1: /***************************************************************************
2: * _ _ ____ _
3: * Project ___| | | | _ \| |
4: * / __| | | | |_) | |
5: * | (__| |_| | _ <| |___
6: * \___|\___/|_| \_\_____|
7: *
8: * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
9: *
10: * This software is licensed as described in the file COPYING, which
11: * you should have received as part of this distribution. The terms
12: * are also available at https://curl.haxx.se/docs/copyright.html.
13: *
14: * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15: * copies of the Software, and permit persons to whom the Software is
16: * furnished to do so, under the terms of the COPYING file.
17: *
18: * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19: * KIND, either express or implied.
20: *
21: ***************************************************************************/
22:
23: #include "curl_setup.h"
24: #ifndef CURL_DISABLE_NETRC
25:
26: #ifdef HAVE_PWD_H
27: #include <pwd.h>
28: #endif
29:
30: #include <curl/curl.h>
31: #include "netrc.h"
32: #include "strtok.h"
33: #include "strcase.h"
34:
35: /* The last 3 #include files should be in this order */
36: #include "curl_printf.h"
37: #include "curl_memory.h"
38: #include "memdebug.h"
39:
40: /* Get user and password from .netrc when given a machine name */
41:
42: enum host_lookup_state {
43: NOTHING,
44: HOSTFOUND, /* the 'machine' keyword was found */
45: HOSTVALID /* this is "our" machine! */
46: };
47:
48: #define NETRC_FILE_MISSING 1
49: #define NETRC_FAILED -1
50: #define NETRC_SUCCESS 0
51:
52: /*
53: * Returns zero on success.
54: */
55: static int parsenetrc(const char *host,
56: char **loginp,
57: char **passwordp,
58: bool *login_changed,
59: bool *password_changed,
60: char *netrcfile)
61: {
62: FILE *file;
63: int retcode = NETRC_FILE_MISSING;
64: char *login = *loginp;
65: char *password = *passwordp;
66: bool specific_login = (login && *login != 0);
67: bool login_alloc = FALSE;
68: bool password_alloc = FALSE;
69: enum host_lookup_state state = NOTHING;
70:
71: char state_login = 0; /* Found a login keyword */
72: char state_password = 0; /* Found a password keyword */
73: int state_our_login = FALSE; /* With specific_login, found *our* login
74: name */
75:
76: DEBUGASSERT(netrcfile);
77:
78: file = fopen(netrcfile, FOPEN_READTEXT);
79: if(file) {
80: char *tok;
81: char *tok_buf;
82: bool done = FALSE;
83: char netrcbuffer[4096];
84: int netrcbuffsize = (int)sizeof(netrcbuffer);
85:
86: while(!done && fgets(netrcbuffer, netrcbuffsize, file)) {
87: tok = strtok_r(netrcbuffer, " \t\n", &tok_buf);
88: if(tok && *tok == '#')
89: /* treat an initial hash as a comment line */
90: continue;
91: while(tok) {
92:
93: if((login && *login) && (password && *password)) {
94: done = TRUE;
95: break;
96: }
97:
98: switch(state) {
99: case NOTHING:
100: if(strcasecompare("machine", tok)) {
101: /* the next tok is the machine name, this is in itself the
102: delimiter that starts the stuff entered for this machine,
103: after this we need to search for 'login' and
104: 'password'. */
105: state = HOSTFOUND;
106: }
107: else if(strcasecompare("default", tok)) {
108: state = HOSTVALID;
109: retcode = NETRC_SUCCESS; /* we did find our host */
110: }
111: break;
112: case HOSTFOUND:
113: if(strcasecompare(host, tok)) {
114: /* and yes, this is our host! */
115: state = HOSTVALID;
116: retcode = NETRC_SUCCESS; /* we did find our host */
117: }
118: else
119: /* not our host */
120: state = NOTHING;
121: break;
122: case HOSTVALID:
123: /* we are now parsing sub-keywords concerning "our" host */
124: if(state_login) {
125: if(specific_login) {
