;^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ; User written system service dispatcher for the ; become routines ; ; Author: Billy Bitsenbites (Bruce Ellis) ; Function: These services will receive a user name and ; account name and cwrite an accounting record, clear ; the accounting data cells, change the user name, account ; name, the UIC, redirect LNM$GROUP to the new group #, ; and add any rights associated with the new UIC. ; Note: This code is a modification of the Digital supplied ; User-written system service dipatcher. In the interest of ; brevity and saving a few trees, several comments were removed ; from the original. The reader is directed to the file ; SYS$EXAMPLES:USSDISP.MAR for a completely documented version ; of the system service dispatcher. ; ;^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ; .LIBRARY "SYS$LIBRARY:LIB.MLB" ; Macro library for system structure ; definitions ; ; Macro Definitions ; ; DEFINE_SERVICE - A macro to make the appropriate entries in several ; different PSECTs required to define an EXEC or KERNEL ; mode service. These include the transfer vector, ; the case table for dispatching, and a table containing ; the number of required arguments. ; ; DEFINE_SERVICE Name,Number_of_Arguments,Mode ; .MACRO DEFINE_SERVICE,NAME,NARG=0,MODE=KERNEL .PSECT $$$TRANSFER_VECTOR,PAGE,NOWRT,EXE,PIC .ALIGN QUAD ; Align entry points for speed and style .TRANSFER NAME ; Define name as universal sym for ent .MASK NAME ; Use entry mask defined in main routine .IF IDN MODE,KERNEL CHMK # ; Change to kernel mode and execute RET ; Return KERNEL_COUNTER=KERNEL_COUNTER+1 ; Advance counter .PSECT KERNEL_NARG,BYTE,NOWRT,EXE,PIC .BYTE NARG ; Define number of required arguments .PSECT USER_KERNEL_DISP1,BYTE,NOWRT,EXE,PIC .SIGNED_WORD 2+NAME-KCASE_BASE ; Make entry in krnl mode CASE ; table .IFF CHME # ; Change to executive mode RET ; Return EXEC_COUNTER=EXEC_COUNTER+1 ; Advance counter .PSECT EXEC_NARG,BYTE,NOWRT,EXE,PIC .BYTE NARG ; Define number of required arguments .PSECT USER_EXEC_DISP1,BYTE,NOWRT,EXE,PIC .SIGNED_WORD 2+NAME-ECASE_BASE ; Make entry in exec mode CASE ; table .ENDC ; .ENDM DEFINE_SERVICE ; ; ; Equated Symbols ; $prvdef ; privilege symbols $pcbdef ; process control block offsets $jibdef ; job information block offsets $lnmdef ; logical name symbols $psldef ; Processor status longword symbols $PHDDEF ; Define process header offsets $PLVDEF ; Define PLV offsets and values $SSDEF ; Define system status codes ; ; Initialize counters for change mode dispatching codes ; KERNEL_COUNTER=0 ; Kernel code counter EXEC_COUNTER=0 ; Exec code counter ; ; Own Storage ; .PSECT KERNEL_NARG,BYTE,NOWRT,EXE,PIC KERNEL_NARG: ; Base of byte table containing the ; number of required arguments. .PSECT EXEC_NARG,BYTE,NOWRT,EXE,PIC EXEC_NARG: ; Base of byte table containing the ; number of required arguments. .PAGE .SBTTL Transfer Vector and Service Definitions ;Note: this a kluge to allow us to be able ;to access the local transfer vector for our ;kernel mode service, as internally we would go directly ;to the routine in exec mode. .PSECT $$$TRANSFER_VECTOR,PAGE,NOWRT,EXE,PIC become_blast_it_vec: DEFINE_SERVICE become_blast_it,4,KERNEL ; Service to write acc record ; and reset user and acct name ; UIC and LNM$GROUP DEFINE_SERVICE become,2,EXEC ; Exec mode shell which gets UIC ; from user name, calls become_blast_it ; and