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- /*
- ** kernel/irix4.c Kernel access functions to retrieve user number
- **
- ** This program is in the public domain and may be used freely by anyone
- ** who wants to.
- **
- ** Last update: 17 March 1993
- **
- ** Please send bug fixes/bug reports to: Peter Eriksson <pen@lysator.liu.se>
- **
- ** Last update: 28 June 1993
- **
- ** Modified by Christopher Kranz, Princeton University to work with suid
- ** root programs. The method for which one descends through the kernel
- ** process structures was borrowed from lsof 2.10 written by Victor A. Abell,
- ** Purdue Research Foundation.
- */
-
- #include <stdio.h>
- #include <errno.h>
- #include <ctype.h>
- #include <nlist.h>
- #include <pwd.h>
- #include <signal.h>
- #include <syslog.h>
-
- #include "kvm.h"
-
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <sys/param.h>
- #include <sys/ioctl.h>
- #include <sys/socket.h>
-
- #include <sys/socketvar.h>
-
- #include <sys/proc.h>
- #include <sys/syssgi.h>
-
- #define _KERNEL
-
- #include <sys/file.h>
-
- #include <sys/inode.h>
-
- #include <fcntl.h>
-
- #include <sys/user.h>
- #include <sys/wait.h>
-
- #undef _KERNEL
-
- #include <net/if.h>
- #include <net/route.h>
- #include <netinet/in.h>
-
- #include <netinet/in_pcb.h>
-
- #include <netinet/tcp.h>
- #include <netinet/ip_var.h>
- #include <netinet/tcp_timer.h>
- #include <netinet/tcp_var.h>
-
- #include <arpa/inet.h>
-
- #include "identd.h"
- #include "error.h"
-
-
- extern void *calloc();
- extern void *malloc();
-
-
- struct nlist nl[] =
- {
- #define N_FILE 0
- #define N_V 1
- #define N_TCB 2
- #define N_PROC 3
-
- { "file" },
- { "v" },
- { "tcb" },
- { "proc" },
- { "" }
- };
-
- static kvm_t *kd;
-
- static struct file *xfile;
- static int nfile;
-
- static struct var v;
-
- static struct inpcb tcb;
-
-
-
- int k_open()
- {
- /*
- ** Open the kernel memory device
- */
- if (!(kd = kvm_open(path_unix, path_kmem, NULL, O_RDONLY, NULL)))
- ERROR("main: kvm_open");
-
- /*
- ** Extract offsets to the needed variables in the kernel
- */
- if (kvm_nlist(kd, nl) != 0)
- ERROR("main: kvm_nlist");
-
- return 0;
- }
-
-
- /*
- ** Get a piece of kernel memory with error handling.
- ** Returns 1 if call succeeded, else 0 (zero).
- */
- static int getbuf(addr, buf, len, what)
- long addr;
- char *buf;
- int len;
- char *what;
- {
-
- if (kvm_read(kd, addr, buf, len) < 0)
- {
- if (syslog_flag)
- syslog(LOG_ERR, "getbuf: kvm_read(%08x, %d) - %s : %m",
- addr, len, what);
-
- return 0;
- }
-
- return 1;
- }
-
-
- /*
- ** Traverse the inpcb list until a match is found.
- ** Returns NULL if no match.
