Change in pysim[master]: commands: better exception string for authentication failures

[dexter]

dexter has uploaded this change for review. ( https://gerrit.osmocom.org/c/pysim/+/23423 )


Change subject: commands: better exception string for authentication failures
......................................................................

commands: better exception string for authentication failures

At the moment we use the send_apdu_checksw() method to send the APDU for
ADM authentication. This method only checks if the command returns with
sw = 9000. If not it raises an exception that the sw is not as expected.
The user may think that this is a problem with thr reader, pcscd or
pySim in the first place and may try multiple times until the card is
permanently locked. A better execption string that also displays the
tries which are left may be helpful.

Change-Id: Icf428831094f8c1045eefaa8cb2b92e6a36b0c13
Related: OS#4963
---
M pySim/commands.py
1 file changed, 4 insertions(+), 1 deletion(-)



  git pull ssh://gerrit.osmocom.org:29418/pysim refs/changes/23/23423/1

diff --git a/pySim/commands.py b/pySim/commands.py
index 2fb1041..9aed588 100644
--- a/pySim/commands.py
+++ b/pySim/commands.py
@@ -205,4 +205,7 @@
 
 	def verify_chv(self, chv_no, code):
 		fc = rpad(b2h(code), 16)
-		return self._tp.send_apdu_checksw(self.cla_byte + '2000' + ('%02X' % chv_no) + '08' + fc)
+		data, sw = self._tp.send_apdu(self.cla_byte + '2000' + ('%02X' % chv_no) + '08' + fc)
+		if (sw != '9000'):
+			raise RuntimeError('Failed to authenticate with ADM key %s, %i tries left.' % (code, int(sw[3])))
+		return (data,sw)

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Gerrit-Project: pysim
Gerrit-Branch: master
Gerrit-Change-Id: Icf428831094f8c1045eefaa8cb2b92e6a36b0c13
Gerrit-Change-Number: 23423
Gerrit-PatchSet: 1
Gerrit-Owner: dexter <pmaier at sysmocom.de>
Gerrit-MessageType: newchange
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