tex: add more CSP stuff

tex/references.bib

@@ -357,7 +357,19 @@ institution = {International Organization for Standardization}
 	booktitle = {Proceedings of the 5th ACM SIGSAC Conference on Computer and Communications Security (CCS '16)},
 	address = {New York, NY, USA},
 	doi = {10.1145/297674},
+	isbn = {978-1-4503-4139-4/16},
+	pages = {1376-1387},
 	year = 2016,
 }
 
+@inproceedings{reininginCSP,
+	title = {{Reining in the Web with Content Security Policy}},
+	author = {Sid Stamm and Brandon Sterne and Gervase Markham},
+	booktitle = {Proceedings of the 19th International Conference on World Wide Web},
+	address = {Raleigh, North Carolina, USA},
+	isbn = {978-1-60558-799},
+	pages = {921-930},
+	year = 2010,
+}
+
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tex/text.tex

@@ -492,7 +492,8 @@ are parsed and displayed, which has been discussed in depth in previous
 sections.
 
 As per Weichselbaum et al.\ CSP is a mechanism designed to mitigate
-XSS~\cite{longliveCSP}. It is a declarative policy mechanism that allows the
+XSS~\cite{longliveCSP}, a long-lived king of the vulnerability
+lists~\cite{reininginCSP}. It is a declarative policy mechanism that allows the
 website operator to decide what client-side resources can load and what origins
 are permitted. Scripts can be restricted to only load from a list of trusted
 domains and inline scripts can be blocked completely. The scripts can also be
@@ -508,9 +509,19 @@ keyword and suffixed `-src', such as \texttt{script-src}, \texttt{img-src} or
 representing this group nicely. Sections are delimited using semicolons and
 each section can only appear once. Special values exist for the origin itself
 (\texttt{'self'}) and disallowing any source (\texttt{'none'}). A good CSP is
-targeted and not overly broad. For instance, a website that loads no JavaScript
-at all does not need to allow a popular CDN (Content Delivery Network) origin
-in its \texttt{script-src}, instead it can be set to \texttt{'none'}.
+targeted and not overly broad. To give an example, a website that loads no
+JavaScript at all does not need to allow a popular CDN (Content Delivery
+Network) origin in its \texttt{script-src}, instead it should be set to
+\texttt{'none'}. CSP can also aid with clickjacking protection using its
+\texttt{frame-ancestors} directive, which could limit origins that could be
+embed the website, preventing attacker from embedding the website at random
+places.
+
+Getting CSP right can be tricky at first but once grokked, it is relatively
+straight-forward and can increase the security of the site greatly. There are
+many more directives and settings than mentioned in this section, the author
+encourages anybody interested to give it a read, e.g.\ at
+\url{https://web.dev/csp/}.
 
 
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