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authorZenju <zenju@gmx.de>2019-09-25 17:48:53 +0200
committerDaniel Stenberg <daniel@haxx.se>2019-09-27 08:29:54 +0200
commit500fb0e4cb586ed31f5bb890ff918785eaa339e3 (patch)
treea249e444da36b72889050e49e47e26d817fed627 /lib
parent73089bf7f39e264ab29d9360e430ebe573c39b78 (diff)
FTP: url-decode path before evaluation
Closes #4428
Diffstat (limited to 'lib')
-rw-r--r--lib/ftp.c293
-rw-r--r--lib/ftp.h1
2 files changed, 124 insertions, 170 deletions
diff --git a/lib/ftp.c b/lib/ftp.c
index 33d9be45e..8072a33d5 100644
--- a/lib/ftp.c
+++ b/lib/ftp.c
@@ -1446,22 +1446,30 @@ static CURLcode ftp_state_list(struct connectdata *conn)
The other ftp_filemethods will CWD into dir/dir/ first and
then just do LIST (in that case: nothing to do here)
*/
- char *cmd, *lstArg;
- const char *inpath = ftp->path;
-
- lstArg = NULL;
- if((data->set.ftp_filemethod == FTPFILE_NOCWD) &&
- inpath && inpath[0] && strchr(inpath, '/')) {
- /* chop off the file part if format is dir/file
- otherwise remove the trailing slash for dir/dir/
- and full paths like %2f/ except for / */
- size_t n = strrchr(inpath, '/') - inpath;
- if(n == 0)
- ++n;
-
- result = Curl_urldecode(data, inpath, n, &lstArg, NULL, TRUE);
+ char *lstArg = NULL;
+ char *cmd;
+
+ if((data->set.ftp_filemethod == FTPFILE_NOCWD) && ftp->path) {
+ /* url-decode before evaluation: e.g. paths starting/ending with %2f */
+ const char *slashPos = NULL;
+ char *rawPath = NULL;
+ result = Curl_urldecode(data, ftp->path, 0, &rawPath, NULL, TRUE);
if(result)
return result;
+
+ slashPos = strrchr(rawPath, '/');
+ if(slashPos) {
+ /* chop off the file part if format is dir/file otherwise remove
+ the trailing slash for dir/dir/ except for absolute path / */
+ size_t n = slashPos - rawPath;
+ if(n == 0)
+ ++n;
+
+ lstArg = rawPath;
+ lstArg[n] = '\0';
+ }
+ else
+ free(rawPath);
}
cmd = aprintf("%s%s%s",
@@ -1470,15 +1478,12 @@ static CURLcode ftp_state_list(struct connectdata *conn)
(data->set.ftp_list_only?"NLST":"LIST"),
lstArg? " ": "",
lstArg? lstArg: "");
+ free(lstArg);
- if(!cmd) {
- free(lstArg);
+ if(!cmd)
return CURLE_OUT_OF_MEMORY;
- }
result = Curl_pp_sendf(&conn->proto.ftpc.pp, "%s", cmd);
-
- free(lstArg);
free(cmd);
if(result)
@@ -3132,8 +3137,8 @@ static CURLcode ftp_done(struct connectdata *conn, CURLcode status,
ssize_t nread;
int ftpcode;
CURLcode result = CURLE_OK;
- char *path = NULL;
- size_t pathlen = 0;
+ char *rawPath = NULL;
+ size_t pathLen = 0;
if(!ftp)
return CURLE_OK;
@@ -3181,8 +3186,8 @@ static CURLcode ftp_done(struct connectdata *conn, CURLcode status,
}
if(!result)
- /* get the "raw" path */
- result = Curl_urldecode(data, ftp->path, 0, &path, &pathlen, TRUE);
+ /* get the url-decoded "raw" path */
+ result = Curl_urldecode(data, ftp->path, 0, &rawPath, &pathLen, TRUE);
if(result) {
/* We can limp along anyway (and should try to since we may already be in
* the error path) */
@@ -3192,22 +3197,22 @@ static CURLcode ftp_done(struct connectdata *conn, CURLcode status,
ftpc->prevpath = NULL; /* no path remembering */
