Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 402 insertions, 0 deletions

diff --git a/src/util/valid_hostname.c b/src/util/valid_hostname.c
new file mode 100644
index 0000000..07c9eca
--- /dev/null
+++ b/src/util/valid_hostname.c
@@ -0,0 +1,402 @@
+/*++
+/* NAME
+/*	valid_hostname 3
+/* SUMMARY
+/*	network name validation
+/* SYNOPSIS
+/*	#include <valid_hostname.h>
+/*
+/*	int	valid_hostname(name, gripe)
+/*	const char *name;
+/*	int	gripe;
+/*
+/*	int	valid_hostaddr(addr, gripe)
+/*	const char *addr;
+/*	int	gripe;
+/*
+/*	int	valid_ipv4_hostaddr(addr, gripe)
+/*	const char *addr;
+/*	int	gripe;
+/*
+/*	int	valid_ipv6_hostaddr(addr, gripe)
+/*	const char *addr;
+/*	int	gripe;
+/*
+/*	int	valid_hostport(port, gripe)
+/*	const char *port;
+/*	int	gripe;
+/* DESCRIPTION
+/*	valid_hostname() scrutinizes a hostname: the name should
+/*	be no longer than VALID_HOSTNAME_LEN characters, should
+/*	contain only letters, digits, dots and hyphens, no adjacent
+/*	dots, no leading or trailing dots or hyphens, no labels
+/*	longer than VALID_LABEL_LEN characters, and it should not
+/*	be all numeric.
+/*
+/*	valid_hostaddr() requires that the input is a valid string
+/*	representation of an IPv4 or IPv6 network address as
+/*	described next.
+/*
+/*	valid_ipv4_hostaddr() and valid_ipv6_hostaddr() implement
+/*	protocol-specific address syntax checks. A valid IPv4
+/*	address is in dotted-quad decimal form. A valid IPv6 address
+/*	has 16-bit hexadecimal fields separated by ":", and does not
+/*	include the RFC 2821 style "IPv6:" prefix.
+/*
+/*	These routines operate silently unless the gripe parameter
+/*	specifies a non-zero value. The macros DO_GRIPE and DONT_GRIPE
+/*	provide suitable constants.
+/*
+/*	valid_hostport() requires that the input is a valid string
+/*	representation of a TCP or UDP port number.
+/* BUGS
+/*	valid_hostmumble() does not guarantee that string lengths
+/*	fit the buffer sizes defined in myaddrinfo(3h).
+/* DIAGNOSTICS
+/*	All functions return zero if they disagree with the input.
+/* SEE ALSO
+/*	RFC 952, RFC 1123, RFC 1035, RFC 2373.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <string.h>
+#include <ctype.h>
+#include <stdlib.h>
+
+/* Utility library. */
+
+#include "msg.h"
+#include "mymalloc.h"
+#include "stringops.h"
+#include "valid_hostname.h"
+
+/* valid_hostname - screen out bad hostnames */
+
+int     valid_hostname(const char *name, int gripe)
+{
+    const char *myname = "valid_hostname";
+    const char *cp;
+    int     label_length = 0;
+    int     label_count = 0;
+    int     non_numeric = 0;
+    int     ch;
+
+    /*
+     * Trivial cases first.
+     */
+    if (*name == 0) {
+	if (gripe)
+	    msg_warn("%s: empty hostname", myname);
+	return (0);
+    }
+
+    /*
+     * Find bad characters or label lengths. Find adjacent delimiters.
