Add blog post Semgrep rules for generic, kotlin, and yaml

generic/container-privileged.sh

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+#!/bin/bash
+
+# ruleid: container-privileged
+docker run --privileged hello-world
+
+# ruleid: container-privileged
+podman run --privileged hello-world
+
+# ok: container-privileged
+docker run hello-world
+
+# ok: container-privileged
+podman run hello-world

generic/container-privileged.yaml

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+rules:
+  - id: container-privileged
+    message: Found container command with extended privileges
+    languages: [generic]
+    severity: WARNING
+    metadata:
+      category: security
+      subcategory: [audit]
+      cwe: "CWE-250: Execution with Unnecessary Privileges"
+      confidence: MEDIUM
+      likelihood: MEDIUM
+      impact: HIGH
+    pattern-either:
+      - pattern: docker ... --privileged
+      - pattern: docker ... --cap-add=ALL
+      - pattern: docker ... --net=host
+      - pattern: docker ... --userns=host
+      - pattern: docker ... --pid=host
+      - pattern: docker ... --ipc=host
+      - pattern: docker ... --security-opt seccomp=unconfined
+      - pattern: podman ... --privileged
+      - pattern: podman ... --cap-add=ALL
+      - pattern: podman ... --net=host
+      - pattern: podman ... --userns=host
+      - pattern: podman ... --pid=host
+      - pattern: podman ... --ipc=host
+      - pattern: podman ... --security-opt seccomp=unconfined

generic/container-user-root.sh

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+#!/bin/bash
+
+# ruleid: container-user-root
+docker run -u root hello-world
+
+# ruleid: container-user-root
+podman run --user root hello-world
+
+# ok: container-user-root
+docker run hello-world
+
+# ok: container-user-root
+podman run hello-world

generic/container-user-root.yaml

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+rules:
+  - id: container-user-root
+    message: Found container command running as root
+    languages: [generic]
+    severity: WARNING
+    metadata:
+      category: security
+      subcategory: [audit]
+      cwe: "CWE-250: Execution with Unnecessary Privileges"
+      confidence: MEDIUM
+      likelihood: MEDIUM
+      impact: HIGH
+    pattern-either:
+      - pattern: docker ... -u root
+      - pattern: docker ... --user root
+      - pattern: podman ... -u root
+      - pattern: podman ... --user root

generic/curl-insecure.sh

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+#!/bin/bash
+
+# ruleid: curl-insecure
+curl -k https://google.com > /dev/null
+
+# ruleid: curl-insecure
+curl --insecure https://google.com > /dev/null
+
+# ok: curl-insecure
+curl --ksomeotherflag https://google.com > /dev/null
+
+# ok: curl-insecure
+curl https://google.com > /dev/null

generic/curl-insecure.yaml

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+rules:
+  - id: curl-insecure
+    message: Found `curl` command disabling SSL verification
+    languages: [generic]
+    severity: WARNING
+    metadata:
+      category: security
+      subcategory: [audit]
+      cwe: "CWE-295: Improper Certificate Validation"
+      confidence: MEDIUM
+      likelihood: MEDIUM
+      impact: HIGH
+    pattern-either:
+      # A space character was left at the end of some patterns to help ensure
+      # that the intended flag was used, and minimize the chance that another,
+      # longer flag that _starts with_ the intended flag results in a false
+      # positive
+      - pattern: "curl ... -k "
+      - pattern: "curl ... --insecure"

generic/curl-unencrypted-url.sh

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+#!/bin/bash
+
+# ruleid: curl-unencrypted-url
+curl http://google.com > /dev/null
+
+# ruleid: curl-unencrypted-url
+curl ftp://google.com > /dev/null
+
+# ok: curl-unencrypted-url
+curl https://google.com > /dev/null

generic/curl-unencrypted-url.yaml

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+rules:
+  - id: curl-unencrypted-url
+    message: Found `curl` command with unencrypted URL (e.g. HTTP, FTP, etc.)
+    languages: [generic]
+    severity: WARNING
+    metadata:
+      category: security
+      subcategory: [audit]
+      cwe: "CWE-319: Cleartext Transmission of Sensitive Information"
+      confidence: MEDIUM
+      likelihood: MEDIUM
+      impact: HIGH
+    pattern-either:
+      - pattern: curl ... http://
+      - pattern: curl ... ftp://

