diff options
Diffstat (limited to 'contrib/adminpack/adminpack.c')
| -rw-r--r-- | contrib/adminpack/adminpack.c | 592 |
1 files changed, 592 insertions, 0 deletions
diff --git a/contrib/adminpack/adminpack.c b/contrib/adminpack/adminpack.c new file mode 100644 index 0000000..d064b5a --- /dev/null +++ b/contrib/adminpack/adminpack.c @@ -0,0 +1,592 @@ +/*------------------------------------------------------------------------- + * + * adminpack.c + * + * + * Copyright (c) 2002-2020, PostgreSQL Global Development Group + * + * Author: Andreas Pflug <pgadmin@pse-consulting.de> + * + * IDENTIFICATION + * contrib/adminpack/adminpack.c + * + *------------------------------------------------------------------------- + */ +#include "postgres.h" + +#include <sys/file.h> +#include <sys/stat.h> +#include <unistd.h> + +#include "catalog/pg_authid.h" +#include "catalog/pg_type.h" +#include "funcapi.h" +#include "miscadmin.h" +#include "postmaster/syslogger.h" +#include "storage/fd.h" +#include "utils/acl.h" +#include "utils/builtins.h" +#include "utils/datetime.h" + + +#ifdef WIN32 + +#ifdef rename +#undef rename +#endif + +#ifdef unlink +#undef unlink +#endif +#endif + +PG_MODULE_MAGIC; + +PG_FUNCTION_INFO_V1(pg_file_write); +PG_FUNCTION_INFO_V1(pg_file_write_v1_1); +PG_FUNCTION_INFO_V1(pg_file_sync); +PG_FUNCTION_INFO_V1(pg_file_rename); +PG_FUNCTION_INFO_V1(pg_file_rename_v1_1); +PG_FUNCTION_INFO_V1(pg_file_unlink); +PG_FUNCTION_INFO_V1(pg_file_unlink_v1_1); +PG_FUNCTION_INFO_V1(pg_logdir_ls); +PG_FUNCTION_INFO_V1(pg_logdir_ls_v1_1); + +static int64 pg_file_write_internal(text *file, text *data, bool replace); +static bool pg_file_rename_internal(text *file1, text *file2, text *file3); +static Datum pg_logdir_ls_internal(FunctionCallInfo fcinfo); + + +/*----------------------- + * some helper functions + */ + +/* + * Convert a "text" filename argument to C string, and check it's allowable. + * + * Filename may be absolute or relative to the DataDir, but we only allow + * absolute paths that match DataDir. + */ +static char * +convert_and_check_filename(text *arg) +{ + char *filename = text_to_cstring(arg); + + canonicalize_path(filename); /* filename can change length here */ + + /* + * Members of the 'pg_write_server_files' role are allowed to access any + * files on the server as the PG user, so no need to do any further checks + * here. + */ + if (is_member_of_role(GetUserId(), DEFAULT_ROLE_WRITE_SERVER_FILES)) + return filename; + + /* User isn't a member of the default role, so check if it's allowable */ + if (is_absolute_path(filename)) + { + /* Disallow '/a/b/data/..' */ + if (path_contains_parent_reference(filename)) + ereport(ERROR, + (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE), + errmsg("reference to parent directory (\"..\") not allowed"))); + + /* Allow absolute paths if within DataDir */ + if (!path_is_prefix_of_path(DataDir, filename)) + ereport(ERROR, + (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE), + errmsg("absolute path not allowed"))); + } + else if (!path_is_relative_and_below_cwd(filename)) + ereport(ERROR, + (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE), + errmsg("path must be in or below the current directory"))); + + return filename; +} + + +/* + * check for superuser, bark if not. + */ +static void +requireSuperuser(void) +{ + if (!superuser()) + ereport(ERROR, + (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE), + errmsg("only superuser may access generic file functions"))); +} + + + +/* ------------------------------------ + * pg_file_write - old version + * + * The superuser() check here must be kept as the library might be upgraded + * without the extension being upgraded, meaning that in pre-1.1 installations + * these functions could be called by