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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * snmplocalsm.c</span>
<a name="l00003"></a>00003 <span class="comment"> *</span>
<a name="l00004"></a>00004 <span class="comment"> * This code implements a security model that assumes the local user</span>
<a name="l00005"></a>00005 <span class="comment"> * that executed the agent is the user who&#39;s attributes called</span>
<a name="l00006"></a>00006 <span class="comment"> */</span>
<a name="l00007"></a>00007 
<a name="l00008"></a>00008 <span class="preprocessor">#include &lt;net-snmp/net-snmp-config.h&gt;</span>
<a name="l00009"></a>00009 
<a name="l00010"></a>00010 <span class="preprocessor">#include &lt;net-snmp/net-snmp-includes.h&gt;</span>
<a name="l00011"></a>00011 
<a name="l00012"></a>00012 <span class="preprocessor">#include &lt;net-snmp/library/snmplocalsm.h&gt;</span>
<a name="l00013"></a>00013 
<a name="l00014"></a>00014 <span class="preprocessor">#include &lt;unistd.h&gt;</span>
<a name="l00015"></a>00015 
<a name="l00016"></a>00016 <span class="keyword">static</span> <span class="keywordtype">int</span>      localsm_session_init(<a class="code" href="structsnmp__session.html" title="The snmp session structure.">netsnmp_session</a> *);
<a name="l00017"></a>00017 <span class="keyword">static</span> <span class="keywordtype">void</span>     localsm_free_state_ref(<span class="keywordtype">void</span> *);
<a name="l00018"></a>00018 <span class="keyword">static</span> <span class="keywordtype">int</span>      localsm_free_pdu(<a class="code" href="structsnmp__pdu.html" title="The snmp protocol data unit.">netsnmp_pdu</a> *);
<a name="l00019"></a>00019 <span class="keyword">static</span> <span class="keywordtype">int</span>      localsm_clone_pdu(<a class="code" href="structsnmp__pdu.html" title="The snmp protocol data unit.">netsnmp_pdu</a> *, <a class="code" href="structsnmp__pdu.html" title="The snmp protocol data unit.">netsnmp_pdu</a> *);
<a name="l00020"></a>00020 
<a name="l00021"></a>00021 u_int next_sess_id = 1;
<a name="l00022"></a>00022 
<a name="l00024"></a>00024 <span class="keywordtype">void</span>
<a name="l00025"></a>00025 init_localsm(<span class="keywordtype">void</span>)
<a name="l00026"></a>00026 {
<a name="l00027"></a>00027     <span class="keyword">struct </span><a class="code" href="structsnmp__secmod__def.html">snmp_secmod_def</a> *def;
<a name="l00028"></a>00028     <span class="keywordtype">int</span> ret;
<a name="l00029"></a>00029 
<a name="l00030"></a>00030     def = <a class="code" href="group__util.html#ga6356941968481380ea6f4a646df4aaf9" title="Mallocs memory of sizeof(struct s), zeros it and returns a pointer to it.">SNMP_MALLOC_STRUCT</a>(<a class="code" href="structsnmp__secmod__def.html">snmp_secmod_def</a>);
<a name="l00031"></a>00031 
<a name="l00032"></a>00032     <span class="keywordflow">if</span> (!def) {
<a name="l00033"></a>00033         <a class="code" href="group__snmp__logging.html#ga9ba905368ea1c551b969af44b13e37c2" title="This snmp logging function allows variable argument list given the specified format and priority...">snmp_log</a>(LOG_ERR,
<a name="l00034"></a>00034                  <span class="stringliteral">&quot;Unable to malloc snmp_secmod struct, not registering LOCALSM\n&quot;</span>);
<a name="l00035"></a>00035         <span class="keywordflow">return</span>;
<a name="l00036"></a>00036     }
<a name="l00037"></a>00037 
<a name="l00038"></a>00038     def-&gt;encode_reverse = localsm_rgenerate_out_msg;
<a name="l00039"></a>00039     def-&gt;decode = localsm_process_in_msg;
