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diff --git a/doc/man/pam.3 b/doc/man/pam.3 new file mode 100644 index 0000000..63f3e76 --- /dev/null +++ b/doc/man/pam.3 @@ -0,0 +1,302 @@ +'\" t +.\" Title: pam +.\" Author: [FIXME: author] [see http://docbook.sf.net/el/author] +.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/> +.\" Date: 09/03/2021 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" Language: English +.\" +.TH "PAM" "3" "09/03/2021" "Linux-PAM Manual" "Linux-PAM Manual" +.\" ----------------------------------------------------------------- +.\" * Define some portability stuff +.\" ----------------------------------------------------------------- +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" http://bugs.debian.org/507673 +.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.ie \n(.g .ds Aq \(aq +.el .ds Aq ' +.\" ----------------------------------------------------------------- +.\" * set default formatting +.\" ----------------------------------------------------------------- +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.\" ----------------------------------------------------------------- +.\" * MAIN CONTENT STARTS HERE * +.\" ----------------------------------------------------------------- +.SH "NAME" +pam \- Pluggable Authentication Modules Library +.SH "SYNOPSIS" +.sp +.ft B +.nf +#include <security/pam_appl\&.h> +.fi +.ft +.sp +.ft B +.nf +#include <security/pam_modules\&.h> +.fi +.ft +.sp +.ft B +.nf +#include <security/pam_ext\&.h> +.fi +.ft +.SH "DESCRIPTION" +.PP +\fBPAM\fR +is a system of libraries that handle the authentication tasks of applications (services) on the system\&. The library provides a stable general interface (Application Programming Interface \- API) that privilege granting programs (such as +\fBlogin\fR(1) +and +\fBsu\fR(1)) defer to to perform standard authentication tasks\&. +.SS "Initialization and Cleanup" +.PP +The +\fBpam_start\fR(3) +function creates the PAM context and initiates the PAM transaction\&. It is the first of the PAM functions that needs to be called by an application\&. The transaction state is contained entirely within the structure identified by this handle, so it is possible to have multiple transactions in parallel\&. But it is not possible to use the same handle for different transactions, a new one is needed for every new context\&. +.PP +The +\fBpam_end\fR(3) +function terminates the PAM transaction and is the last function an application should call in the PAM context\&. Upon return the handle pamh is no longer valid and all memory associated with it will be invalid\&. It can be called at any time to terminate a PAM transaction\&. +.SS "Authentication" +.PP +The +\fBpam_authenticate\fR(3) +function is used to authenticate the user\&. The user is required to provide an authentication token depending upon the authentication service, usually this is a password, but could also be a finger print\&. +.PP +The +\fBpam_setcred\fR(3) +function manages the user\*(Aqs credentials\&. +.SS "Account Management" +.PP +The +\fBpam_acct_mgmt\fR(3) +function is used to determine if the user\*(Aqs account is valid\&. It checks for authentication token and account expiration and verifies access restrictions\&. It is typically called after the user has been authenticated\&. +.SS "Password Management" +.PP +The +\fBpam_chauthtok\fR(3) +function is used to change the authentication token for a given user on request or because the token has expired\&. +.SS "Session Management" +.PP +The +\fBpam_open_session\fR(3) +function sets up a user session for a previously successful authenticated user\&. The session should later be terminated with a call to +\fBpam_close_session\fR(3)\&. +.SS "Conversation" +.PP +The PAM library uses an application\-defined callback