468 lines
12 KiB
C
468 lines
12 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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#ifndef CURL_DISABLE_NETRC
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#ifdef HAVE_PWD_H
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#ifdef __AMIGA__
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#undef __NO_NET_API /* required for AmigaOS to declare getpwuid() */
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#endif
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#include <pwd.h>
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#ifdef __AMIGA__
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#define __NO_NET_API
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#endif
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#endif
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#include <curl/curl.h>
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#include "netrc.h"
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#include "strcase.h"
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#include "curl_get_line.h"
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#include "strparse.h"
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/* The last 3 #include files should be in this order */
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#include "curl_printf.h"
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#include "curl_memory.h"
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#include "memdebug.h"
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/* Get user and password from .netrc when given a machine name */
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enum host_lookup_state {
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NOTHING,
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HOSTFOUND, /* the 'machine' keyword was found */
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HOSTVALID, /* this is "our" machine! */
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MACDEF
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};
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enum found_state {
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NONE,
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LOGIN,
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PASSWORD
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};
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#define FOUND_LOGIN 1
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#define FOUND_PASSWORD 2
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#define MAX_NETRC_LINE 16384
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#define MAX_NETRC_FILE (128*1024)
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#define MAX_NETRC_TOKEN 4096
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/* convert a dynbuf call CURLcode error to a NETRCcode error */
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#define curl2netrc(result) \
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(((result) == CURLE_OUT_OF_MEMORY) ? \
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NETRC_OUT_OF_MEMORY : NETRC_SYNTAX_ERROR)
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static NETRCcode file2memory(const char *filename, struct dynbuf *filebuf)
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{
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NETRCcode ret = NETRC_FILE_MISSING; /* if it cannot open the file */
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FILE *file = fopen(filename, FOPEN_READTEXT);
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struct dynbuf linebuf;
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Curl_dyn_init(&linebuf, MAX_NETRC_LINE);
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if(file) {
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ret = NETRC_OK;
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while(Curl_get_line(&linebuf, file)) {
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CURLcode result;
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const char *line = Curl_dyn_ptr(&linebuf);
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/* skip comments on load */
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Curl_str_passblanks(&line);
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if(*line == '#')
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continue;
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result = Curl_dyn_add(filebuf, line);
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if(result) {
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ret = curl2netrc(result);
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goto done;
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}
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}
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}
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done:
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Curl_dyn_free(&linebuf);
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if(file)
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fclose(file);
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return ret;
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}
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/*
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* Returns zero on success.
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*/
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static NETRCcode parsenetrc(struct store_netrc *store,
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const char *host,
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char **loginp, /* might point to a username */
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char **passwordp,
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const char *netrcfile)
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{
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NETRCcode retcode = NETRC_NO_MATCH;
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char *login = *loginp;
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char *password = NULL;
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bool specific_login = !!login; /* points to something */
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enum host_lookup_state state = NOTHING;
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enum found_state keyword = NONE;
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unsigned char found = 0; /* login + password found bits, as they can come in
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any order */
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bool our_login = FALSE; /* found our login name */
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bool done = FALSE;
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char *netrcbuffer;
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struct dynbuf token;
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struct dynbuf *filebuf = &store->filebuf;
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DEBUGASSERT(!*passwordp);
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Curl_dyn_init(&token, MAX_NETRC_TOKEN);
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if(!store->loaded) {
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NETRCcode ret = file2memory(netrcfile, filebuf);
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if(ret)
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return ret;
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store->loaded = TRUE;
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}
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netrcbuffer = Curl_dyn_ptr(filebuf);
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while(!done) {
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const char *tok = netrcbuffer;
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while(tok && !done) {
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const char *tok_end;
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bool quoted;
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Curl_dyn_reset(&token);
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Curl_str_passblanks(&tok);
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/* tok is first non-space letter */
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if(state == MACDEF) {
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if((*tok == '\n') || (*tok == '\r'))
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state = NOTHING; /* end of macro definition */
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}
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if(!*tok || (*tok == '\n'))
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/* end of line */
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break;
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/* leading double-quote means quoted string */
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quoted = (*tok == '\"');
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tok_end = tok;
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if(!quoted) {
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size_t len = 0;
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CURLcode result;
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while(*tok_end > ' ') {
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tok_end++;
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len++;
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}
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if(!len) {
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retcode = NETRC_SYNTAX_ERROR;
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goto out;
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}
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result = Curl_dyn_addn(&token, tok, len);
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if(result) {
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retcode = curl2netrc(result);
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goto out;
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}
