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[Chapter 22] 22.3 tcpwrapper security problems before they happen. Wietse Venema is to be complimented for thinking to write and include them in his tcpwrapper release; other programmers should follow his example. 22.2 sendmail (smap/smapd) Wrapper 22.4 SOCKS [ Library Home | DNS & BIND | TCP/IP | sendmail | sendmail Reference | Firewalls | Practical Security ] file:///C|/Oreilly Unix etc/O'Reilly Reference Library/networking/puis/ch22_03.htm (9 of 9) [2002-04-12 10:45:59]
[Chapter 22] 22.6 Writing Your Own Wrappers Chapter 22 Wrappers and Proxies 22.6 Writing Your Own Wrappers In this section, we describe the reasons for writing your own wrappers. In most cases, you won't need to write your own wrappers; you'll find that the standard UNIX wrappers will suit most situations. 22.6.1 Wrappers That Provide Temporary Patches A typical case in which you might want to build a wrapper yourself is when there is a report of a new bug in some existing software on your system that is triggered or aggravated when an environment variable or input is uncontrolled. By writing a small wrapper, you can filter what reaches the real program, and you can reset its environment. The software can thus continue to be used until such time as your vendor releases a formal patch. The code in Example 22-2 is an example of such a wrapper. It was originally written by Wietse Venema and released as part of CERT Advisory 11, in 1992. An unexpected interaction between Sun Microsystems' shared library implementation and various SUID and SGID programs could result in unauthorized privileges being granted to users. The temporary fix to the problem was to put a wrapper program around susceptible programs (such as the sendmail program) to filter out environment variables that referenced unauthorized shared libraries - those variables beginning with the characters "LD_". Example 22.2: Wrapper Program for sendmail /* Start of C program source */ /* Change the next line to reflect the full pathname of the file to be protected by the wrapper code */ #define COMMAND "/usr/lib/sendmail.dist" #define VAR_NAME "LD_" main(argc,argv,envp) int argc; char **argv; char **envp; { register char **cpp; file:///C|/Oreilly Unix etc/O'Reilly Reference Library/networking/puis/ch22_06.htm (1 of 4) [2002-04-12 10:45:59]
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Index Search | Symbols | A | B | C
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Index 8.8.3.1. Joetest: a simple pa
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[Chapter 12] 12.3 Protecting Data 1
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[Chapter 16] TCP/IP Networks connec
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[Chapter 7] Backups Making backups
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[Chapter 7] Backups circumstances.[
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[Chapter 7] Backups ● An incremen
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[Chapter 7] Backups or other proble
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[Chapter 7] Backups damage or destr
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[Chapter 7] Backups example, you ca
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[Chapter 5] The UNIX Filesystem 5.1
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[Chapter 5] The UNIX Filesystem con
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[Chapter 18] 18.4 Avoiding the Risk
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the modular inverse of e mod (n). I
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[Preface] Which UNIX System? Which
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[Chapter 23] 23.6 Tips on Generatin
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[Chapter 5] 5.3 The umask 0666 defa
Page 917 and 918:
[Chapter 23] 23.9 A Good Random See
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[Chapter 23] 23.9 A Good Random See
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[Chapter 12] Physical Security as d
Page 923 and 924:
[Chapter 17] 17.6 Network Scanning
Page 925 and 926:
[Chapter 24] 24.3 The Log Files: Di
Page 927 and 928:
[Chapter 18] 18.5 Risks of Web Brow
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[Chapter 18] 18.5 Risks of Web Brow
Page 931 and 932:
[Chapter 22] 22.4 SOCKS Figure 22.1
Page 933 and 934:
22.4.5 SOCKS Identification Policy
Page 935 and 936:
[Chapter 22] 22.4 SOCKS Obviously,
Page 937 and 938:
[Chapter 22] 22.4 SOCKS [ Library H
Page 939 and 940:
[Chapter 20] 20.3 Client-Side NFS S
Page 941 and 942:
[Appendix F] F.2 U. S. Government O
Page 943 and 944:
[Chapter 17] 17.5 Monitoring Your N
Page 945 and 946:
[Chapter 19] RPC, NIS, NIS+, and Ke
Page 947 and 948:
[Chapter 19] RPC, NIS, NIS+, and Ke
Page 949 and 950:
[Chapter 11] 11.4 Entry environment
Page 951 and 952:
[Chapter 3] 3.5 Verifying Your New
Page 953 and 954:
[Chapter 3] 3.5 Verifying Your New
Page 955 and 956:
[Chapter 21] 21.2 Building Your Own
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[Chapter 21] 21.2 Building Your Own
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[Appendix D] D.2 Security Periodica
Page 961 and 962:
[Appendix D] D.2 Security Periodica
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[Chapter 14] 14.2 Serial Interfaces
Page 965 and 966:
[Appendix C] C.3 Signals C.3 Signal
Page 967 and 968: [Appendix C] C.3 Signals overflows)
Page 969 and 970: [Chapter 27] 27.4 What All This Mea
Page 971 and 972: [Appendix E] E.2 Usenet Groups E.2
Page 973 and 974: [Chapter 15] 15.9 Summary 15.9 Summ
Page 975 and 976: [Preface] Scope of This Book into y
Page 977 and 978: [Preface] Scope of This Book Append
Page 979 and 980: [Preface] Conventions Used in This
Page 981 and 982: [Preface] Acknowledgments Acknowled
Page 983 and 984: [Preface] Acknowledgments [ Library
Page 985 and 986: [Preface] A Note to Computer Cracke
Page 987 and 988: [Part II] User Responsibilities Par
Page 989 and 990: [Part III] System Security Part III
Page 991 and 992: [Chapter 20] 20.5 Some Last Comment
Page 993 and 994: [Chapter 20] 20.5 Some Last Comment
Page 995 and 996: [Chapter 22] Wrappers and Proxies C
Page 997 and 998: [Chapter 21] 21.3 Example: Cisco Sy
Page 999 and 1000: destination Specifies the address o
Page 1001 and 1002: [Chapter 21] 21.3 Example: Cisco Sy
Page 1003 and 1004: [Chapter 21] 21.6 Final Comments
Page 1005 and 1006: [Chapter 22] 22.2 sendmail (smap/sm
Page 1011 and 1012: [Chapter 22] 22.3 tcpwrapper ● Tr
Page 1013 and 1014: [Chapter 22] 22.3 tcpwrapper 6. 7.
Page 1015 and 1016: [Chapter 22] 22.3 tcpwrapper # # /e
Page 1017: } [Chapter 22] 22.3 tcpwrapper sed
Page 1021 and 1022: [Chapter 22] 22.6 Writing Your Own
Page 1023 and 1024: [Part VI] Handling Security Inciden
Page 1025 and 1026: [Appendix B] Important Files B. Imp
Page 1027 and 1028: [Appendix B] Important Files /etc/d
Page 1029 and 1030: [Appendix B] Important Files chgrp
Page 1031 and 1032: [Appendix B] Important Files rc? Bo
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