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4 changed files with 208 additions and 9 deletions
105
README.md
105
README.md
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@ -89,6 +89,106 @@ It is recommed to install apg in a directory of your ```$PATH``` environment. To
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```sh
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$ sudo cp apg /usr/local/bin/apg
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```
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## Usage examples
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### Default behaviour
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By default apg-go will generate 6 passwords, with a minimum length of 12 characters and a
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maxiumum length of 20 characters. The generated password will use a character set constructed
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from lower case, upper case and numeric characters.
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```shell
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$ ./apg-go
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R8rCC8bw5NvJmTUK2g
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cHB9qogTbfdzFgnH
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hoHfpWAHHSNa4Q
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QyjscIsZkQGh
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904YqsU5SnoqLo2w
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utdFKXdeiXFzM
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```
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### Modifying the character sets
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#### Old style
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Let's assume you want to generate a single password, constructed out of upper case, numeric
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and special characters. Since lower case is part of the default set, you would need to disable them
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by setting the `-L` parameter. In addition you would set the `-S` parameter to enable special
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characters. Finally the parameter `-n 1` is needed to keep apg-go from generating more than one
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password:
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```shell
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$ ./apg-go -n 1 -L -S
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XY7>}H@5U40&_A1*9I$
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```
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#### New/modern style
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Since the old style switches can be kind of confusing, it is recommended to use the "new style"
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parameters instead. The new style is all combined in the `-M` parameter. Using the upper case
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version of a parameter argument enables a feature, while the lower case version disabled it. The
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previous example could be represented like this in new style:
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```shell
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$ ./apg-go -n 1 -M lUSN
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$</K?*|M)%8\U$5JA5~
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```
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#### Human readability
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Generated passwords can sometimes be a bit hard to read for humans, especially when ambiguous
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characters are part of the password. Some characters in the ASCII character set look similar to
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each other. In example it can be hard to differentiate an upper case I from a lower case l.
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Same applies to the number zero (0) and the upper case O. To not run into issues with human
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readability, you can set the `-H` parameter to toggle on the "human readable" feature. When the
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option is set, apg-go will avoid using any of the typical ambiguous characters in the generated
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passwords.
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```shell
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$ ./apg-go -n 1 -M LUSN -H
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YpranThY3b6b5%\6ARx
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```
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#### Character exclusion
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Let's assume, that for whatever reason, your generated password can never include a colon (:) sign. For
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this specific case, you can use the `-E` parameter to specify a list of characters that are to be excluded
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from the password generation character set:
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```shell
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$ ./apg-go -n 1 -M lUSN -H -E :
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~B2\%E_|\VV|/5C7EF=
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```
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#### Complex passwords
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If you want to generate complex passwords, there is a shortcut for this as well. By setting the `-C`
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parameter, apg-go will automatically default to the most secure settings. The complex parameter
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basically implies that the password will use all available characters (lower case, upper case,
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numeric and special) and will make sure that human readability is disabled.
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```shell
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$ ./apg-go -n 1 -C
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{q6cvz9le5_fo"X7
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```
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### Password length
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By default, apg-go will generate a password with a random length between 12 and 20 characters. If you
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want to be more specific, you can use the `-m` and `-x` parameters to override the defaults. Let's
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assume you want a single complex password with a length of exactly 32 characters, you can do so by
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running:
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```shell
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$ ./apg-go -n 1 -C -m 32 -x 32
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5lc&HBvx=!EUY*;'/t&>B|~sudhtyDBu
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```
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### Password spelling
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If you need to read out a password, it can be helpful to know the corresponding word for that character in
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the phonetic alphabet. By setting the `-l` parameter, agp-go will provide you with the phonetic spelling
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(english language) of your newly created password:
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```shell
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$ ./apg-go -n 1 -M LUSN -H -E : -l
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fUTDKeFsU+zn3r= (foxtrot/Uniform/Tango/Delta/Kilo/echo/Foxtrot/sierra/Uniform/PLUS_SIGN/zulu/november/THREE/romeo/EQUAL_SIGN)
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```
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### Have I Been Pwned
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Even though, the passwords that apg-go generated for you, are secure, there is a minimal chance, that
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someone on the planet used exactly the same password before and that this person was part of an
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internet leak or hack, which exposed the password to the public. Such passwords are not considered
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secure anymore as they usually land on public available password lists, that are used by crackers.
