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Commit74686b6

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committed
Get rid of some unnecessary dependencies on DataDir: wherever possible,
the backend should rely on its working-directory setting instead.Also do some message-style police work in contrib/adminpack.
1 parent62fe410 commit74686b6

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3 files changed

+83
-102
lines changed

3 files changed

+83
-102
lines changed

‎contrib/adminpack/adminpack.c

Lines changed: 56 additions & 58 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
* Author: Andreas Pflug <pgadmin@pse-consulting.de>
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/contrib/adminpack/adminpack.c,v 1.7 2006/10/20 00:59:03 tgl Exp $
11+
* $PostgreSQL: pgsql/contrib/adminpack/adminpack.c,v 1.8 2006/11/06 03:06:40 tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -60,43 +60,47 @@ typedef struct
6060
*/
6161

6262
/*
63-
* Return an absolute path. Argument may be absolute or
64-
* relative to the DataDir.
63+
* Convert a "text" filename argument to C string, and check it's allowable.
64+
*
65+
* Filename may be absolute or relative to the DataDir, but we only allow
66+
* absolute paths that match DataDir or Log_directory.
6567
*/
6668
staticchar*
67-
absClusterPath(text*arg,boollogAllowed)
69+
convert_and_check_filename(text*arg,boollogAllowed)
6870
{
69-
char*filename;
70-
intlen=VARSIZE(arg)-VARHDRSZ;
71-
intdlen=strlen(DataDir);
71+
intinput_len=VARSIZE(arg)-VARHDRSZ;
72+
char*filename=palloc(input_len+1);
73+
74+
memcpy(filename,VARDATA(arg),input_len);
75+
filename[input_len]='\0';
7276

73-
filename=palloc(len+1);
74-
memcpy(filename,VARDATA(arg),len);
75-
filename[len]=0;
77+
canonicalize_path(filename);/* filename can change length here */
7678

77-
if (strstr(filename,"..")!=NULL)
79+
/* Disallow ".." in the path */
80+
if (path_contains_parent_reference(filename))
7881
ereport(ERROR,
7982
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
80-
(errmsg("No .. allowed in filenames"))));
83+
(errmsg("reference to parent directory (\"..\") not allowed"))));
8184

8285
if (is_absolute_path(filename))
8386
{
84-
if (logAllowed&& !strncmp(filename,Log_directory,strlen(Log_directory)))
87+
/* Allow absolute references within DataDir */
88+
if (path_is_prefix_of_path(DataDir,filename))
89+
returnfilename;
90+
/* The log directory might be outside our datadir, but allow it */
91+
if (logAllowed&&
92+
is_absolute_path(Log_directory)&&
93+
path_is_prefix_of_path(Log_directory,filename))
8594
returnfilename;
86-
if (strncmp(filename,DataDir,dlen))
87-
ereport(ERROR,
88-
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
89-
(errmsg("Absolute path not allowed"))));
9095

91-
returnfilename;
96+
ereport(ERROR,
97+
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
98+
(errmsg("absolute path not allowed"))));
99+
returnNULL;/* keep compiler quiet */
92100
}
93101
else
94102
{
95-
char*absname=palloc(dlen+len+2);
96-
97-
sprintf(absname,"%s/%s",DataDir,filename);
98-
pfree(filename);
99-
returnabsname;
103+
returnfilename;
100104
}
101105
}
102106

@@ -129,29 +133,28 @@ pg_file_write(PG_FUNCTION_ARGS)
129133

130134
requireSuperuser();
131135

132-
filename=absClusterPath(PG_GETARG_TEXT_P(0), false);
136+
filename=convert_and_check_filename(PG_GETARG_TEXT_P(0), false);
133137
data=PG_GETARG_TEXT_P(1);
134138

135-
if (PG_ARGISNULL(2)||!PG_GETARG_BOOL(2))
139+
if (!PG_GETARG_BOOL(2))
136140
{
137141
structstatfst;
138142

