2000-12-05 01:15:09 +00:00
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/*
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* Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>.
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*
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* Modification and redistribution in source and binary forms is
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* permitted provided that due credit is given to the author and the
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* OpenBSD project (for instance by leaving this copyright notice
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* intact).
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*/
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#include "includes.h"
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2001-01-22 05:34:40 +00:00
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RCSID("$OpenBSD: ssh-keyscan.c,v 1.11 2001/01/21 19:05:57 markus Exp $");
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2000-12-05 01:15:09 +00:00
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2000-12-28 15:46:20 +00:00
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#if defined(HAVE_SYS_QUEUE_H) && !defined(HAVE_BOGUS_SYS_QUEUE_H)
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2000-12-05 01:15:09 +00:00
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#include <sys/queue.h>
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2000-12-06 22:25:40 +00:00
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#else
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#include "bsd-queue.h"
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#endif
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2000-12-05 01:15:09 +00:00
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#include <errno.h>
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#include <openssl/bn.h>
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#include "xmalloc.h"
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#include "ssh.h"
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2001-01-22 05:34:40 +00:00
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#include "ssh1.h"
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2000-12-05 01:15:09 +00:00
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#include "key.h"
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#include "buffer.h"
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#include "bufaux.h"
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2001-01-22 05:34:40 +00:00
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#include "log.h"
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2000-12-05 01:15:09 +00:00
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static int argno = 1; /* Number of argument currently being parsed */
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int family = AF_UNSPEC; /* IPv4, IPv6 or both */
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#define MAXMAXFD 256
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/* The number of seconds after which to give up on a TCP connection */
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int timeout = 5;
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int maxfd;
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#define maxcon (maxfd - 10)
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2000-12-13 17:45:15 +00:00
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#ifdef HAVE___PROGNAME
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extern char *__progname;
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#else
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char *__progname;
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#endif
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2000-12-05 01:15:09 +00:00
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fd_set read_wait;
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int ncon;
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/*
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* Keep a connection structure for each file descriptor. The state
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* associated with file descriptor n is held in fdcon[n].
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*/
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typedef struct Connection {
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2000-12-22 01:43:59 +00:00
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u_char c_status; /* State of connection on this file desc. */
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2000-12-05 01:15:09 +00:00
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#define CS_UNUSED 0 /* File descriptor unused */
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#define CS_CON 1 /* Waiting to connect/read greeting */
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#define CS_SIZE 2 /* Waiting to read initial packet size */
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#define CS_KEYS 3 /* Waiting to read public key packet */
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int c_fd; /* Quick lookup: c->c_fd == c - fdcon */
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int c_plen; /* Packet length field for ssh packet */
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int c_len; /* Total bytes which must be read. */
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int c_off; /* Length of data read so far. */
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char *c_namebase; /* Address to free for c_name and c_namelist */
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char *c_name; /* Hostname of connection for errors */
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char *c_namelist; /* Pointer to other possible addresses */
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char *c_output_name; /* Hostname of connection for output */
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char *c_data; /* Data read from this fd */
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struct timeval c_tv; /* Time at which connection gets aborted */
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TAILQ_ENTRY(Connection) c_link; /* List of connections in timeout order. */
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} con;
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TAILQ_HEAD(conlist, Connection) tq; /* Timeout Queue */
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con *fdcon;
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/*
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* This is just a wrapper around fgets() to make it usable.
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*/
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/* Stress-test. Increase this later. */
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#define LINEBUF_SIZE 16
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typedef struct {
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char *buf;
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2000-12-22 01:43:59 +00:00
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u_int size;
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2000-12-05 01:15:09 +00:00
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int lineno;
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const char *filename;
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FILE *stream;
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void (*errfun) (const char *,...);
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} Linebuf;
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static inline Linebuf *
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Linebuf_alloc(const char *filename, void (*errfun) (const char *,...))