revokes old idents and adds ;idents for the new UIC. ; KCODE_BASE= -1024 ; Base CHMK code value for these services ECODE_BASE= -1024 ; Base CHME code value for these services .PAGE .SBTTL Change Mode Dispatcher Vector Block ; ; ; .PSECT USER_SERVICES,PAGE,VEC,PIC,NOWRT,EXE .LONG PLV$C_TYP_CMOD ; Set type of vec to change mode disp .LONG 0 ; Reserved .LONG KERNEL_DISPATCH-. ; Offset to kernel mode dispatcher .LONG EXEC_DISPATCH-. ; Offset to executive mode dispatcher .LONG 0 ; No user rundown service .LONG 0 ; Reserved. .LONG 0 ; No RMS dispatcher .LONG 0 ; Address check - PIC image .PAGE .SBTTL Kernel Mode Dispatcher ;++ ; Input Parameters: ; ; (SP) - Return address if bad change mode value ; ; R0 - Change mode argument value. ; ; R4 - Current PCB Address. (Therefore R4 must be specified in all ; register save masks for kernel routines.) ; ; AP - Argument pointer existing when the change ; mode instruction was executed. ; ; FP - Address of minimal call frame to exit ; the change mode dispatcher and return to ; the original mode. ;-- .PSECT USER_KERNEL_DISP0,BYTE,NOWRT,EXE,PIC KACCVIO: ; Kernel access violation MOVZWL #SS$_ACCVIO,R0 ; Set access violation status code RET ; and return KINSFARG: ; Kernel insufficient arguments. MOVZWL #SS$_INSFARG,R0 ; Set status code and RET ; return KNOTME: RSB ; RSB to forward request KERNEL_DISPATCH:: ; Entry to dispatcher MOVAB W^-KCODE_BASE(R0),R1 ; Normalize dispatch code value BLSS KNOTME ; Branch if code value too low CMPW R1,#KERNEL_COUNTER ; Check high limit BGEQU KNOTME ; Branch if out of range ; ; The dispatch code has now been verified as being handled by this dispatcher, ; now the argument list will be probed and the required number of arguments ; verified. ; MOVZBL W^KERNEL_NARG[R1],R1 ; Get required argument count MOVAL @#4[R1],R1 ; Compute byte count including arg count IFNORD R1,(AP),KACCVIO ; Branch if arglist not readable CMPB (AP),W^[R0] ; Check for required number BLSSU KINSFARG ; of arguments MOVL FP,SP ; Reset stack for service routine CASEW R0,- ; Case on change mode - ; argument value #KCODE_BASE,- ; Base value # ; Limit value (number of entries) KCASE_BASE: ; Case table base address for ; DEFINE_SERVICE ; ; Case table entries are made in the PSECT USER_KERNEL_DISP1 by ; invocations of the DEFINE_SERVICE macro. The three PSECTS, ; USER_KERNEL_DISP0,1,2 will be abutted in lexical order at link-time. ; .PSECT USER_KERNEL_DISP2,BYTE,NOWRT,EXE,PIC BUG_CHECK IVSSRVRQST,FATAL ; Since the change mode code is valid ; above, we should never get here .PAGE .SBTTL Executive Mode Dispatcher ;++ ; Input Parameters: ; ; (SP) - Return address if bad change mode value ; ; R0 - Change mode argument value. ; ; AP - Argument pointer existing when the change ; mode instruction was executed. ; ; FP - Address of minimal call frame to exit ; the change mode dispatcher and return to ; the original mode. ;-- .PSECT USER_EXEC_DISP0,BYTE,NOWRT,EXE,PIC EACCVIO: ; Exec access violation MOVZWL #SS$_ACCVIO,R0 ; Set access violation status code RET ; and return EINSFARG: ; Exec insufficient arguments. MOVZWL #SS$_INSFARG,R0 ; Set status code and RET ; return ENOTME: RSB ; RSB to forward request EXEC_DISPATCH:: ; Entry to dispatcher MOVAB W^-ECODE_BASE(R0),R1 ; Normalize dispatch code value BLSS ENOTME ; Branch if code value too low CMPW R1,#EXEC_COUNTER ; Check high limit BGEQU ENOTME ; Branch if out of range ; ; The dispatch code has now been verified as being handled by this dispatcher, ; now the argument list will be probed and the required number of arguments ; verified. ; MOVZBL W^EXEC_NARG[R1],R1 ; Get required argument count MOVAL @#4[R1],R1 ; Compute byte count including arg count IFNORD R1,(AP),EACCVIO ; Branch if arglist not readable CMPB (AP),W^[R0] ; Check for required number BLSSU EINSFARG ; of arguments MOVL FP,SP ; Reset stack for service routine CASEW R0,- ; Case on change mode - ; argument value #ECODE_BASE,- ; Base value # ; Limit value (number of entries) ECASE_BASE: ; Case table base address for ; DEFINE_SERVICE ; ; Case table entries are made in the PSECT USER_EXEC_DISP1 by ; invocations of the DEFINE_SERVICE macro. The three PSECTS, ; USER_EXEC_DISP0,1,2 will be abutted in lexical order at link-time. ; .PSECT USER_EXEC_DISP2,BYTE,NOWRT,EXE,PIC BUG_CHECK IVSSRVRQST,FATAL ; Since the change mode code is valid ; above, we should never get here .SBTTL Blast username, acct name, UIC, and LNM$GROUP ;++ ; Functional Description: ; This routine receives the user name, account name, uic ; and resets them. It also resets LNM$GROUP to ; correspond to the new group and returns the old uic. ; ; Input Parameters: ; 4(AP) - Address of descriptor containing user name ; 8(AP) - Address of descriptor containing new account name ; 12(ap) - Address of uic ; 16(ap) - Address to receive old UIC ; R4 - Address of current PCB ; ; Output Parameters: ; 16(AP) - gets old UIC. ; R0 - Completion Status Code ;-- .psect zzzkernel_data,byte,wrt,noexe,noshr grp_fmt: .ascid /!6OW/ group_desc: .long 6 .address group_num group_val: .long 16 .address group_str group_str: .ascii /LNM$GROUP_/ group_num: .blkb 6 proc_table: .ascid /LNM$PROCESS_DIRECTORY/ group: .ascid /LNM$GROUP/ log_items: .word 16,LNM$_STRING .address group_str .long 0,0 .psect user_code,byte,nowrt,exe,pic kr_accvio: movl #ss$_accvio,r0 ;Return access violation ret kr_nopriv: movl #ss$_nooper,r0 ;Return no oper privilege ret .entry become_blast_it,^m ifnpriv OPER,kr_nopriv ;No OPER, no can do movl 4(ap),r8 ;get username descriptor address ifnord #8,(r8),kr_accvio ;if can't touch desc. error out movzwl (r8),r7 ;get size of string (user) movl 4(r8),r8 ;get address of string (user) ifnord r7,(r8),kr_accvio ;if can't touch string error out movl 8(ap),r9 ;get acct name descriptor address ifnord #8,(r9),kr_accvio ;if can't touch desc. error out movzwl (r9),r10 ;get size of string (acct) movl 4(r9),r9 ;get address of string (acct) ifnord r10,(r9),kr_accvio ;if can't touch string error out ifnord #4,@12(ap),kr_accvio ;if can't read UIC error out ifnowrt #4,@16(ap),kr_accvio ;if can't write return UIC error out movl #ss$_normal,g^ctl$gl_finalsts ;set succuss for acct rec. clrl r5 ;not a special kast jsb g^exe$prcpurmsg ;write acct record movl #ss$_normal,g^ctl$gl_finalsts ;set new success status movq g^exe$gq_systime,g^ctl$gq_login ;reset connect time clrl g^ctl$gl_volumes ;clear number of volumes mounted clrl g^ctl$gl_wspeak ;clear peak working set size movl g^ctl$gl_phd,r2 ;get P1 window to phd clrl g^ctl$gl_virtpeak ;clear peak virtual adddress space size clrl phd$l_cputim(r2) ;clear cputime clrl phd$l_pageflts(r2) ;clear count of page faults clrl phd$l_pgfltio(r2) ;clear count of "hard" faults clrl phd$l_biocnt(r2) ;clear count of buffered I/Os clrl phd$l_diocnt(r2) ;clear count of direct I/Os clrl