<a name="l00040"></a>00040     def-&gt;session_open = localsm_session_init;
<a name="l00041"></a>00041     def-&gt;pdu_free_state_ref = localsm_free_state_ref;
<a name="l00042"></a>00042     def-&gt;pdu_free = localsm_free_pdu;
<a name="l00043"></a>00043     def-&gt;pdu_clone = localsm_clone_pdu;
<a name="l00044"></a>00044 
<a name="l00045"></a>00045     DEBUGMSGTL((<span class="stringliteral">&quot;localsm&quot;</span>,<span class="stringliteral">&quot;registering ourselves\n&quot;</span>));
<a name="l00046"></a>00046     ret = register_sec_mod(NETSNMP_LOCALSM_SECURITY_MODEL, <span class="stringliteral">&quot;localsm&quot;</span>, def);
<a name="l00047"></a>00047     DEBUGMSGTL((<span class="stringliteral">&quot;localsm&quot;</span>,<span class="stringliteral">&quot; returned %d\n&quot;</span>, ret));
<a name="l00048"></a>00048 }
<a name="l00049"></a>00049 
<a name="l00050"></a>00050 <span class="comment">/*</span>
<a name="l00051"></a>00051 <span class="comment"> * Initialize specific session information (right now, just set up things to</span>
<a name="l00052"></a>00052 <span class="comment"> * not do an engineID probe)</span>
<a name="l00053"></a>00053 <span class="comment"> */</span>
<a name="l00054"></a>00054 
<a name="l00055"></a>00055 <span class="keyword">static</span> <span class="keywordtype">int</span>
<a name="l00056"></a>00056 localsm_session_init(<a class="code" href="structsnmp__session.html" title="The snmp session structure.">netsnmp_session</a> * sess)
<a name="l00057"></a>00057 {
<a name="l00058"></a>00058     DEBUGMSGTL((<span class="stringliteral">&quot;localsm&quot;</span>,
<a name="l00059"></a>00059                 <span class="stringliteral">&quot;LOCALSM: Reached our session initialization callback\n&quot;</span>));
<a name="l00060"></a>00060 
<a name="l00061"></a>00061     sess-&gt;flags |= SNMP_FLAGS_DONT_PROBE;
<a name="l00062"></a>00062 
<a name="l00063"></a>00063     <span class="comment">/* XXX: likely needed for something: */</span>
<a name="l00064"></a>00064     <span class="comment">/*</span>
<a name="l00065"></a>00065 <span class="comment">    localsmsession = sess-&gt;securityInfo =</span>
<a name="l00066"></a>00066 <span class="comment">    if (!localsmsession)</span>
<a name="l00067"></a>00067 <span class="comment">        return SNMPERR_GENERR;</span>
<a name="l00068"></a>00068 <span class="comment">    */</span>
<a name="l00069"></a>00069 
<a name="l00070"></a>00070     <span class="keywordflow">return</span> SNMPERR_SUCCESS;
<a name="l00071"></a>00071 }
<a name="l00072"></a>00072 
<a name="l00074"></a>00074 <span class="keyword">static</span> <span class="keywordtype">void</span>
<a name="l00075"></a>00075 localsm_free_state_ref(<span class="keywordtype">void</span> *ptr)
<a name="l00076"></a>00076 {
<a name="l00077"></a>00077     free(ptr);
<a name="l00078"></a>00078 }
<a name="l00079"></a>00079 
<a name="l00081"></a>00081 <span class="keyword">static</span> <span class="keywordtype">int</span>
<a name="l00082"></a>00082 localsm_free_pdu(<a class="code" href="structsnmp__pdu.html" title="The snmp protocol data unit.">netsnmp_pdu</a> *pdu)
<a name="l00083"></a>00083 {
<a name="l00084"></a>00084     <span class="keywordflow">return</span> SNMPERR_SUCCESS;
<a name="l00085"></a>00085 }
<a name="l00086"></a>00086 
<a name="l00088"></a>00088 <span class="keyword">static</span> <span class="keywordtype">int</span>
<a name="l00089"></a>00089 localsm_clone_pdu(<a class="code" href="structsnmp__pdu.html" title="The snmp protocol data unit.">netsnmp_pdu</a> *pdu, <a class="code" href="structsnmp__pdu.html" title="The snmp protocol data unit.">netsnmp_pdu</a> *pdu2)
