/** Structure of an embedded-signature SuperBlob*/typedefstruct __BlobIndex {uint32_t type; /* type of entry */uint32_t offset; /* offset of entry */} CS_BlobIndex__attribute__ ((aligned(1)));typedefstruct __SC_SuperBlob {uint32_t magic; /* magic number */uint32_t length; /* total length of SuperBlob */uint32_t count; /* number of index entries following */CS_BlobIndex index[]; /* (count) entries *//* followed by Blobs in no particular order as indicated by offsets in index */} CS_SuperBlob__attribute__ ((aligned(1)));#defineKERNEL_HAVE_CS_GENERICBLOB1typedefstruct __SC_GenericBlob {uint32_t magic; /* magic number */uint32_t length; /* total length of blob */char data[];} CS_GenericBlob__attribute__ ((aligned(1)));
typedefstruct __CodeDirectory {uint32_t magic; /* magic number (CSMAGIC_CODEDIRECTORY) */uint32_t length; /* total length of CodeDirectory blob */uint32_t version; /* compatibility version */uint32_t flags; /* setup and mode flags */uint32_t hashOffset; /* offset of hash slot element at index zero */uint32_t identOffset; /* offset of identifier string */uint32_t nSpecialSlots; /* number of special hash slots */uint32_t nCodeSlots; /* number of ordinary (code) hash slots */uint32_t codeLimit; /* limit to main image signature range */uint8_t hashSize; /* size of each hash in bytes */uint8_t hashType; /* type of hash (cdHashType* constants) */uint8_t platform; /* platform identifier; zero if not platform binary */uint8_t pageSize; /* log2(page size in bytes); 0 => infinite */uint32_t spare2; /* unused (must be zero) */char end_earliest[0];/* Version 0x20100 */uint32_t scatterOffset; /* offset of optional scatter vector */char end_withScatter[0];/* Version 0x20200 */uint32_t teamOffset; /* offset of optional team identifier */char end_withTeam[0];/* Version 0x20300 */uint32_t spare3; /* unused (must be zero) */uint64_t codeLimit64; /* limit to main image signature range, 64 bits */char end_withCodeLimit64[0];/* Version 0x20400 */uint64_t execSegBase; /* offset of executable segment */uint64_t execSegLimit; /* limit of executable segment */uint64_t execSegFlags; /* executable segment flags */char end_withExecSeg[0];/* Version 0x20500 */uint32_t runtime;uint32_t preEncryptOffset;char end_withPreEncryptOffset[0];/* Version 0x20600 */uint8_t linkageHashType;uint8_t linkageApplicationType;uint16_t linkageApplicationSubType;uint32_t linkageOffset;uint32_t linkageSize;char end_withLinkage[0];/* followed by dynamic content as located by offset fields above */} CS_CodeDirectory__attribute__ ((aligned(1)));
# Get all hashes of /bin/pscodesign-d-vvvvvv/bin/ps[...]CandidateCDHashsha256=c46e56e9490d93fe35a76199bdb367b3463c91dcCandidateCDHashFullsha256=c46e56e9490d93fe35a76199bdb367b3463c91dcdb3c46403ab8ba1c2d13fd86Hashchoices=sha256CMSDigest=c46e56e9490d93fe35a76199bdb367b3463c91dcdb3c46403ab8ba1c2d13fd86CMSDigestType=2ExecutableSegmentbase=0ExecutableSegmentlimit=32768ExecutableSegmentflags=0x1Pagesize=4096-7=a542b4dcbc134fbd950c230ed9ddb99a343262a2df8e0c847caee2b6d3b41cc8-6=0000000000000000000000000000000000000000000000000000000000000000-5=2bb2de519f43b8e116c7eeea8adc6811a276fb134c55c9c2e9dcbd3047f80c7d-4=0000000000000000000000000000000000000000000000000000000000000000-3=0000000000000000000000000000000000000000000000000000000000000000-2=4ca453dc8908dc7f6e637d6159c8761124ae56d080a4a550ad050c27ead273b3-1=00000000000000000000000000000000000000000000000000000000000000000=a5e6478f89812c0c09f123524cad560a9bf758d16014b586089ddc93f004e39c1=ad7facb2586fc6e966c004d7d1d16b024f5805ff7cb47c7a85dabd8b48892ca72=93d476eeace15a5ad14c0fb56169fd080a04b99582b4c7a01e1afcbc58688f[...]# Calculate the hasehs of each page manuallyBINARY=/bin/psSIZE=`stat-f "%Z" $BINARY`PAGESIZE=4096# From the previous outputPAGES=`expr $SIZE / $PAGESIZE`for i in`seq0 $PAGES`; doddif=$BINARY of=/tmp/`basename $BINARY`.page.$ibs=$PAGESIZE skip=$i count=1doneopensslsha256/tmp/*.page.