126: state_our_login = strcasecompare(login, tok);
127: }
128: else if(!login || strcmp(login, tok)) {
129: if(login_alloc) {
130: free(login);
131: login_alloc = FALSE;
132: }
133: login = strdup(tok);
134: if(!login) {
135: retcode = NETRC_FAILED; /* allocation failed */
136: goto out;
137: }
138: login_alloc = TRUE;
139: }
140: state_login = 0;
141: }
142: else if(state_password) {
143: if((state_our_login || !specific_login)
144: && (!password || strcmp(password, tok))) {
145: if(password_alloc) {
146: free(password);
147: password_alloc = FALSE;
148: }
149: password = strdup(tok);
150: if(!password) {
151: retcode = NETRC_FAILED; /* allocation failed */
152: goto out;
153: }
154: password_alloc = TRUE;
155: }
156: state_password = 0;
157: }
158: else if(strcasecompare("login", tok))
159: state_login = 1;
160: else if(strcasecompare("password", tok))
161: state_password = 1;
162: else if(strcasecompare("machine", tok)) {
163: /* ok, there's machine here go => */
164: state = HOSTFOUND;
165: state_our_login = FALSE;
166: }
167: break;
168: } /* switch (state) */
169:
170: tok = strtok_r(NULL, " \t\n", &tok_buf);
171: } /* while(tok) */
172: } /* while fgets() */
173:
174: out:
175: if(!retcode) {
176: /* success */
177: *login_changed = FALSE;
178: *password_changed = FALSE;
179: if(login_alloc) {
180: if(*loginp)
181: free(*loginp);
182: *loginp = login;
183: *login_changed = TRUE;
184: }
185: if(password_alloc) {
186: if(*passwordp)
187: free(*passwordp);
188: *passwordp = password;
189: *password_changed = TRUE;
190: }
191: }
192: else {
193: if(login_alloc)
194: free(login);
195: if(password_alloc)
196: free(password);
197: }
198: fclose(file);
199: }
200:
201: return retcode;
202: }
203:
204: /*
205: * @unittest: 1304
206: *
207: * *loginp and *passwordp MUST be allocated if they aren't NULL when passed
208: * in.
209: */
210: int Curl_parsenetrc(const char *host,
211: char **loginp,
212: char **passwordp,
213: bool *login_changed,
214: bool *password_changed,
215: char *netrcfile)
216: {
217: int retcode = 1;
218: char *filealloc = NULL;
219:
220: if(!netrcfile) {
221: char *home = NULL;
222: char *homea = curl_getenv("HOME"); /* portable environment reader */
223: if(homea) {
224: home = homea;
225: #if defined(HAVE_GETPWUID_R) && defined(HAVE_GETEUID)
226: }
227: else {
228: struct passwd pw, *pw_res;
229: char pwbuf[1024];
230: if(!getpwuid_r(geteuid(), &pw, pwbuf, sizeof(pwbuf), &pw_res)
231: && pw_res) {
232: home = pw.pw_dir;
233: }
234: #elif defined(HAVE_GETPWUID) && defined(HAVE_GETEUID)
235: }
236: else {
237: struct passwd *pw;
238: pw = getpwuid(geteuid());
239: if(pw) {
240: home = pw->pw_dir;
241: }
242: #endif
243: }
244:
245: if(!home)
246: return retcode; /* no home directory found (or possibly out of
247: memory) */
248:
249: filealloc = curl_maprintf("%s%s.netrc", home, DIR_CHAR);
250: if(!filealloc) {
251: free(homea);
252: return -1;
253: }
254: retcode = parsenetrc(host, loginp, passwordp, login_changed,
255: password_changed, filealloc);
256: free(filealloc);
257: #ifdef WIN32
258: if(retcode == NETRC_FILE_MISSING) {
259: /* fallback to the old-style "_netrc" file */
260: filealloc = curl_maprintf("%s%s_netrc", home, DIR_CHAR);
261: if(!filealloc) {
262: free(homea);
263: return -1;
264: }
265: retcode = parsenetrc(host, loginp, passwordp, login_changed,
266: password_changed, filealloc);
267: free(filealloc);
268: }
269: #endif
270: free(homea);
271: }
272: else
273: retcode = parsenetrc(host, loginp, passwordp, login_changed,
274: password_changed, netrcfile);
275: return retcode;
276: }
277:
278: #endif
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