139143
if (stat(filename,&fst) >=0)
140144
ereport(ERROR,
141145
(ERRCODE_DUPLICATE_FILE,
142-
errmsg("file%s exists",filename)));
146+
errmsg("file\"%s\" exists",filename)));
143147

144148
f=fopen(filename,"wb");
145149
}
146150
else
147151
f=fopen(filename,"ab");
148152

149153
if (!f)
150-
{
151154
ereport(ERROR,
152155
(errcode_for_file_access(),
153-
errmsg("could open file%s for writing: %m",filename)));
154-
}
156+
errmsg("couldnotopen file\"%s\" for writing: %m",
157+
filename)));
155158

156159
if (VARSIZE(data)!=0)
157160
{
@@ -160,7 +163,7 @@ pg_file_write(PG_FUNCTION_ARGS)
160163
if (count!=VARSIZE(data)-VARHDRSZ)
161164
ereport(ERROR,
162165
(errcode_for_file_access(),
163-
errmsg("error writingfile%s: %m",filename)));
166+
errmsg("could not writefile\"%s\": %m",filename)));
164167
}
165168
fclose(f);
166169

@@ -181,18 +184,18 @@ pg_file_rename(PG_FUNCTION_ARGS)
181184
if (PG_ARGISNULL(0)||PG_ARGISNULL(1))
182185
PG_RETURN_NULL();
183186

184-
fn1=absClusterPath(PG_GETARG_TEXT_P(0), false);
185-
fn2=absClusterPath(PG_GETARG_TEXT_P(1), false);
187+
fn1=convert_and_check_filename(PG_GETARG_TEXT_P(0), false);
188+
fn2=convert_and_check_filename(PG_GETARG_TEXT_P(1), false);
186189
if (PG_ARGISNULL(2))
187190
fn3=0;
188191
else
189-
fn3=absClusterPath(PG_GETARG_TEXT_P(2), false);
192+
fn3=convert_and_check_filename(PG_GETARG_TEXT_P(2), false);
190193

191194
if (access(fn1,W_OK)<0)
192195
{
193196
ereport(WARNING,
194197
(errcode_for_file_access(),
195-
errmsg("file%s not accessible: %m",fn1)));
198+
errmsg("file\"%s\" is not accessible: %m",fn1)));
196199

197200
PG_RETURN_BOOL(false);
198201
}
@@ -201,18 +204,18 @@ pg_file_rename(PG_FUNCTION_ARGS)
201204
{
202205
ereport(WARNING,
203206
(errcode_for_file_access(),
204-
errmsg("file%s not accessible: %m",fn2)));
207+
errmsg("file\"%s\" is not accessible: %m",fn2)));
205208

206209
PG_RETURN_BOOL(false);
207210
}
208211

209-
210212
rc=access(fn3 ?fn3 :fn2,2);
211213
if (rc >=0||errno!=ENOENT)
212214
{
213215
ereport(ERROR,
214216
(ERRCODE_DUPLICATE_FILE,
215-
errmsg("cannot rename to target file %s",fn3 ?fn3 :fn2)));
217+
errmsg("cannot rename to target file \"%s\"",
218+
fn3 ?fn3 :fn2)));
216219
}
217220

218221
if (fn3)
@@ -221,37 +224,37 @@ pg_file_rename(PG_FUNCTION_ARGS)
221224
{
222225
ereport(ERROR,
223226
(errcode_for_file_access(),
224-
errmsg("could not rename %s to %s: %m",fn2,fn3)));
227+
errmsg("could not rename \"%s\" to \"%s\": %m",
228+
fn2,fn3)));
225229
}
226230
if (rename(fn1,fn2)!=0)
227231
{
228232
ereport(WARNING,
229233
(errcode_for_file_access(),
230-
errmsg("could not rename %s to %s: %m",fn1,fn2)));
234+
errmsg("could not rename \"%s\" to \"%s\": %m",
235+
fn1,fn2)));
231236

