1 files changed, 488 insertions, 0 deletions
diff --git a/contrib/pgcrypto/pgp-armor.c b/contrib/pgcrypto/pgp-armor.c
new file mode 100644
index 0000000..679779a
--- /dev/null
+++ b/contrib/pgcrypto/pgp-armor.c
@@ -0,0 +1,488 @@
+/*
+ * pgp-armor.c
+ *		PGP ascii-armor.
+ *
+ * Copyright (c) 2005 Marko Kreen
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *	  notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *	  notice, this list of conditions and the following disclaimer in the
+ *	  documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * contrib/pgcrypto/pgp-armor.c
+ */
+
+#include "postgres.h"
+
+#include "pgp.h"
+#include "px.h"
+
+/*
+ * BASE64 - duplicated :(
+ */
+
+static const unsigned char _base64[] =
+"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+static int
+pg_base64_encode(const uint8 *src, unsigned len, uint8 *dst)
+{
+	uint8	   *p,
+			   *lend = dst + 76;
+	const uint8 *s,
+			   *end = src + len;
+	int			pos = 2;
+	unsigned long buf = 0;
+
+	s = src;
+	p = dst;
+
+	while (s < end)
+	{
+		buf |= *s << (pos << 3);
+		pos--;
+		s++;
+
+		/*
+		 * write it out
+		 */
+		if (pos < 0)
+		{
+			*p++ = _base64[(buf >> 18) & 0x3f];
+			*p++ = _base64[(buf >> 12) & 0x3f];
+			*p++ = _base64[(buf >> 6) & 0x3f];
+			*p++ = _base64[buf & 0x3f];
+
+			pos = 2;
+			buf = 0;
+		}
+		if (p >= lend)
+		{
+			*p++ = '\n';
+			lend = p + 76;
+		}
+	}
+	if (pos != 2)
+	{
+		*p++ = _base64[(buf >> 18) & 0x3f];
+		*p++ = _base64[(buf >> 12) & 0x3f];
+		*p++ = (pos == 0) ? _base64[(buf >> 6) & 0x3f] : '=';
+		*p++ = '=';
+	}
+
+	return p - dst;
+}
+
+/* probably should use lookup table */
+static int
+pg_base64_decode(const uint8 *src, unsigned len, uint8 *dst)
+{
+	const uint8 *srcend = src + len,
+			   *s = src;
+	uint8	   *p = dst;
+	char		c;
+	unsigned	b = 0;
+	unsigned long buf = 0;
+	int			pos = 0,
+				end = 0;
+
+	while (s < srcend)
+	{
+		c = *s++;
+		if (c >= 'A' && c <= 'Z')
+			b = c - 'A';
+		else if (c >= 'a' && c <= 'z')
+			b = c - 'a' + 26;
+		else if (c >= '0' && c <= '9')
+			b = c - '0' + 52;
+		else if (c == '+')
+			b = 62;
+		else if (c == '/')
+			b = 63;
+		else if (c == '=')
+		{
+			/*
+			 * end sequence
+			 */
+			if (!end)
+			{
+				if (pos == 2)
+					end = 1;
+				else if (pos == 3)
+					end = 2;
+				else
+					return PXE_PGP_CORRUPT_ARMOR;
+			}
+			b = 0;
+		}
+		else if (c == ' ' || c == '\t' || c == '\n' || c == '\r')
+			continue;
+		else
+			return PXE_PGP_CORRUPT_ARMOR;
+
+		/*
+		 * add it to buffer
+		 */
+		buf = (buf << 6) + b;
+		pos++;
+		if (pos == 4)
+		{
+			*p++ = (buf >> 16) & 255;
+			if (end == 0 || end > 1)
+				*p++ = (buf >> 8) & 255;
+			if (end == 0 || end > 2)
+				*p++ = buf & 255;
+			buf = 0;
+			pos = 0;
+		}
+	}
+
+	if (pos != 0)
+		return PXE_PGP_CORRUPT_ARMOR;
+	return p - dst;
+}
+
+static unsigned
+pg_base64_enc_len(unsigned srclen)
+{
+	/*
+	 * 3 bytes will be converted to 4, linefeed after 76 chars
+	 */
+	return (srclen + 2) * 4 / 3 + srclen / (76 * 3 / 4);
+}
+
+static unsigned
+pg_base64_dec_len(unsigned srclen)
+{
+	return (srclen * 3) >> 2;
+}
+
+/*
+ * PGP armor
+ */
+
+static const char *armor_header = "-----BEGIN PGP MESSAGE-----\n";
+static const char *armor_footer = "\n-----END PGP MESSAGE-----\n";
+
+/* CRC24 implementation from rfc2440 */
+#define CRC24_INIT 0x00b704ceL
+#define CRC24_POLY 0x01864cfbL
+static long
+crc24(const uint8 *data, unsigned len)
+{
+	unsigned	crc = CRC24_INIT;
+	int			i;
