Date: Sun, 23 Oct 2011 16:47:38 GMT From: Ryan Steinmetz <zi@FreeBSD.org> To: freebsd-gnats-submit@FreeBSD.org Subject: bin/161936: [openbsm][patch] praudit can produce invalid XML output Message-ID: <201110231647.p9NGlcm9029317@red.freebsd.org> Resent-Message-ID: <201110231650.p9NGo3lG017129@freefall.freebsd.org>
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>Number: 161936 >Category: bin >Synopsis: [openbsm][patch] praudit can produce invalid XML output >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Sun Oct 23 16:50:03 UTC 2011 >Closed-Date: >Last-Modified: >Originator: Ryan Steinmetz >Release: 8.2-RELEASE >Organization: Rochester Institute of Technology >Environment: >Description: When using praudit to display audit entries, the XML output argument (-x) will cause praudit to print invalid XML in certain circumstances. This surfaces anytime a command is audited that contains invalid XML characters (& or <). >How-To-Repeat: Ensure command logging is enabled and execute a command like the following: % echo hi < test && ls % praudit -x >file.tmp Then use an XML parser to try to parse file.tmp, it will complain about invalid characters due to the presence of & and < in places they should not be. >Fix: Applying the attached patch to contrib/openbsm/libbsm/bsm_io.c properly sanitizes the entries as they are printed by replacing instances of & with & and < with < cd /usr/src patch < /path/to/bsm_io.c.diff cd lib/libbsm && make clean;make obj && make depend && make && make install Patch attached with submission follows: --- contrib/openbsm/libbsm/bsm_io.c.orig 2011-10-23 12:10:40.000000000 -0400 +++ contrib/openbsm/libbsm/bsm_io.c 2011-10-23 12:35:31.000000000 -0400 @@ -214,6 +214,28 @@ } /* + * Prints the given data bytes as an XML-sanitized string + */ +static void +print_xml_string(FILE *fp, const char *str, size_t len) +{ + u_int32_t i; + + if (len > 0) { + for (i = 0; i < len; i++) { + if (str[i] != '\0') { + if (str[i] == '&') + fprintf(fp, "&"); + else if (str[i] == '<') + fprintf(fp, "<"); + else + fprintf(fp, "%c", str[i]); + } + } + } +} + +/* * Prints the beggining of attribute. */ static void @@ -1855,7 +1877,7 @@ for (i = 0; i < tok->tt.execarg.count; i++) { if (xml) { fprintf(fp, "<arg>"); - print_string(fp, tok->tt.execarg.text[i], + print_xml_string(fp, tok->tt.execarg.text[i], strlen(tok->tt.execarg.text[i])); fprintf(fp, "</arg>"); } else { @@ -1914,7 +1936,7 @@ for (i = 0; i< tok->tt.execenv.count; i++) { if (xml) { fprintf(fp, "<env>"); - print_string(fp, tok->tt.execenv.text[i], + print_xml_string(fp, tok->tt.execenv.text[i], strlen(tok->tt.execenv.text[i])); fprintf(fp, "</env>"); } else { >Release-Note: >Audit-Trail: >Unformatted:
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