📄 audit.tcl
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## Run this Tcl script to generate the audit.html file.#set rcsid {$Id: audit.tcl,v 1.1 2002/07/13 16:52:35 drh Exp $}puts {<html><head> <title>SQLite Security Audit Procedure</title></head><body bgcolor=white><h1 align=center>SQLite Security Audit Procedure</h1>}puts "<p align=center>(This page was last modified on [lrange $rcsid 3 4] UTC)</p>"puts {<p>A security audit for SQLite consists of two components. First, there isa check for common errors that often lead to security problems. Second,an attempt is made to construct a proof that SQLite has certain desirablesecurity properties.</p><h2>Part I: Things to check</h2><p>Scan all source code and check for the following common errors:</p><ol><li><p>Verify that the destination buffer is large enough to hold its resultin every call to the following routines:<ul><li> <b>strcpy()</b> </li><li> <b>strncpy()</b> </li><li> <b>strcat()</b> </li><li> <b>memcpy()</b> </li><li> <b>memset()</b> </li><li> <b>memmove()</b> </li><li> <b>bcopy()</b> </li><li> <b>sprintf()</b> </li><li> <b>scanf()</b> </li></ul></p></li><li><p>Verify that pointers returned by subroutines are not NULL before usingthe pointers. In particular, make sure the return values for the followingroutines are checked before they are used:<ul><li> <b>malloc()</b> </li><li> <b>realloc()</b> </li><li> <b>sqliteMalloc()</b> </li><li> <b>sqliteRealloc()</b> </li><li> <b>sqliteStrDup()</b> </li><li> <b>sqliteStrNDup()</b> </li><li> <b>sqliteExpr()</b> </li><li> <b>sqliteExprFunction()</b> </li><li> <b>sqliteExprListAppend()</b> </li><li> <b>sqliteResultSetOfSelect()</b> </li><li> <b>sqliteIdListAppend()</b> </li><li> <b>sqliteSrcListAppend()</b> </li><li> <b>sqliteSelectNew()</b> </li><li> <b>sqliteTableNameToTable()</b> </li><li> <b>sqliteTableTokenToSrcList()</b> </li><li> <b>sqliteWhereBegin()</b> </li><li> <b>sqliteFindTable()</b> </li><li> <b>sqliteFindIndex()</b> </li><li> <b>sqliteTableNameFromToken()</b> </li><li> <b>sqliteGetVdbe()</b> </li><li> <b>sqlite_mprintf()</b> </li><li> <b>sqliteExprDup()</b> </li><li> <b>sqliteExprListDup()</b> </li><li> <b>sqliteSrcListDup()</b> </li><li> <b>sqliteIdListDup()</b> </li><li> <b>sqliteSelectDup()</b> </li><li> <b>sqliteFindFunction()</b> </li><li> <b>sqliteTriggerSelectStep()</b> </li><li> <b>sqliteTriggerInsertStep()</b> </li><li> <b>sqliteTriggerUpdateStep()</b> </li><li> <b>sqliteTriggerDeleteStep()</b> </li></ul></p></li><li><p>On all functions and procedures, verify that pointer parameters are not NULLbefore dereferencing those parameters.</p></li><li><p>Check to make sure that temporary files are opened safely: that the processwill not overwrite an existing file when opening the temp file and thatanother process is unable to substitute a file for the temp file beingopened.</p></li></ol><h2>Part II: Things to prove</h2><p>Prove that SQLite exhibits the characteristics outlined below:</p><ol><li><p>The following are preconditions:</p><p><ul><li><b>Z</b> is an arbitrary-length NUL-terminated string.</li><li>An existing SQLite database has been opened. The return value from the call to <b>sqlite_open()</b> is stored in the variable <b>db</b>.</li><li>The database contains at least one table of the form:<blockquote><pre>CREATE TABLE t1(a CLOB);</pre></blockquote></li><li>There are no user-defined functions other than the standard build-in functions.</li></ul></p><p>The following statement of C code is executed:</p><blockquote><pre>sqlite_exec_printf( db, "INSERT INTO t1(a) VALUES('%q');", 0, 0, 0, Z);</pre></blockquote><p>Prove the following are true for all possible values of string <b>Z</b>:</p><ol type="a"><li><p>The call to <b>sqlite_exec_printf()</b> willreturn in a length of time that is a polynomial in <b>strlen(Z)</b>.It might return an error code but it will not crash.</p></li><li><p>At most one new row will be inserted into table t1.</p></li><li><p>No preexisting rows of t1 will be deleted or modified.</p></li><li><p>No tables other than t1 will be altered in any way.</p></li><li><p>No preexisting files on the host computers filesystem, other thanthe database file itself, will be deleted or modified.</p></li><li><p>For some constants <b>K1</b> and <b>K2</b>,if at least <b>K1*strlen(Z) + K2</b> bytes of contiguous memory areavailable to <b>malloc()</b>, then the call to <b>sqlite_exec_printf()</b>will not return SQLITE_NOMEM.</p></li></ol></p></li><li><p>The following are preconditions:<p><ul><li><b>Z</b> is an arbitrary-length NUL-terminated string.</li><li>An existing SQLite database has been opened. The return value from the call to <b>sqlite_open()</b> is stored in the variable <b>db</b>.</li><li>There exists a callback function <b>cb()</b> that appends all information passed in through its parameters into a single data buffer called <b>Y</b>.</li><li>There are no user-defined functions other than the standard build-in functions.</li></ul></p><p>The following statement of C code is executed:</p><blockquote><pre>sqlite_exec(db, Z, cb, 0, 0);</pre></blockquote><p>Prove the following are true for all possible values of string <b>Z</b>:</p><ol type="a"><li><p>The call to <b>sqlite_exec()</b> willreturn in a length of time which is a polynomial in <b>strlen(Z)</b>.It might return an error code but it will not crash.</p></li><li><p>After <b>sqlite_exec()</b> returns, the buffer <b>Y</b> will not containany content from any preexisting file on the host computers file system,except for the database file.</p></li><li><p>After the call to <b>sqlite_exec()</b> returns, the database file willstill be well-formed. It might not contain the same data, but it willstill be a properly constructed SQLite database file.</p></li><li><p>No preexisting files on the host computers filesystem, other thanthe database file itself, will be deleted or modified.</p></li><li><p>For some constants <b>K1</b> and <b>K2</b>,if at least <b>K1*strlen(Z) + K2</b> bytes of contiguous memory areavailable to <b>malloc()</b>, then the call to <b>sqlite_exec()</b>will not return SQLITE_NOMEM.</p></li></ol></p></li></ol>}puts {<p><hr /></p><p><a href="index.html"><img src="/goback.jpg" border=0 />Back to the SQLite Home Page</a></p></body></html>}⌨️ 快捷键说明
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