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{
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Linebuf *lb;
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if (!(lb = malloc(sizeof(*lb)))) {
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if (errfun)
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(*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
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return (NULL);
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}
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if (filename) {
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lb->filename = filename;
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if (!(lb->stream = fopen(filename, "r"))) {
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2001-01-18 02:04:35 +00:00
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xfree(lb);
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2000-12-05 01:15:09 +00:00
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if (errfun)
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(*errfun) ("%s: %s\n", filename, strerror(errno));
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return (NULL);
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}
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} else {
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lb->filename = "(stdin)";
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lb->stream = stdin;
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}
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if (!(lb->buf = malloc(lb->size = LINEBUF_SIZE))) {
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if (errfun)
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(*errfun) ("linebuf (%s): malloc failed\n", lb->filename);
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2001-01-18 02:04:35 +00:00
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xfree(lb);
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2000-12-05 01:15:09 +00:00
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return (NULL);
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}
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lb->errfun = errfun;
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lb->lineno = 0;
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return (lb);
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}
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static inline void
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Linebuf_free(Linebuf * lb)
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{
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fclose(lb->stream);
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2001-01-18 02:04:35 +00:00
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xfree(lb->buf);
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xfree(lb);
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2000-12-05 01:15:09 +00:00
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}
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static inline void
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Linebuf_restart(Linebuf * lb)
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{
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clearerr(lb->stream);
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rewind(lb->stream);
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lb->lineno = 0;
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}
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static inline int
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Linebuf_lineno(Linebuf * lb)
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{
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return (lb->lineno);
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}
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static inline char *
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getline(Linebuf * lb)
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{
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int n = 0;
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lb->lineno++;
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for (;;) {
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/* Read a line */
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if (!fgets(&lb->buf[n], lb->size - n, lb->stream)) {
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if (ferror(lb->stream) && lb->errfun)
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(*lb->errfun) ("%s: %s\n", lb->filename, strerror(errno));
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return (NULL);
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}
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n = strlen(lb->buf);
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/* Return it or an error if it fits */
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if (n > 0 && lb->buf[n - 1] == '\n') {
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lb->buf[n - 1] = '\0';
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return (lb->buf);
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}
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if (n != lb->size - 1) {
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if (lb->errfun)
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(*lb->errfun) ("%s: skipping incomplete last line\n", lb->filename);
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return (NULL);
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}
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/* Double the buffer if we need more space */
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if (!(lb->buf = realloc(lb->buf, (lb->size *= 2)))) {
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if (lb->errfun)
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(*lb->errfun) ("linebuf (%s): realloc failed\n", lb->filename);
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return (NULL);
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}
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}
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}
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static int
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fdlim_get(int hard)
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{
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2000-12-27 07:06:21 +00:00
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#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
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2000-12-05 01:15:09 +00:00
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struct rlimit rlfd;
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if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
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return (-1);
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if ((hard ? rlfd.rlim_max : rlfd.rlim_cur) == RLIM_INFINITY)
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return 10000;
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else
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return hard ? rlfd.rlim_max : rlfd.rlim_cur;
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2000-12-27 04:57:41 +00:00
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#elif defined (HAVE_SYSCONF)
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return sysconf (_SC_OPEN_MAX);
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#else
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return 10000;
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#endif
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2000-12-05 01:15:09 +00:00
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}
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static int
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fdlim_set(int lim)
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{
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2000-12-27 07:06:21 +00:00
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#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
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2000-12-05 01:15:09 +00:00
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struct rlimit rlfd;
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2000-12-27 04:57:41 +00:00
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#endif
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2000-12-05 01:15:09 +00:00
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if (lim <= 0)
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return (-1);
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2000-12-27 07:06:21 +00:00
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#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_NOFILE)
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2000-12-05 01:15:09 +00:00
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if (getrlimit(RLIMIT_NOFILE, &rlfd) < 0)
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return (-1);
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rlfd.rlim_cur = lim;
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if (setrlimit(RLIMIT_NOFILE, &rlfd) < 0)
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return (-1);
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2000-12-27 04:57:41 +00:00
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#elif defined (HAVE_SETDTABLESIZE)
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setdtablesize (lim);
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#endif
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2000-12-05 01:15:09 +00:00
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return (0);
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}
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/*
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* This is an strsep function that returns a null field for adjacent
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* separators. This is the same as the 4.4BSD strsep, but different from the
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* one in the GNU libc.
