354 lines
9.5 KiB
C
354 lines
9.5 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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#include <pwd.h>
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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 "strtok.h"
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#include "strcase.h"
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#include "curl_get_line.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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#define NETRC_FILE_MISSING 1
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#define NETRC_FAILED -1
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#define NETRC_SUCCESS 0
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#define MAX_NETRC_LINE 4096
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/*
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* Returns zero on success.
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*/
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static int parsenetrc(const char *host,
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char **loginp,
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char **passwordp,
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char *netrcfile)
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{
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FILE *file;
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int retcode = NETRC_FILE_MISSING;
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char *login = *loginp;
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char *password = *passwordp;
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bool specific_login = (login && *login != 0);
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bool login_alloc = FALSE;
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bool password_alloc = FALSE;
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enum host_lookup_state state = NOTHING;
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char state_login = 0; /* Found a login keyword */
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char state_password = 0; /* Found a password keyword */
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int state_our_login = TRUE; /* With specific_login, found *our* login
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name (or login-less line) */
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DEBUGASSERT(netrcfile);
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file = fopen(netrcfile, FOPEN_READTEXT);
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if(file) {
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bool done = FALSE;
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struct dynbuf buf;
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Curl_dyn_init(&buf, MAX_NETRC_LINE);
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while(!done && Curl_get_line(&buf, file)) {
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char *tok;
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char *tok_end;
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bool quoted;
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char *netrcbuffer = Curl_dyn_ptr(&buf);
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if(state == MACDEF) {
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if((netrcbuffer[0] == '\n') || (netrcbuffer[0] == '\r'))
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state = NOTHING;
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else
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continue;
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}
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tok = netrcbuffer;
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while(tok) {
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while(ISBLANK(*tok))
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tok++;
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/* tok is first non-space letter */
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if(!*tok || (*tok == '#'))
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/* end of line or the rest is a comment */
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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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while(!ISSPACE(*tok_end))
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tok_end++;
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*tok_end = 0;
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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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char *store = tok;
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tok_end++; /* pass the leading quote */
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while(*tok_end) {
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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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*store++ = s;
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tok_end++;
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}
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*store = 0;
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if(escape || !endquote) {
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/* bad syntax, get out */
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retcode = NETRC_FAILED;
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goto out;
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}
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}
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if((login && *login) && (password && *password)) {
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done = TRUE;
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break;
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}
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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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}
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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
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delimiter that starts the stuff entered for this machine,
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after this we need to search for 'login' and
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'password'. */
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state = HOSTFOUND;
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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_SUCCESS; /* 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(!strlen(tok)) {
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state = NOTHING;
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}
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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_SUCCESS; /* 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(state_login) {
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if(specific_login) {
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state_our_login = !Curl_timestrcmp(login, tok);
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}
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else if(!login || Curl_timestrcmp(login, tok)) {
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if(login_alloc) {
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free(login);
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login_alloc = FALSE;
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}
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login = strdup(tok);
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if(!login) {
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retcode = NETRC_FAILED; /* allocation failed */
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goto out;
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}
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login_alloc = TRUE;
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}
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state_login = 0;
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}
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else if(state_password) {
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if((state_our_login || !specific_login)
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&& (!password || Curl_timestrcmp(password, tok))) {
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if(password_alloc) {
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free(password);
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password_alloc = FALSE;
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}
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password = strdup(tok);
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if(!password) {
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retcode = NETRC_FAILED; /* allocation failed */
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goto out;
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}
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password_alloc = TRUE;
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}
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state_password = 0;
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}
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else if(strcasecompare("login", tok))
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state_login = 1;
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else if(strcasecompare("password", tok))
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state_password = 1;
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else if(strcasecompare("machine", tok)) {
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/* ok, there's machine here go => */
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state = HOSTFOUND;
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state_our_login = FALSE;
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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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} /* while Curl_get_line() */
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out:
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Curl_dyn_free(&buf);
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if(!retcode) {
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/* success */
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if(login_alloc) {
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if(*loginp)
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free(*loginp);
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*loginp = login;
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}
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if(password_alloc) {
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if(*passwordp)
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free(*passwordp);
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*passwordp = password;
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}
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}
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else {
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if(login_alloc)
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free(login);
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if(password_alloc)
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free(password);
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}
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fclose(file);
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}
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return retcode;
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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 aren't NULL when passed
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* in.
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*/
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int Curl_parsenetrc(const char *host, char **loginp, char **passwordp,
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char *netrcfile)
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{
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int retcode = 1;
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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 retcode; /* no home directory found (or possibly out of
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memory) */
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filealloc = curl_maprintf("%s%s.netrc", home, DIR_CHAR);
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if(!filealloc) {
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free(homea);
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return -1;
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}
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retcode = parsenetrc(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 = curl_maprintf("%s%s_netrc", home, DIR_CHAR);
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if(!filealloc) {
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free(homea);
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return -1;
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}
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retcode = parsenetrc(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(host, loginp, passwordp, netrcfile);
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return retcode;
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}
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#endif
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