to allow a direct communication between a loaded module and the application\&. This callback is specified by the +\fIstruct pam_conv\fR +passed to +\fBpam_start\fR(3) +at the start of the transaction\&. See +\fBpam_conv\fR(3) +for details\&. +.SS "Data Objects" +.PP +The +\fBpam_set_item\fR(3) +and +\fBpam_get_item\fR(3) +functions allows applications and PAM service modules to set and retrieve PAM information\&. +.PP +The +\fBpam_get_user\fR(3) +function is the preferred method to obtain the username\&. +.PP +The +\fBpam_set_data\fR(3) +and +\fBpam_get_data\fR(3) +functions allows PAM service modules to set and retrieve free\-form data from one invocation to another\&. +.SS "Environment and Error Management" +.PP +The +\fBpam_putenv\fR(3), +\fBpam_getenv\fR(3) +and +\fBpam_getenvlist\fR(3) +functions are for maintaining a set of private environment variables\&. +.PP +The +\fBpam_strerror\fR(3) +function returns a pointer to a string describing the given PAM error code\&. +.SH "RETURN VALUES" +.PP +The following return codes are known by PAM: +.PP +PAM_ABORT +.RS 4 +Critical error, immediate abort\&. +.RE +.PP +PAM_ACCT_EXPIRED +.RS 4 +User account has expired\&. +.RE +.PP +PAM_AUTHINFO_UNAVAIL +.RS 4 +Authentication service cannot retrieve authentication info\&. +.RE +.PP +PAM_AUTHTOK_DISABLE_AGING +.RS 4 +Authentication token aging disabled\&. +.RE +.PP +PAM_AUTHTOK_ERR +.RS 4 +Authentication token manipulation error\&. +.RE +.PP +PAM_AUTHTOK_EXPIRED +.RS 4 +Authentication token expired\&. +.RE +.PP +PAM_AUTHTOK_LOCK_BUSY +.RS 4 +Authentication token lock busy\&. +.RE +.PP +PAM_AUTHTOK_RECOVERY_ERR +.RS 4 +Authentication information cannot be recovered\&. +.RE +.PP +PAM_AUTH_ERR +.RS 4 +Authentication failure\&. +.RE +.PP +PAM_BUF_ERR +.RS 4 +Memory buffer error\&. +.RE +.PP +PAM_CONV_ERR +.RS 4 +Conversation failure\&. +.RE +.PP +PAM_CRED_ERR +.RS 4 +Failure setting user credentials\&. +.RE +.PP +PAM_CRED_EXPIRED +.RS 4 +User credentials expired\&. +.RE +.PP +PAM_CRED_INSUFFICIENT +.RS 4 +Insufficient credentials to access authentication data\&. +.RE +.PP +PAM_CRED_UNAVAIL +.RS 4 +Authentication service cannot retrieve user credentials\&. +.RE +.PP +PAM_IGNORE +.RS 4 +The return value should be ignored by PAM dispatch\&. +.RE +.PP +PAM_MAXTRIES +.RS 4 +Have exhausted maximum number of retries for service\&. +.RE +.PP +PAM_MODULE_UNKNOWN +.RS 4 +Module is unknown\&. +.RE +.PP +PAM_NEW_AUTHTOK_REQD +.RS 4 +Authentication token is no longer valid; new one required\&. +.RE +.PP +PAM_NO_MODULE_DATA +.RS 4 +No module specific data is present\&. +.RE +.PP +PAM_OPEN_ERR +.RS 4 +Failed to load module\&. +.RE +.PP +PAM_PERM_DENIED +.RS 4 +Permission denied\&. +.RE +.PP +PAM_SERVICE_ERR +.RS 4 +Error in service module\&. +.RE +.PP +PAM_SESSION_ERR +.RS 4 +Cannot make/remove an entry for the specified session\&. +.RE +.PP +PAM_SUCCESS +.RS 4 +Success\&. +.RE +.PP +PAM_SYMBOL_ERR +.RS 4 +Symbol not found\&. +.RE +.PP +PAM_SYSTEM_ERR +.RS 4 +System error\&. +.RE +.PP +PAM_TRY_AGAIN +.RS 4 +Failed preliminary check by password service\&. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +User not known to the underlying authentication module\&. +.RE +.SH "SEE ALSO" +.PP +\fBpam_acct_mgmt\fR(3), +\fBpam_authenticate\fR(3), +\fBpam_chauthtok\fR(3), +\fBpam_close_session\fR(3), +\fBpam_conv\fR(3), +\fBpam_end\fR(3), +\fBpam_get_data\fR(3), +\fBpam_getenv\fR(3), +\fBpam_getenvlist\fR(3), +\fBpam_get_item\fR(3), +\fBpam_get_user\fR(3), +\fBpam_open_session\fR(3), +\fBpam_putenv\fR(3), +\fBpam_set_data\fR(3), +\fBpam_set_item\fR(3), +\fBpam_setcred\fR(3), +\fBpam_start\fR(3), +\fBpam_strerror\fR(3) +.SH "NOTES" +.PP +The +\fIlibpam\fR +interfaces are only thread\-safe if each thread within the multithreaded application uses its own PAM handle\&. |