}
else { /* remember working directory for connection reuse */
- if((data->set.ftp_filemethod == FTPFILE_NOCWD) && (path[0] == '/'))
- free(path); /* full path => no CWDs happened => keep ftpc->prevpath */
+ if((data->set.ftp_filemethod == FTPFILE_NOCWD) && (rawPath[0] == '/'))
+ free(rawPath); /* full path => no CWDs happened => keep ftpc->prevpath */
else {
free(ftpc->prevpath);
if(!ftpc->cwdfail) {
if(data->set.ftp_filemethod == FTPFILE_NOCWD)
- pathlen = 0; /* relative path => working directory is FTP home */
+ pathLen = 0; /* relative path => working directory is FTP home */
else
- pathlen -= ftpc->file?strlen(ftpc->file):0; /* file is url-decoded */
+ pathLen -= ftpc->file?strlen(ftpc->file):0; /* file is url-decoded */
- path[pathlen] = '\0';
- ftpc->prevpath = path;
+ rawPath[pathLen] = '\0';
+ ftpc->prevpath = rawPath;
}
else {
- free(path);
+ free(rawPath);
ftpc->prevpath = NULL; /* no path */
}
}
@@ -4087,192 +4092,142 @@ CURLcode ftp_parse_url_path(struct connectdata *conn)
/* the ftp struct is already inited in ftp_connect() */
struct FTP *ftp = data->req.protop;
struct ftp_conn *ftpc = &conn->proto.ftpc;
- const char *slash_pos; /* position of the first '/' char in curpos */
- const char *path_to_use = ftp->path;
- const char *cur_pos;
- const char *filename = NULL;
- char *path = NULL;
- size_t pathlen = 0;
+ const char *slashPos = NULL;
+ const char *fileName = NULL;
CURLcode result = CURLE_OK;
-
- cur_pos = path_to_use; /* current position in path. point at the begin of
- next path component */
+ char *rawPath = NULL; /* url-decoded "raw" path */
+ size_t pathLen = 0;
ftpc->ctl_valid = FALSE;
ftpc->cwdfail = FALSE;
- switch(data->set.ftp_filemethod) {
- case FTPFILE_NOCWD:
- /* fastest, but less standard-compliant */
-
- /*
- The best time to check whether the path is a file or directory is right
- here. so:
+ /* url-decode ftp path before further evaluation */
+ result = Curl_urldecode(data, ftp->path, 0, &rawPath, &pathLen, TRUE);
+ if(result)
+ return result;
- the first condition in the if() right here, is there just in case
- someone decides to set path to NULL one day
- */
- if(path_to_use[0] &&
- (path_to_use[strlen(path_to_use) - 1] != '/') )
- filename = path_to_use; /* this is a full file path */
- /*
- else {
- ftpc->file is not used anywhere other than for operations on a file.
- In other words, never for directory operations.
- So we can safely leave filename as NULL here and use it as a
- argument in dir/file decisions.
- }
- */
- break;
+ switch(data->set.ftp_filemethod) {
+ case FTPFILE_NOCWD: /* fastest, but less standard-compliant */
- case FTPFILE_SINGLECWD:
- /* get the last slash */
- if(!path_to_use[0]) {
- /* no dir, no file */
- ftpc->dirdepth = 0;
+ if((pathLen > 0) && (rawPath[pathLen - 1] != '/'))
+ fileName = rawPath; /* this is a full file path */
+ /*
+ else: ftpc->file is not used anywhere other than for operations on
+ a file. In other words, never for directory operations.
+ So we can safely leave filename as NULL here and use it as a
+ argument in dir/file decisions.
