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167 lines
3.5 KiB
C
167 lines
3.5 KiB
C
/*
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* PostgreSQL type definitions for chkpass
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* Written by D'Arcy J.M. Cain
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* darcy@druid.net
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* http://www.druid.net/darcy/
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*
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* contrib/chkpass/chkpass.c
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* best viewed with tabs set to 4
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*/
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#include "postgres.h"
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#include <time.h>
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#include <unistd.h>
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#ifdef HAVE_CRYPT_H
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#include <crypt.h>
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#endif
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#include "fmgr.h"
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#include "utils/builtins.h"
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PG_MODULE_MAGIC;
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/*
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* This type encrypts it's input unless the first character is a colon.
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* The output is the encrypted form with a leading colon. The output
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* format is designed to allow dump and reload operations to work as
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* expected without doing special tricks.
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*/
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/*
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* This is the internal storage format for CHKPASSs.
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* 15 is all I need but add a little buffer
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*/
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typedef struct chkpass
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{
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char password[16];
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} chkpass;
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/*
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* Various forward declarations:
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*/
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Datum chkpass_in(PG_FUNCTION_ARGS);
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Datum chkpass_out(PG_FUNCTION_ARGS);
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Datum chkpass_rout(PG_FUNCTION_ARGS);
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/* Only equal or not equal make sense */
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Datum chkpass_eq(PG_FUNCTION_ARGS);
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Datum chkpass_ne(PG_FUNCTION_ARGS);
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/* This function checks that the password is a good one
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* It's just a placeholder for now */
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static int
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verify_pass(const char *str)
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{
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return 0;
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}
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/*
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* CHKPASS reader.
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*/
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PG_FUNCTION_INFO_V1(chkpass_in);
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Datum
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chkpass_in(PG_FUNCTION_ARGS)
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{
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char *str = PG_GETARG_CSTRING(0);
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chkpass *result;
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char mysalt[4];
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char *crypt_output;
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static char salt_chars[] =
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"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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/* special case to let us enter encrypted passwords */
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if (*str == ':')
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{
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result = (chkpass *) palloc(sizeof(chkpass));
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strlcpy(result->password, str + 1, 13 + 1);
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PG_RETURN_POINTER(result);
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}
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if (verify_pass(str) != 0)
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ereport(ERROR,
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(errcode(ERRCODE_DATA_EXCEPTION),
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errmsg("password \"%s\" is weak", str)));
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result = (chkpass *) palloc(sizeof(chkpass));
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mysalt[0] = salt_chars[random() & 0x3f];
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mysalt[1] = salt_chars[random() & 0x3f];
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mysalt[2] = 0; /* technically the terminator is not necessary
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* but I like to play safe */
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if ((crypt_output = crypt(str, mysalt)) == NULL)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("crypt() failed")));
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strcpy(result->password, crypt_output);
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PG_RETURN_POINTER(result);
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}
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/*
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* CHKPASS output function.
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* Just like any string but we know it is max 15 (13 plus colon and terminator.)
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*/
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PG_FUNCTION_INFO_V1(chkpass_out);
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Datum
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chkpass_out(PG_FUNCTION_ARGS)
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{
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chkpass *password = (chkpass *) PG_GETARG_POINTER(0);
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char *result;
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result = (char *) palloc(16);
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result[0] = ':';
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strcpy(result + 1, password->password);
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PG_RETURN_CSTRING(result);
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}
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/*
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* special output function that doesn't output the colon
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*/
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PG_FUNCTION_INFO_V1(chkpass_rout);
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Datum
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chkpass_rout(PG_FUNCTION_ARGS)
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{
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chkpass *password = (chkpass *) PG_GETARG_POINTER(0);
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PG_RETURN_TEXT_P(cstring_to_text(password->password));
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}
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/*
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* Boolean tests
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*/
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PG_FUNCTION_INFO_V1(chkpass_eq);
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Datum
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chkpass_eq(PG_FUNCTION_ARGS)
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{
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chkpass *a1 = (chkpass *) PG_GETARG_POINTER(0);
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text *a2 = PG_GETARG_TEXT_PP(1);
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char str[9];
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text_to_cstring_buffer(a2, str, sizeof(str));
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PG_RETURN_BOOL(strcmp(a1->password, crypt(str, a1->password)) == 0);
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}
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PG_FUNCTION_INFO_V1(chkpass_ne);
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Datum
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chkpass_ne(PG_FUNCTION_ARGS)
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{
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chkpass *a1 = (chkpass *) PG_GETARG_POINTER(0);
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text *a2 = PG_GETARG_TEXT_PP(1);
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char str[9];
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text_to_cstring_buffer(a2, str, sizeof(str));
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PG_RETURN_BOOL(strcmp(a1->password, crypt(str, a1->password)) != 0);
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}
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