<a name="l00090"></a>00090 {
<a name="l00091"></a>00091     <span class="keywordflow">return</span> SNMPERR_SUCCESS;
<a name="l00092"></a>00092 }
<a name="l00093"></a>00093 
<a name="l00094"></a>00094 <span class="comment">/* asn.1 easing definitions */</span>
<a name="l00095"></a>00095 <span class="preprocessor">#define LOCALSMBUILD_OR_ERR(fun, args, msg, desc)       \</span>
<a name="l00096"></a>00096 <span class="preprocessor">    DEBUGDUMPHEADER(&quot;send&quot;, desc); \</span>
<a name="l00097"></a>00097 <span class="preprocessor">    rc = fun args;            \</span>
<a name="l00098"></a>00098 <span class="preprocessor">    DEBUGINDENTLESS();        \</span>
<a name="l00099"></a>00099 <span class="preprocessor">    if (rc == 0) { \</span>
<a name="l00100"></a>00100 <span class="preprocessor">        DEBUGMSGTL((&quot;localsm&quot;,msg)); \</span>
<a name="l00101"></a>00101 <span class="preprocessor">        retval = SNMPERR_TOO_LONG; \</span>
<a name="l00102"></a>00102 <span class="preprocessor">        goto outerr; \</span>
<a name="l00103"></a>00103 <span class="preprocessor">    }</span>
<a name="l00104"></a>00104 <span class="preprocessor"></span>
<a name="l00105"></a>00105 <span class="preprocessor">#define BUILD_START_SEQ tmpoffset = *offset;</span>
<a name="l00106"></a>00106 <span class="preprocessor"></span>
<a name="l00107"></a>00107 <span class="preprocessor">#define BUILD_END_SEQ(x) LOCALSMBUILD_OR_ERR(asn_realloc_rbuild_sequence, \</span>
<a name="l00108"></a>00108 <span class="preprocessor">                         (wholeMsg, wholeMsgLen, offset, 1, \</span>
<a name="l00109"></a>00109 <span class="preprocessor">                          (u_char) (ASN_SEQUENCE | ASN_CONSTRUCTOR), \</span>
<a name="l00110"></a>00110 <span class="preprocessor">                          *offset - tmpoffset), \</span>
<a name="l00111"></a>00111 <span class="preprocessor">                                          x, &quot;sequence&quot;);</span>
<a name="l00112"></a>00112 <span class="preprocessor"></span>
<a name="l00113"></a>00113 <span class="comment">/****************************************************************************</span>
<a name="l00114"></a>00114 <span class="comment"> *</span>
<a name="l00115"></a>00115 <span class="comment"> * localsm_generate_out_msg</span>
<a name="l00116"></a>00116 <span class="comment"> *</span>
<a name="l00117"></a>00117 <span class="comment"> * Parameters:</span>
<a name="l00118"></a>00118 <span class="comment"> *      (See list below...)</span>
<a name="l00119"></a>00119 <span class="comment"> *</span>
<a name="l00120"></a>00120 <span class="comment"> * Returns:</span>
<a name="l00121"></a>00121 <span class="comment"> *      SNMPERR_SUCCESS                        On success.</span>
<a name="l00122"></a>00122 <span class="comment"> *      ... and others</span>
<a name="l00123"></a>00123 <span class="comment"> *</span>
<a name="l00124"></a>00124 <span class="comment"> *</span>
<a name="l00125"></a>00125 <span class="comment"> * Generate an outgoing message.</span>
<a name="l00126"></a>00126 <span class="comment"> *</span>
<a name="l00127"></a>00127 <span class="comment"> ****************************************************************************/</span>
<a name="l00128"></a>00128 
<a name="l00129"></a>00129 <span class="keywordtype">int</span>
<a name="l00130"></a>00130 localsm_rgenerate_out_msg(<span class="keyword">struct</span> <a class="code" href="structsnmp__secmod__outgoing__params.html">snmp_secmod_outgoing_params</a> *parms)
<a name="l00131"></a>00131 {