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*/
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inline char *
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xstrsep(char **str, const char *delim)
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{
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char *s, *e;
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if (!**str)
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return (NULL);
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s = *str;
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e = s + strcspn(s, delim);
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if (*e != '\0')
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*e++ = '\0';
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*str = e;
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return (s);
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}
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/*
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* Get the next non-null token (like GNU strsep). Strsep() will return a
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* null token for two adjacent separators, so we may have to loop.
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*/
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char *
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strnnsep(char **stringp, char *delim)
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{
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char *tok;
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do {
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tok = xstrsep(stringp, delim);
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} while (tok && *tok == '\0');
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return (tok);
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}
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void
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keyprint(char *host, char *output_name, char *kd, int len)
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{
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static Key *rsa;
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static Buffer msg;
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if (rsa == NULL) {
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buffer_init(&msg);
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rsa = key_new(KEY_RSA1);
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}
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buffer_append(&msg, kd, len);
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buffer_consume(&msg, 8 - (len & 7)); /* padding */
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if (buffer_get_char(&msg) != (int) SSH_SMSG_PUBLIC_KEY) {
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error("%s: invalid packet type", host);
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buffer_clear(&msg);
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return;
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}
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buffer_consume(&msg, 8); /* cookie */
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/* server key */
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(void) buffer_get_int(&msg);
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buffer_get_bignum(&msg, rsa->rsa->e);
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buffer_get_bignum(&msg, rsa->rsa->n);
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/* host key */
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(void) buffer_get_int(&msg);
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buffer_get_bignum(&msg, rsa->rsa->e);
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buffer_get_bignum(&msg, rsa->rsa->n);
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buffer_clear(&msg);
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fprintf(stdout, "%s ", output_name ? output_name : host);
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key_write(rsa, stdout);
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fputs("\n", stdout);
