Replace the "dispatching" flag with a pam_chain_t pointer. It is set
to point at the currently executing module right before calling the
module, and cleared right after the module returns. Note that this
isn't intended to prevent reentrancy in multi-threaded applications,
but simply to prevent modules from using the application interface.
When recursion is detected, return PAM_ABORT rather than
PAM_SYSTEM_ERR, since this is a programmatical error rather than
a runtime one.
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to restructure it later on.
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detect and prevent indirect recursion.
Fail immediately if the requested chain is empty.
If a module couldn't be loaded, or doesn't provide the requested
service, treat it as a normal failure instead of terminating the
chain. (Solaris actually ignores this condition!)
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required. Although style(9) doesn't say anything about it, this
seems to be the preferred form.
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Clear environment.
Use pam_set_item() rather than free() to clear items so they get
properly clobbered.
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function name, and wrap it in a macro called openpam_log().
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in the error message. Avoid logging it twice.
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#include that I hadn't spotted since it wasn't getting compiled.
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Prototype it in the new <security/openpam.h> header. Move the
prototype for openpam_log() there too (as well as the log level
constants) so modules and applications can use it if they want to.
Have lib/openpam.h include <security/openpam.h>.
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The basics (pam_start(), pam_end(), pam_strerror(), item-,
data- and environment-related functions and the six PAM
primitives) are implemented. A stub is provided for
pam_get_user(), which is not yet implemented. Stubs are also
provided for XSSO mapping and secondary authentication, though
they are not built and will probably not be implemented for
quite some time.
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Dag-Erling Smørgrav