*
/* code signing attributes of a process */#defineCS_VALID0x00000001 /* dynamically valid */#defineCS_ADHOC0x00000002 /* ad hoc signed */#defineCS_GET_TASK_ALLOW0x00000004 /* has get-task-allow entitlement */#defineCS_INSTALLER0x00000008 /* has installer entitlement */#defineCS_FORCED_LV0x00000010 /* Library Validation required by Hardened System Policy */#defineCS_INVALID_ALLOWED0x00000020 /* (macOS Only) Page invalidation allowed by task port policy */#defineCS_HARD0x00000100 /* don't load invalid pages */#defineCS_KILL0x00000200 /* kill process if it becomes invalid */#defineCS_CHECK_EXPIRATION0x00000400 /* force expiration checking */#defineCS_RESTRICT0x00000800 /* tell dyld to treat restricted */#defineCS_ENFORCEMENT0x00001000 /* require enforcement */#defineCS_REQUIRE_LV0x00002000 /* require library validation */#defineCS_ENTITLEMENTS_VALIDATED0x00004000 /* code signature permits restricted entitlements */#defineCS_NVRAM_UNRESTRICTED0x00008000 /* has com.apple.rootless.restricted-nvram-variables.heritable entitlement */#defineCS_RUNTIME0x00010000 /* Apply hardened runtime policies */#defineCS_LINKER_SIGNED0x00020000 /* Automatically signed by the linker */#defineCS_ALLOWED_MACHO (CS_ADHOC | CS_HARD | CS_KILL | CS_CHECK_EXPIRATION | \CS_RESTRICT | CS_ENFORCEMENT | CS_REQUIRE_LV | CS_RUNTIME | CS_LINKER_SIGNED)#defineCS_EXEC_SET_HARD0x00100000 /* set CS_HARD on any exec'ed process */#defineCS_EXEC_SET_KILL0x00200000 /* set CS_KILL on any exec'ed process */#defineCS_EXEC_SET_ENFORCEMENT0x00400000 /* set CS_ENFORCEMENT on any exec'ed process */#defineCS_EXEC_INHERIT_SIP0x00800000 /* set CS_INSTALLER on any exec'ed process */#defineCS_KILLED0x01000000 /* was killed by kernel for invalidity */#defineCS_NO_UNTRUSTED_HELPERS0x02000000 /* kernel did not load a non-platform-binary dyld or Rosetta runtime */#defineCS_DYLD_PLATFORM CS_NO_UNTRUSTED_HELPERS /* old name */#defineCS_PLATFORM_BINARY0x04000000 /* this is a platform binary */#defineCS_PLATFORM_PATH0x08000000 /* platform binary by the fact of path (osx only) */#defineCS_DEBUGGED0x10000000 /* process is currently or has previously been debugged and allowed to run with invalid pages */#defineCS_SIGNED0x20000000 /* process has a signature (may have gone invalid) */#defineCS_DEV_CODE0x40000000 /* code is dev signed, cannot be loaded into prod signed code (will go away with rdar://problem/28322552) */#defineCS_DATAVAULT_CONTROLLER0x80000000 /* has Data Vault controller entitlement */#defineCS_ENTITLEMENT_FLAGS (CS_GET_TASK_ALLOW | CS_INSTALLER | CS_DATAVAULT_CONTROLLER | CS_NVRAM_UNRESTRICTED)
Note that the function exec_mach_imgact は、実行を開始する際に CS_EXEC_* フラグを動的に追加することもできます。
# Generate compiled requirementscsreq-b/tmp/output.csreq-r='identifier "org.whispersystems.signal-desktop" and anchor apple generic and certificate 1[field.1.2.840.113635.100.6.2.6] /* exists */ and certificate leaf[field.1.2.840.113635.100.6.1.13] /* exists */ and certificate leaf[subject.OU] = U68MSDN6DR'# Get the compiled bytesod-Ax-tx1/tmp/output.csreq0000000fade0c00000000b000000001000000060000010000000060000000600000006000000020000020000000216f72672e7768697370657273[...]
struct cs_blob {struct cs_blob *csb_next;vnode_t csb_vnode;void*csb_ro_addr;__xnu_struct_group(cs_cpu_info, csb_cpu_info, {cpu_type_t csb_cpu_type;cpu_subtype_t csb_cpu_subtype;});__xnu_struct_group(cs_signer_info, csb_signer_info, {unsignedint csb_flags;unsignedint csb_signer_type;});off_t csb_base_offset; /* Offset of Mach-O binary in fat binary */off_t csb_start_offset; /* Blob coverage area start, from csb_base_offset */off_t csb_end_offset; /* Blob coverage area end, from csb_base_offset */vm_size_t csb_mem_size;vm_offset_t csb_mem_offset;void*csb_mem_kaddr;unsignedchar csb_cdhash[CS_CDHASH_LEN];conststruct cs_hash *csb_hashtype;#ifCONFIG_SUPPLEMENTAL_SIGNATURESunsignedchar csb_linkage[CS_CDHASH_LEN];conststruct cs_hash *csb_linkage_hashtype;#endifint csb_hash_pageshift;int csb_hash_firstlevel_pageshift; /* First hash this many bytes, then hash the hashes together */const CS_CodeDirectory *csb_cd;constchar*csb_teamid;#ifCONFIG_SUPPLEMENTAL_SIGNATURESchar*csb_supplement_teamid;#endifconst CS_GenericBlob *csb_entitlements_blob; /* raw blob, subrange of csb_mem_kaddr */const CS_GenericBlob *csb_der_entitlements_blob; /* raw blob, subrange of csb_mem_kaddr *//** OSEntitlements pointer setup by AMFI. This is PAC signed in addition to the* cs_blob being within RO-memory to prevent modifications on the temporary stack* variable used to setup the blob.*/void*XNU_PTRAUTH_SIGNED_PTR("cs_blob.csb_entitlements") csb_entitlements;unsignedint csb_reconstituted; /* signature has potentially been modified after validation */__xnu_struct_group(cs_blob_platform_flags, csb_platform_flags, {/* The following two will be replaced by the csb_signer_type. */unsignedint csb_platform_binary:1;unsignedint csb_platform_path:1;});/* Validation category used for TLE */unsignedint csb_validation_category;#ifCODE_SIGNING_MONITORvoid*XNU_PTRAUTH_SIGNED_PTR("cs_blob.csb_csm_obj") csb_csm_obj;bool csb_csm_managed;#endif};