<a name="l00132"></a>00132     u_char         **wholeMsg = parms-&gt;wholeMsg;
<a name="l00133"></a>00133     <span class="keywordtype">size_t</span>         *offset = parms-&gt;wholeMsgOffset;
<a name="l00134"></a>00134     <span class="keywordtype">int</span> rc;
<a name="l00135"></a>00135     
<a name="l00136"></a>00136     <span class="keywordtype">size_t</span>         *wholeMsgLen = parms-&gt;wholeMsgLen;
<a name="l00137"></a>00137 
<a name="l00138"></a>00138 
<a name="l00139"></a>00139     DEBUGMSGTL((<span class="stringliteral">&quot;localsm&quot;</span>, <span class="stringliteral">&quot;Starting LOCALSM processing\n&quot;</span>));
<a name="l00140"></a>00140 
<a name="l00141"></a>00141 
<a name="l00142"></a>00142     <span class="comment">/*</span>
<a name="l00143"></a>00143 <span class="comment">     * We define here what the security message section will look like:</span>
<a name="l00144"></a>00144 <span class="comment">     * 04 00 -- null string</span>
<a name="l00145"></a>00145 <span class="comment">     * XXX: need to actually negotiate a context engine ID?</span>
<a name="l00146"></a>00146 <span class="comment">     * XXX: leave room for future expansion just in case?</span>
<a name="l00147"></a>00147 <span class="comment">     */</span>
<a name="l00148"></a>00148     DEBUGDUMPHEADER(<span class="stringliteral">&quot;send&quot;</span>, <span class="stringliteral">&quot;localsm security parameters&quot;</span>);
<a name="l00149"></a>00149     rc = asn_realloc_rbuild_header(wholeMsg, wholeMsgLen, offset, 1,
<a name="l00150"></a>00150                                      (u_char) (ASN_UNIVERSAL | ASN_PRIMITIVE
<a name="l00151"></a>00151                                              | ASN_OCTET_STR), 0);
<a name="l00152"></a>00152     DEBUGINDENTLESS();
<a name="l00153"></a>00153     <span class="keywordflow">if</span> (rc == 0) {
<a name="l00154"></a>00154         DEBUGMSGTL((<span class="stringliteral">&quot;localsm&quot;</span>, <span class="stringliteral">&quot;building msgSecurityParameters failed.\n&quot;</span>));
<a name="l00155"></a>00155         <span class="keywordflow">return</span> SNMPERR_TOO_LONG;
<a name="l00156"></a>00156     }
<a name="l00157"></a>00157     
<a name="l00158"></a>00158     <span class="comment">/*</span>
<a name="l00159"></a>00159 <span class="comment">     * Copy in the msgGlobalData and msgVersion.  </span>
<a name="l00160"></a>00160 <span class="comment">     */</span>
<a name="l00161"></a>00161     <span class="keywordflow">while</span> ((*wholeMsgLen - *offset) &lt; parms-&gt;globalDataLen) {
<a name="l00162"></a>00162         <span class="keywordflow">if</span> (!asn_realloc(wholeMsg, wholeMsgLen)) {
<a name="l00163"></a>00163             DEBUGMSGTL((<span class="stringliteral">&quot;localsm&quot;</span>, <span class="stringliteral">&quot;building global data failed.\n&quot;</span>));
<a name="l00164"></a>00164             <span class="keywordflow">return</span> SNMPERR_TOO_LONG;
<a name="l00165"></a>00165         }
<a name="l00166"></a>00166     }
<a name="l00167"></a>00167 
<a name="l00168"></a>00168     *offset += parms-&gt;globalDataLen;
<a name="l00169"></a>00169     memcpy(*wholeMsg + *wholeMsgLen - *offset,
<a name="l00170"></a>00170            parms-&gt;globalData, parms-&gt;globalDataLen);
<a name="l00171"></a>00171 
<a name="l00172"></a>00172     <span class="comment">/*</span>
<a name="l00173"></a>00173 <span class="comment">     * Total packet sequence.  </span>
<a name="l00174"></a>00174 <span class="comment">     */</span>
