUST. Please provide guidance on how I can proceed on this issue.

Regards,

Joseph M

Hi All,

I got the HTTPS to work by creating HTTP destination in SM59

* Declarations
DATA lo_client TYPE REF TO if_http_client.
DATA lo_conv TYPE REF TO cl_abap_conv_in_ce.

DATA lv_result_url      TYPE string.
DATA lv_bin                 TYPE xstring.
DATA lv_response       TYPE string.
DATA lv_httpcode        TYPE i.
DATA lv_reason           TYPE string.

DATA lwa_layout TYPE slis_layout_alv.
DATA lt_data TYPE srt_xml_data_tab.

CALL METHOD cl_http_client=>create_by_destination
EXPORTING
    destination              = 'HTTPS_DEST_1'
IMPORTING
    client                       = lo_client
EXCEPTIONS
    argument_not_found       = 1
    destination_not_found     = 2
    destination_no_authority = 3
    plugin_not_active             = 4
    internal_error                    = 5
    OTHERS                          = 6.
IF sy-subrc <> 0.
MESSAGE e000(z_xyz) WITH 'Error during URL creation'.
ENDIF.

lo_client->request->set_method( if_http_request=>co_request_method_get )."co_request_method_post ).

* Construct the URL without https:// ......(remaining details are maintained in SM59)
CONCATENATE '?app_id=abc'
                             '&token=xyz'
                             '&param1=p1'
                              INTO lv_result_url RESPECTING BLANKS.

* Set URL to request
cl_http_utility=>set_request_uri( request = lo_client->request uri = lv_result_url ).

*   get status of the response
CALL METHOD lo_client->response->get_status
IMPORTING
    code    = lv_httpcode
    reason = lv_reason.

* Get Response data
lv_bin = lo_client->response->get_data( ).

CALL FUNCTION 'SRTUTIL_CONVERT_XML_TO_TABLE'
EXPORTING
xdoc = lv_bin
IMPORTING
data = lt_data.

CALL METHOD lo_client->close
EXCEPTIONS
http_invalid_state = 1
OTHERS = 2.
IF sy-subrc <> 0.
MESSAGE e000(z_xyz) WITH 'Error closing HTTP call'.
ENDIF.

SM59 Settings:

url: https://example.com/search.xml?app_id=abc&token=xyz&param1=p1

1.Connection Type: G

2.Target host: example.com

3.Path prefix: /search.xml

4.Provide company proxy details

5.SSL certificate: DFAULT SSL Client(standard)

STRUST Settings:

Download and install SSL certificate under

1. System PSE

2. SSL client SSL Client (standard)

3. Add to ACL list

SMICM Settings:

1. Make sure HTTPS port is activated

I was able to call REST web service using these settings successfully. for some reason HTTP POST method was not working, I guess webservice needs to be configured to handle it.

Regards,

Joseph M

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