232237
if (rename(fn3,fn2)!=0)
233238
{
234239
ereport(ERROR,
235240
(errcode_for_file_access(),
236-
errmsg("could not rename %s back to %s: %m",fn3,fn2)));
241+
errmsg("could not rename \"%s\" back to \"%s\": %m",
242+
fn3,fn2)));
237243
}
238244
else
239245
{
240246
ereport(ERROR,
241247
(ERRCODE_UNDEFINED_FILE,
242-
errmsg("renaming%s to%s was reverted",fn2,fn3)));
243-
248+
errmsg("renaming\"%s\" to\"%s\" was reverted",
249+
fn2,fn3)));
244250
}
245251
}
246252
}
247253
elseif (rename(fn1,fn2)!=0)
248254
{
249-
ereport(WARNING,
250-
(errcode_for_file_access(),
251-
errmsg("renaming %s to %s %m",fn1,fn2)));
252255
ereport(ERROR,
253256
(errcode_for_file_access(),
254-
errmsg("could not rename%s to%s: %m",fn1,fn2)));
257+
errmsg("could not rename\"%s\" to\"%s\": %m",fn1,fn2)));
255258
}
256259

257260
PG_RETURN_BOOL(true);
@@ -265,7 +268,7 @@ pg_file_unlink(PG_FUNCTION_ARGS)
265268

266269
requireSuperuser();
267270

268-
filename=absClusterPath(PG_GETARG_TEXT_P(0), false);
271+
filename=convert_and_check_filename(PG_GETARG_TEXT_P(0), false);
269272

270273
if (access(filename,W_OK)<0)
271274
{
@@ -274,15 +277,14 @@ pg_file_unlink(PG_FUNCTION_ARGS)
274277
else
275278
ereport(ERROR,
276279
(errcode_for_file_access(),
277-
errmsg("file %s not accessible: %m",filename)));
278-
280+
errmsg("file \"%s\" is not accessible: %m",filename)));
279281
}
280282

281283
if (unlink(filename)<0)
282284
{
283285
ereport(WARNING,
284286
(errcode_for_file_access(),
285-
errmsg("could not unlink file%s: %m",filename)));
287+
errmsg("could not unlink file\"%s\": %m",filename)));
286288

287289
PG_RETURN_BOOL(false);
288290
}
@@ -316,13 +318,7 @@ pg_logdir_ls(PG_FUNCTION_ARGS)
316318
oldcontext=MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
317319

318320
fctx=palloc(sizeof(directory_fctx));
319-
if (is_absolute_path(Log_directory))
320-
fctx->location=pstrdup(Log_directory);
321-
else
322-
{
323-
fctx->location=palloc(strlen(DataDir)+strlen(Log_directory)+2);
324-
sprintf(fctx->location,"%s/%s",DataDir,Log_directory);
325-
}
321+
326322
tupdesc=CreateTemplateTupleDesc(2, false);
327323
TupleDescInitEntry(tupdesc, (AttrNumber)1,"starttime",
328324
TIMESTAMPOID,-1,0);
@@ -331,12 +327,14 @@ pg_logdir_ls(PG_FUNCTION_ARGS)
331327

332328
funcctx->attinmeta=TupleDescGetAttInMetadata(tupdesc);
333329

330+
fctx->location=pstrdup(Log_directory);
334331
fctx->dirdesc=AllocateDir(fctx->location);
335332

336333
if (!fctx->dirdesc)
337334
ereport(ERROR,
338335
(errcode_for_file_access(),
339-
errmsg("%s is not browsable: %m",fctx->location)));
336+
errmsg("could not read directory \"%s\": %m",
337+
fctx->location)));
340338

341339
funcctx->user_fctx=fctx;
342340
MemoryContextSwitchTo(oldcontext);

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