Salt api not working

gistfile1.txt

my salt-api conf file 

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rest_cherrypy:
  port: 8000
  host: 0.0.0.0
  debug: True
  disable_ssl: true
  
externalauth:
  pam:
    salt:
       - .*
       - '@wheel'   # to allow access to all wheel modules
       - '@runner'  # to allow access to all runner modules
       - '@jobs'    # to allow access to the jobs runner and/or wheel module
       
       
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I have created a user called salt and set the password.
Here are the logs for pam 


salt -a pam '*' test.ping -l trace
[DEBUG   ] Reading configuration from /etc/salt/master
[DEBUG   ] Including configuration from '/etc/salt/master.d/master.conf'
[DEBUG   ] Reading configuration from /etc/salt/master.d/master.conf
[DEBUG   ] Including configuration from '/etc/salt/master.d/reactor.conf'
[DEBUG   ] Reading configuration from /etc/salt/master.d/reactor.conf
[DEBUG   ] Including configuration from '/etc/salt/master.d/salt-api.conf'
[DEBUG   ] Reading configuration from /etc/salt/master.d/salt-api.conf
[DEBUG   ] Using cached minion ID from /etc/salt/minion_id: salt-master
[DEBUG   ] Missing configuration file: /root/.saltrc
[TRACE   ] The required configuration section, 'fluent_handler', was not found the in the configuration. Not loading the fluent logging handlers module.
[TRACE   ] None of the required configuration sections, 'logstash_udp_handler' and 'logstash_zmq_handler', were found in the configuration. Not loading the Logstash logging handlers module.
[DEBUG   ] Configuration file path: /etc/salt/master
[WARNING ] Insecure logging configuration detected! Sensitive data may be logged.
[DEBUG   ] Reading configuration from /etc/salt/master
[DEBUG   ] Including configuration from '/etc/salt/master.d/master.conf'
[DEBUG   ] Reading configuration from /etc/salt/master.d/master.conf
[DEBUG   ] Including configuration from '/etc/salt/master.d/reactor.conf'
[DEBUG   ] Reading configuration from /etc/salt/master.d/reactor.conf
[DEBUG   ] Including configuration from '/etc/salt/master.d/salt-api.conf'
[DEBUG   ] Reading configuration from /etc/salt/master.d/salt-api.conf
[DEBUG   ] Using cached minion ID from /etc/salt/minion_id: salt-master
[DEBUG   ] Missing configuration file: /root/.saltrc
[DEBUG   ] MasterEvent PUB socket URI: /var/run/salt/master/master_event_pub.ipc
[DEBUG   ] MasterEvent PULL socket URI: /var/run/salt/master/master_event_pull.ipc
[DEBUG   ] LazyLoaded pam.auth
username: salt
password:
[DEBUG   ] Initializing new AsyncZeroMQReqChannel for ('/etc/salt/pki/master', 'salt-master_master', 'tcp://127.0.0.1:4506', 'clear')
[TRACE   ] Inserted key into loop_instance_map id 140408101590080 for key ('/etc/salt/pki/master', 'salt-master_master', 'tcp://127.0.0.1:4506', 'clear') and process 28430
[DEBUG   ] Initializing new IPCClient for path: /var/run/salt/master/master_event_pub.ipc
[TRACE   ] IPCClient: Connecting to socket: /var/run/salt/master/master_event_pub.ipc
[DEBUG   ] LazyLoaded nested.output
[TRACE   ] data = Failed to authenticate! This is most likely because this user is not permitted to execute commands, but there is a small possibility that a disk error occurred (check disk/inode usage).
Failed to authenticate! This is most likely because this user is not permitted to execute commands, but there is a small possibility that a disk error occurred (check disk/inode usage).

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Versions: 


salt-master:/etc/salt/master.d# salt-api --version
salt-api 2017.7.1 (Nitrogen)

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salt-master:/etc/salt/master.d# salt --versions-report
Salt Version:
           Salt: 2017.7.1

Dependency Versions:
           cffi: Not Installed
       cherrypy: 3.5.0
       dateutil: 2.4.2
      docker-py: Not Installed
          gitdb: 0.6.4
      gitpython: 1.0.1
          ioflo: Not Installed
         Jinja2: 2.8
        libgit2: Not Installed
        libnacl: Not Installed
       M2Crypto: Not Installed
           Mako: 1.0.3
   msgpack-pure: Not Installed
 msgpack-python: 0.4.6
   mysql-python: Not Installed
      pycparser: Not Installed
       pycrypto: 2.6.1
   pycryptodome: Not Installed
         pygit2: Not Installed
         Python: 2.7.12 (default, Nov 20 2017, 18:23:56)
   python-gnupg: Not Installed
         PyYAML: 3.11
          PyZMQ: 15.2.0
RAET: Not Installed
          smmap: 0.9.0
        timelib: Not Installed
        Tornado: 4.2.1
            ZMQ: 4.1.4

System Versions:
           dist: Ubuntu 16.04 xenial
         locale: UTF-8
        machine: x86_64
        release: 4.4.0-1038-aws
         system: Linux
        version: Ubuntu 16.04 xenial
        
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Salt-master debug logs 


2017-12-28 18:56:50,026 [salt.auth        ][WARNING ][17583] Authentication failure of type "eauth" occurred.
2017-12-28 18:56:50,027 [salt.master      ][WARNING ][17583] Authentication failure of type "eauth" occurred.