diff options
| -rw-r--r-- | addr.c | 73 | ||||
| -rw-r--r-- | addr.h | 4 | ||||
| -rw-r--r-- | ssh-keyscan.1 | 24 | ||||
| -rw-r--r-- | ssh-keyscan.c | 43 |
4 files changed, 136 insertions, 8 deletions
@@ -1,4 +1,4 @@ -/* $OpenBSD: addr.c,v 1.5 2022/04/29 04:55:07 djm Exp $ */ +/* $OpenBSD: addr.c,v 1.6 2022/10/28 02:29:34 djm Exp $ */ /* * Copyright (c) 2004-2008 Damien Miller <djm@mindrot.org> @@ -228,6 +228,28 @@ addr_and(struct xaddr *dst, const struct xaddr *a, const struct xaddr *b) } int +addr_or(struct xaddr *dst, const struct xaddr *a, const struct xaddr *b) +{ + int i; + + if (dst == NULL || a == NULL || b == NULL || a->af != b->af) + return (-1); + + memcpy(dst, a, sizeof(*dst)); + switch (a->af) { + case AF_INET: + dst->v4.s_addr |= b->v4.s_addr; + return (0); + case AF_INET6: + for (i = 0; i < 4; i++) + dst->addr32[i] |= b->addr32[i]; + return (0); + default: + return (-1); + } +} + +int addr_cmp(const struct xaddr *a, const struct xaddr *b) { int i; @@ -278,6 +300,29 @@ addr_is_all0s(const struct xaddr *a) } } +/* Increment the specified address. Note, does not do overflow checking */ +void +addr_increment(struct xaddr *a) +{ + int i; + uint32_t n; + + switch (a->af) { + case AF_INET: + a->v4.s_addr = htonl(ntohl(a->v4.s_addr) + 1); + break; + case AF_INET6: + for (i = 0; i < 4; i++) { + /* Increment with carry */ + n = ntohl(a->addr32[3 - i]) + 1; + a->addr32[3 - i] = htonl(n); + if (n != 0) + break; + } + break; + } +} + /* * Test whether host portion of address 'a', as determined by 'masklen' * is all zeros. @@ -297,6 +342,32 @@ addr_host_is_all0s(const struct xaddr *a, u_int masklen) return addr_is_all0s(&tmp_result); } +#if 0 +int +addr_host_to_all0s(struct xaddr *a, u_int masklen) +{ + struct xaddr tmp_mask; + + if (addr_netmask(a->af, masklen, &tmp_mask) == -1) + return (-1); + if (addr_and(a, a, &tmp_mask) == -1) + return (-1); + return (0); +} +#endif + +int +addr_host_to_all1s(struct xaddr *a, u_int masklen) +{ + struct xaddr tmp_mask; + + if (addr_hostmask(a->af, masklen, &tmp_mask) == -1) + return (-1); + if (addr_or(a, a, &tmp_mask) == -1) + return (-1); + return (0); +} + /* * Parse string address 'p' into 'n'. * Returns 0 on success, -1 on failure. @@ -52,9 +52,13 @@ int addr_sa_pton(const char *h, const char *s, struct sockaddr *sa, int addr_pton_cidr(const char *p, struct xaddr *n, u_int *l); int addr_ntop(const struct xaddr *n, char *p, size_t len); int addr_and(struct xaddr *dst, const struct xaddr *a, const struct xaddr *b); +int addr_or(struct xaddr *dst, const struct xaddr *a, const struct xaddr *b); int addr_cmp(const struct xaddr *a, const struct xaddr *b); int addr_is_all0s(const struct xaddr *n); int addr_host_is_all0s(const struct xaddr *n, u_int masklen); +int addr_host_to_all0s(struct xaddr *a, u_int masklen); +int addr_host_to_all1s(struct xaddr *a, u_int masklen); int addr_netmatch(const struct xaddr *host, const struct xaddr *net, u_int masklen); +void addr_increment(struct xaddr *a); #endif /* _ADDR_H */ diff --git a/ssh-keyscan.1 b/ssh-keyscan.1 index 4eb0bea0..ca4feea2 100644 --- a/ssh-keyscan.1 +++ b/ssh-keyscan.1 @@ -1,4 +1,4 @@ -.\" $OpenBSD: ssh-keyscan.1,v 1.46 2022/06/03 04:00:15 dtucker Exp $ +.\" $OpenBSD: ssh-keyscan.1,v 1.47 2022/10/28 02:29:34 djm Exp $ .\" .\" Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>. .\" @@ -6,7 +6,7 @@ .