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To be on the safe side, you can use the `-p` parameter, to enable a HIBP check. When the feature is
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enabled, apg-go will check the HIBP database at https://haveibeenpwned.com if that password has been
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leaked before and provide you with a warning if that is the case.
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Please be aware, that this is a live check against the HIBP API, which not only requires internet
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connectivity, but also might take between 500ms to 1s to complete. When you generating a bigger list
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of password `-n 100`, the process could take much longer than without the `-p` feature enabled.
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## CLI parameters
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_apg-go_ replicates some of the parameters of the original APG. Some parameters are different though:
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@ -105,5 +205,10 @@ _apg-go_ replicates some of the parameters of the original APG. Some parameters
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- ```-H```: Avoid ambiguous characters in passwords (i. e.: 1, l, I, o, O, 0) (Default: off)
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- ```-C```: Generate complex passwords (implies -L -U -N -S and disables -H) (Default: off)
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- ```-l```: Spell generated passwords (Default: off)
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- ```-p```: Check the HIBP database if the generated passwords was found in a leak before (Default: off) // *this feature requires internet connectivity*
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- ```-h```: Show a CLI help text
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- ```-v```: Show the version number
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## Contributors
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Thanks to the following people for contributing to the apg-go codebase:
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* [Romain Tartière](https://github.com/smortex)
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15
apg.go
15
apg.go
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@ -10,7 +10,7 @@ import (
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// Constants
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const DefaultMinLenght int = 12
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const DefaultMaxLenght int = 20
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const VersionString string = "0.3.1"
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const VersionString string = "0.3.2"
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type Config struct {
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minPassLen int
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@ -22,6 +22,7 @@ type Config struct {
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useNumber bool
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useSpecial bool
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humanReadable bool
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checkHibp bool
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excludeChars string
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newStyleModes string
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spellPassword bool
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@ -50,6 +51,8 @@ Options:
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-H Avoid ambiguous characters in passwords (i. e.: 1, l, I, O, 0) (Default: off)
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-C Enable complex password mode (implies -L -U -N -S and disables -H) (Default: off)
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-l Spell generated passwords in phonetic alphabet (Default: off)
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-p Check the HIBP database if the generated passwords was found in a leak before (Default: off)
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'--> this feature requires internet connectivity
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-h Show this help text
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-v Show version string`
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@ -96,5 +99,15 @@ func main() {
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break
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}
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}
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if config.checkHibp {
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isPwned, err := checkHibp(pwString)
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if err != nil {
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log.Printf("unable to check HIBP database: %v", err)
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}
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if isPwned {
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fmt.Print("^-- !!WARNING: The previously generated password was found in HIPB database. Do not use it!!\n")
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}
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}
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}
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}
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53
config.go
53
config.go
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@ -7,16 +7,33 @@ import (
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// Parse the CLI flags
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func parseFlags() Config {
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var config Config
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var switchConf Config
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defaultSwitches := Config{
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useLowerCase: true,
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useUpperCase: true,
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useNumber: true,
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useSpecial: false,
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useComplex: false,
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humanReadable: false,
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}
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config := Config{
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useLowerCase: defaultSwitches.useLowerCase,
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useUpperCase: defaultSwitches.useUpperCase,
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useNumber: defaultSwitches.useNumber,
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useSpecial: defaultSwitches.useSpecial,
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useComplex: defaultSwitches.useComplex,
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humanReadable: defaultSwitches.humanReadable,
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}
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// Read and set all flags
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flag.BoolVar(&config.useLowerCase, "L", true, "Use lower case characters in passwords")