<a name="l00175"></a>00175     rc = asn_realloc_rbuild_sequence(wholeMsg, wholeMsgLen, offset, 1,
<a name="l00176"></a>00176                                      (u_char) (ASN_SEQUENCE |
<a name="l00177"></a>00177                                                ASN_CONSTRUCTOR), *offset);
<a name="l00178"></a>00178     <span class="keywordflow">if</span> (rc == 0) {
<a name="l00179"></a>00179         DEBUGMSGTL((<span class="stringliteral">&quot;localsm&quot;</span>, <span class="stringliteral">&quot;building master packet sequence failed.\n&quot;</span>));
<a name="l00180"></a>00180         <span class="keywordflow">return</span> SNMPERR_TOO_LONG;
<a name="l00181"></a>00181     }
<a name="l00182"></a>00182 
<a name="l00183"></a>00183     DEBUGMSGTL((<span class="stringliteral">&quot;localsm&quot;</span>, <span class="stringliteral">&quot;LOCALSM processing completed.\n&quot;</span>));
<a name="l00184"></a>00184     <span class="keywordflow">return</span> SNMPERR_SUCCESS;
<a name="l00185"></a>00185 }
<a name="l00186"></a>00186 
<a name="l00187"></a>00187 <span class="comment">/****************************************************************************</span>
<a name="l00188"></a>00188 <span class="comment"> *</span>
<a name="l00189"></a>00189 <span class="comment"> * localsm_process_in_msg</span>
<a name="l00190"></a>00190 <span class="comment"> *</span>
<a name="l00191"></a>00191 <span class="comment"> * Parameters:</span>
<a name="l00192"></a>00192 <span class="comment"> *      (See list below...)</span>
<a name="l00193"></a>00193 <span class="comment"> *</span>
<a name="l00194"></a>00194 <span class="comment"> * Returns:</span>
<a name="l00195"></a>00195 <span class="comment"> *      LOCALSM_ERR_NO_ERROR                        On success.</span>
<a name="l00196"></a>00196 <span class="comment"> *      LOCALSM_ERR_GENERIC_ERROR</span>
<a name="l00197"></a>00197 <span class="comment"> *      LOCALSM_ERR_UNSUPPORTED_SECURITY_LEVEL</span>
<a name="l00198"></a>00198 <span class="comment"> *</span>
<a name="l00199"></a>00199 <span class="comment"> *</span>
<a name="l00200"></a>00200 <span class="comment"> * Processes an incoming message.</span>
<a name="l00201"></a>00201 <span class="comment"> *</span>
<a name="l00202"></a>00202 <span class="comment"> ****************************************************************************/</span>
<a name="l00203"></a>00203 
<a name="l00204"></a>00204 <span class="keywordtype">int</span>
<a name="l00205"></a>00205 localsm_process_in_msg(<span class="keyword">struct</span> <a class="code" href="structsnmp__secmod__incoming__params.html">snmp_secmod_incoming_params</a> *parms)
<a name="l00206"></a>00206 {
<a name="l00207"></a>00207     u_char type_value;
<a name="l00208"></a>00208     <span class="keywordtype">size_t</span> octet_string_length;
<a name="l00209"></a>00209     u_char *data_ptr;
<a name="l00210"></a>00210 
<a name="l00211"></a>00211     <span class="comment">/* we don&#39;t have one, so set it to 0 */</span>
<a name="l00212"></a>00212     parms-&gt;secEngineID = strdup(<span class="stringliteral">&quot;&quot;</span>);
<a name="l00213"></a>00213     *parms-&gt;secEngineIDLen = 0;
<a name="l00214"></a>00214 
<a name="l00215"></a>00215     <span class="comment">/* if this did not come through a tunneled connection, this</span>
<a name="l00216"></a>00216 <span class="comment">       security model is in appropriate (and would be a HUGE security</span>
<a name="l00217"></a>00217 <span class="comment">       hole to assume otherwise) */</span>
<a name="l00218"></a>00218     DEBUGMSGTL((<span class="stringliteral">&quot;localsm&quot;</span>,<span class="stringliteral">&quot;checking how we got here\n&quot;</span>));
