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sphinx
CVE-2020-29050.patch
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File CVE-2020-29050.patch of Package sphinx
From 17245f7dd75d47c7365797b3d5feba8976367c6e Mon Sep 17 00:00:00 2001 From: klirichek <alexey@manticoresearch.com> Date: Tue, 2 Jul 2019 19:06:09 +0700 Subject: [PATCH] Fix random file reading by scattered snippets Issue was that load_files_scattered option just concatenated prefix with given name and then opened the file. So, if you provide something like '/etc/password' as file, or '../../../etc/passwd' even with non-zero prefix, it will unfortunately work. After this commit such behavior possible ONLY if user explicitly set `snippets_file_prefix` to empty string or '/'; another cases will not cause uncontroled reading. That fixes #866. [basilgello: Back-port to 2.2.11: - Refactor sphNormalizePath to use only available classes. - Do not use 'g_sSnippetsFilePrefix' in src/sphinxexcerpt.h, use 'tOptions.m_sFilePrefix' instead, as for 2.2.11, all two instances are assigned to 'g_sSnippetsFilePrefix'. - Adjust context. ] The following test passes, adapted from commit 66b5761ad258c60b1866a8e1333f86e74f48035 at https://github.com/manticoresoftware/manticoresearch : ==== /* cd test && g++ -o test test.cpp -I../src -I../config -I/usr/include/postgresql \ -I/usr/include/mariadb -DHAVE_CONFIG_H -L../src -lsphinx -pthread \ -lm -ldl -lstemmer -lmariadb -lpq -lexpat -lz */ void ASSERT_STREQ(const char *src, const char *dst) { auto normalized = sphNormalizePath(src); if (!strcmp(dst, normalized.scstr())) { auto _src = src; auto _dst = dst; if (src == nullptr) _src = "nullptr"; if (dst == nullptr) _dst = "nullptr"; std::cout << "OK : '" << _src << "' = '" << _dst << "'" << std::endl; } else { auto _src = src; auto _dst = dst; if (src == nullptr) _src = "nullptr"; if (dst == nullptr) _dst = "nullptr"; std::cout << "FAIL: '" << _src << "' != '" << _dst << "' ( = '" << normalized.scstr() << "')" << std::endl; } } int main() { ASSERT_STREQ ( "/", "/" ); ASSERT_STREQ ( "/..//bbb", "/bbb" ); ASSERT_STREQ ( "/quite/long/path/../../../etc/passwd", "/etc/passwd" ); ASSERT_STREQ ( "/aaa/bbb/ccc/ddd/../../../../../../../", "/" ); ASSERT_STREQ ( "", "" ); ASSERT_STREQ ( nullptr, "" ); ASSERT_STREQ ( "aaa/", "aaa" ); ASSERT_STREQ ( "aaa/.", "aaa" ); ASSERT_STREQ ( "aaa/././././////././", "aaa" ); ASSERT_STREQ ( "aaa/////", "aaa" ); ASSERT_STREQ ( "aaa/bbb/ccc", "aaa/bbb/ccc" ); ASSERT_STREQ ( "aaa/bbb/ccc/ddd/..", "aaa/bbb/ccc" ); ASSERT_STREQ ( "aaa/bbb/ccc/ddd/../../..", "aaa" ); ASSERT_STREQ ( "aaa/bbb/ccc/ddd/../../../xxx", "aaa/xxx" ); ASSERT_STREQ ( "aaa/bbb/ccc/ddd/../../../..", "" ); ASSERT_STREQ ( "aaa/bbb/ccc/ddd/../../../../", "" ); ASSERT_STREQ ( "aaa/bbb/ccc/ddd/../../../../../../../", "../../.." ); ASSERT_STREQ ( "..//bbb", "../bbb" ); return 0; } ==== Fixes CVE-2020-29050. Signed-off-by: Vasyl Gello <vasek.gello@gmail.com> --- doc/sphinx.html | 19 ++++++++++- doc/sphinx.txt | 19 ++++++++++- sphinx.conf.in | 4 +-- src/searchd.cpp | 8 ++++- src/sphinx.cpp | 71 ++++++++++++++++++++++++++++++++++++++++++ src/sphinxexcerpt.cpp | 14 +++++++++ src/sphinxexcerpt.h | 3 ++ src/sphinxstd.h | 3 ++ test/test_130/test.xml | 7 +++-- 9 files changed, 140 insertions(+), 8 deletions(-) diff --git a/doc/sphinx.html b/doc/sphinx.html index b56e445..8ad44dd 100644 --- a/doc/sphinx.html +++ b/doc/sphinx.html @@ -11652,7 +11652,7 @@ binlog_max_log_size = 16M <div class="sect2" title="12.4.28. snippets_file_prefix"><div class="titlepage"><div><div><h3 class="title"><a name="conf-snippets-file-prefix"></a>12.4.28. snippets_file_prefix</h3></div></div></div> <p> A prefix to prepend to the local file names when generating