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}
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int
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tcpconnect(char *host)
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{
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struct addrinfo hints, *ai, *aitop;
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char strport[NI_MAXSERV];
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int gaierr, s = -1;
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2001-01-18 02:04:35 +00:00
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snprintf(strport, sizeof strport, "%d", SSH_DEFAULT_PORT);
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2000-12-05 01:15:09 +00:00
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = family;
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hints.ai_socktype = SOCK_STREAM;
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if ((gaierr = getaddrinfo(host, strport, &hints, &aitop)) != 0)
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fatal("getaddrinfo %s: %s", host, gai_strerror(gaierr));
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for (ai = aitop; ai; ai = ai->ai_next) {
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s = socket(ai->ai_family, SOCK_STREAM, 0);
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if (s < 0) {
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error("socket: %s", strerror(errno));
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continue;
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}
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2001-01-09 00:35:42 +00:00
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if (fcntl(s, F_SETFL, O_NONBLOCK) < 0)
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2000-12-05 01:15:09 +00:00
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fatal("F_SETFL: %s", strerror(errno));
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if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0 &&
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errno != EINPROGRESS)
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error("connect (`%s'): %s", host, strerror(errno));
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else
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break;
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close(s);
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s = -1;
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}
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freeaddrinfo(aitop);
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return s;
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}
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int
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conalloc(char *iname, char *oname)
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{
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int s;
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char *namebase, *name, *namelist;
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namebase = namelist = xstrdup(iname);
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do {
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name = xstrsep(&namelist, ",");
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if (!name) {
|
2001-01-18 02:04:35 +00:00
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xfree(namebase);
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2000-12-05 01:15:09 +00:00
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return (-1);
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}
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} while ((s = tcpconnect(name)) < 0);
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if (s >= maxfd)
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2000-12-15 18:39:12 +00:00
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fatal("conalloc: fdno %d too high", s);
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2000-12-05 01:15:09 +00:00
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if (fdcon[s].c_status)
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2000-12-15 18:39:12 +00:00