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}
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else {
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bool escape = FALSE;
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bool endquote = FALSE;
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tok_end++; /* pass the leading quote */
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while(*tok_end) {
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CURLcode result;
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char s = *tok_end;
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if(escape) {
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escape = FALSE;
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switch(s) {
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case 'n':
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s = '\n';
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break;
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case 'r':
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s = '\r';
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break;
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case 't':
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s = '\t';
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break;
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}
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}
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else if(s == '\\') {
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escape = TRUE;
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tok_end++;
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continue;
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}
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else if(s == '\"') {
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tok_end++; /* pass the ending quote */
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endquote = TRUE;
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break;
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}
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result = Curl_dyn_addn(&token, &s, 1);
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if(result) {
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retcode = curl2netrc(result);
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goto out;
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}
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tok_end++;
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}
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if(escape || !endquote) {
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/* bad syntax, get out */
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retcode = NETRC_SYNTAX_ERROR;
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goto out;
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}
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}
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tok = Curl_dyn_ptr(&token);
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switch(state) {
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case NOTHING:
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if(strcasecompare("macdef", tok))
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/* Define a macro. A macro is defined with the specified name; its
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contents begin with the next .netrc line and continue until a
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null line (consecutive new-line characters) is encountered. */
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state = MACDEF;
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else if(strcasecompare("machine", tok)) {
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/* the next tok is the machine name, this is in itself the delimiter
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that starts the stuff entered for this machine, after this we
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need to search for 'login' and 'password'. */
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state = HOSTFOUND;
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keyword = NONE;
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found = 0;
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our_login = FALSE;
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Curl_safefree(password);
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if(!specific_login)
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Curl_safefree(login);
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}
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else if(strcasecompare("default", tok)) {
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state = HOSTVALID;
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retcode = NETRC_OK; /* we did find our host */
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}
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break;
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case MACDEF:
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if(!*tok)
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state = NOTHING;
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break;
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case HOSTFOUND:
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if(strcasecompare(host, tok)) {
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/* and yes, this is our host! */
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state = HOSTVALID;
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retcode = NETRC_OK; /* we did find our host */
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}
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else
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/* not our host */
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state = NOTHING;
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break;
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case HOSTVALID:
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/* we are now parsing sub-keywords concerning "our" host */
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if(keyword == LOGIN) {
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if(specific_login)
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our_login = !Curl_timestrcmp(login, tok);
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else {
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our_login = TRUE;
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free(login);
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login = strdup(tok);
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if(!login) {
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retcode = NETRC_OUT_OF_MEMORY; /* allocation failed */
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goto out;
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}
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}
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found |= FOUND_LOGIN;
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keyword = NONE;
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}
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else if(keyword == PASSWORD) {
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free(password);
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password = strdup(tok);
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if(!password) {
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retcode = NETRC_OUT_OF_MEMORY; /* allocation failed */
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goto out;
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}
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if(!specific_login || our_login)
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found |= FOUND_PASSWORD;
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keyword = NONE;
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}
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else if(strcasecompare("login", tok))
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keyword = LOGIN;
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else if(strcasecompare("password", tok))
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keyword = PASSWORD;
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else if(strcasecompare("machine", tok)) {
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/* a new machine here */
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if(found & FOUND_PASSWORD) {
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done = TRUE;
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break;
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}
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state = HOSTFOUND;
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keyword = NONE;
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found = 0;
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Curl_safefree(password);
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if(!specific_login)
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Curl_safefree(login);
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}
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else if(strcasecompare("default", tok)) {
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state = HOSTVALID;
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retcode = NETRC_OK; /* we did find our host */
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Curl_safefree(password);
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if(!specific_login)
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Curl_safefree(login);
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}
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if((found == (FOUND_PASSWORD|FOUND_LOGIN)) && our_login) {
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done = TRUE;
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break;
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}
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break;