+     */
+    for (cp = name; (ch = *(unsigned char *) cp) != 0; cp++) {
+	if (ISALNUM(ch) || ch == '_') {		/* grr.. */
+	    if (label_length == 0)
+		label_count++;
+	    label_length++;
+	    if (label_length > VALID_LABEL_LEN) {
+		if (gripe)
+		    msg_warn("%s: hostname label too long: %.100s", myname, name);
+		return (0);
+	    }
+	    if (!ISDIGIT(ch))
+		non_numeric = 1;
+	} else if (ch == '.') {
+	    if (label_length == 0 || cp[1] == 0) {
+		if (gripe)
+		    msg_warn("%s: misplaced delimiter: %.100s", myname, name);
+		return (0);
+	    }
+	    label_length = 0;
+	} else if (ch == '-') {
+	    non_numeric = 1;
+	    label_length++;
+	    if (label_length == 1 || cp[1] == 0 || cp[1] == '.') {
+		if (gripe)
+		    msg_warn("%s: misplaced hyphen: %.100s", myname, name);
+		return (0);
+	    }
+	}
+#ifdef SLOPPY_VALID_HOSTNAME
+	else if (ch == ':' && valid_ipv6_hostaddr(name, DONT_GRIPE)) {
+	    non_numeric = 0;
+	    break;
+	}
+#endif
+	else {
+	    if (gripe)
+		msg_warn("%s: invalid character %d(decimal): %.100s",
+			 myname, ch, name);
+	    return (0);
+	}
+    }
+
+    if (non_numeric == 0) {
+	if (gripe)
+	    msg_warn("%s: numeric hostname: %.100s", myname, name);
+#ifndef SLOPPY_VALID_HOSTNAME
+	return (0);
+#endif
+    }
+    if (cp - name > VALID_HOSTNAME_LEN) {
+	if (gripe)
+	    msg_warn("%s: bad length %d for %.100s...",
+		     myname, (int) (cp - name), name);
+	return (0);
+    }
+    return (1);
+}
+
+/* valid_hostaddr - verify numerical address syntax */
+
+int     valid_hostaddr(const char *addr, int gripe)
+{
+    const char *myname = "valid_hostaddr";
+
+    /*
+     * Trivial cases first.
+     */
+    if (*addr == 0) {
+	if (gripe)
+	    msg_warn("%s: empty address", myname);
+	return (0);
+    }
+
+    /*
+     * Protocol-dependent processing next.
+     */
+    if (strchr(addr, ':') != 0)
+	return (valid_ipv6_hostaddr(addr, gripe));
+    else
+	return (valid_ipv4_hostaddr(addr, gripe));
+}
+
+/* valid_ipv4_hostaddr - test dotted quad string for correctness */
+
+int     valid_ipv4_hostaddr(const char *addr, int gripe)
+{
+    const char *cp;
+    const char *myname = "valid_ipv4_hostaddr";
+    int     in_byte = 0;
+    int     byte_count = 0;
+    int     byte_val = 0;
+    int     ch;
+
+#define BYTES_NEEDED	4
+
+    /*
+     * Scary code to avoid sscanf() overflow nasties.
+     * 
+     * This routine is called by valid_ipv6_hostaddr(). It must not call that
+     * routine, to avoid deadly recursion.
+     */
+    for (cp = addr; (ch = *(unsigned const char *) cp) != 0; cp++) {
+	if (ISDIGIT(ch)) {
+	    if (in_byte == 0) {
+		in_byte = 1;
+		byte_val = 0;
+		byte_count++;
+	    }
+	    byte_val *= 10;
+	    byte_val += ch - '0';
+	    if (byte_val > 255) {
+		if (gripe)
+		    msg_warn("%s: invalid octet value: %.100s", myname, addr);
+		return (0);
+	    }
+	} else if (ch == '.') {
+	    if (in_byte == 0 || cp[1] == 0) {
+		if (gripe)
+		    msg_warn("%s: misplaced dot: %.100s", myname, addr);
+		return (0);
+	    }
+	    /* XXX Allow 0.0.0.0 but not 0.1.2.3 */
+	    if (byte_count == 1 && byte_val == 0 && addr[strspn(addr, "0.")]) {
+		if (gripe)
+		    msg_warn("%s: bad initial octet value: %.100s", myname, addr);
+		return (0);
+	    }
+	    in_byte = 0;
+	} else {
+	    if (gripe)
+		msg_warn("%s: invalid character %d(decimal): %.100s",
+			 myname, ch, addr);
+	    return (0);
+	}
+    }
+
+    if (byte_count != BYTES_NEEDED) {
+	if (gripe)
+	    msg_warn("%s: invalid octet count: %.100s", myname, addr);
+	return (0);
+    }
+    return (1);
+}
+
+/* valid_ipv6_hostaddr - validate IPv6 address syntax */
+
+int     valid_ipv6_hostaddr(const char *addr, int gripe)
+{
+    const char *myname = "valid_ipv6_hostaddr";
+    int     null_field = 0;
+    int     field = 0;
+    unsigned char *cp = (unsigned char *) addr;
+    int     len = 0;
+
+    /*
+     * FIX 200501 The IPv6 patch validated syntax with getaddrinfo(), but I
+     * am not confident that everyone's system library routines are robust
+     * enough, like buffer overflow free. Remember, the valid_hostmumble()
+     * routines are meant to protect Postfix against malformed information in
+     * data received from the network.
