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 | |
25 | #if defined(USE_SSH) |
26 | |
27 | #include <curl/curl.h> |
28 | #include "curl_memory.h" |
29 | #include "curl_path.h" |
30 | #include "escape.h" |
31 | #include "memdebug.h" |
32 | |
33 | /* figure out the path to work with in this particular request */ |
34 | CURLcode Curl_getworkingpath(struct connectdata *conn, |
35 | char *homedir, /* when SFTP is used */ |
36 | char **path) /* returns the allocated |
37 | real path to work with */ |
38 | { |
39 | struct Curl_easy *data = conn->data; |
40 | char *real_path = NULL; |
41 | char *working_path; |
42 | size_t working_path_len; |
43 | CURLcode result = |
44 | Curl_urldecode(data, data->state.up.path, 0, &working_path, |
45 | &working_path_len, FALSE); |
46 | if(result) |
47 | return result; |
48 | |
49 | /* Check for /~/, indicating relative to the user's home directory */ |
50 | if(conn->handler->protocol & CURLPROTO_SCP) { |
51 | real_path = malloc(working_path_len + 1); |
52 | if(real_path == NULL) { |
53 | free(working_path); |
54 | return CURLE_OUT_OF_MEMORY; |
55 | } |
56 | if((working_path_len > 3) && (!memcmp(working_path, "/~/" , 3))) |
57 | /* It is referenced to the home directory, so strip the leading '/~/' */ |
58 | memcpy(real_path, working_path + 3, working_path_len - 2); |
59 | else |
60 | memcpy(real_path, working_path, 1 + working_path_len); |
61 | } |
62 | else if(conn->handler->protocol & CURLPROTO_SFTP) { |
63 | if((working_path_len > 1) && (working_path[1] == '~')) { |
64 | size_t homelen = strlen(homedir); |
65 | real_path = malloc(homelen + working_path_len + 1); |
66 | if(real_path == NULL) { |
67 | free(working_path); |
68 | return CURLE_OUT_OF_MEMORY; |
69 | } |
70 | /* It is referenced to the home directory, so strip the |
71 | leading '/' */ |
72 | memcpy(real_path, homedir, homelen); |
73 | real_path[homelen] = '/'; |
74 | real_path[homelen + 1] = '\0'; |
75 | if(working_path_len > 3) { |
76 | memcpy(real_path + homelen + 1, working_path + 3, |
77 | 1 + working_path_len -3); |
78 | } |
79 | } |
80 | else { |
81 | real_path = malloc(working_path_len + 1); |
82 | if(real_path == NULL) { |
83 | free(working_path); |
84 | return CURLE_OUT_OF_MEMORY; |
85 | } |
86 | memcpy(real_path, working_path, 1 + working_path_len); |
87 | } |
88 | } |
89 | |
90 | free(working_path); |
91 | |
92 | /* store the pointer for the caller to receive */ |
93 | *path = real_path; |
94 | |
95 | return CURLE_OK; |
96 | } |
97 | |
98 | /* The get_pathname() function is being borrowed from OpenSSH sftp.c |
99 | version 4.6p1. */ |
100 | /* |
101 | * Copyright (c) 2001-2004 Damien Miller <djm@openbsd.org> |
102 | * |
103 | * Permission to use, copy, modify, and distribute this software for any |
104 | * purpose with or without fee is hereby granted, provided that the above |
105 | * copyright notice and this permission notice appear in all copies. |
106 | * |
107 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
108 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
109 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
110 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
111 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
112 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
113 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
114 | */ |
115 | CURLcode Curl_get_pathname(const char **cpp, char **path, char *homedir) |
116 | { |
117 | const char *cp = *cpp, *end; |
118 | char quot; |
119 | unsigned int i, j; |
120 | size_t fullPathLength, pathLength; |
121 | bool relativePath = false; |
122 | static const char WHITESPACE[] = " \t\r\n" ; |
123 | |
124 | if(!*cp) { |
125 | *cpp = NULL; |
126 | *path = NULL; |
127 | return CURLE_QUOTE_ERROR; |
128 | } |
129 | /* Ignore leading whitespace */ |
130 | cp += strspn(cp, WHITESPACE); |
131 | /* Allocate enough space for home directory and filename + separator */ |
132 | fullPathLength = strlen(cp) + strlen(homedir) + 2; |
133 | *path = malloc(fullPathLength); |
134 | if(*path == NULL) |
135 | return CURLE_OUT_OF_MEMORY; |
136 | |
137 | /* Check for quoted filenames */ |
138 | if(*cp == '\"' || *cp == '\'') { |
139 | quot = *cp++; |
140 | |
141 | /* Search for terminating quote, unescape some chars */ |
142 | for(i = j = 0; i <= strlen(cp); i++) { |
143 | if(cp[i] == quot) { /* Found quote */ |
144 | i++; |
145 | (*path)[j] = '\0'; |
146 | break; |
147 | } |
148 | if(cp[i] == '\0') { /* End of string */ |
149 | /*error("Unterminated quote");*/ |
150 | goto fail; |
151 | } |
152 | if(cp[i] == '\\') { /* Escaped characters */ |
153 | i++; |
154 | if(cp[i] != '\'' && cp[i] != '\"' && |
155 | cp[i] != '\\') { |
156 | /*error("Bad escaped character '\\%c'", |
157 | cp[i]);*/ |
158 | goto fail; |
159 | } |
160 | } |
161 | (*path)[j++] = cp[i]; |
162 | } |
163 | |
164 | if(j == 0) { |
165 | /*error("Empty quotes");*/ |
166 | goto fail; |
167 | } |
168 | *cpp = cp + i + strspn(cp + i, WHITESPACE); |
169 | } |
170 | else { |
171 | /* Read to end of filename - either to white space or terminator */ |
172 | end = strpbrk(cp, WHITESPACE); |
173 | if(end == NULL) |
174 | end = strchr(cp, '\0'); |
175 | /* return pointer to second parameter if it exists */ |
176 | *cpp = end + strspn(end, WHITESPACE); |
177 | pathLength = 0; |
178 | relativePath = (cp[0] == '/' && cp[1] == '~' && cp[2] == '/'); |
179 | /* Handling for relative path - prepend home directory */ |
180 | if(relativePath) { |
181 | strcpy(*path, homedir); |
182 | pathLength = strlen(homedir); |
183 | (*path)[pathLength++] = '/'; |
184 | (*path)[pathLength] = '\0'; |
185 | cp += 3; |
186 | } |
187 | /* Copy path name up until first "white space" */ |
188 | memcpy(&(*path)[pathLength], cp, (int)(end - cp)); |
189 | pathLength += (int)(end - cp); |
190 | (*path)[pathLength] = '\0'; |
191 | } |
192 | return CURLE_OK; |
193 | |
194 | fail: |
195 | Curl_safefree(*path); |
196 | return CURLE_QUOTE_ERROR; |
197 | } |
198 | |
199 | #endif /* if SSH is used */ |
200 | |