171 lines
4.3 KiB
C
171 lines
4.3 KiB
C
/****************************************************************************
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* apps/fsutils/passwd/passwd_find.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <assert.h>
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#include <errno.h>
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#include "passwd.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: passwd_find
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*
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* Description:
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* Find a password in the
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*
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* Input Parameters:
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*
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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is returned on
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* failure.
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*
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****************************************************************************/
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int passwd_find(FAR const char *username, FAR struct passwd_s *passwd)
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{
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FAR char *iobuffer;
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FAR char *name;
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FAR char *encrypted;
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FAR char *ptr;
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FILE *stream;
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off_t offset;
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int ret;
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/* Allocate an I/O buffer for the transfer */
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iobuffer = (FAR char *)malloc(CONFIG_FSUTILS_PASSWD_IOBUFFER_SIZE);
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if (iobuffer == NULL)
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{
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return -ENOMEM;
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}
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/* Open the password file for reading */
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stream = fopen(CONFIG_FSUTILS_PASSWD_PATH, "r");
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if (stream == NULL)
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{
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/* Free an I/O buffer for the transfer */
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free(iobuffer);
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int errcode = errno;
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DEBUGASSERT(errcode > 0);
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return -errcode;
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}
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/* Read the password file line by line until the record with the matching
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* username is found, or until the end of the file is reached.
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*
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* The format of the password file is:
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*
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* user:x:uid:gid:home
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*
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* Where:
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* user: User name
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* x: Encrypted password
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* uid: User ID
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* gid: Group ID
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* home: Login directory
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*/
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offset = 0;
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ret = -ENOENT;
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while (fgets(iobuffer, CONFIG_FSUTILS_PASSWD_IOBUFFER_SIZE, stream))
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{
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ptr = iobuffer;
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name = ptr;
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/* Skip to the end of the name and properly terminate it,. The name
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* must be terminated with the field delimiter ':'.
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*/
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for (; *ptr != '\0' && *ptr != ':'; ptr++);
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if (*ptr == '\0')
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{
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/* Bad file format? */
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continue;
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}
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*ptr++ = '\0';
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/* Check for a username match */
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if (strcmp(username, name) == 0)
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{
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/* We have a match. The encrypted password must immediately
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* follow the ':' delimiter.
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*/
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encrypted = ptr;
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/* Skip to the end of the encrypted password and properly
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* terminate it.
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*/
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for (; *ptr != '\0' && *ptr != ':'; ptr++);
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if (*ptr == '\0')
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{
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/* Bad file format? */
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ret = -EINVAL;
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break;
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}
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*ptr++ = '\0';
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/* Copy the offset and password into the returned structure */
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if (strlen(encrypted) >= MAX_ENCRYPTED)
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{
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ret = -E2BIG;
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break;
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}
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passwd->offset = offset;
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strlcpy(passwd->encrypted, encrypted, MAX_ENCRYPTED);
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ret = OK;
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break;
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}
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/* Get the next file offset */
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offset = ftell(stream);
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}
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fclose(stream);
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free(iobuffer);
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return ret;
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}
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