+     * 
+     * We require eight-field hex addresses of the form 0:1:2:3:4:5:6:7,
+     * 0:1:2:3:4:5:6a.6b.7c.7d, or some :: compressed version of the same.
+     * 
+     * Note: the character position is advanced inside the loop. I have added
+     * comments to show why we can't get stuck.
+     */
+    for (;;) {
+	switch (*cp) {
+	case 0:
+	    /* Terminate the loop. */
+	    if (field < 2) {
+		if (gripe)
+		    msg_warn("%s: too few `:' in IPv6 address: %.100s",
+			     myname, addr);
+		return (0);
+	    } else if (len == 0 && null_field != field - 1) {
+		if (gripe)
+		    msg_warn("%s: bad null last field in IPv6 address: %.100s",
+			     myname, addr);
+		return (0);
+	    } else
+		return (1);
+	case '.':
+	    /* Terminate the loop. */
+	    if (field < 2 || field > 6) {
+		if (gripe)
+		    msg_warn("%s: malformed IPv4-in-IPv6 address: %.100s",
+			     myname, addr);
+		return (0);
+	    } else
+		/* NOT: valid_hostaddr(). Avoid recursion. */
+		return (valid_ipv4_hostaddr((char *) cp - len, gripe));
+	case ':':
+	    /* Advance by exactly 1 character position or terminate. */
+	    if (field == 0 && len == 0 && ISALNUM(cp[1])) {
+		if (gripe)
+		    msg_warn("%s: bad null first field in IPv6 address: %.100s",
+			     myname, addr);
+		return (0);
+	    }
+	    field++;
+	    if (field > 7) {
+		if (gripe)
+		    msg_warn("%s: too many `:' in IPv6 address: %.100s",
+			     myname, addr);
+		return (0);
+	    }
+	    cp++;
+	    len = 0;
+	    if (*cp == ':') {
+		if (null_field > 0) {
+		    if (gripe)
+			msg_warn("%s: too many `::' in IPv6 address: %.100s",
+				 myname, addr);
+		    return (0);
+		}
+		null_field = field;
+	    }
+	    break;
+	default:
+	    /* Advance by at least 1 character position or terminate. */
+	    len = strspn((char *) cp, "0123456789abcdefABCDEF");
+	    if (len /* - strspn((char *) cp, "0") */ > 4) {
+		if (gripe)
+		    msg_warn("%s: malformed IPv6 address: %.100s",
+			     myname, addr);
+		return (0);
+	    }
+	    if (len <= 0) {
+		if (gripe)
+		    msg_warn("%s: invalid character %d(decimal) in IPv6 address: %.100s",
+			     myname, *cp, addr);
+		return (0);
+	    }
+	    cp += len;
+	    break;
+	}
+    }
+}
+
+/* valid_hostport - validate numeric port */
+
+int     valid_hostport(const char *str, int gripe)
+{
+    const char *myname = "valid_hostport";
+    int     port;
+
+    if (str[0] == '0' && str[1] != 0) {
+	if (gripe)
+	    msg_warn("%s: leading zero in port number: %.100s", myname, str);
+	return (0);
+    }
+    if (alldig(str) == 0) {
+	if (gripe)
+	    msg_warn("%s: non-numeric port number: %.100s", myname, str);
+	return (0);
+    }
+    if (strlen(str) > strlen("65535")
+	|| (port = atoi(str)) > 65535 || port < 0) {
+	if (gripe)
+	    msg_warn("%s: out-of-range port number: %.100s", myname, str);
+	return (0);
+    }
+    return (1);
+}
+
+#ifdef TEST
+
+ /*
+  * Test program - reads hostnames from stdin, reports invalid hostnames to
+  * stderr.
+  */
+#include <stdlib.h>
+
+#include "vstring.h"
+#include "vstream.h"
+#include "vstring_vstream.h"
+#include "msg_vstream.h"
+
+int     main(int unused_argc, char **argv)
+{
+    VSTRING *buffer = vstring_alloc(1);
+
+    msg_vstream_init(argv[0], VSTREAM_ERR);
+    msg_verbose = 1;
+
+    while (vstring_fgets_nonl(buffer, VSTREAM_IN)) {
+	msg_info("testing: \"%s\"", vstring_str(buffer));
+	valid_hostname(vstring_str(buffer), DO_GRIPE);
+	valid_hostaddr(vstring_str(buffer), DO_GRIPE);
+    }
+    exit(0);
+}
+
+#endif