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311 lines
6.8 KiB
C
311 lines
6.8 KiB
C
/*-------------------------------------------------------------------------
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*
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* crypt.c
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* Look into pg_shadow and check the encrypted password with
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* the one passed in from the frontend.
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*
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* Modification History
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*
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* Dec 17, 1997 - Todd A. Brandys
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* Orignal Version Completed.
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*
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* $Id: crypt.c,v 1.21 1999/07/15 22:39:14 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "postgres.h"
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#include "miscadmin.h"
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#include "utils/nabstime.h"
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#include "storage/fd.h"
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#include "libpq/crypt.h"
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#ifdef HAVE_CRYPT_H
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#endif
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char **pwd_cache = NULL;
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int pwd_cache_count = 0;
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/*-------------------------------------------------------------------------*/
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char *
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crypt_getpwdfilename()
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{
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static char *pfnam = NULL;
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int bufsize;
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bufsize = strlen(DataDir) + strlen(CRYPT_PWD_FILE) + 2;
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pfnam = (char *) palloc(bufsize);
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snprintf(pfnam, bufsize, "%s/%s", DataDir, CRYPT_PWD_FILE);
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return pfnam;
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}
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/*-------------------------------------------------------------------------*/
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char *
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crypt_getpwdreloadfilename()
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{
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static char *rpfnam = NULL;
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char *pwdfilename;
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int bufsize;
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pwdfilename = crypt_getpwdfilename();
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bufsize = strlen(pwdfilename) + strlen(CRYPT_PWD_RELOAD_SUFX) + 1;
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rpfnam = (char *) palloc(bufsize);
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snprintf(rpfnam, bufsize, "%s%s", pwdfilename, CRYPT_PWD_RELOAD_SUFX);
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return rpfnam;
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}
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/*-------------------------------------------------------------------------*/
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static
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FILE *
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crypt_openpwdfile()
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{
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char *filename;
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FILE *pwdfile;
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filename = crypt_getpwdfilename();
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#ifndef __CYGWIN32__
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pwdfile = AllocateFile(filename, "r");
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#else
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pwdfile = AllocateFile(filename, "rb");
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#endif
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return pwdfile;
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}
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/*-------------------------------------------------------------------------*/
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static
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int
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compar_user(const void *user_a, const void *user_b)
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{
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int min,
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value;
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char *login_a;
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char *login_b;
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login_a = *((char **) user_a);
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login_b = *((char **) user_b);
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/*
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* We only really want to compare the user logins which are first. We
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* look for the first SEPSTR char getting the number of chars there
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* are before it. We only need to compare to the min count from the
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* two strings.
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*/
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min = strcspn(login_a, CRYPT_PWD_FILE_SEPSTR);
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value = strcspn(login_b, CRYPT_PWD_FILE_SEPSTR);
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if (value < min)
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min = value;
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/*
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* We add one to min so that the separator character is included in
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* the comparison. Why? I believe this will prevent logins that are
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* proper prefixes of other logins from being 'masked out'. Being
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* conservative!
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*/
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return strncmp(login_a, login_b, min + 1);
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}
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/*-------------------------------------------------------------------------*/
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static
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void
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crypt_loadpwdfile()
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{
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char *filename;
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int result;
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FILE *pwd_file;
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char buffer[256];
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filename = crypt_getpwdreloadfilename();
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result = unlink(filename);
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/*
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* We want to delete the flag file before reading the contents of the
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* pg_pwd file. If result == 0 then the unlink of the reload file was
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* successful. This means that a backend performed a COPY of the
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* pg_shadow file to pg_pwd. Therefore we must now do a reload.
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*/
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if (!pwd_cache || !result)
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{
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if (pwd_cache)
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{ /* free the old data only if this is a
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* reload */
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while (pwd_cache_count--)
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free((void *) pwd_cache[pwd_cache_count]);
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free((void *) pwd_cache);
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pwd_cache = NULL;
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pwd_cache_count = 0;
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}
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if (!(pwd_file = crypt_openpwdfile()))
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return;
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/*
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* Here is where we load the data from pg_pwd.