generic/gpg-insecure-flags.sh

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+#!/bin/bash
+
+# ruleid: gpg-insecure-flags
+gpg --skip-verify --output doc --decrypt doc.gpg
+
+# ok: gpg-insecure-flags
+gpg --output doc --decrypt doc.gpg

generic/gpg-insecure-flags.yaml

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+rules:
+  - id: gpg-insecure-flags
+    message: Found `gpg` command using insecure flags
+    languages: [generic]
+    severity: WARNING
+    metadata:
+      category: security
+      subcategory: [audit]
+      cwe: "CWE-295: Improper Certificate Validation"
+      confidence: MEDIUM
+      likelihood: MEDIUM
+      impact: HIGH
+    pattern-either:
+      - pattern: gpg ... --allow-non-selfsigned-uid
+      - pattern: gpg ... --allow-freeform-uid
+      - pattern: gpg ... --allow-old-cipher-algos
+      - pattern: gpg ... --allow-weak-digest-algos
+      - pattern: gpg ... --allow-weak-key-signatures
+      - pattern: gpg ... --ignore-time-conflict
+      - pattern: gpg ... --ignore-valid-from
+      - pattern: gpg ... --ignore-crc-error
+      - pattern: gpg ... --ignore-mdc-error
+      - pattern: gpg ... --skip-verify
+      - pattern: gpg ... --no-require-cross-certification

generic/installer-allow-untrusted.sh

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+#!/bin/bash
+
+# ruleid: installer-allow-untrusted
+sudo installer -pkg /path/to/package.pkg -target / -allowUntrusted
+
+# ok: installer-allow-untrusted
+sudo installer -pkg /path/to/package.pkg -target /

generic/installer-allow-untrusted.yaml

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+rules:
+  - id: installer-allow-untrusted
+    message: Found `installer` command allowing untrusted installations
+    languages: [generic]
+    severity: WARNING
+    metadata:
+      category: security
+      subcategory: [audit]
+      cwe: "CWE-494: Download of Code Without Integrity Check"
+      confidence: HIGH
+      likelihood: HIGH
+      impact: HIGH
+    pattern: installer ... -allowUntrusted

generic/openssl-insecure-flags.sh

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+#!/bin/bash
+
+# ruleid: openssl-insecure-flags
+openssl genpkey -algorithm RSA -out private_key.pem -aes-256-cbc -pass pass:mysecretpass
+
+# ok: openssl-insecure-flags
+openssl genpkey -algorithm RSA -out private_key.pem --noencsomeotherflag
+
+# ok: openssl-insecure-flags
+openssl genpkey -algorithm RSA -out private_key.pem -aes-256-cbc -pass env:PASSVAR

generic/openssl-insecure-flags.yaml

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+rules:
+  - id: openssl-insecure-flags
+    message: Found `openssl` command using insecure flags
+    languages: [generic]
+    severity: WARNING
+    metadata:
+      category: security
+      subcategory: [audit]
+      cwe: "CWE-295: Improper Certificate Validation"
+      confidence: MEDIUM
+      likelihood: MEDIUM
+      impact: HIGH
+    pattern-either:
+      # A space character was left at the end of some patterns to help ensure
+      # that the intended flag was used, and minimize the chance that another,
+      # longer flag that _starts with_ the intended flag results in a false
+      # positive
+      - pattern: "openssl ... -pass pass:"
+      - pattern: "openssl ... -passin pass:"
+      - pattern: "openssl ... -passout pass:"
+      - pattern: "openssl ... -nodes "
+      - pattern: "openssl ... -noenc "
+      - pattern: "openssl ... -sha1 "

generic/ssh-disable-host-key-checking.sh

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+#!/bin/bash
+
+# ruleid: ssh-disable-host-key-checking
+ssh -o StrictHostKeyChecking=no user@hostname
+
+# ok: ssh-disable-host-key-checking
+ssh user@hostname