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fatal("conalloc: attempt to reuse fdno %d", s);
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2000-12-05 01:15:09 +00:00
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fdcon[s].c_fd = s;
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fdcon[s].c_status = CS_CON;
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fdcon[s].c_namebase = namebase;
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fdcon[s].c_name = name;
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fdcon[s].c_namelist = namelist;
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fdcon[s].c_output_name = xstrdup(oname);
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|
|
fdcon[s].c_data = (char *) &fdcon[s].c_plen;
|
|
|
|
fdcon[s].c_len = 4;
|
|
|
|
fdcon[s].c_off = 0;
|
|
|
|
gettimeofday(&fdcon[s].c_tv, NULL);
|
|
|
|
fdcon[s].c_tv.tv_sec += timeout;
|
|
|
|
TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
|
|
|
|
FD_SET(s, &read_wait);
|
|
|
|
ncon++;
|
|
|
|
return (s);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
confree(int s)
|
|
|
|
{
|
|
|
|
close(s);
|
|
|
|
if (s >= maxfd || fdcon[s].c_status == CS_UNUSED)
|
2000-12-15 18:39:12 +00:00
|
|
|
fatal("confree: attempt to free bad fdno %d", s);
|
2001-01-18 02:04:35 +00:00
|
|
|
xfree(fdcon[s].c_namebase);
|
|
|
|
xfree(fdcon[s].c_output_name);
|
2000-12-05 01:15:09 +00:00
|
|
|
if (fdcon[s].c_status == CS_KEYS)
|
2001-01-18 02:04:35 +00:00
|
|
|
xfree(fdcon[s].c_data);
|
2000-12-05 01:15:09 +00:00
|
|
|
fdcon[s].c_status = CS_UNUSED;
|
|
|
|
TAILQ_REMOVE(&tq, &fdcon[s], c_link);
|
|
|
|
FD_CLR(s, &read_wait);
|
|
|
|
ncon--;
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
contouch(int s)
|
|
|
|
{
|
|
|
|
TAILQ_REMOVE(&tq, &fdcon[s], c_link);
|
|
|
|
gettimeofday(&fdcon[s].c_tv, NULL);
|
|
|
|
fdcon[s].c_tv.tv_sec += timeout;
|
|
|
|
TAILQ_INSERT_TAIL(&tq, &fdcon[s], c_link);
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
conrecycle(int s)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
con *c = &fdcon[s];
|
|
|
|
char *iname, *oname;
|
|
|
|
|
|
|
|
iname = xstrdup(c->c_namelist);
|
2001-01-18 02:04:35 +00:00
|
|
|
oname = xstrdup(c->c_output_name);
|
2000-12-05 01:15:09 +00:00
|
|
|
confree(s);
|
|
|
|
ret = conalloc(iname, oname);
|
2001-01-18 02:04:35 +00:00
|
|
|
xfree(iname);
|
|
|
|
xfree(oname);
|
2000-12-05 01:15:09 +00:00
|
|
|
return (ret);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
congreet(int s)
|
|
|
|
{
|
|
|
|
char buf[80];
|
|
|
|
int n;
|
|
|
|
con *c = &fdcon[s];
|
|
|
|
|
|
|
|
n = read(s, buf, sizeof(buf));
|
|
|
|
if (n < 0) {
|
|
|
|
if (errno != ECONNREFUSED)
|
|
|
|
error("read (%s): %s", c->c_name, strerror(errno));
|
|
|
|
conrecycle(s);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (buf[n - 1] != '\n') {
|
|
|
|
error("%s: bad greeting", c->c_name);
|
|
|
|
confree(s);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
buf[n - 1] = '\0';
|
|
|
|
fprintf(stderr, "# %s %s\n", c->c_name, buf);
|
|
|
|
n = snprintf(buf, sizeof buf, "SSH-1.5-OpenSSH-keyscan\r\n");
|
|
|
|
if (write(s, buf, n) != n) {
|
|
|
|
error("write (%s): %s", c->c_name, strerror(errno));
|
|
|
|
confree(s);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
c->c_status = CS_SIZE;
|
|
|
|
contouch(s);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
conread(int s)
|
|
|
|
{
|
|
|
|
int n;
|
|
|
|
con *c = &fdcon[s];
|
|
|
|
|
|
|
|
if (c->c_status == CS_CON) {
|
|
|
|
congreet(s);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
n = read(s, c->c_data + c->c_off, c->c_len - c->c_off);
|
|
|
|
if (n < 0) {
|
|
|
|
error("read (%s): %s", c->c_name, strerror(errno));
|
|
|
|
confree(s);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
c->c_off += n;
|
|
|
|
|
|
|
|
if (c->c_off == c->c_len)
|
|
|
|
switch (c->c_status) {
|
|
|
|
case CS_SIZE:
|
|
|
|
c->c_plen = htonl(c->c_plen);
|
|
|
|
c->c_len = c->c_plen + 8 - (c->c_plen & 7);
|
|
|
|
c->c_off = 0;
|
|
|
|
c->c_data = xmalloc(c->c_len);
|
|
|
|
c->c_status = CS_KEYS;
|
|
|
|
break;
|
|
|
|
case CS_KEYS:
|
|
|
|
keyprint(c->c_name, c->c_output_name, c->c_data, c->c_plen);
|
|
|
|
confree(s);
|
|
