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ad5b6f248a
This reverts commits ab27df2, af8d530 and 3a0cced, that introduced pg_cryptohash_error(). In order to make the core code able to pass down the new error types that this introduced, some of the MD5-related routines had to be reworked, causing an ABI breakage, but we found that some external extensions rely on them. Maintaining compatibility outweights the error report benefits, so just revert the change in v14. Reported-by: Laurenz Albe Discussion: https://postgr.es/m/9f0c0a96d28cf14fc87296bbe67061c14eb53ae8.camel@cybertec.at
150 lines
3.4 KiB
C
150 lines
3.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* md5_common.c
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* Routines shared between all MD5 implementations used for encrypted
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* passwords.
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*
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* Sverre H. Huseby <sverrehu@online.no>
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*
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* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* src/common/md5_common.c
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef FRONTEND
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#include "postgres.h"
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#else
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#include "postgres_fe.h"
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#endif
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#include "common/cryptohash.h"
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#include "common/md5.h"
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static void
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bytesToHex(uint8 b[16], char *s)
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{
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static const char *hex = "0123456789abcdef";
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int q,
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w;
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for (q = 0, w = 0; q < 16; q++)
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{
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s[w++] = hex[(b[q] >> 4) & 0x0F];
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s[w++] = hex[b[q] & 0x0F];
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}
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s[w] = '\0';
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}
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/*
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* pg_md5_hash
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*
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* Calculates the MD5 sum of the bytes in a buffer.
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*
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* SYNOPSIS #include "md5.h"
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* int pg_md5_hash(const void *buff, size_t len, char *hexsum)
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*
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* INPUT buff the buffer containing the bytes that you want
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* the MD5 sum of.
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* len number of bytes in the buffer.
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*
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* OUTPUT hexsum the MD5 sum as a '\0'-terminated string of
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* hexadecimal digits. an MD5 sum is 16 bytes long.
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* each byte is represented by two hexadecimal
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* characters. you thus need to provide an array
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* of 33 characters, including the trailing '\0'.
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*
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* RETURNS false on failure (out of memory for internal buffers
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* or MD5 computation failure) or true on success.
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*
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* STANDARDS MD5 is described in RFC 1321.
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*
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* AUTHOR Sverre H. Huseby <sverrehu@online.no>
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*
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*/
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bool
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pg_md5_hash(const void *buff, size_t len, char *hexsum)
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{
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uint8 sum[MD5_DIGEST_LENGTH];
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pg_cryptohash_ctx *ctx;
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ctx = pg_cryptohash_create(PG_MD5);
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if (ctx == NULL)
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return false;
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if (pg_cryptohash_init(ctx) < 0 ||
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pg_cryptohash_update(ctx, buff, len) < 0 ||
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pg_cryptohash_final(ctx, sum, sizeof(sum)) < 0)
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{
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pg_cryptohash_free(ctx);
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return false;
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}
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bytesToHex(sum, hexsum);
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pg_cryptohash_free(ctx);
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return true;
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}
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bool
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pg_md5_binary(const void *buff, size_t len, void *outbuf)
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{
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pg_cryptohash_ctx *ctx;
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ctx = pg_cryptohash_create(PG_MD5);
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if (ctx == NULL)
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return false;
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if (pg_cryptohash_init(ctx) < 0 ||
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pg_cryptohash_update(ctx, buff, len) < 0 ||
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pg_cryptohash_final(ctx, outbuf, MD5_DIGEST_LENGTH) < 0)
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{
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pg_cryptohash_free(ctx);
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return false;
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}
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pg_cryptohash_free(ctx);
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return true;
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}
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/*
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* Computes MD5 checksum of "passwd" (a null-terminated string) followed
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* by "salt" (which need not be null-terminated).
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*
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* Output format is "md5" followed by a 32-hex-digit MD5 checksum.
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* Hence, the output buffer "buf" must be at least 36 bytes long.
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*
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* Returns true if okay, false on error (out of memory).
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*/
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bool
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pg_md5_encrypt(const char *passwd, const char *salt, size_t salt_len,
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char *buf)
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{
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size_t passwd_len = strlen(passwd);
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/* +1 here is just to avoid risk of unportable malloc(0) */
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char *crypt_buf = malloc(passwd_len + salt_len + 1);
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bool ret;
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if (!crypt_buf)
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return false;
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/*
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* Place salt at the end because it may be known by users trying to crack
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* the MD5 output.
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*/
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memcpy(crypt_buf, passwd, passwd_len);
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memcpy(crypt_buf + passwd_len, salt, salt_len);
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strcpy(buf, "md5");
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ret = pg_md5_hash(crypt_buf, passwd_len + salt_len, buf + 3);
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free(crypt_buf);
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return ret;
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}
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