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https://github.com/isc-projects/bind9.git
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82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
/*
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* This file contains the OS-independent functionality of the API.
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*/
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#include <isc/fsaccess.h>
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#include <isc/result.h>
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#include <isc/util.h>
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/*
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* Shorthand. Maybe ISC__FSACCESS_PERMISSIONBITS should not even be in
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* <isc/fsaccess.h>. Could check consistency with sizeof(isc_fsaccess_t)
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* and the number of bits in each function.
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*/
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#define STEP (ISC__FSACCESS_PERMISSIONBITS)
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#define GROUP (STEP)
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#define OTHER (STEP * 2)
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void
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isc_fsaccess_add(int trustee, int permission, isc_fsaccess_t *access) {
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REQUIRE(trustee <= 0x7);
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REQUIRE(permission <= 0xFF);
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if ((trustee & ISC_FSACCESS_OWNER) != 0)
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*access |= permission;
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if ((trustee & ISC_FSACCESS_GROUP) != 0)
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*access |= (permission << GROUP);
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if ((trustee & ISC_FSACCESS_OTHER) != 0)
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*access |= (permission << OTHER);
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}
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void
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isc_fsaccess_remove(int trustee, int permission, isc_fsaccess_t *access) {
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REQUIRE(trustee <= 0x7);
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REQUIRE(permission <= 0xFF);
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if ((trustee & ISC_FSACCESS_OWNER) != 0)
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*access &= ~permission;
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if ((trustee & ISC_FSACCESS_GROUP) != 0)
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*access &= ~(permission << GROUP);
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if ((trustee & ISC_FSACCESS_OTHER) != 0)
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*access &= ~(permission << OTHER);
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}
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static isc_result_t
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check_bad_bits(isc_fsaccess_t access, isc_boolean_t is_dir) {
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isc_fsaccess_t bits;
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/*
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* Check for disallowed user bits.
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*/
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if (is_dir)
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bits = ISC_FSACCESS_READ |
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ISC_FSACCESS_WRITE |
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ISC_FSACCESS_EXECUTE;
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else
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bits = ISC_FSACCESS_CREATECHILD |
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ISC_FSACCESS_ACCESSCHILD |
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ISC_FSACCESS_DELETECHILD |
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ISC_FSACCESS_LISTDIRECTORY;
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/*
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* Set group bad bits.
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*/
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bits |= bits << STEP;
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/*
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* Set other bad bits.
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*/
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bits |= bits << STEP;
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if ((access & bits) != 0) {
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if (is_dir)
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return (ISC_R_NOTFILE);
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else
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return (ISC_R_NOTDIRECTORY);
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}
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return (ISC_R_SUCCESS);
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}
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