|
|
return;
|
|
|
|
break;
|
|
|
|
default:
|
2000-12-15 18:39:12 +00:00
|
|
|
fatal("conread: invalid status %d", c->c_status);
|
2000-12-05 01:15:09 +00:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
contouch(s);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
conloop(void)
|
|
|
|
{
|
|
|
|
fd_set r, e;
|
|
|
|
struct timeval seltime, now;
|
|
|
|
int i;
|
|
|
|
con *c;
|
|
|
|
|
|
|
|
gettimeofday(&now, NULL);
|
|
|
|
c = tq.tqh_first;
|
|
|
|
|
|
|
|
if (c &&
|
|
|
|
(c->c_tv.tv_sec > now.tv_sec ||
|
|
|
|
(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec > now.tv_usec))) {
|
|
|
|
seltime = c->c_tv;
|
|
|
|
seltime.tv_sec -= now.tv_sec;
|
|
|
|
seltime.tv_usec -= now.tv_usec;
|
|
|
|
if ((int) seltime.tv_usec < 0) {
|
|
|
|
seltime.tv_usec += 1000000;
|
|
|
|
seltime.tv_sec--;
|
|
|
|
}
|
|
|
|
} else
|
|
|
|
seltime.tv_sec = seltime.tv_usec = 0;
|
|
|
|
|
|
|
|
r = e = read_wait;
|
|
|
|
select(maxfd, &r, NULL, &e, &seltime);
|
|
|
|
for (i = 0; i < maxfd; i++)
|
|
|
|
if (FD_ISSET(i, &e)) {
|
|
|
|
error("%s: exception!", fdcon[i].c_name);
|
|
|
|
confree(i);
|
|
|
|
} else if (FD_ISSET(i, &r))
|
|
|
|
conread(i);
|
|
|
|
|
|
|
|
c = tq.tqh_first;
|
|
|
|
while (c &&
|
|
|
|
(c->c_tv.tv_sec < now.tv_sec ||
|
|
|
|
(c->c_tv.tv_sec == now.tv_sec && c->c_tv.tv_usec < now.tv_usec))) {
|
|
|
|
int s = c->c_fd;
|
|
|
|
c = c->c_link.tqe_next;
|
|
|
|
conrecycle(s);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
char *
|
|
|
|
nexthost(int argc, char **argv)
|
|
|
|
{
|
|
|
|
static Linebuf *lb;
|
|
|
|
|
|
|
|
for (;;) {
|
|
|
|
if (!lb) {
|
|
|
|
if (argno >= argc)
|
|
|
|
return (NULL);
|
|
|
|
if (argv[argno][0] != '-')
|
|
|
|
return (argv[argno++]);
|
|
|
|
if (!strcmp(argv[argno], "--")) {
|
|
|
|
if (++argno >= argc)
|
|
|
|
return (NULL);
|
|
|
|
return (argv[argno++]);
|
|
|
|
} else if (!strncmp(argv[argno], "-f", 2)) {
|
|
|
|
char *fname;
|
|
|
|
if (argv[argno][2])
|
|
|
|
fname = &argv[argno++][2];
|
|
|
|
else if (++argno >= argc) {
|
|
|
|
error("missing filename for `-f'");
|
|
|
|
return (NULL);
|
|
|
|
} else
|
|
|
|
fname = argv[argno++];
|
|
|
|
if (!strcmp(fname, "-"))
|
|
|
|
fname = NULL;
|
2000-12-06 22:47:55 +00:00
|
|
|
lb = Linebuf_alloc(fname, error);
|
2000-12-05 01:15:09 +00:00
|
|
|
} else
|
|
|
|
error("ignoring invalid/misplaced option `%s'", argv[argno++]);
|
|
|
|
} else {
|
|
|
|
char *line;
|
|
|
|
line = getline(lb);
|
|
|
|
if (line)
|
|
|
|
return (line);
|
|
|
|
Linebuf_free(lb);
|
|
|
|
lb = NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
usage(void)
|
|
|
|
{
|
2000-12-15 18:39:12 +00:00
|
|
|
fatal("usage: %s [-t timeout] { [--] host | -f file } ...", __progname);
|
2000-12-05 01:15:09 +00:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
main(int argc, char **argv)
|
|
|
|
{
|
|
|
|
char *host = NULL;
|
|
|
|
|
2000-12-13 17:45:15 +00:00
|
|
|
__progname = get_progname(argv[0]);
|
2000-12-05 01:15:09 +00:00
|
|
|
TAILQ_INIT(&tq);
|
|
|
|
|
|
|
|
if (argc <= argno)
|
|
|
|
usage();
|
|
|
|
|
|
|
|
if (argv[1][0] == '-' && argv[1][1] == 't') {
|
|
|
|
argno++;
|
|
|
|
if (argv[1][2])
|
|
|
|
timeout = atoi(&argv[1][2]);
|
|
|
|
else {
|
|
|
|
if (argno >= argc)
|
|
|
|
usage();
|
|
|
|
timeout = atoi(argv[argno++]);
|
|
|
|
}
|
|
|
|
if (timeout <= 0)
|
|
|
|
usage();
|
|
|
|
}
|
|
|
|
if (argc <= argno)
|
|
|
|
usage();
|
|
|
|
|
|
|
|
maxfd = fdlim_get(1);
|
|
|
|
if (maxfd < 0)
|
2000-12-15 18:39:12 +00:00
|
|
|
fatal("%s: fdlim_get: bad value", __progname);
|
2000-12-05 01:15:09 +00:00
|
|
|
if (maxfd > MAXMAXFD)
|
|
|
|
maxfd = MAXMAXFD;
|
|
|
|
if (maxcon <= 0)
|
2000-12-15 18:39:12 +00:00
|
|
|
fatal("%s: not enough file descriptors", __progname);
|
2000-12-05 01:15:09 +00:00
|
|
|
if (maxfd > fdlim_get(0))
|
|
|
|
fdlim_set(maxfd);
|
|
|
|
fdcon = xmalloc(maxfd * sizeof(con));
|
|
|
|
|
|
|
|
do {
|
|
|
|
while (ncon < maxcon) {
|
|
|
|
char *name;
|
|
|
|
|
|
|
|
host = nexthost(argc, argv);
|
|
|
|
if (host == NULL)
|
|
|
|
break;
|
|
|
|
name = strnnsep(&host, " \t\n");
|
|
|
|
conalloc(name, *host ? host : name);
|
|
|
|
}
|
|
|
|
conloop();
|
|
|
|
} while (host);
|
|
|
|
while (ncon > 0)
|
|
|
|
conloop();
|
|
|
|
|
|
|
|
return (0);
|
|
|
|
}
|