snippets. -Optional, default is empty. +Optional, default is current working folder. Introduced in version 2.1.1-beta. </p><p> This prefix can be used in distributed snippets generation along with @@ -11663,6 +11663,19 @@ is set to "server1" and the request refers to "file23", <code class="filename">s will attempt to open "server1file23" (all of that without quotes). So if you need it to be a path, you have to mention the trailing slash. </p><p> +After constructing final file path, daemon unwinds all relative dirs and +compares final result with the value of ``snippet_file_prefix``. If result +is not begin with the prefix, such file will be rejected with error message. + +So, if you set it to '/mnt/data' and somebody calls snippet generation with file +'../../../etc/passwd', as the source, it will get error message +`File '/mnt/data/../../../etc/passwd' escapes '/mnt/data/' scope` +instead of content of the file. + +Also, with non-set parameter and reading '/etc/passwd' it will actually read +/daemon/working/folder/etc/passwd since default for param is exactly daemon's +working folder. +</p><p> Note also that this is a local option, it does not affect the agents anyhow. So you can safely set a prefix on a master server. The requests routed to the agents will not be affected by the master's setting. They will however be affected @@ -11673,6 +11686,10 @@ This might be useful, for instance, when the document storage locations </p><h4><a name="idp33320288"></a>Example:</h4><pre class="programlisting"> snippets_file_prefix = /mnt/common/server1/ </pre></div> +<p><span class="bold"><strong>WARNING:</strong></span> +If you still want to access files from the FS root, you have to explicitly set +'snippets_file_prefix' to empty value (by 'snippets_file_prefix=' line), or to +root (by 'snippets_file_prefix=/'). <div class="sect2" title="12.4.29. collation_server"><div class="titlepage"><div><div><h3 class="title"><a name="conf-collation-server"></a>12.4.29. collation_server</h3></div></div></div> <p> Default server collation. diff --git a/doc/sphinx.txt b/doc/sphinx.txt index ed994f9..f750f4e 100644 --- a/doc/sphinx.txt +++ b/doc/sphinx.txt @@ -12832,7 +12832,7 @@ Example: ----------------------------- A prefix to prepend to the local file names when generating snippets. -Optional, default is empty. Introduced in version 2.1.1-beta. +Optional, default is current working folder. Introduced in version 2.1.1-beta. This prefix can be used in distributed snippets generation along with load_files or load_files_scattered options. @@ -12842,6 +12842,19 @@ to "server1" and the request refers to "file23", searchd will attempt to open "server1file23" (all of that without quotes). So if you need it to be a path, you have to mention the trailing slash. +After constructing final file path, daemon unwinds all relative dirs and +compares final result with the value of ``snippet_file_prefix``. If result +is not begin with the prefix, such file will be rejected with error message. + +So, if you set it to '/mnt/data' and somebody calls snippet generation with file +'../../../etc/passwd', as the source, it will get error message +`File '/mnt/data/../../../etc/passwd' escapes '/mnt/data/' scope` +instead of content of the file. + +Also, with non-set parameter and reading '/etc/passwd' it will actually read +/daemon/working/folder/etc/passwd since default for param is exactly daemon's +working folder. + Note also that this is a local option, it does not affect the agents anyhow. So you can safely set a prefix on a master server. The requests routed to the agents will not be affected by the master's setting. They @@ -12855,6 +12868,10 @@ Example: | snippets_file_prefix = /mnt/common/server1/ +WARNING: If you still want to access files from the FS root, you have to +explicitly set 'snippets_file_prefix' to empty value (by 'snippets_file_prefix=' +line), or to root (by 'snippets_file_prefix=/'). + 12.4.29. collation_server ------------------------- diff --git a/sphinx.conf.in b/sphinx.conf.in index 6ba2dc9..527bbd8 100644 --- a/sphinx.conf.in +++ b/sphinx.conf.in @@ -604,7 +604,7 @@ index test1 # snippet document file name prefix # preprended to file names when generating snippets using load_files option # WARNING, this is a prefix (not a path), trailing slash matters! - # optional, default is empty + # optional, default is current working directory of a running process # # snippets_file_prefix = /mnt/mydocs/server1 @@ -1042,7 +1042,7 @@ searchd # a prefix to prepend to the local file names when creating snippets # with load_files and/or load_files_scatter options - # optional, default is empty + # optional, default is current working directory of a running process # # snippets_file_prefix = /mnt/common/server1/ } diff --git a/src/searchd.cpp b/src/searchd.cpp index 85b1cd6..6462b16 100644 --- a/src/searchd.cpp +++ b/src/searchd.cpp @@ -13330,6 +13330,12 @@ bool MakeSnippets ( CSphString sIndex, CSphVector<ExcerptQuery_t> & dQueries, CS struct stat st; CSphString sFilename; sFilename.SetSprintf ( "%s%s", g_sSnippetsFilePrefix.cstr(), dQueries[i].m_sSource.cstr() ); + if ( !TestEscaping ( g_sSnippetsFilePrefix, sFilename )) + { + sError.SetSprintf( "File '%s' escapes '%s' scope", + sFilename.scstr(), g_sSnippetsFilePrefix.scstr()); + return false; + } if ( ::stat ( sFilename.cstr(), &st )<0 ) { if ( !bScattered ) @@ -23719,7 +23725,7 @@ int WINAPI ServiceMain ( int argc, char **argv ) if ( hSearchd.Exists ( "snippets_file_prefix" ) ) g_sSnippetsFilePrefix = hSearchd["snippets_file_prefix"].cstr(); else - g_sSnippetsFilePrefix = ""; + g_sSnippetsFilePrefix.SetSprintf("%s/", sphGetCwd().scstr()); const char* sLogFormat = hSearchd.GetStr ( "query_log_format", "plain" ); if ( !strcmp ( sLogFormat, "sphinxql" ) ) diff --git a/src/sphinx.cpp b/src/sphinx.cpp index d6a7b9d..492c908 100644 --- a/src/sphinx.cpp +++ b/src/sphinx.cpp @@ -81,9 +81,11 @@ #include <io.h> // for open() // workaround Windows quirks + #include <direct.h> #define popen _popen #define pclose _pclose #define snprintf _snprintf + #define getcwd _getcwd #define sphSeek _lseeki64 #define stat _stat64 @@ -12420,6 +12422,75 @@ static bool sphTruncate ( int iFD ) #endif } +CSphString sphNormalizePath( const CSphString& sOrigPath ) +{ + CSphVector<CSphString> dChunks; + const char* sBegin = sOrigPath.scstr(); + const char* sEnd = sBegin + sOrigPath.Length(); + const char* sPath = sBegin; + int iLevel = 0; + + while ( sPath<sEnd ) + { + const char* sSlash = ( char* ) memchr( sPath, '/', sEnd - sPath ); + if ( !sSlash ) + sSlash = sEnd; + + auto iChunkLen = sSlash - sPath; + + switch ( iChunkLen ) + { + case 0: // empty chunk skipped + ++sPath; + continue; + case 1: // simple dot chunk skipped + if ( *sPath=='.' ) + { + sPath += 2; + continue; + } + break; + case 2: // double dot abandons chunks, then decrease level + if ( sPath[0]=='.' && sPath[1]=='.' ) + { + if ( dChunks.GetLength() <= 0 ) + --iLevel; + else + dChunks.Pop(); + sPath += 3; + continue; + } + default: break; + } + CSphString temp( "" ); + temp.SetBinary( sPath, iChunkLen ); + dChunks.Add( temp ); + sPath = sSlash + 1; + } + + CSphStringBuilder sResult; + if ( *sBegin=='/' ) + sResult += "/"; + else + while ( iLevel++<0 ) + dChunks.Insert(0, ".."); + + int i; + for ( i=0; i<dChunks.GetLength(); i++ ) { + sResult += dChunks[i].scstr(); + if (i<dChunks.GetLength()-1) + sResult += "/"; + } + + return sResult.cstr(); +} + +CSphString