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*/
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while (fgets(buffer, 256, pwd_file) != NULL)
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{
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/*
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* We must remove the return char at the end of the string, as
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* this will affect the correct parsing of the password entry.
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*/
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if (buffer[(result = strlen(buffer) - 1)] == '\n')
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buffer[result] = '\0';
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pwd_cache = (char **) realloc((void *) pwd_cache, sizeof(char *) * (pwd_cache_count + 1));
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pwd_cache[pwd_cache_count++] = strdup(buffer);
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}
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FreeFile(pwd_file);
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/*
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* Now sort the entries in the cache for faster searching later.
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*/
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qsort((void *) pwd_cache, pwd_cache_count, sizeof(char *), compar_user);
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}
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}
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/*-------------------------------------------------------------------------*/
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static
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void
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crypt_parsepwdentry(char *buffer, char **pwd, char **valdate)
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{
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char *parse = buffer;
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int count,
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i;
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/*
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* skip to the password field
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*/
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for (i = 0; i < 6; i++)
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parse += (strcspn(parse, CRYPT_PWD_FILE_SEPSTR) + 1);
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/*
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* store a copy of user password to return
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*/
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count = strcspn(parse, CRYPT_PWD_FILE_SEPSTR);
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*pwd = (char *) palloc(count + 1);
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strncpy(*pwd, parse, count);
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(*pwd)[count] = '\0';
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parse += (count + 1);
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/*
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* store a copy of date login becomes invalid
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*/
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count = strcspn(parse, CRYPT_PWD_FILE_SEPSTR);
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*valdate = (char *) palloc(count + 1);
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strncpy(*valdate, parse, count);
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(*valdate)[count] = '\0';
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parse += (count + 1);
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}
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/*-------------------------------------------------------------------------*/
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static
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int
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crypt_getloginfo(const char *user, char **passwd, char **valuntil)
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{
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char *pwd,
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*valdate;
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void *fakeout;
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*passwd = NULL;
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*valuntil = NULL;
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crypt_loadpwdfile();
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if (pwd_cache)
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{
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char **pwd_entry;
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char user_search[NAMEDATALEN + 2];
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snprintf(user_search, NAMEDATALEN + 2, "%s\t", user);
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fakeout = (void *) &user_search;
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if ((pwd_entry = (char **) bsearch((void *) &fakeout, (void *) pwd_cache, pwd_cache_count, sizeof(char *), compar_user)))
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{
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crypt_parsepwdentry(*pwd_entry, &pwd, &valdate);
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*passwd = pwd;
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*valuntil = valdate;
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return STATUS_OK;
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}
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return STATUS_OK;
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}
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return STATUS_ERROR;
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}
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/*-------------------------------------------------------------------------*/
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int
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crypt_verify(Port *port, const char *user, const char *pgpass)
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{
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char *passwd,
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*valuntil,
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*crypt_pwd;
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int retval = STATUS_ERROR;
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AbsoluteTime vuntil,
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current;
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if (crypt_getloginfo(user, &passwd, &valuntil) == STATUS_ERROR)
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return STATUS_ERROR;
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if (passwd == NULL || *passwd == '\0')
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{
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if (passwd)
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pfree((void *) passwd);
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if (valuntil)
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pfree((void *) valuntil);
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return STATUS_ERROR;
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}
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/*
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* Compare with the encrypted or plain password depending on the
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* authentication method being used for this connection.
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*/
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crypt_pwd =
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(port->auth_method == uaCrypt ? crypt(passwd, port->salt) : passwd);
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if (!strcmp(pgpass, crypt_pwd))
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{
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/*
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* check here to be sure we are not past valuntil
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*/
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if (!valuntil || strcmp(valuntil, "\\N") == 0)
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vuntil = INVALID_ABSTIME;
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else
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vuntil = nabstimein(valuntil);
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current = GetCurrentAbsoluteTime();
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if (vuntil != INVALID_ABSTIME && vuntil < current)
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retval = STATUS_ERROR;
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else
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retval = STATUS_OK;
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}
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pfree((void *) passwd);
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if (valuntil)
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pfree((void *) valuntil);
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return retval;
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}
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