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Document the pwd Casper service.
PR: 226102 Reviewed by: bcr@ Differential Revision: https://reviews.freebsd.org/D14605
This commit is contained in:
Mariusz Zaborski
parent
9ea857cf0f
commit
54442b3cfa
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=331119
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@ -24,4 +24,20 @@ CFLAGS+=-I${.CURDIR}
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HAS_TESTS=
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SUBDIR.${MK_TESTS}+= tests
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MAN+= cap_pwd.3
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MLINKS+=cap_pwd.3 libcap_pwd.3
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MLINKS+=cap_pwd.3 cap_getpwent.3
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MLINKS+=cap_pwd.3 cap_getpwnam.3
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MLINKS+=cap_pwd.3 cap_getpwuid.3
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MLINKS+=cap_pwd.3 cap_getpwent_r.3
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MLINKS+=cap_pwd.3 cap_getpwnam_r.3
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MLINKS+=cap_pwd.3 cap_getpwuid_r.3
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MLINKS+=cap_pwd.3 cap_setpassent.3
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MLINKS+=cap_pwd.3 cap_setpwent.3
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MLINKS+=cap_pwd.3 cap_endpwent.3
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MLINKS+=cap_pwd.3 cap_pwd_limit_cmds.3
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MLINKS+=cap_pwd.3 cap_pwd_limit_fields.3
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MLINKS+=cap_pwd.3 cap_pwd_limit_users.3
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.include <bsd.lib.mk>
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234
lib/libcasper/services/cap_pwd/cap_pwd.3
Normal file
234
lib/libcasper/services/cap_pwd/cap_pwd.3
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@ -0,0 +1,234 @@
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.\" Copyright (c) 2018 Mariusz Zaborski <oshogbo@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd March 18, 2018
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.Dt CAP_PWD 3
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.Os
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.Sh NAME
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.Nm cap_getpwent ,
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.Nm cap_getpwnam ,
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.Nm cap_getpwuid ,
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.Nm cap_getpwent_r ,
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.Nm cap_getpwnam_r ,
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.Nm cap_getpwuid_r ,
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.Nm cap_setpassent ,
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.Nm cap_setpwent ,
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.Nm cap_endpwent ,
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.Nm cap_pwd_limit_cmds ,
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.Nm cap_pwd_limit_fields ,
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.Nm cap_pwd_limit_users
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.Nd "library for password database operations in capability mode"
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.Sh LIBRARY
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.Lb libcap_grp
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.Sh SYNOPSIS
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.In libcasper.h
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.In casper/cap_pwd.h
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.Ft struct passwd *
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.Fn cap_getpwent "cap_channel_t *chan"
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.Ft struct passwd *
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.Fn cap_getpwnam "cap_channel_t *chan" "const char *login"
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.Ft struct passwd *
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.Fn cap_getpwuid "cap_channel_t *chan" "uid_t uid"
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.Ft int
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.Fn cap_getpwent_r "cap_channel_t *chan" "struct passwd *pwd" "char *buffer" "size_t bufsize" "struct passwd **result"
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.Ft int
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.Fn cap_getpwnam_r "cap_channel_t *chan" "const char *name" "struct passwd *pwd" "char *buffer" "size_t bufsize" "struct passwd **result"
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.Ft int
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.Fn cap_getpwuid_r "cap_channel_t *chan" "uid_t uid" "struct passwd *pwd" "char *buffer" "size_t bufsize" "struct passwd **result"
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.Ft int
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.Fn cap_setpassent "cap_channel_t *chan" "int stayopen"
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.Ft void
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.Fn cap_setpwent "cap_channel_t *chan"
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.Ft void
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.Fn cap_endpwent "cap_channel_t *chan"
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.Ft int
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.Fn cap_pwd_limit_cmds "cap_channel_t *chan" "const char * const *cmds" "size_t ncmds"
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.Ft int
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.Fn cap_pwd_limit_fields "cap_channel_t *chan" "const char * const *fields" "size_t nfields"
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.Ft int
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.Fn cap_pwd_limit_users "cap_channel_t *chan" "const char * const *names" "size_t nnames" "uid_t *uids" "size_t nuids"
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.Sh DESCRIPTION
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The functions
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.Fn cap_getpwent ,
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.Fn cap_getpwnam ,
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.Fn cap_getpwuid ,
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.Fn cap_getpwent_r ,
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.Fn cap_getpwnam_r ,
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.Fn cap_getpwuid_r ,
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.Fn cap_setpassent ,
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.Fn cap_setpwent ,
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and
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.Fn cap_endpwent
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are respectively equivalent to
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.Xr getpwent 3 ,
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.Xr getpwnam 3 ,
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.Xr getpwuid 3 ,
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.Xr getpwent_r 3 ,
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.Xr getpwnam_r 3 ,
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.Xr getpwuid_r 3 ,
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.Xr setpassent 3 ,
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.Xr setpwent 3 ,
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and
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.Xr cap_endpwent 3
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except that the connection to the
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.Nm system.pwd
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service needs to be provided.
