Fix crash in p3Peers::loadCertificateFromString

This function is part of the public API so it must be safe to call with
any input, before this commit if would crash if feeded with a broken or
empty certificate radix string.

libretroshare/src/pgp/rscertificate.cc

@@ -30,6 +30,7 @@
 #include <pgp/pgpkeyutil.h>
 #include "rscertificate.h"
 #include "util/rsstring.h"
+#include "util/stacktrace.h"
 
 //#define DEBUG_RSCERTIFICATE
 
@@ -88,6 +89,17 @@ void RsCertificate::addPacket(uint8_t ptag, const unsigned char *mem, size_t siz
 	offset += size ;
 }
 
+const RsCertificate&RsCertificate::operator=(const RsCertificate&)
+{
+	memset(ipv4_external_ip_and_port,0,6);
+	memset(ipv4_internal_ip_and_port,0,6);
+	binary_pgp_key = nullptr;
+	binary_pgp_key_size = 0;
+	only_pgp = false;
+	hidden_node = false;
+	return *this;
+}
+
 std::string RsCertificate::toStdString() const
 {
 	//std::string res ;
@@ -154,18 +166,22 @@ std::string RsCertificate::toStdString() const
 	return out2 ;
 }
 
-RsCertificate::RsCertificate(const std::string& str)
-	: 
-	location_name(""), 
-	pgp_version("Version: OpenPGP:SDK v0.9"),
+RsCertificate::RsCertificate(const std::string& str) :
+    location_name(""), pgp_version("Version: OpenPGP:SDK v0.9"),
     dns_name(""), only_pgp(true)
 {
 	uint32_t err_code;
-	binary_pgp_key = NULL ;
+	binary_pgp_key = nullptr;
 
-	if(!initFromString(str,err_code)) 
+	if(!initializeFromString(str, err_code))
+	{
+		std::cerr << __PRETTY_FUNCTION__ << " is deprecated because it can "
+		          << "miserably fail like this! str: " << str
+		          << " err_code: " << err_code << std::endl;
+		print_stacktrace();
 		throw err_code;
 	}
+}
 
 RsCertificate::RsCertificate(const RsPeerDetails& Detail, const unsigned char *binary_pgp_block,size_t binary_pgp_block_size)
 	:pgp_version("Version: OpenPGP:SDK v0.9")
@@ -256,7 +272,7 @@ void RsCertificate::scan_ip(const std::string& ip_string, unsigned short port,un
 	ip_and_port[5] =  port        & 0xff ;
 }
 
-bool RsCertificate::initFromString(const std::string& instr,uint32_t& err_code)
+bool RsCertificate::initializeFromString(const std::string& instr,uint32_t& err_code)
 {
 	try
 	{

libretroshare/src/pgp/rscertificate.h

@@ -54,20 +54,33 @@ class RsCertificate
 public:
 	typedef enum { RS_CERTIFICATE_OLD_FORMAT, RS_CERTIFICATE_RADIX } Format;
 
-		// Constructs from text.
-		//		- new format: The input string should only contain radix chars and spaces/LF/tabs.
-		//
-		explicit RsCertificate(const std::string& input_string) ;
+	/**
+	 * @brief Costruct an empty certificate, use toghether with
+	 * if(initializeFromString) for safe certificate radix string parsing
+	 */
+	RsCertificate() :
+	    ipv4_external_ip_and_port{0,0,0,0,0,0},
+	    ipv4_internal_ip_and_port{0,0,0,0,0,0},
+	    binary_pgp_key(nullptr), binary_pgp_key_size(0),
+	    pgp_version("Version: OpenPGP:SDK v0.9"), only_pgp(true),
+	    hidden_node(false) {}
 
-		// Constructs from binary gpg key, and RsPeerDetails.
-		//
-		RsCertificate(const RsPeerDetails& details,const unsigned char *gpg_mem_block,size_t gpg_mem_block_size) ;
+	/**
+	 * @brief Initialize from certificate string
+	 * @param[in] str radix format string
+	 * @param[out] errCode storage for eventual error code
+	 * @return false on failure, true otherwise
+	 */
+	bool initializeFromString(const std::string& str, uint32_t& errCode);
 
-		// Constructs
+	/// Constructs from binary gpg key, and RsPeerDetails.
+	RsCertificate( const RsPeerDetails& details,
+	               const unsigned char *gpg_mem_block,
+	               size_t gpg_mem_block_size );
 
 	virtual ~RsCertificate();
 
