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PKEXEC(1) | pkexec | PKEXEC(1) |
NAME¶
pkexec - Execute a command as another userSYNOPSIS¶
pkexec [--version]
[--disable-internal-agent] [ --help]
pkexec [--user username]
PROGRAM [ ARGUMENTS...]
DESCRIPTION¶
pkexec allows an authorized user to execute PROGRAM as another user. If username is not specified, then the program will be executed as the administrative super user, root.RETURN VALUE¶
Upon successful completion, the return value is the return value of PROGRAM. If the calling process is not authorized or an authorization could not be obtained through authentication or an error occured, pkexec exits with a return value of 127. If the authorization could not be obtained because the user dismissed the authentication dialog, pkexec exits with a return value of 126.AUTHENTICATION AGENT¶
pkexec, like any other PolicyKit application, will use the authentication agent registered for the calling process. However, if no authentication agent is available, then pkexec will register its own textual authentication agent. This behavior can be turned off by passing the --disable-internal-agent option.SECURITY NOTES¶
Executing a program as another user is a privileged operation. By default the required authorization (See the section called “REQUIRED AUTHORIZATIONS”) requires administrator authentication. In addition, the authentication dialog presented to the user will display the full path to the program to be executed so the user is aware of what will happen:[IMAGE][1]
The environment that PROGRAM will run it, will be set to a minimal known
and safe environment in order to avoid injecting code through LD_LIBRARY_PATH
or similar mechanisms. In addition the PKEXEC_UID environment variable is set
to the user id of the process invoking pkexec. As a result,
pkexec will not allow you to run X11 applications as another user since
the $DISPLAY and $XAUTHORITY environment variables are not set. These two
variables will be retained if the
org.freedesktop.policykit.exec.allow_gui annotation on an action is set
to a nonempty value; this is discouraged, though, and should only be used for
legacy programs.
+----------------------------------------------------------+ | Authenticate [X] | +----------------------------------------------------------+ | | | [Icon] Authentication is needed to run `/bin/bash' | | as the super user | | | | An application is attempting to perform an | | action that requires privileges. Authentication | | as the super user is required to perform this | | action. | | | | Password for root: [_________________________] | | | | [V] Details: | | Command: /bin/bash | | Run As: Super User (root) | | Action: org.freedesktop.policykit.exec | | Vendor: The PolicyKit Project | | | | [Cancel] [Authenticate] | +----------------------------------------------------------+
REQUIRED AUTHORIZATIONS¶
By default, the org.freedesktop.policykit.exec authorization is required unless an action definition file is present for the program in question. To require another authorization, it can be specified using the org.freedesktop.policykit.exec.path annotation on an action (See the section called “EXAMPLE” for details).EXAMPLE¶
To specify what kind of authorization is needed to execute the program /usr/bin/pk-example-frobnicate as another user, simply write an action definition file like this<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE policyconfig PUBLIC "-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN" "http://www.freedesktop.org/standards/PolicyKit/1/policyconfig.dtd"> <policyconfig> <vendor>Examples for the PolicyKit Project</vendor> <vendor_url>http://hal.freedesktop.org/docs/PolicyKit/</vendor_url> <action id="org.freedesktop.policykit.example.pkexec.run-frobnicate"> <description>Run the PolicyKit example program Frobnicate</description> <description xml:lang="da">Kør PolicyKit eksemplet Frobnicate</description> <message>Authentication is required to run the PolicyKit example program Frobnicate (user=$(user), program=$(program), command_line=$(command_line))</message> <message xml:lang="da">Autorisering er påkrævet for at afvikle PolicyKit eksemplet Frobnicate (user=$(user), program=$(program), command_line=$(command_line))</message> <icon_name>audio-x-generic</icon_name> <defaults> <allow_any>no</allow_any> <allow_inactive>no</allow_inactive> <allow_active>auth_self_keep</allow_active> </defaults> <annotate key="org.freedesktop.policykit.exec.path">/usr/bin/pk-example-frobnicate</annotate> </action> </policyconfig>
[IMAGE][2]
If the user is using the da_DK locale, the dialog looks like this:
+----------------------------------------------------------+ | Authenticate [X] | +----------------------------------------------------------+ | | | [Icon] Authentication is required to run the PolicyKit | | example program Frobnicate | | | | An application is attempting to perform an | | action that requires privileges. Authentication | | is required to perform this action. | | | | Password: [__________________________________] | | | | [V] Details: | | Command: /usr/bin/pk-example-frobnicate | | Run As: Super User (root) | | Action: org.fd.pk.example.pkexec.run-frobnicate | | Vendor: Examples for the PolicyKit Project | | | | [Cancel] [Authenticate] | +----------------------------------------------------------+
[IMAGE][3]
Note that pkexec does no validation of the ARGUMENTS passed to
PROGRAM. In the normal case (where administrator authentication is
required every time pkexec is used), this is not a problem since if the
user is an administrator he might as well just run pkexec bash to get
root.
However, if an action is used for which the user can retain authorization (or if
the user is implicitly authorized), such as with pk-example-frobnicate above,
this could be a security hole. Therefore, as a rule of thumb, programs for
which the default required authorization is changed, should never implicitly
trust user input (e.g. like any other well-written suid program).
+----------------------------------------------------------+ | Autorisering [X] | +----------------------------------------------------------+ | | | [Icon] Autorisering er påkrævet for at afvikle | | PolicyKit eksemplet Frobnicate | | | | Et program forsøger at udføre en handling der | | kræver privilegier. Autorisering er påkrævet. | | | | Kodeord: [___________________________________] | | | | [V] Detaljer: | | Bruger: Super User (root) | | Program: /usr/bin/pk-example-frobnicate | | Handling: org.fd.pk.example.pkexec.run-frobnicate | | Vendor: Examples for the PolicyKit Project | | | | [Annullér] [Autorisering] | +----------------------------------------------------------+
AUTHOR¶
Written by David Zeuthen <davidz@redhat.com> with a lot of help from many others.BUGS¶
Please send bug reports to either the distribution or the polkit-devel mailing list, see the link http://lists.freedesktop.org/mailman/listinfo/polkit-devel on how to subscribe.SEE ALSO¶
polkit(8), pkaction(1), pkcheck(1), pkttyagent(1)NOTES¶
- 1.
- /usr/share/gtk-doc/html/polkit-1/pkexec-bash.png
- 2.
- /usr/share/gtk-doc/html/polkit-1/pkexec-frobnicate.png
- 3.
- /usr/share/gtk-doc/html/polkit-1/pkexec-frobnicate-da.png
May 2009 | polkit |