+ */
break;
- }
- slash_pos = strrchr(cur_pos, '/');
- if(slash_pos || !*cur_pos) {
- size_t dirlen = slash_pos-cur_pos;
- ftpc->dirs = calloc(1, sizeof(ftpc->dirs[0]));
- if(!ftpc->dirs)
- return CURLE_OUT_OF_MEMORY;
+ case FTPFILE_SINGLECWD:
+ slashPos = strrchr(rawPath, '/');
+ if(slashPos) {
+ /* get path before last slash, except for / */
+ size_t dirlen = slashPos - rawPath;
+ if(dirlen == 0)
+ dirlen++;
+
+ ftpc->dirs = calloc(1, sizeof(ftpc->dirs[0]));
+ if(!ftpc->dirs) {
+ free(rawPath);
+ return CURLE_OUT_OF_MEMORY;
+ }
- if(!dirlen)
- dirlen++;
+ ftpc->dirs[0] = calloc(1, dirlen + 1);
+ if(!ftpc->dirs[0]) {
+ free(rawPath);
+ return CURLE_OUT_OF_MEMORY;
+ }
- result = Curl_urldecode(conn->data, slash_pos ? cur_pos : "/",
- slash_pos ? dirlen : 1,
- &ftpc->dirs[0], NULL,
- TRUE);
- if(result) {
- freedirs(ftpc);
- return result;
+ strncpy(ftpc->dirs[0], rawPath, dirlen);
+ ftpc->dirdepth = 1; /* we consider it to be a single dir */
+ fileName = slashPos + 1; /* rest is file name */
}
- ftpc->dirdepth = 1; /* we consider it to be a single dir */
- filename = slash_pos ? slash_pos + 1 : cur_pos; /* rest is file name */
- }
- else
- filename = cur_pos; /* this is a file name only */
- break;
+ else
+ fileName = rawPath; /* file name only (or empty) */
+ break;
- default: /* allow pretty much anything */
- case FTPFILE_MULTICWD:
- ftpc->dirdepth = 0;
- ftpc->diralloc = 5; /* default dir depth to allocate */
- ftpc->dirs = calloc(ftpc->diralloc, sizeof(ftpc->dirs[0]));
- if(!ftpc->dirs)
- return CURLE_OUT_OF_MEMORY;
+ default: /* allow pretty much anything */
+ case FTPFILE_MULTICWD: {
+ /* current position: begin of next path component */
+ const char *curPos = rawPath;
+
+ int dirAlloc = 0; /* number of entries allocated for the 'dirs' array */
+ const char *str = rawPath;
+ for(; *str != 0; ++str)
+ if (*str == '/')
+ ++dirAlloc;
+
+ if(dirAlloc > 0) {
+ ftpc->dirs = calloc(dirAlloc, sizeof(ftpc->dirs[0]));
+ if(!ftpc->dirs) {
+ free(rawPath);
+ return CURLE_OUT_OF_MEMORY;
+ }
+
+ /* parse the URL path into separate path components */
+ while((slashPos = strchr(curPos, '/')) != NULL) {
+ size_t compLen = slashPos - curPos;
+
+ /* path starts with a slash: add that as a directory */
+ if((compLen == 0) && (ftpc->dirdepth == 0))
+ ++compLen;
- /* we have a special case for listing the root dir only */
- if(!strcmp(path_to_use, "/")) {
- cur_pos++; /* make it point to the zero byte */
- ftpc->dirs[0] = strdup("/");
- ftpc->dirdepth++;
- }
- else {
- /* parse the URL path into separate path components */
- while((slash_pos = strchr(cur_pos, '/')) != NULL) {
- /* 1 or 0 pointer offset to indicate absolute directory */
- ssize_t absolute_dir = ((cur_pos - ftp->path > 0) &&
- (ftpc->dirdepth == 0))?1:0;
-
- /* seek out the next path component */
- if(slash_pos-cur_pos) {
/* we skip empty path components, like "x//y" since the FTP command
CWD requires a parameter and a non-existent parameter a) doesn't
work on many servers and b) has no effect on the others. */
- size_t len = slash_pos - cur_pos + absolute_dir;
- result = Curl_urldecode(conn->data, cur_pos - absolute_dir, len,
- &ftpc->dirs[ftpc->dirdepth], NULL,
- TRUE);
- if(result) {
- freedirs(ftpc);
- return result;
- }
- }
- else {
- cur_pos = slash_pos + 1; /* jump to the rest of the string */
- if(!ftpc->dirdepth) {
- /* path starts with a slash, add that as a directory */