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} /* switch (state) */
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tok = ++tok_end;
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}
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if(!done) {
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char *nl = NULL;
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if(tok)
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nl = strchr(tok, '\n');
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if(!nl)
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break;
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/* point to next line */
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netrcbuffer = &nl[1];
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}
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} /* while !done */
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out:
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Curl_dyn_free(&token);
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if(!retcode) {
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if(!password && our_login) {
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/* success without a password, set a blank one */
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password = strdup("");
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if(!password)
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retcode = NETRC_OUT_OF_MEMORY; /* out of memory */
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}
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else if(!login && !password)
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/* a default with no credentials */
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retcode = NETRC_NO_MATCH;
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}
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if(!retcode) {
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/* success */
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if(!specific_login)
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*loginp = login;
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*passwordp = password;
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}
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else {
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Curl_dyn_free(filebuf);
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if(!specific_login)
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free(login);
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free(password);
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}
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return retcode;
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}
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const char *Curl_netrc_strerror(NETRCcode ret)
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{
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switch(ret) {
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default:
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return ""; /* not a legit error */
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case NETRC_FILE_MISSING:
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return "no such file";
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case NETRC_NO_MATCH:
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return "no matching entry";
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case NETRC_OUT_OF_MEMORY:
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return "out of memory";
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case NETRC_SYNTAX_ERROR:
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return "syntax error";
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}
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/* never reached */
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}
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/*
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* @unittest: 1304
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*
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* *loginp and *passwordp MUST be allocated if they are not NULL when passed
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* in.
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*/
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NETRCcode Curl_parsenetrc(struct store_netrc *store, const char *host,
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char **loginp, char **passwordp,
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char *netrcfile)
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{
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NETRCcode retcode = NETRC_OK;
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char *filealloc = NULL;
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if(!netrcfile) {
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#if defined(HAVE_GETPWUID_R) && defined(HAVE_GETEUID)
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char pwbuf[1024];
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#endif
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char *home = NULL;
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char *homea = curl_getenv("HOME"); /* portable environment reader */
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if(homea) {
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home = homea;
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#if defined(HAVE_GETPWUID_R) && defined(HAVE_GETEUID)
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}
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else {
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struct passwd pw, *pw_res;
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if(!getpwuid_r(geteuid(), &pw, pwbuf, sizeof(pwbuf), &pw_res)
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&& pw_res) {
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home = pw.pw_dir;
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}
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#elif defined(HAVE_GETPWUID) && defined(HAVE_GETEUID)
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}
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else {
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struct passwd *pw;
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pw = getpwuid(geteuid());
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if(pw) {
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home = pw->pw_dir;
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}
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#elif defined(_WIN32)
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}
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else {
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homea = curl_getenv("USERPROFILE");
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if(homea) {
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home = homea;
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}
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#endif
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}
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if(!home)
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return NETRC_FILE_MISSING; /* no home directory found (or possibly out
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of memory) */
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filealloc = aprintf("%s%s.netrc", home, DIR_CHAR);
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if(!filealloc) {
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free(homea);
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return NETRC_OUT_OF_MEMORY;
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}
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retcode = parsenetrc(store, host, loginp, passwordp, filealloc);
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free(filealloc);
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#ifdef _WIN32
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if(retcode == NETRC_FILE_MISSING) {
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/* fallback to the old-style "_netrc" file */
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filealloc = aprintf("%s%s_netrc", home, DIR_CHAR);
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if(!filealloc) {
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free(homea);
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return NETRC_OUT_OF_MEMORY;
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}
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retcode = parsenetrc(store, host, loginp, passwordp, filealloc);
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free(filealloc);
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}
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#endif
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free(homea);
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}
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else
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retcode = parsenetrc(store, host, loginp, passwordp, netrcfile);
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return retcode;
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}
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void Curl_netrc_init(struct store_netrc *s)
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{
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Curl_dyn_init(&s->filebuf, MAX_NETRC_FILE);
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s->loaded = FALSE;
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}
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void Curl_netrc_cleanup(struct store_netrc *s)
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{
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Curl_dyn_free(&s->filebuf);
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s->loaded = FALSE;
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}
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#endif
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