ssl SSLError outines:SSL_CTX_use_certificate_chain_file:PEM lib

Question

While trying to make a push test to my app I'm getting the following error:

Traceback (most recent call last):
  File "test.py", line 16, in <module>
    wrapper.notify()
  File "/usr/local/lib/python2.7/dist-packages/APNSWrapper-0.6.1-py2.7.egg/APNSWrapper/notifications.py", line 194, in notify
    apnsConnection.connect(apnsHost, self.apnsPort)
  File "/usr/local/lib/python2.7/dist-packages/APNSWrapper-0.6.1-py2.7.egg/APNSWrapper/connection.py", line 215, in connect
    self.context().connect(host, port)
  File "/usr/local/lib/python2.7/dist-packages/APNSWrapper-0.6.1-py2.7.egg/APNSWrapper/connection.py", line 161, in connect
    self.connectionContext.connect((host, port))
  File "/usr/lib/python2.7/ssl.py", line 331, in connect
    self._real_connect(addr, False)
  File "/usr/lib/python2.7/ssl.py", line 314, in _real_connect
    self.ca_certs, self.ciphers)
ssl.SSLError: [Errno 336445449] _ssl.c:365: error:140DC009:SSL routines:SSL_CTX_use_certificate_chain_file:PEM lib

And my script looks like:

#!/usr/bin/env python
from APNSWrapper import *

deviceToken = '****************************************************************'

# create wrapper
wrapper = APNSNotificationWrapper('cert.pem', True)

# create message
message = APNSNotification()
message.token(deviceToken)
message.badge(28)

# add message to tuple and send it to APNS server
wrapper.append(message)
wrapper.notify()

What is the cause of this error?

Answer 1

I've not run across that specific error before in Python, but it looks very much like OpenSSL choked on your .pem file - I'd speculate that the .pem file you are using isn't the right format for what Python asked OpenSSL to do. I've opened one of my known good .pem files, replaced the my personally identifying information and public/private keys with garbage data so you can get a feel for what a non-password protected .pem should look like.

The PEM file contains both your public and private key. Never post them for others to look at as they then have the ability to see your private keys and could then impersonate you or your servers!

NOTE: The following code listing is an entirely faked, randomized set of data for demonstrating the .pem file format. This sample PEM would fail even the most casual of verifications given the not so hidden "THIS_IS_JUST_RANDOM_CHARACTERS" text where there should be actual key data instead of just random character data.