-		// Outut to text
+	/// Convert to certificate radix string
 	std::string toStdString() const;
 
 	std::string ext_ip_string() const;
@@ -85,23 +98,32 @@ class RsCertificate
 	const unsigned char *pgp_key() const { return binary_pgp_key ; }
 	size_t pgp_key_size() const { return binary_pgp_key_size ; }
 
-		static bool cleanCertificate(const std::string& input, std::string& output, RsCertificate::Format& format, int& error_code, bool check_content) ;
+	static bool cleanCertificate(
+	        const std::string& input, std::string& output,
+	        RsCertificate::Format& format, int& error_code, bool check_content);
+
 	const std::set<RsUrl>& locators() const { return mLocators; }
 
+	/**
+	 * @deprecated using this costructor may raise exception that cause
+	 *	crash if not handled, use empty constructor + if(initFromString) for a
+	 *	safer behaviour.
+	 */
+	RS_DEPRECATED explicit RsCertificate(const std::string& input_string);
+
 private:
-		static bool cleanCertificate(const std::string& input,std::string& output,int&) ;					// new radix format
-		static void scan_ip(const std::string& ip_string, unsigned short port,unsigned char *destination_memory) ;
+	// new radix format
+	static bool cleanCertificate( const std::string& input,
+	                              std::string& output, int&);
 
-		bool initFromString(const std::string& str,uint32_t& err_code) ;
+	static void scan_ip( const std::string& ip_string, unsigned short port,
+	                     unsigned char *destination_memory );
 
-		static void addPacket(uint8_t ptag, const unsigned char *mem, size_t size, unsigned char *& buf, size_t& offset, size_t& buf_size) ;
+	static void addPacket(uint8_t ptag, const unsigned char *mem, size_t size,
+	                      unsigned char*& buf, size_t& offset, size_t& buf_size);
 
-		RsCertificate(const RsCertificate&) {}	// non copy-able
-		const RsCertificate& operator=(const RsCertificate&)
-		{ memset(ipv4_external_ip_and_port,0,6); memset(ipv4_internal_ip_and_port,0,6);
-			binary_pgp_key = NULL; binary_pgp_key_size = 0;
-			only_pgp = false; hidden_node = false;
-			return *this ;}	// non copy-able
+	RsCertificate(const RsCertificate&) {} /// non copy-able
+	const RsCertificate& operator=(const RsCertificate&); /// non copy-able
 
 	unsigned char ipv4_external_ip_and_port[6];
 	unsigned char ipv4_internal_ip_and_port[6];
@@ -116,7 +138,7 @@ class RsCertificate
 	std::string hidden_node_address;
 	std::set<RsUrl> mLocators;
 
-		bool only_pgp ; // does the cert contain only pgp info?
-		bool hidden_node; // IP or hidden Node Address.
+	bool only_pgp ; /// does the cert contain only pgp info?
+	bool hidden_node; /// IP or hidden Node Address.
 };
 

libretroshare/src/rsserver/p3peers.cc

@@ -1213,12 +1213,22 @@ std::string p3Peers::GetRetroshareInvite(
 
 //===========================================================================
 
-bool 	p3Peers::loadCertificateFromString(const std::string& cert, RsPeerId& ssl_id, RsPgpId& gpg_id, std::string& error_string)
+bool p3Peers::loadCertificateFromString(
+        const std::string& cert, RsPeerId& ssl_id,
+        RsPgpId& gpg_id, std::string& error_string )
 {
-	RsCertificate crt(cert) ;
-	RsPgpId gpgid ;
+	RsCertificate crt;
+	uint32_t errNum = 0;
+	if(!crt.initializeFromString(cert,errNum))
+	{
+		error_string = "RsCertificate failed with errno: "
+		        + std::to_string(errNum) + " parsing: " + cert;
+		return false;
+	}
 
-	bool res = AuthGPG::getAuthGPG()->LoadCertificateFromString(crt.armouredPGPKey(),gpgid,error_string) ;
+	RsPgpId gpgid;
+	bool res = AuthGPG::getAuthGPG()->
+	        LoadCertificateFromString(crt.armouredPGPKey(), gpgid,error_string);
 
 	gpg_id = gpgid;
 	ssl_id = crt.sslid();