diff options
Diffstat (limited to 'lib/libc/posix1e/acl_branding.c')
| -rw-r--r-- | lib/libc/posix1e/acl_branding.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/lib/libc/posix1e/acl_branding.c b/lib/libc/posix1e/acl_branding.c new file mode 100644 index 0000000..84b0063 --- /dev/null +++ b/lib/libc/posix1e/acl_branding.c @@ -0,0 +1,169 @@ +/*- + * Copyright (c) 2008, 2009 Edward Tomasz Napierała <trasz@FreeBSD.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <assert.h> +#include <errno.h> +#include <sys/acl.h> + +#include "acl_support.h" + +/* + * An ugly detail of the implementation - fortunately not visible + * to the API users - is the "branding": libc needs to keep track + * of what "brand" ACL is: NFSv4, POSIX.1e or unknown. It happens + * automatically - for example, during acl_get_file(3) ACL gets + * branded according to the "type" argument; during acl_set_permset + * ACL, if its brand is unknown it gets branded as NFSv4 if any of the + * NFSv4 permissions that are not valid for POSIX.1e ACL are set etc. + * Branding information is used for printing out the ACL (acl_to_text(3)), + * veryfying acl_set_whatever arguments (checking against setting + * bits that are valid only for NFSv4 in ACL branded as POSIX.1e) etc. + */ + +static acl_t +entry2acl(acl_entry_t entry) +{ + acl_t aclp; + + aclp = (acl_t)(((long)entry >> _ACL_T_ALIGNMENT_BITS) << _ACL_T_ALIGNMENT_BITS); + + return (aclp); +} + +/* + * Return brand of an ACL. + */ +int +_acl_brand(const acl_t acl) +{ + + return (acl->ats_brand); +} + +int +_entry_brand(const acl_entry_t entry) +{ + + return (_acl_brand(entry2acl(entry))); +} + +/* + * Return 1, iff branding ACL as "brand" is ok. + */ +int +_acl_brand_may_be(const acl_t acl, int brand) +{ + + if (_acl_brand(acl) == ACL_BRAND_UNKNOWN) + return (1); + + if (_acl_brand(acl) == brand) + return (1); + + return (0); +} + +int +_entry_brand_may_be(const acl_entry_t entry, int brand) +{ + + return (_acl_brand_may_be(entry2acl(entry), brand)); +} + +/* + * Brand ACL as "brand". + */ +void +_acl_brand_as(acl_t acl, int brand) +{ + + assert(_acl_brand_may_be(acl, brand)); + + acl->ats_brand = brand; +} + +void +_entry_brand_as(const acl_entry_t entry, int brand) +{ + + _acl_brand_as(entry2acl(entry), brand); +} + +int +_acl_type_not_valid_for_acl(const acl_t acl, acl_type_t type) +{ + + switch (_acl_brand(acl)) { + case ACL_BRAND_NFS4: + if (type == ACL_TYPE_NFS4) + return (0); + break; + + case ACL_BRAND_POSIX: + if (type == ACL_TYPE_ACCESS || type == ACL_TYPE_DEFAULT) + return (0); + break; + + case ACL_BRAND_UNKNOWN: + return (0); + } + + return (-1); +} + +void +_acl_brand_from_type(acl_t acl, acl_type_t type) +{ + + switch (type) { + case ACL_TYPE_NFS4: + _acl_brand_as(acl, ACL_BRAND_NFS4); + break; + case ACL_TYPE_ACCESS: + case ACL_TYPE_DEFAULT: + _acl_brand_as(acl, ACL_BRAND_POSIX); + break; + default: + /* XXX: What to do here? */ + break; + } +} + +int +acl_get_brand_np(acl_t acl, int *brand_p) +{ + + if (acl == NULL || brand_p == NULL) { + errno = EINVAL; + return (-1); + } + *brand_p = _acl_brand(acl); + + return (0); +} |