\" permitted provided that due credit is given to the author and the .\" OpenBSD project by leaving this copyright notice intact. .\" -.Dd $Mdocdate: June 3 2022 $ +.Dd $Mdocdate: October 28 2022 $ .Dt SSH-KEYSCAN 1 .Os .Sh NAME @@ -44,6 +44,11 @@ For scanning, one does not need login access to the machines that are being scanned, nor does the scanning process involve any encryption. .Pp +Hosts to be scanned may be specified by hostname, address or by CIDR +network range (e.g. 192.168.16/28). +If a network range is specified, then all addresses in that range will +be scanned. +.Pp The options are as follows: .Bl -tag -width Ds .It Fl 4 @@ -73,9 +78,16 @@ If is supplied instead of a filename, .Nm will read from the standard input. -Input is expected in the format: +Names read from a file must start with an address, hostname or CIDR network +range to be scanned. +Addresses and hostnames may optionally be followed by comma-separated name +or address aliases that will be copied to the output. +For example: .Bd -literal -1.2.3.4,1.2.4.4 name.my.domain,name,n.my.domain,n,1.2.3.4,1.2.4.4 +192.168.11.0/24 +10.20.1.1 +happy.example.org +10.0.0.1,sad.example.org .Ed .It Fl H Hash all hostnames and addresses in the output. @@ -138,6 +150,10 @@ Print the RSA host key for machine .Pp .Dl $ ssh-keyscan -t rsa hostname .Pp +Search a network range, printing all supported key types: +.Pp +.Dl $ ssh-keyscan 192.168.0.64/25 +.Pp Find all hosts from the file .Pa ssh_hosts which have new or different keys from those in the sorted file diff --git a/ssh-keyscan.c b/ssh-keyscan.c index d7283136..a8ab932b 100644 --- a/ssh-keyscan.c +++ b/ssh-keyscan.c @@ -1,4 +1,4 @@ -/* $OpenBSD: ssh-keyscan.c,v 1.146 2022/08/19 04:02:46 dtucker Exp $ */ +/* $OpenBSD: ssh-keyscan.c,v 1.147 2022/10/28 02:29:34 djm Exp $ */ /* * Copyright 1995, 1996 by David Mazieres <dm@lcs.mit.edu>. * @@ -52,6 +52,7 @@ #include "ssherr.h" #include "ssh_api.h" #include "dns.h" +#include "addr.h" /* Flag indicating whether IPv4 or IPv6. This can be set on the command line. Default value is AF_UNSPEC means both IPv4 and IPv6. */ @@ -384,7 +385,7 @@ tcpconnect(char *host) } static int -conalloc(char *iname, char *oname, int keytype) +conalloc(const char *iname, const char *oname, int keytype) { char *namebase, *name, *namelist; int s; @@ -629,7 +630,7 @@ conloop(void) } static void -do_host(char *host) +do_one_host(char *host) { char *name = strnnsep(&host, " \t\n"); int j; @@ -645,6 +646,42 @@ do_host(char *host) } } +static void +do_host(char *host) +{ + char daddr[128]; + struct xaddr addr, end_addr; + u_int masklen; + + if (host == NULL) + return; + if (addr_pton_cidr(host, &addr, &masklen) != 0) { + /* Assume argument is a hostname */ + do_one_host(host); + } else { + /* Argument is a CIDR range */ + debug("CIDR range %s", host); + end_addr = addr; + if (addr_host_to_all1s(&end_addr, masklen) != 0) + goto badaddr; + /* + * Note: we deliberately include the all-zero/ones addresses. + */ + for (;;) { + if (addr_ntop(&addr, daddr, sizeof(daddr)) != 0) { + badaddr: + error("Invalid address %s", host); + return; + } + debug("CIDR expand: address %s", daddr); + do_one_host(daddr); + if (addr_cmp(&addr, &end_addr) == 0) + break; + addr_increment(&addr); + }; + } +} + void sshfatal(const char *file, const char *func, int line, int showfunc, LogLevel level, const char *suffix, const char *fmt, ...) |