- */
- static struct socket *
- getlist(pcbp, faddr, fport, laddr, lport)
- struct inpcb *pcbp;
- struct in_addr *faddr;
- int fport;
- struct in_addr *laddr;
- int lport;
- {
- struct inpcb *head;
-
- if (!pcbp)
- return NULL;
-
- head = pcbp->inp_prev;
- do
- {
- if ( pcbp->inp_faddr.s_addr == faddr->s_addr &&
- pcbp->inp_laddr.s_addr == laddr->s_addr &&
- pcbp->inp_fport == fport &&
- pcbp->inp_lport == lport )
- return pcbp->inp_socket;
-
- } while (pcbp->inp_next != head &&
- getbuf((long) pcbp->inp_next,
- pcbp,
- sizeof(struct inpcb),
- "tcblist"));
-
- return NULL;
- }
-
-
-
- /*
- ** Return the user number for the connection owner
- */
- int k_getuid(faddr, fport, laddr, lport, uid)
- struct in_addr *faddr;
- int fport;
- struct in_addr *laddr;
- int lport;
- int *uid;
- {
- long addr;
- struct socket *sockp;
- int i;
- struct inode inode;
- long paddr;
- struct proc *pp;
- struct proc ps;
- long pa;
- int px;
- int nofiles;
- struct user *up;
- char *uu;
- size_t uul;
- struct file **fp;
- struct file f;
-
-
- /* -------------------- FILE DESCRIPTOR TABLE -------------------- */
- if (!getbuf(nl[N_V].n_value, &v, sizeof(v), "v"))
- return -1;
-
- nfile = v.v_file;
- addr = nl[N_FILE].n_value;
-
- xfile = (struct file *) calloc(nfile, sizeof(struct file));
- if (!xfile)
- ERROR2("k_getuid: calloc(%d,%d)", nfile, sizeof(struct file));
-
- if (!getbuf(addr, xfile, sizeof(struct file)*nfile, "file[]"))
- return -1;
-
- /* -------------------- TCP PCB LIST -------------------- */
- if (!getbuf(nl[N_TCB].n_value, &tcb, sizeof(tcb), "tcb"))
- return -1;
-
- tcb.inp_prev = (struct inpcb *) nl[N_TCB].n_value;
- sockp = getlist(&tcb, faddr, fport, laddr, lport);
-
- if (!sockp)
- return -1;
-
- /* -------------------- SCAN PROCESS TABLE ------------------- */
- if ( (paddr = nl[N_PROC].n_value) == NULL ) {
- if (debug_flag && syslog_flag)
- syslog(LOG_DEBUG, "k_getuid: paddr == NULL");
- return -1;
- }
-
- paddr &= 0x7fffffff;
-
- uul = (size_t) (sizeof(struct user)
- + (v.v_nofiles * sizeof(struct file *)));
-
- if ( (uu=(char *)malloc(uul)) == (char *)NULL )
- return -1;
-
- fp = (struct file **)(uu + sizeof(struct user));
- up = (struct user *)uu;
-
- for (pp=&ps, px=0 ; px < v.v_proc ; px++) {
- pa = paddr + (long)(px * sizeof(struct proc));
-
- if ( !getbuf(pa, (char *)&ps, sizeof(ps), "proc") )
- continue;
-
- if ( pp->p_stat == 0 || pp->p_stat == SZOMB )
- continue;
-
- /* ------------------- GET U_AREA FOR PROCESS ----------------- */
- if ((i=syssgi(SGI_RDUBLK, pp->p_pid, uu, uul)) < sizeof(struct user))
- continue;
-
- /* ------------------- SCAN FILE TABLE ------------------------ */
- if (i <= sizeof(struct user)
- || ((long)up->u_ofile - UADDR) != sizeof(struct user))
- nofiles = 0;
- else
- nofiles = (i - sizeof(struct user)) / sizeof(struct file *);
-
- for (i = 0 ; i < nofiles ; i++) {
- if (fp[i] == NULL)
- break;
-
- if (!getbuf(fp[i], &f, sizeof(f), "file"))
- return -1;
-
- if ( f.f_count == 0 )
- continue;
-
- if (!getbuf(f.f_inode, &inode, sizeof(inode), "inode"))
- return -1;
-
- if ((inode.i_ftype & IFMT) == IFCHR && soc_fsptr(&inode) == sockp) {
- *uid = up->u_ruid;
- return 0;
- }
- } /* scan file table */
- } /* scan process table */
- return -1;
- }
-