phd$l_imgcnt(r2) ;clear count of images run movq g^exe$gq_systime,g^ctl$gq_istart ;reset imgact time clrl g^ctl$gl_ivolumes ;clear image vloume count clrl g^ctl$gl_iwspeak ;clear image working set peak clrl g^ctl$gl_icputim ;clear image cpu time clrl g^ctl$gl_ifaults ;clear image faults clrl g^ctl$gl_ifaultio ;clear image hard faults clrl g^ctl$gl_ibiocnt ;clear image buffered I/Os clrl g^ctl$gl_idiocnt ;clear image direct I/Os clrl g^ctl$gl_ipagefl ;clear image page file usage ;Format the group number to octal ascii $fao_s ctrstr=grp_fmt,outbuf=group_desc,p1=<> blbs r0,30$ ret ;Reset LNM$GROUP to correspond to new group # 30$: $crelnm_s tabnam=proc_table,- lognam=group,- acmode=#psl$c_super,- itmlst=log_items blbs r0,20$ ret 20$: movl pcb$l_uic(r4),@16(ap) ;Return old UIC movl @12(ap),pcb$l_uic(r4) ;Reset to new UIC movl pcb$l_jib(r4),r6 ;Get the JIB pushr #^m ;Reset the user name movc5 r7,(r8),#^a/ /,#jib$s_username,jib$t_username(r6) movc5 r7,(r8),#^a/ /,#jib$s_username,g^ctl$t_username ;Reset the account name movc5 r10,(r9),#^a/ /,#jib$s_account,jib$t_account(r6) movc5 r10,(r9),#^a/ /,#jib$s_account,g^ctl$t_account popr #^m movl #ss$_normal,r0 ;success ret .PAGE .SBTTL become another user ;++ ; Functional Description: ; This routine allows the calling program to operate ; under the general environment of the passed user ; name ; ; Input Parameters: ; 04(AP) - address of new user name ; 08(AP) - address of new account name ; ; Output Parameters: ; R0 - Completion Status code ; resets username, account name, UIC, LNM$GROUP, identifiers ; writes accounting record under old username. ;-- .psect zzzexec_data,byte,wrt,noexe,noshr old_uic: .blkl 1 ;storage for old uic .long 0 ;set valid identifier format uic: .blkl 1 ;storage for new UIC .long 0 ;set valid identifier format ident: .blkl 1 ctx: .long 0 ;context for Rightslist DataBase access .psect user_code,byte,nowrt,exe,pic er_accvio: movl #ss$_accvio,r0 ;return access violation ret .entry become,^m movl 4(ap),r8 ;get username descriptor address ifnord #8,(r8),er_accvio ;if can't touch desc. error out movzwl (r8),r7 ;get size of string (user) movl 4(r8),r8 ;get address of string (user) ifnord r7,(r8),er_accvio ;if can't touch string error out $asctoid_s name=@4(ap),- ;convert the username to UIC id=uic blbs r0,10$ ret 10$: pushal old_uic ;pass return address for old uic pushal uic ;pass uic pushl 8(ap) ;pass account name pushl 4(ap) ;pass user name calls #4,g^become_blast_it_vec ;blast the stuff blbs r0,20$ ret 20$: movl #ss$_normal,r0 ret .END ;************************************************************* ; Program: become_test ; Author: Billy Bitsenbites (Bruce Ellis) ; Function: Sample call to the become system service ; ;************************************************************* .library /sys$library:lib.mlb/ .macro check ?l blbs r0,l $exit_s r0 l: .endm check $jibdef in_user: .long jib$s_username .address user user: .blkb jib$s_username in_acct: .long jib$s_account .address account account: .blkb jib$s_account user_pmt: .ascid /New username>/ acct_pmt: .ascid /New account>/ .entry change_acct,^m<> pushal in_user ;Read in a new user name pushal user_pmt pushal in_user calls #3,g^lib$get_input check pushal in_acct ;Read in a new user name pushal acct_pmt pushal in_acct calls #3,g^lib$get_input check pushal in_acct ;become that user pushal in_user calls #2,g^become ret .end change_acct