- ftpc->dirs[ftpc->dirdepth] = strdup("/");
- if(!ftpc->dirs[ftpc->dirdepth++]) { /* run out of memory ... */
- failf(data, "no memory");
- freedirs(ftpc);
+ if(compLen > 0) {
+ char *comp = calloc(1, compLen + 1);
+ if(!comp) {
+ free(rawPath);
return CURLE_OUT_OF_MEMORY;
}
+ strncpy(comp, curPos, compLen);
+ ftpc->dirs[ftpc->dirdepth++] = comp;
}
- continue;
- }
-
- cur_pos = slash_pos + 1; /* jump to the rest of the string */
- if(++ftpc->dirdepth >= ftpc->diralloc) {
- /* enlarge array */
- char **bigger;
- ftpc->diralloc *= 2; /* double the size each time */
- bigger = realloc(ftpc->dirs, ftpc->diralloc * sizeof(ftpc->dirs[0]));
- if(!bigger) {
- freedirs(ftpc);
- return CURLE_OUT_OF_MEMORY;
- }
- ftpc->dirs = bigger;
+ curPos = slashPos + 1;
}
}
+ DEBUGASSERT(ftpc->dirdepth <= dirAlloc);
+ fileName = curPos; /* the rest is the file name (or empty) */
}
- filename = cur_pos; /* the rest is the file name */
break;
} /* switch */
- if(filename && *filename) {
- result = Curl_urldecode(conn->data, filename, 0, &ftpc->file, NULL, TRUE);
-
- if(result) {
- freedirs(ftpc);
- return result;
- }
- }
+ if(fileName && *fileName)
+ ftpc->file = strdup(fileName);
else
- ftpc->file = NULL; /* instead of point to a zero byte, we make it a NULL
- pointer */
+ ftpc->file = NULL; /* instead of point to a zero byte,
+ we make it a NULL pointer */
if(data->set.upload && !ftpc->file && (ftp->transfer == FTPTRANSFER_BODY)) {
/* We need a file name when uploading. Return error! */
failf(data, "Uploading to a URL without a file name!");
+ free(rawPath);
return CURLE_URL_MALFORMAT;
}
ftpc->cwddone = FALSE; /* default to not done */
- /* prevpath and ftpc->file are url-decoded so convert the input path
- before we compare the strings */
- result = Curl_urldecode(conn->data, ftp->path, 0, &path, &pathlen, TRUE);
- if(result) {
- freedirs(ftpc);
- return result;
- }
-
- if((data->set.ftp_filemethod == FTPFILE_NOCWD) && (path[0] == '/'))
+ if((data->set.ftp_filemethod == FTPFILE_NOCWD) && (rawPath[0] == '/'))
ftpc->cwddone = TRUE; /* skip CWD for absolute paths */
else { /* newly created FTP connections are already in entry path */
- const char *oldpath = conn->bits.reuse ? ftpc->prevpath : "";
- if(oldpath) {
+ const char *oldPath = conn->bits.reuse ? ftpc->prevpath : "";
+ if(oldPath) {
+ size_t n = pathLen;
if(data->set.ftp_filemethod == FTPFILE_NOCWD)
- pathlen = 0; /* CWD to entry for relative paths */
+ n = 0; /* CWD to entry for relative paths */
else
- pathlen -= ftpc->file?strlen(ftpc->file):0;
-
- path[pathlen] = '\0';
+ n -= ftpc->file?strlen(ftpc->file):0;
- if(!strcmp(path, oldpath)) {
+ if((strlen(oldPath) == n) && !strncmp(rawPath, oldPath, n)) {
infof(data, "Request has same path as previous transfer\n");
ftpc->cwddone = TRUE;
}
}
}
- free(path);
+ free(rawPath);
return CURLE_OK;
}
diff --git a/lib/ftp.h b/lib/ftp.h
index 3bdf52031..2c88d568c 100644
--- a/lib/ftp.h
+++ b/lib/ftp.h
@@ -121,7 +121,6 @@ struct ftp_conn {
char *entrypath; /* the PWD reply when we logged on */
char **dirs; /* realloc()ed array for path components */
int dirdepth; /* number of entries used in the 'dirs' array */
- int diralloc; /* number of entries allocated for the 'dirs' array */
char *file; /* url-decoded file name (or path) */
bool dont_check; /* Set to TRUE to prevent the final (post-transfer)
file size and 226/250 status check. It should still