sphGetCwd() +{ + CSphVector<char> sBuf (65536); + return getcwd( sBuf.Begin(), sBuf.GetLength()); +} + class DeleteOnFail : public ISphNoncopyable { public: diff --git a/src/sphinxexcerpt.cpp b/src/sphinxexcerpt.cpp index b42c6a2..ff593f0 100644 --- a/src/sphinxexcerpt.cpp +++ b/src/sphinxexcerpt.cpp @@ -3817,6 +3817,11 @@ void sphBuildExcerpt ( ExcerptQuery_t & tOptions, const CSphIndex * pIndex, cons { CSphString sFilename; sFilename.SetSprintf ( "%s%s", tOptions.m_sFilePrefix.cstr(), tOptions.m_sSource.cstr() ); + if ( !TestEscaping( tOptions.m_sFilePrefix.scstr(), sFilename )) + { + sError.SetSprintf( "File '%s' escapes '%s' scope", sFilename.scstr(), tOptions.m_sFilePrefix.scstr()); + return; + } if ( tFile.Open ( sFilename.cstr(), SPH_O_READ, sError )<0 ) return; } else if ( tOptions.m_sSource.IsEmpty() ) @@ -3859,6 +3864,15 @@ void sphBuildExcerpt ( ExcerptQuery_t & tOptions, const CSphIndex * pIndex, cons sWarning, sError, pQueryTokenizer, tOptions.m_dRes ); } +// check whether filepath from sPath does not escape area of sPrefix +bool TestEscaping( const CSphString& sPrefix, const CSphString& sPath ) +{ + if ( sPrefix.IsEmpty() || sPrefix==sPath ) + return true; + auto sNormalized = sphNormalizePath( sPath ); + return sPrefix==sNormalized.SubString( 0, sPrefix.Length()); +} + // // $Id$ // diff --git a/src/sphinxexcerpt.h b/src/sphinxexcerpt.h index cf48b1f..87a55d4 100644 --- a/src/sphinxexcerpt.h +++ b/src/sphinxexcerpt.h @@ -81,6 +81,9 @@ struct XQQuery_t; void sphBuildExcerpt ( ExcerptQuery_t & tOptions, const CSphIndex * pIndex, const CSphHTMLStripper * pStripper, const XQQuery_t & tExtQuery, DWORD eExtQuerySPZ, CSphString & sWarning, CSphString & sError, CSphDict * pDict, ISphTokenizer * pDocTokenizer, ISphTokenizer * pQueryTokenizer ); +// helper whether filepath from sPath does not escape area of sPrefix +bool TestEscaping( const CSphString& sPrefix, const CSphString& sPath ); + #endif // _sphinxexcerpt_ // diff --git a/src/sphinxstd.h b/src/sphinxstd.h index 39cc7ee..c1f15c1 100644 --- a/src/sphinxstd.h +++ b/src/sphinxstd.h @@ -2294,6 +2294,9 @@ int sphOpenFile ( const char * sFile, CSphString & sError ); /// return size of file descriptor int64_t sphGetFileSize ( int iFD, CSphString & sError ); +// unwind different tricks like "../../../etc/passwd" +CSphString sphNormalizePath ( const CSphString& sOrigPath ); +CSphString sphGetCwd(); /// buffer trait that neither own buffer nor clean-up it on destroy template < typename T > diff --git a/test/test_130/test.xml b/test/test_130/test.xml index d8f746c..41e4961 100644 --- a/test/test_130/test.xml +++ b/test/test_130/test.xml @@ -7,6 +7,7 @@ searchd { <searchd_settings/> + snippets_file_prefix=<this_test/>/ } source test @@ -30,15 +31,15 @@ index test $results = array(); -$docs = array( 'test_130/load_file.txt' ); +$docs = array( "load_file.txt" ); $opts = array( 'load_files'=>true, 'limit'=>0 ); $results[] = $client->BuildExcerpts($docs, 'test', 'end point', $opts ); $results[] = $client->BuildExcerpts($docs, 'test', 'not_found', $opts ); -$results[] = $client->BuildExcerpts(array( 'test_130/empty.txt' ), 'test', 'end point', $opts ); +$results[] = $client->BuildExcerpts(array( 'empty.txt' ), 'test', 'end point', $opts ); $results[] = $client->BuildExcerpts(array( '' ), 'test', 'not_found', $opts ); $results[] = $client->GetLastError(); -$results[] = $client->BuildExcerpts ( array ( 'test_130/512k.xml' ), 'test', 'it builds', array ( "limit" => 100, "load_files" => true ) ); +$results[] = $client->BuildExcerpts ( array ( '512k.xml' ), 'test', 'it builds', array ( "limit" => 100, "load_files" => true ) ); ]]></custom_test> -- 2.17.1
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