Bag Attributes
    friendlyName: Apple Development IOS Push Services: com.mycompany.myappidentifier
    localKeyID: 01 23 45 67 89 AB CD EF 01 23 45 67 89 AB CD EF 01 23 45 67 
subject=/UID=com.mycompany.myappidentifier/CN=Apple Development IOS Push Services: com.mycompany.myappidentifier/OU=ABC1234567/C=US
issuer=/C=US/O=Apple Inc./OU=Apple Worldwide Developer Relations/CN=Apple Worldwide Developer Relations Certification Authority
-----BEGIN CERTIFICATE-----
THIS_IS_JUST_RANDOM_CHARACTERS_90f0yGqSm7JmgJ0srvviZpn6cSMoCeymB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-----END CERTIFICATE-----
Bag Attributes
    friendlyName: Common Name From Keychain Access CSR Wizard
    localKeyID: AB CD EF 01 23 45 67 89 AB CD EF 01 23 45 67 89 AB CD EF 01 
Key Attributes: <No Attributes>
-----BEGIN RSA PRIVATE KEY-----
THIS_IS_JUST_RANDOM_CHARACTERS_1YKVrMNhmg68Qt026SWMxtaKiVtHG2yYS
V3gdLgqujtp4rpWONYoLQKhlW923yzrxYuSUhC8LiNDlAjicrJXZVj4vYhwdydSS
QBnDaxc5U2NYev0tCEbPTpYDERAsdE7WTBwaTuEyWEoqTsPQLucohKY2E7UzoZcZ
BttZaX0vLy3W7y22dSKtIghJMEy8MENjeJkET6Xaf4ozC7DNr2g1dBICPT42Hx77
GagtxA2OyxW7qkB8GTnOncXWDbli1y5eYIjb0GZNQVSmGEBl5ykNvhbzpqc53nfN
NJNMO1mEIaDo3GZIVfv3gpiNGpaplofix2DZJOaQBh4s0X3gwc3Y9f1Ta39tYdVh
h04JCDdliIfbjp4T6pDJQeebaBPczOne2gFHMOHGlxcfYbNzlqgBhzdoqH25nKN4
hThTUQioisjUrUayiyPkMAJFdKn37iff1XHOmCFEJqL7eMayeyLk55hWLLBi4Q7I
wUH9rbR2LnfXdCf25jyRbZQx3uKhjnwZrZL9Pg2OF9nvl1B1UnTtyOHP7uP989u1
qNiNIS347PLN2tvEIEaFQ26ESY9YpPhcpMWLpJEN6nyer1LcrRQfTPXnoqPKIEDc
KBnpPyvNxC7EeruwkwWbRdpuOPJ8hFKiY9SwSbJvPb4mBXmSo5mfKaZfy2IuJdTV
dTQ49Lq3rMDwYsRTAS6Id2I9lFruU5vXR7BtCP5u8QV480f6wU17IPn3mgezXtNU
R0SSEjVCGWQUZXvEmlLTnqD5T7IHlat7IbKvcaKp6skvJUFanKgCXn7PW6FzuQyF
QfbGEAmzEIq7UT83WOxCsbUR26kJutIejjcnZWZQ3tMG9wtZysYXkAiCDEMUdSZl
Y7h5oE5rVeYyT7SXtDhVnNeDmcqIO2VcHt7HFsVQVMUAalA9mnEMjHkxAbgp1mCo
NxdMzNb44IWAaSM6CmjjMt07GTJsjthXTreFoOm9oWGSIEo67piyIRJP8xmdOitB
ITLHC9h89kV4vfAJZrrCOxSlcsNADCAS1SJW6kzJn7CxVucnszKZ8sQdc8Xqvqsu
4CpFs1arZYZ3IE9dOY28LJuuegSBSf6EOTSHK5OOzL6IenrhTUbLSFQpoYF3yNo1
OfpoyVHltjCeqTHMQjhrY9cokfHsecRR8EZMAAxFDo3YvgVyLzvjvY114NMVkxHh
5sw7wL4xKE8UxzL4Eew1t8HjSlypLF7s5plq6wtOfEn9HYRKJVGYBT5x2oZm9m6b
rlVzKeASUuzOXBeNafwYOgXAFBq0i1lw7nkLfyZaeETfE00GxhceK6bnT0UfBMb5
rvU4Yz1pNhYvG4ZhKJYaiJvzQW6jSYFEyWh8hWPrSco42eMPYms0lxK9Fy4tbHuP
0XsjURq6aY9P6Cg1ugPM5ad3kOtr8MrJwRLmp94ucwJASuWXj48QH45sVaZbcsKU
ZwVfKpGke3urr9DtznZnv4QdBSlPhS3e4CihQDdhWZJMPxh1DNRrBWBn7xiOZqEm
oC7zbfjNtpvhOThz4MCDzJeCtGfI8irjdYFi2eqefZ6lLaoZFYBi
-----END RSA PRIVATE KEY-----

If your PEM has a different format (perhaps Binary? Missing the public or private key sections? Extra sections not present in this sample?) then you need to run a conversion or re-export your PEM from a PKCS#12 export from Keychain Access in OS X. The conversion step would vary based on what kind of file you actually have, so I can't give you any guidance there without additional information, but I can provide you with instructions for how to go about re-exporting a PEM from Keychain Access in OS X:

1. Open Keychain Access.
2. In the 'login' keychain, search the 'My Certificate' or 'All Items' category for 'Apple Production iOS Push Services: your.apps.app.id'
3. Right-Click the item that is returned from that search and select the 'Export' option.
4. Save the 'Personal Information Exchange (.p12)' file in an easily accessible location.
5. Specify a password for the .p12 file that you can remember and follow any on-screen prompts to authenticate with Keychain to export data.
6. Open Terminal and 'cd' into the directory containing the .p12 from the previous step.
7. Perform the following command against the .p12 filename: openssl pkcs12 -in FILENAME.p12 -out FILENAME.pem -nodes
8. When prompted, enter the .p12 file's password you created in step 5 and press enter.
9. Move the PEM to your server and update any code references if necessary.

Again, this is all speculation based on the error code you listed in your question, however give this a shot and let us know how things go.