any user. + */ +Datum +pg_file_write(PG_FUNCTION_ARGS) +{ + text *file = PG_GETARG_TEXT_PP(0); + text *data = PG_GETARG_TEXT_PP(1); + bool replace = PG_GETARG_BOOL(2); + int64 count = 0; + + requireSuperuser(); + + count = pg_file_write_internal(file, data, replace); + + PG_RETURN_INT64(count); +} + +/* ------------------------------------ + * pg_file_write_v1_1 - Version 1.1 + * + * As of adminpack version 1.1, we no longer need to check if the user + * is a superuser because we REVOKE EXECUTE on the function from PUBLIC. + * Users can then grant access to it based on their policies. + * + * Otherwise identical to pg_file_write (above). + */ +Datum +pg_file_write_v1_1(PG_FUNCTION_ARGS) +{ + text *file = PG_GETARG_TEXT_PP(0); + text *data = PG_GETARG_TEXT_PP(1); + bool replace = PG_GETARG_BOOL(2); + int64 count = 0; + + count = pg_file_write_internal(file, data, replace); + + PG_RETURN_INT64(count); +} + +/* ------------------------------------ + * pg_file_write_internal - Workhorse for pg_file_write functions. + * + * This handles the actual work for pg_file_write. + */ +static int64 +pg_file_write_internal(text *file, text *data, bool replace) +{ + FILE *f; + char *filename; + int64 count = 0; + + filename = convert_and_check_filename(file); + + if (!replace) + { + struct stat fst; + + if (stat(filename, &fst) >= 0) + ereport(ERROR, + (errcode(ERRCODE_DUPLICATE_FILE), + errmsg("file \"%s\" exists", filename))); + + f = AllocateFile(filename, "wb"); + } + else + f = AllocateFile(filename, "ab"); + + if (!f) + ereport(ERROR, + (errcode_for_file_access(), + errmsg("could not open file \"%s\" for writing: %m", + filename))); + + count = fwrite(VARDATA_ANY(data), 1, VARSIZE_ANY_EXHDR(data), f); + if (count != VARSIZE_ANY_EXHDR(data) || FreeFile(f)) + ereport(ERROR, + (errcode_for_file_access(), + errmsg("could not write file \"%s\": %m", filename))); + + return (count); +} + +/* ------------------------------------ + * pg_file_sync + * + * We REVOKE EXECUTE on the function from PUBLIC. + * Users can then grant access to it based on their policies. + */ +Datum +pg_file_sync(PG_FUNCTION_ARGS) +{ + char *filename; + struct stat fst; + + filename = convert_and_check_filename(PG_GETARG_TEXT_PP(0)); + + if (stat(filename, &fst) < 0) + ereport(ERROR, + (errcode_for_file_access(), + errmsg("could not stat file \"%s\": %m", filename))); + + fsync_fname_ext(filename, S_ISDIR(fst.st_mode), false, ERROR); + + PG_RETURN_VOID(); +} + +/* ------------------------------------ + * pg_file_rename - old version + * + * The superuser() check here must be kept as the library might be upgraded + * without the extension being upgraded, meaning that in pre-1.1 installations + * these functions could be called by any user. + */ +Datum +pg_file_rename(PG_FUNCTION_ARGS) +{ + text *file1; + text *file2; + text *file3; + bool result; + + requireSuperuser(); + + if (PG_ARGISNULL(0) || PG_ARGISNULL(1)) + PG_RETURN_NULL(); + + file1 = PG_GETARG_TEXT_PP(0); + file2 = PG_GETARG_TEXT_PP(1); + + if (PG_ARGISNULL(2)) + file3 = NULL; + else + file3 = PG_GETARG_TEXT_PP(2); + + result = pg_file_rename_internal(file1, file2, file3); + + PG_RETURN_BOOL(result); +} + +/* ------------------------------------ + * pg_file_rename_v1_1 - Version 1.1 + * + * As of adminpack version 1.1, we no longer need to check if the user + * is a superuser because we REVOKE EXECUTE on the function from PUBLIC. + * Users can then grant access to it based on their policies. + * + * Otherwise identical to pg_file_write (above). + */ +Datum +pg_file_rename_v1_1(PG_FUNCTION_ARGS) +{ + text *file1; + text *file2; + text *file3; + bool result; + + if (PG_ARGISNULL(0) || PG_ARGISNULL(1)) + PG_RETURN_NULL(); + + file1 = PG_GETARG_TEXT_PP(0); + file2 = PG_GETARG_TEXT_PP(1); + + if (PG_ARGISNULL(2)) + file3 = NULL; + else + file3 = PG_GETARG_TEXT_PP(2); + + result = pg_file_rename_internal(file1, file2, file3); + + PG_RETURN_BOOL(result); +} + +/* ------------------------------------ + * pg_file_rename_internal - Workhorse for pg_file_rename functions. + * + * This handles the actual work for pg_file_rename. + */ +static bool +pg_file_rename_internal(text *file1, text *file2, text *file3) +{ + char *fn1, + *fn2, + *fn3; + int rc; + + fn1 = convert_and_check_filename(file1); + fn2 = convert_and_check_filename(file2); + + if (file3 == NULL) + fn3 = NULL; + else + fn3 = convert_and_check_filename(file3); + + if (access(fn1, W_OK) < 0) + { + ereport(WARNING, + (errcode_for_file_access(), + errmsg("file \"%s\" is not accessible: %m", fn1))); + + return false; + } + + if (fn3 && access(fn2, W_OK) < 0) + { + ereport(WARNING, + (errcode_for_file_access(), + errmsg("file \"%s\" is not accessible: %m", fn2))); + + return false; + } + + rc = access(fn3 ? fn3 : fn2, W_OK); + if (rc >= 0 || errno != ENOENT) + { + ereport(ERROR, + (errcode(ERRCODE_DUPLICATE_FILE), + errmsg("cannot rename to target file \"%s\"", + fn3 ? fn3 : fn2))); + } + + if (fn3) + { + if (rename(fn2, fn3) != 0) + { + ereport(ERROR, + (errcode_for_file_access(), + errmsg("could not rename \"%s\" to \"%s\": %m", + fn2, fn3))); + } + if (rename(fn1, fn2) != 0) + { + ereport(WARNING, + (errcode_for_file_access(), + errmsg("could not rename \"%s\" to \"%s\": %m", + fn1, fn2))); + + if (rename(fn3, fn2) != 0) + { + ereport(ERROR, + (errcode_for_file_access(), + errmsg("could not rename \"%s\" back to \"%s\": %m", + fn3, fn2))); + } + else + { + ereport(ERROR, + (errcode(ERRCODE_UNDEFINED_FILE), + errmsg("renaming \"%s\" to \"%s\" was reverted", + fn2, fn3))); + } + } + } + else if (rename(fn1, fn2) != 0) + { + ereport(ERROR, + (errcode_for_file_access(), + errmsg("could not rename \"%s\" to \"%s\": %m", fn1, fn2))); + } + + return true; +} + + +/* ------------------------------------ + * pg_file_unlink - old version + * + * The superuser() check here must be kept as the library might be upgraded + * without the extension being upgraded, meaning that in pre-1.1 installations + * these functions could be called by any user. + */ +Datum +pg_file_unlink(PG_FUNCTION_ARGS) +{ + char *filename; + + requireSuperuser(); + + filename = convert_and_check_filename(PG_GETARG_TEXT_PP(0)); + + if (access(filename, W_OK) < 0) + { + if (errno == ENOENT) + PG_RETURN_BOOL(false); + else + ereport(ERROR, + (errcode_for_file_access(), + errmsg("file \"%s\" is not accessible: %m", filename))); + } + + if (unlink(filename) < 0) + { + ereport(WARNING, + (errcode_for_file_access(), + errmsg("could not unlink file \"%s\": %m", filename))); + + PG_RETURN_BOOL(false); + } + PG_RETURN_BOOL(true); +} + + +/* ------------------------------------ + * pg_file_unlink_v1_1 - Version 1.1 + * + * As of adminpack version 1.1, we no longer need to check if the user + * is a superuser because we REVOKE EXECUTE on the function from PUBLIC. + * Users can then grant access to it based on their policies. + * + * Otherwise identical to pg_file_unlink (above). + */ +Datum +pg_file_unlink_v1_1(PG_FUNCTION_ARGS) +{ + char *filename; + + filename = convert_and_check_filename(PG_GETARG_TEXT_PP(0)); + + if (access(filename, W_OK) < 0) + { + if (errno == ENOENT) + PG_RETURN_BOOL(false); + else + ereport(ERROR, + (errcode_for_file_access(), + errmsg("file \"%s\" is not accessible: %m", filename))); + } + + if (unlink(filename) < 0) + { + ereport(WARNING, + (errcode_for_file_access(), + errmsg("could not unlink file \"%s\": %m", filename))); + + PG_RETURN_BOOL(false); + } + PG_RETURN_BOOL(true); +} + +/* ------------------------------------ + * pg_logdir_ls - Old version + * + * The