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flag.BoolVar(&config.useUpperCase, "U", true, "Use upper case characters in passwords")
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flag.BoolVar(&config.useNumber, "N", true, "Use numbers in passwords")
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flag.BoolVar(&config.useSpecial, "S", false, "Use special characters in passwords")
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flag.BoolVar(&config.useComplex, "C", false, "Generate complex passwords (implies -L -U -N -S, disables -H)")
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flag.BoolVar(&switchConf.useLowerCase, "L", false, "Use lower case characters in passwords")
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flag.BoolVar(&switchConf.useUpperCase, "U", false, "Use upper case characters in passwords")
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flag.BoolVar(&switchConf.useNumber, "N", false, "Use numerich characters in passwords")
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flag.BoolVar(&switchConf.useSpecial, "S", false, "Use special characters in passwords")
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flag.BoolVar(&switchConf.useComplex, "C", false, "Generate complex passwords (implies -L -U -N -S, disables -H)")
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flag.BoolVar(&switchConf.humanReadable, "H", false, "Generate human-readable passwords")
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flag.BoolVar(&config.spellPassword, "l", false, "Spell generated password")
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flag.BoolVar(&config.humanReadable, "H", false, "Generate human-readable passwords")
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flag.BoolVar(&config.checkHibp, "p", false, "Check the HIBP database if the generated password was leaked before")
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flag.BoolVar(&config.showVersion, "v", false, "Show version")
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flag.IntVar(&config.minPassLen, "m", DefaultMinLenght, "Minimum password length")
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flag.IntVar(&config.maxPassLen, "x", DefaultMaxLenght, "Maxiumum password length")
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@ -26,7 +43,27 @@ func parseFlags() Config {
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"New style password parameters (higher priority than single parameters)")
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flag.Parse()
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// Parse additional parameters
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// Invert-switch the defaults
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if switchConf.useLowerCase {
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config.useLowerCase = !defaultSwitches.useLowerCase
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}
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if switchConf.useUpperCase {
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config.useUpperCase = !defaultSwitches.useUpperCase
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}
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if switchConf.useNumber {
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config.useNumber = !defaultSwitches.useNumber
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}
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if switchConf.useSpecial {
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config.useSpecial = !defaultSwitches.useSpecial
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}
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if switchConf.useComplex {
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config.useComplex = !defaultSwitches.useComplex
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}
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if switchConf.humanReadable {
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config.humanReadable = !defaultSwitches.humanReadable
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}
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// Parse additional parameters and new-style switches
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parseParams(&config)
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return config
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44
hibp.go
Normal file
44
hibp.go
Normal file
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@ -0,0 +1,44 @@
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package main
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import (
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"bufio"
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"crypto/sha1"
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"fmt"
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"log"
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"net/http"
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"strings"
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"time"
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)
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func checkHibp(p string) (bool, error) {
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shaSum := fmt.Sprintf("%x", sha1.Sum([]byte(p)))
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firstPart := shaSum[0:5]
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secondPart := shaSum[5:]
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isPwned := false
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httpClient := &http.Client{Timeout: time.Second * 2}
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httpRes, err := httpClient.Get("https://api.pwnedpasswords.com/range/" + firstPart)
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if err != nil {
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return false, err
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}
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defer func() {
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err := httpRes.Body.Close()
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if err != nil {
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log.Printf("error while closing HTTP response body: %v\n", err)
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}
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}()
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scanObj := bufio.NewScanner(httpRes.Body)
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for scanObj.Scan() {
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scanLine := strings.SplitN(scanObj.Text(), ":", 2)
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if strings.ToLower(scanLine[0]) == secondPart {
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isPwned = true
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break
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}
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}
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if err := scanObj.Err(); err != nil {
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return isPwned, err
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}
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return isPwned, nil
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}
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