How to fix cups.IPPError: (4096, 'Unauthorized') ? Using cups with pycups

Question

我正在设置一个 python 应用程序来监控 cups 服务器。我正在使用 cups wrapper pycups。 python 应用程序与 cups 在同一台服务器上。创建打印作业并获取打印机信息和作业状态的调用工作正常，但是当我尝试 reject/disable 打印机或取消作业时，我收到以下错误：cups.IPPError: (4096, 'Unauthorized')

我已经尝试在 cupsd.conf 文件中使用多个配置（当然还重新启动了 cups 服务），但是 none 似乎可以正常工作（甚至尝试删除所有策略块）。

这是我的 cupsd.conf（删除了 <Policy authenticated> 块）

LogLevel debug
ErrorPolicy retry-job
PageLogFormat
MaxLogSize 0
# Allow remote access
Port 631
Listen /var/run/cups/cups.sock
Browsing On
BrowseLocalProtocols none
DefaultAuthType Basic
WebInterface Yes
DefaultEncryption Never
<Location />
  Require user @SYSTEM
  Satisfy any
  # Allow remote administration...
  Order allow,deny
  Allow 127.0.0.1
  Allow localhost
</Location>
<Location /admin>
  AuthType Default
  Require user @SYSTEM
  # Allow remote administration...
  Order allow,deny
  Allow all
</Location>
<Location /admin/conf>
  AuthType Default
  Require user @SYSTEM
  # Allow remote access to the configuration files...
  Order allow,deny
  Allow all
</Location>
<Location /admin/log>
  AuthType Default
  Require user @SYSTEM
  Order allow,deny
  Allow all
  # Allow remote access to the log files...
  Order allow,deny
  Allow all
</Location>
<Policy default>
  JobPrivateAccess default
  JobPrivateValues default
  SubscriptionPrivateAccess default
  SubscriptionPrivateValues default
  <Limit Create-Job Print-Job Print-URI Validate-Job>
    AuthType None
    Satisfy any
    Order allow,deny
    Allow 127.0.0.1
  </Limit>
  <Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription Get-Notifications Reprocess-Job Cancel-Current-Job Suspend-Current-Job Resume-Job Cancel-My-Jobs Close-Job CUPS-Move-Job CUPS-Get-Document>
    Order allow,deny
    Require user @SYSTEM
    Satisfy any
    AuthType None
    Allow localhost
    Allow 127.0.0.1
  </Limit>
  <Limit CUPS-Add-Modify-Printer CUPS-Delete-Printer CUPS-Add-Modify-Class CUPS-Delete-Class CUPS-Set-Default CUPS-Get-Devices>
    AuthType None
    Order allow,deny
    Require user @SYSTEM
    Satisfy any
    Allow 127.0.0.1
  </Limit>
  <Limit Pause-Printer Resume-Printer Enable-Printer Disable-Printer Pause-Printer-After-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer Activate-Printer Restart-Printer Shutdown-Printer Startup-Printer Promote-Job Schedule-Job-After Cancel-Jobs CUPS-Accept-Jobs CUPS-Reject-Jobs>
    Order allow,deny
    Satisfy any
    Allow 127.0.0.1
    Allow localhost
  </Limit>
  <Limit CUPS-Authenticate-Job>
    Require user @OWNER @SYSTEM
    Order allow,deny
    Satisfy any
    AuthType None
    Allow 127.0.0.1
  </Limit>
  <Limit All>
    Order allow,deny
  </Limit>
</Policy>

每次我尝试禁用打印机或取消作业时，杯子 error_log 都会显示此信息：

D [29/Oct/2019:18:52:47 +0000] [Client 21] Accepted from localhost:55986 (IPv6)
D [29/Oct/2019:18:52:47 +0000] [Client 21] Waiting for request.
D [29/Oct/2019:18:52:47 +0000] [Client 21] POST /admin/ HTTP/1.1
D [29/Oct/2019:18:52:47 +0000] cupsdSetBusyState: newbusy="Active clients", busy="Not busy"
D [29/Oct/2019:18:52:47 +0000] [Client 21] Read: status=200
D [29/Oct/2019:18:52:47 +0000] [Client 21] No authentication data provided.
D [29/Oct/2019:18:52:47 +0000] cupsdIsAuthorized: username=""
D [29/Oct/2019:18:52:47 +0000] [Client 21] cupsdSendHeader: code=401, type="text/html", auth_type=0
D [29/Oct/2019:18:52:47 +0000] [Client 21] WWW-Authenticate: , trc=\"y\"
D [29/Oct/2019:18:52:47 +0000] [Client 21] Closing connection.
D [29/Oct/2019:18:52:47 +0000] cupsdSetBusyState: newbusy="Not busy", busy="Active clients"

每次我尝试禁用打印机或取消作业时，杯子 access_log 都会记录此信息：localhost - - [29/Oct/2019:17:15:16 +0000] "POST /admin/ HTTP/1.1" 401 0 - -

Answer 1

解决了，我还必须配置位置/admin。

<Location /admin>
  AuthType Default
  Require user @SYSTEM
  Satisfy any
  Order allow,deny
  Allow localhost
</Location>

How to fix cups.IPPError: (4096, 'Unauthorized') ? Using cups with pycups

How to fix cups.IPPError: (4096, 'Unauthorized') ? Using cups with pycups

cups

ubuntu-16.04

pycups