Module: kamailio Branch: master Commit: baed515e8aed8e5b505ff716eb57d0c60e582632 URL: https://github.com/kamailio/kamailio/commit/baed515e8aed8e5b505ff716eb57d0c6...

Author: Daniel-Constantin Mierla miconda@gmail.com Committer: Daniel-Constantin Mierla miconda@gmail.com Date: 2021-09-06T13:01:55+02:00

core: parse content length - consider multi line header format

- safety checks for log message when not parsing the message buffer

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Modified: src/core/parser/parse_content.c

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Diff: https://github.com/kamailio/kamailio/commit/baed515e8aed8e5b505ff716eb57d0c6... Patch: https://github.com/kamailio/kamailio/commit/baed515e8aed8e5b505ff716eb57d0c6...

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diff --git a/src/core/parser/parse_content.c b/src/core/parser/parse_content.c index 007217df96..34cdd40e36 100644 --- a/src/core/parser/parse_content.c +++ b/src/core/parser/parse_content.c @@ -219,6 +219,10 @@ char* parse_content_length(char* const buffer, const char* const end, int size;

p = buffer; + if(buffer>=end) { + LM_ERR("empty input buffer: %p - %p\n", buffer, end); + goto error; + } /* search the begining of the number */ while ( p<end && (*p==' ' || *p=='\t' || (*p=='\n' && (*(p+1)==' '||*(p+1)=='\t')) )) @@ -235,20 +239,40 @@ char* parse_content_length(char* const buffer, const char* const end, } if (p==end || size==0) goto error; - /* now we should have only spaces at the end */ - while ( p<end && (*p==' ' || *p=='\t' || - (*p=='\n' && (*(p+1)==' '||*(p+1)=='\t')) )) - p++; - if (p==end) - goto error; - /* the header ends proper? */ - if ( (*(p++)!='\n') && (*(p-1)!='\r' || *(p++)!='\n' ) ) - goto error; + do { + /* only spaces till the end-of-header */ + while (p<end && (*p==' ' || *p=='\t')) p++; + if (p==end) + goto error; + /* EOH with \n or \r\n */ + if(*p=='\n') { + p++; + } else if (p+1<end && *p=='\r' && *(p+1)=='\n') { + p += 2; + } else { + /* no valid EOH */ + goto error; + } + if(p<end) { + /* multi line header body */ + if(*p==' ' || *p=='\t') { + p++; + if (p==end) + goto error; + } else { + break; + } + } + } while(p<end);

*length = number; return p; error: - LM_ERR("parse error near char [%d][%c]\n", *p, *p); + if(p<end) { + LM_ERR("parse error near char [%d][%c]\n", *p, *p); + } else { + LM_ERR("parse error over the end of input: %p - %p\n", buffer, end); + } return 0; }