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.Pp
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The
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.Fn cap_pwd_limit_cmds
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function limits the functions allowed in the service.
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The
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.Fa cmds
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variable can be set to
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.Dv getpwent ,
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.Dv getpwnam ,
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.Dv getpwuid ,
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.Dv getpwent_r ,
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.Dv getpwnam_r ,
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.Dv getpwuid_r ,
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.Dv setpassent ,
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.Dv setpwent ,
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or
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.Dv endpwent
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which will allow to use the function associated with the name.
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The
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.Fa ncmds
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variable contains the number of
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.Fa cmds
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provided.
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.Pp
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The
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.Fn cap_pwd_limit_fields
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function allows limit fields returned in the structure
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.Vt passwd .
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The
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.Fa fields
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variable can be set to
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.Dv pw_name ,
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.Dv pw_passwd ,
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.Dv pw_uid ,
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.Dv pw_gid ,
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.Dv pw_change ,
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.Dv pw_class ,
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.Dv pw_gecos ,
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.Dv pw_dir ,
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.Dv pw_shell ,
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.Dv pw_expire
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or
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.Dv pw_fields
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The field which was set as the limit will be returned, while the rest of the
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values not set this way will have default values.
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The
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.Fa nfields
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variable contains the number of
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.Fa fields
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provided.
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.Pp
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The
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.Fn cap_pwd_limit_users
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function allows to limit access to users.
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The
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.Fa names
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variable allows to limit users by name and the
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.Fa uids
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variable by the user number.
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The
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.Fa nnames
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and
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.Fa nuids
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variables provide numbers of limited names and uids.
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.Sh EXAMPLES
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The following example first opens a capability to casper and then uses this
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capability to create the
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.Nm system.pwd
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casper service and uses it to get a user name.
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.Bd -literal
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cap_channel_t *capcas, *cappwd;
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const char *cmds[] = { "getpwuid" };
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const char *fields[] = { "pw_name" };
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uid_t uid[] = { 1 };
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struct passwd *passwd;
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/* Open capability to Casper. */
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capcas = cap_init();
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if (capcas == NULL)
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err(1, "Unable to contact Casper");
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/* Enter capability mode sandbox. */
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if (cap_enter() < 0 && errno != ENOSYS)
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err(1, "Unable to enter capability mode");
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/* Use Casper capability to create capability to the system.pwd service. */
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cappwd = cap_service_open(capcas, "system.pwd");
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if (cappwd == NULL)
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err(1, "Unable to open system.pwd service");
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/* Close Casper capability, we don't need it anymore. */
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cap_close(capcas);
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/* Limit service to one single function. */
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if (cap_pwd_limit_cmds(cappwd, cmds, nitems(cmds)))
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err(1, "Unable to limit access to system.pwd service");
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/* Limit service to one field as we only need name of the user. */
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if (cap_pwd_limit_fields(cappwd, fields, nitems(fields)))
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err(1, "Unable to limit access to system.pwd service");
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/* Limit service to one uid. */
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if (cap_pwd_limit_users(cappwd, NULL, 0, uid, nitems(uid)))
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err(1, "Unable to limit access to system.pwd service");
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passwd = cap_getpwuid(cappwd, uid[0]);
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if (passwd == NULL)
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err(1, "Unable to get name of user");
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printf("UID %d is associated with name %s.\\n", uid[0], passwd->pw_name);
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cap_close(cappwd);
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.Ed
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.Sh SEE ALSO
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.Xr cap_enter 2 ,
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.Xr endpwent 3 ,
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.Xr err 3 ,
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.Xr getpwent 3 ,
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.Xr getpwent_r 3 ,
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.Xr getpwnam 3 ,
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.Xr getpwnam_r 3 ,
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.Xr getpwuid 3 ,
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.Xr getpwuid_r 3 ,
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.Xr setpassent 3 ,
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.Xr setpwent 3 ,
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.Xr capsicum 4,
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.Xr nv 9
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.Sh AUTHORS
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The
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.Nm cap_pwd
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service was implemented by
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.An Pawel Jakub Dawidek Aq Mt pawel@dawidek.net
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under sponsorship from the FreeBSD Foundation.
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.Pp
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This manual page was written by
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.An Mariusz Zaborski Aq Mt oshogbo@FreeBSD.org .
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