superuser() check here must be kept as the library might be upgraded + * without the extension being upgraded, meaning that in pre-1.1 installations + * these functions could be called by any user. + */ +Datum +pg_logdir_ls(PG_FUNCTION_ARGS) +{ + if (!superuser()) + ereport(ERROR, + (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE), + errmsg("only superuser can list the log directory"))); + + return (pg_logdir_ls_internal(fcinfo)); +} + +/* ------------------------------------ + * pg_logdir_ls_v1_1 - Version 1.1 + * + * As of adminpack version 1.1, we no longer need to check if the user + * is a superuser because we REVOKE EXECUTE on the function from PUBLIC. + * Users can then grant access to it based on their policies. + * + * Otherwise identical to pg_logdir_ls (above). + */ +Datum +pg_logdir_ls_v1_1(PG_FUNCTION_ARGS) +{ + return (pg_logdir_ls_internal(fcinfo)); +} + +static Datum +pg_logdir_ls_internal(FunctionCallInfo fcinfo) +{ + ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo; + bool randomAccess; + TupleDesc tupdesc; + Tuplestorestate *tupstore; + AttInMetadata *attinmeta; + DIR *dirdesc; + struct dirent *de; + MemoryContext oldcontext; + + if (strcmp(Log_filename, "postgresql-%Y-%m-%d_%H%M%S.log") != 0) + ereport(ERROR, + (errcode(ERRCODE_INVALID_PARAMETER_VALUE), + errmsg("the log_filename parameter must equal 'postgresql-%%Y-%%m-%%d_%%H%%M%%S.log'"))); + + /* check to see if caller supports us returning a tuplestore */ + if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo)) + ereport(ERROR, + (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), + errmsg("set-valued function called in context that cannot accept a set"))); + if (!(rsinfo->allowedModes & SFRM_Materialize)) + ereport(ERROR, + (errcode(ERRCODE_SYNTAX_ERROR), + errmsg("materialize mode required, but it is not allowed in this context"))); + + /* The tupdesc and tuplestore must be created in ecxt_per_query_memory */ + oldcontext = MemoryContextSwitchTo(rsinfo->econtext->ecxt_per_query_memory); + + tupdesc = CreateTemplateTupleDesc(2); + TupleDescInitEntry(tupdesc, (AttrNumber) 1, "starttime", + TIMESTAMPOID, -1, 0); + TupleDescInitEntry(tupdesc, (AttrNumber) 2, "filename", + TEXTOID, -1, 0); + + randomAccess = (rsinfo->allowedModes & SFRM_Materialize_Random) != 0; + tupstore = tuplestore_begin_heap(randomAccess, false, work_mem); + rsinfo->returnMode = SFRM_Materialize; + rsinfo->setResult = tupstore; + rsinfo->setDesc = tupdesc; + + MemoryContextSwitchTo(oldcontext); + + attinmeta = TupleDescGetAttInMetadata(tupdesc); + + dirdesc = AllocateDir(Log_directory); + while ((de = ReadDir(dirdesc, Log_directory)) != NULL) + { + char *values[2]; + HeapTuple tuple; + char timestampbuf[32]; + char *field[MAXDATEFIELDS]; + char lowstr[MAXDATELEN + 1]; + int dtype; + int nf, + ftype[MAXDATEFIELDS]; + fsec_t fsec; + int tz = 0; + struct pg_tm date; + + /* + * Default format: postgresql-YYYY-MM-DD_HHMMSS.log + */ + if (strlen(de->d_name) != 32 + || strncmp(de->d_name, "postgresql-", 11) != 0 + || de->d_name[21] != '_' + || strcmp(de->d_name + 28, ".log") != 0) + continue; + + /* extract timestamp portion of filename */ + strcpy(timestampbuf, de->d_name + 11); + timestampbuf[17] = '\0'; + + /* parse and decode expected timestamp to verify it's OK format */ + if (ParseDateTime(timestampbuf, lowstr, MAXDATELEN, field, ftype, MAXDATEFIELDS, &nf)) + continue; + + if (DecodeDateTime(field, ftype, nf, &dtype, &date, &fsec, &tz)) + continue; + + /* Seems the timestamp is OK; prepare and return tuple */ + + values[0] = timestampbuf; + values[1] = psprintf("%s/%s", Log_directory, de->d_name); + + tuple = BuildTupleFromCStrings(attinmeta, values); + + tuplestore_puttuple(tupstore, tuple); + } + + FreeDir(dirdesc); + return (Datum) 0; +} |