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diff --git a/doc/man/pam.3 b/doc/man/pam.3 new file mode 100644 index 00000000..b6033370 --- /dev/null +++ b/doc/man/pam.3 @@ -0,0 +1,455 @@ +.\" Title: pam +.\" Author: [FIXME: author] [see http://docbook.sf.net/el/author] +.\" Generator: DocBook XSL Stylesheets v1.74.0 <http://docbook.sf.net/> +.\" Date: 03/02/2009 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" Language: English +.\" +.TH "PAM" "3" "03/02/2009" "Linux-PAM Manual" "Linux-PAM Manual" +.\" ----------------------------------------------------------------- +.\" * (re)Define some macros +.\" ----------------------------------------------------------------- +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" toupper - uppercase a string (locale-aware) +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.de toupper +.tr aAbBcCdDeEfFgGhHiIjJkKlLmMnNoOpPqQrRsStTuUvVwWxXyYzZ +\\$* +.tr aabbccddeeffgghhiijjkkllmmnnooppqqrrssttuuvvwwxxyyzz +.. +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" SH-xref - format a cross-reference to an SH section +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.de SH-xref +.ie n \{\ +.\} +.toupper \\$* +.el \{\ +\\$* +.\} +.. +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" SH - level-one heading that works better for non-TTY output +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.de1 SH +.\" put an extra blank line of space above the head in non-TTY output +.if t \{\ +.sp 1 +.\} +.sp \\n[PD]u +.nr an-level 1 +.set-an-margin +.nr an-prevailing-indent \\n[IN] +.fi +.in \\n[an-margin]u +.ti 0 +.HTML-TAG ".NH \\n[an-level]" +.it 1 an-trap +.nr an-no-space-flag 1 +.nr an-break-flag 1 +\." make the size of the head bigger +.ps +3 +.ft B +.ne (2v + 1u) +.ie n \{\ +.\" if n (TTY output), use uppercase +.toupper \\$* +.\} +.el \{\ +.nr an-break-flag 0 +.\" if not n (not TTY), use normal case (not uppercase) +\\$1 +.in \\n[an-margin]u +.ti 0 +.\" if not n (not TTY), put a border/line under subheading +.sp -.6 +\l'\n(.lu' +.\} +.. +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" SS - level-two heading that works better for non-TTY output +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.de1 SS +.sp \\n[PD]u +.nr an-level 1 +.set-an-margin +.nr an-prevailing-indent \\n[IN] +.fi +.in \\n[IN]u +.ti \\n[SN]u +.it 1 an-trap +.nr an-no-space-flag 1 +.nr an-break-flag 1 +.ps \\n[PS-SS]u +\." make the size of the head bigger +.ps +2 +.ft B +.ne (2v + 1u) +.if \\n[.$] \&\\$* +.. +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" BB/BE - put background/screen (filled box) around block of text +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.de BB +.if t \{\ +.sp -.5 +.br +.in +2n +.ll -2n +.gcolor red +.di BX +.\} +.. +.de EB +.if t \{\ +.if "\\$2"adjust-for-leading-newline" \{\ +.sp -1 +.\} +.br +.di +.in +.ll +.gcolor +.nr BW \\n(.lu-\\n(.i +.nr BH \\n(dn+.5v +.ne \\n(BHu+.5v +.ie "\\$2"adjust-for-leading-newline" \{\ +\M[\\$1]\h'1n'\v'+.5v'\D'P \\n(BWu 0 0 \\n(BHu -\\n(BWu 0 0 -\\n(BHu'\M[] +.\} +.el \{\ +\M[\\$1]\h'1n'\v'-.5v'\D'P \\n(BWu 0 0 \\n(BHu -\\n(BWu 0 0 -\\n(BHu'\M[] +.\} +.in 0 +.sp -.5v +.nf +.BX +.in +.sp .5v +.fi +.\} +.. +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" BM/EM - put colored marker in margin next to block of text +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.de BM +.if t \{\ +.br +.ll -2n +.gcolor red +.di BX +.\} +.. +.de EM +.if t \{\ +.br +.di +.ll +.gcolor +.nr BH \\n(dn +.ne \\n(BHu +\M[\\$1]\D'P -.75n 0 0 \\n(BHu -(\\n[.i]u - \\n(INu - .75n) 0 0 -\\n(BHu'\M[] +.in 0 +.nf +.BX +.in +.fi +.\} +.. +.\" ----------------------------------------------------------------- +.\" * 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 +.fam C +.ps -1 +.nf +#include <security/pam_appl\&.h> +.fi +.fam +.ps +1 +.ft +.sp +.ft B +.fam C +.ps -1 +.nf +#include <security/pam_modules\&.h> +.fi +.fam +.ps +1 +.ft +.sp +.ft B +.fam C +.ps -1 +.nf +#include <security/pam_ext\&.h> +.fi +.fam +.ps +1 +.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 userscredentials\&. +.SS "Account Management" +.PP +The +\fBpam_acct_mgmt\fR(3) +function is used to determine if the users 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 informations\&. +.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\&. |