+
+	while (len--)
+	{
+		crc ^= (*data++) << 16;
+		for (i = 0; i < 8; i++)
+		{
+			crc <<= 1;
+			if (crc & 0x1000000)
+				crc ^= CRC24_POLY;
+		}
+	}
+	return crc & 0xffffffL;
+}
+
+void
+pgp_armor_encode(const uint8 *src, unsigned len, StringInfo dst,
+				 int num_headers, char **keys, char **values)
+{
+	int			n;
+	int			res;
+	unsigned	b64len;
+	unsigned	crc = crc24(src, len);
+
+	appendStringInfoString(dst, armor_header);
+
+	for (n = 0; n < num_headers; n++)
+		appendStringInfo(dst, "%s: %s\n", keys[n], values[n]);
+	appendStringInfoChar(dst, '\n');
+
+	/* make sure we have enough room to pg_base64_encode() */
+	b64len = pg_base64_enc_len(len);
+	enlargeStringInfo(dst, (int) b64len);
+
+	res = pg_base64_encode(src, len, (uint8 *) dst->data + dst->len);
+	if (res > b64len)
+		elog(FATAL, "overflow - encode estimate too small");
+	dst->len += res;
+
+	if (*(dst->data + dst->len - 1) != '\n')
+		appendStringInfoChar(dst, '\n');
+
+	appendStringInfoChar(dst, '=');
+	appendStringInfoChar(dst, _base64[(crc >> 18) & 0x3f]);
+	appendStringInfoChar(dst, _base64[(crc >> 12) & 0x3f]);
+	appendStringInfoChar(dst, _base64[(crc >> 6) & 0x3f]);
+	appendStringInfoChar(dst, _base64[crc & 0x3f]);
+
+	appendStringInfoString(dst, armor_footer);
+}
+
+static const uint8 *
+find_str(const uint8 *data, const uint8 *data_end, const char *str, int strlen)
+{
+	const uint8 *p = data;
+
+	if (!strlen)
+		return NULL;
+	if (data_end - data < strlen)
+		return NULL;
+	while (p < data_end)
+	{
+		p = memchr(p, str[0], data_end - p);
+		if (p == NULL)
+			return NULL;
+		if (p + strlen > data_end)
+			return NULL;
+		if (memcmp(p, str, strlen) == 0)
+			return p;
+		p++;
+	}
+	return NULL;
+}
+
+static int
+find_header(const uint8 *data, const uint8 *datend,
+			const uint8 **start_p, int is_end)
+{
+	const uint8 *p = data;
+	static const char *start_sep = "-----BEGIN";
+	static const char *end_sep = "-----END";
+	const char *sep = is_end ? end_sep : start_sep;
+
+	/* find header line */
+	while (1)
+	{
+		p = find_str(p, datend, sep, strlen(sep));
+		if (p == NULL)
+			return PXE_PGP_CORRUPT_ARMOR;
+		/* it must start at beginning of line */
+		if (p == data || *(p - 1) == '\n')
+			break;
+		p += strlen(sep);
+	}
+	*start_p = p;
+	p += strlen(sep);
+
+	/* check if header text ok */
+	for (; p < datend && *p != '-'; p++)
+	{
+		/* various junk can be there, but definitely not line-feed	*/
+		if (*p >= ' ')
+			continue;
+		return PXE_PGP_CORRUPT_ARMOR;
+	}
+	if (datend - p < 5 || memcmp(p, sep, 5) != 0)
+		return PXE_PGP_CORRUPT_ARMOR;
+	p += 5;
+
+	/* check if at end of line */
+	if (p < datend)
+	{
+		if (*p != '\n' && *p != '\r')
+			return PXE_PGP_CORRUPT_ARMOR;
+		if (*p == '\r')
+			p++;
+		if (p < datend && *p == '\n')
+			p++;
+	}
+	return p - *start_p;
+}
+
+int
+pgp_armor_decode(const uint8 *src, int len, StringInfo dst)
+{
+	const uint8 *p = src;
+	const uint8 *data_end = src + len;
+	long		crc;
+	const uint8 *base64_start,
+			   *armor_end;
+	const uint8 *base64_end = NULL;
+	uint8		buf[4];
+	int			hlen;
+	int			blen;
+	int			res = PXE_PGP_CORRUPT_ARMOR;
+
+	/* armor start */
+	hlen = find_header(src, data_end, &p, 0);
+	if (hlen <= 0)
+		goto out;
+	p += hlen;
+
+	/* armor end */
+	hlen = find_header(p, data_end, &armor_end, 1);
+	if (hlen <= 0)
+		goto out;
+
+	/* skip comments - find empty line */
+	while (p < armor_end && *p != '\n' && *p != '\r')
+	{
+		p = memchr(p, '\n', armor_end - p);