<a name="l00219"></a>00219     <span class="keywordflow">if</span> (!(parms-&gt;pdu-&gt;flags &amp; UCD_MSG_FLAG_TUNNELED)) {
<a name="l00220"></a>00220         DEBUGMSGTL((<span class="stringliteral">&quot;localsm&quot;</span>,<span class="stringliteral">&quot;  not tunneled\n&quot;</span>));
<a name="l00221"></a>00221         <span class="keywordflow">return</span> SNMPERR_USM_AUTHENTICATIONFAILURE;
<a name="l00222"></a>00222     } <span class="keywordflow">else</span> {
<a name="l00223"></a>00223         DEBUGMSGTL((<span class="stringliteral">&quot;localsm&quot;</span>,<span class="stringliteral">&quot;  tunneled\n&quot;</span>));
<a name="l00224"></a>00224     }
<a name="l00225"></a>00225 
<a name="l00226"></a>00226 
<a name="l00227"></a>00227     <span class="comment">/*</span>
<a name="l00228"></a>00228 <span class="comment">     * Eat the first octet header.</span>
<a name="l00229"></a>00229 <span class="comment">     */</span>
<a name="l00230"></a>00230     <span class="keywordflow">if</span> ((data_ptr = asn_parse_sequence(parms-&gt;secParams, &amp;octet_string_length,
<a name="l00231"></a>00231                                         &amp;type_value,
<a name="l00232"></a>00232                                         (ASN_UNIVERSAL | ASN_PRIMITIVE |
<a name="l00233"></a>00233                                          ASN_OCTET_STR),
<a name="l00234"></a>00234                                         <span class="stringliteral">&quot;usm first octet&quot;</span>)) == NULL) {
<a name="l00235"></a>00235         <span class="comment">/*</span>
<a name="l00236"></a>00236 <span class="comment">         * RETURN parse error </span>
<a name="l00237"></a>00237 <span class="comment">         */</span>
<a name="l00238"></a>00238         <span class="keywordflow">return</span> -1;
<a name="l00239"></a>00239     }
<a name="l00240"></a>00240     strncpy(parms-&gt;secName, strdup(getenv(<span class="stringliteral">&quot;USER&quot;</span>)), *parms-&gt;secNameLen);
<a name="l00241"></a>00241     *parms-&gt;secNameLen = strlen(parms-&gt;secName);
<a name="l00242"></a>00242     DEBUGMSGTL((<span class="stringliteral">&quot;localsm&quot;</span>, <span class="stringliteral">&quot;user: %s/%d\n&quot;</span>, parms-&gt;secName, parms-&gt;secNameLen));
<a name="l00243"></a>00243     
<a name="l00244"></a>00244     *parms-&gt;scopedPdu = data_ptr;
<a name="l00245"></a>00245     *parms-&gt;scopedPduLen = parms-&gt;wholeMsgLen - (data_ptr - parms-&gt;wholeMsg);
<a name="l00246"></a>00246     *parms-&gt;maxSizeResponse = parms-&gt;maxMsgSize; <span class="comment">/* XXX */</span>
<a name="l00247"></a>00247     parms-&gt;secEngineID = strdup(<span class="stringliteral">&quot;&quot;</span>);
<a name="l00248"></a>00248     *parms-&gt;secEngineIDLen = 0;
<a name="l00249"></a>00249     parms-&gt;secLevel = SNMP_SEC_LEVEL_NOAUTH;
<a name="l00250"></a>00250 <span class="comment">/*</span>
<a name="l00251"></a>00251 <span class="comment"> * maybe set this based on the transport in the future:</span>
<a name="l00252"></a>00252 <span class="comment"> *</span>
<a name="l00253"></a>00253 <span class="comment">*/</span>
<a name="l00254"></a>00254 
<a name="l00255"></a>00255     <span class="keywordflow">if</span> (octet_string_length != 0)
<a name="l00256"></a>00256         <span class="keywordflow">return</span> -1;
<a name="l00257"></a>00257 
<a name="l00258"></a>00258     <span class="keywordflow">return</span> SNMPERR_SUCCESS;
<a name="l00259"></a>00259 }
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