+		if (!p)
+			goto out;
+
+		/* step to start of next line */
+		p++;
+	}
+	base64_start = p;
+
+	/* find crc pos */
+	for (p = armor_end; p >= base64_start; p--)
+		if (*p == '=')
+		{
+			base64_end = p - 1;
+			break;
+		}
+	if (base64_end == NULL)
+		goto out;
+
+	/* decode crc */
+	if (pg_base64_decode(p + 1, 4, buf) != 3)
+		goto out;
+	crc = (((long) buf[0]) << 16) + (((long) buf[1]) << 8) + (long) buf[2];
+
+	/* decode data */
+	blen = (int) pg_base64_dec_len(len);
+	enlargeStringInfo(dst, blen);
+	res = pg_base64_decode(base64_start, base64_end - base64_start, (uint8 *) dst->data);
+	if (res > blen)
+		elog(FATAL, "overflow - decode estimate too small");
+	if (res >= 0)
+	{
+		if (crc24((uint8 *) dst->data, res) == crc)
+			dst->len += res;
+		else
+			res = PXE_PGP_CORRUPT_ARMOR;
+	}
+out:
+	return res;
+}
+
+/*
+ * Extracts all armor headers from an ASCII-armored input.
+ *
+ * Returns 0 on success, or PXE_* error code on error. On success, the
+ * number of headers and their keys and values are returned in *nheaders,
+ * *nkeys and *nvalues.
+ */
+int
+pgp_extract_armor_headers(const uint8 *src, unsigned len,
+						  int *nheaders, char ***keys, char ***values)
+{
+	const uint8 *data_end = src + len;
+	const uint8 *p;
+	const uint8 *base64_start;
+	const uint8 *armor_start;
+	const uint8 *armor_end;
+	Size		armor_len;
+	char	   *line;
+	char	   *nextline;
+	char	   *eol,
+			   *colon;
+	int			hlen;
+	char	   *buf;
+	int			hdrlines;
+	int			n;
+
+	/* armor start */
+	hlen = find_header(src, data_end, &armor_start, 0);
+	if (hlen <= 0)
+		return PXE_PGP_CORRUPT_ARMOR;
+	armor_start += hlen;
+
+	/* armor end */
+	hlen = find_header(armor_start, data_end, &armor_end, 1);
+	if (hlen <= 0)
+		return PXE_PGP_CORRUPT_ARMOR;
+
+	/* Count the number of armor header lines. */
+	hdrlines = 0;
+	p = armor_start;
+	while (p < armor_end && *p != '\n' && *p != '\r')
+	{
+		p = memchr(p, '\n', armor_end - p);
+		if (!p)
+			return PXE_PGP_CORRUPT_ARMOR;
+
+		/* step to start of next line */
+		p++;
+		hdrlines++;
+	}
+	base64_start = p;
+
+	/*
+	 * Make a modifiable copy of the part of the input that contains the
+	 * headers. The returned key/value pointers will point inside the buffer.
+	 */
+	armor_len = base64_start - armor_start;
+	buf = palloc(armor_len + 1);
+	memcpy(buf, armor_start, armor_len);
+	buf[armor_len] = '\0';
+
+	/* Allocate return arrays */
+	*keys = (char **) palloc(hdrlines * sizeof(char *));
+	*values = (char **) palloc(hdrlines * sizeof(char *));
+
+	/*
+	 * Split the header lines at newlines and ": " separators, and collect
+	 * pointers to the keys and values in the return arrays.
+	 */
+	n = 0;
+	line = buf;
+	for (;;)
+	{
+		/* find end of line */
+		eol = strchr(line, '\n');
+		if (!eol)
+			break;
+		nextline = eol + 1;
+		/* if the line ends in CR + LF, strip the CR */
+		if (eol > line && *(eol - 1) == '\r')
+			eol--;
+		*eol = '\0';
+
+		/* find colon+space separating the key and value */
+		colon = strstr(line, ": ");
+		if (!colon)
+			return PXE_PGP_CORRUPT_ARMOR;
+		*colon = '\0';
+
+		/* shouldn't happen, we counted the number of lines beforehand */
+		if (n >= hdrlines)
+			elog(ERROR, "unexpected number of armor header lines");
+
+		(*keys)[n] = line;
+		(*values)[n] = colon + 2;
+		n++;
+
+		/* step to start of next line */
+		line = nextline;
+	}
+
+	if (n != hdrlines)
+		elog(ERROR, "unexpected number of armor header lines");
+
+	*nheaders = n;
+	return 0;
+}