generic/ssh-disable-host-key-checking.yaml

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+rules:
+  - id: ssh-disable-host-key-checking
+    message: Found `ssh` command disabling host key checking
+    languages: [generic]
+    severity: WARNING
+    metadata:
+      category: security
+      subcategory: [audit]
+      cwe: "CWE-295: Improper Certificate Validation"
+      confidence: MEDIUM
+      likelihood: MEDIUM
+      impact: HIGH
+    pattern: ssh ... StrictHostKeyChecking=no

generic/tar-insecure-flags.sh

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+#!/bin/bash
+
+# ruleid: tar-insecure-flags
+tar -xvf --absolute-paths archive.tar
+
+# ruleid: tar-insecure-flags
+tar -xvf -P archive.tar
+
+# ok: tar-insecure-flags
+tar -xvf --Psomeotherflag archive.tar
+
+# ok: tar-insecure-flags
+tar -xvf archive.tar

generic/tar-insecure-flags.yaml

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+rules:
+  - id: tar-insecure-flags
+    message: Found `tar` command using insecure flags
+    languages: [generic]
+    severity: WARNING
+    metadata:
+      category: security
+      subcategory: [audit]
+      cwe: "CWE-73: External Control of File Name or Path"
+      confidence: MEDIUM
+      likelihood: MEDIUM
+      impact: HIGH
+    pattern-either:
+      # A space character was left at the end of some patterns to help ensure
+      # that the intended flag was used, and minimize the chance that another,
+      # longer flag that _starts with_ the intended flag results in a false
+      # positive
+      - pattern: "tar ... -P "
+      - pattern: "tar ... --absolute-paths"
+      - pattern: "tar ... --absolute-names"
+      - pattern: "tar ... --passphrase "

generic/wget-no-check-certificate.sh

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+#!/bin/bash
+
+# ruleid: wget-no-check-certificate
+wget --no-check-certificate https://google.com
+
+# ruleid: wget-no-check-certificate
+wget --no-hsts https://google.com
+
+# ok: wget-no-check-certificate
+wget https://google.com

generic/wget-no-check-certificate.yaml

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+rules:
+  - id: wget-no-check-certificate
+    message: Found `wget` command disabling SSL verification
+    languages: [generic]
+    severity: WARNING
+    metadata:
+      category: security
+      subcategory: [audit]
+      cwe: "CWE-295: Improper Certificate Validation"
+      confidence: MEDIUM
+      likelihood: MEDIUM
+      impact: HIGH
+    pattern-either:
+      - pattern: wget ... --no-check-certificate
+      - pattern: wget ... --no-hsts

generic/wget-unencrypted-url.sh

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+#!/bin/bash
+
+# ruleid: wget-unencrypted-url
+wget http://google.com
+
+# ruleid: wget-unencrypted-url
+wget ftp://google.com
+
+# ok: wget-unencrypted-url
+wget https://google.com

generic/wget-unencrypted-url.yaml

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+rules:
+  - id: wget-unencrypted-url
+    message: Found `wget` command  with unencrypted URL (e.g. HTTP, FTP, etc.)
+    languages: [generic]
+    severity: WARNING
+    metadata:
+      category: security
+      subcategory: [audit]
+      cwe: "CWE-319: Cleartext Transmission of Sensitive Information"
+      confidence: MEDIUM
+      likelihood: MEDIUM
+      impact: HIGH
+    pattern-either:
+      - pattern: wget ... http://
+      - pattern: wget ... ftp://

kotlin/gc-call.java

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+class Test {
+    public static void main(String[] args) {
+        // ruleid: gc-call
+        System.gc();
+    }
+}

kotlin/gc-call.kt

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+fun main() {
+    // ruleid: gc-call
+    System.gc()
+}

kotlin/gc-call.yaml

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+rules:
+  - id: gc-call
+    message: |
+      Calling `gc` suggests to the JVM that the garbage collector should be
+      run, and memory should be reclaimed. This is only a suggestion, and there
+      is no guarantee that anything will happen. Relying on this behavior for
+      correctness or memory management is an anti-pattern.
+    languages: [java, kotlin]
+    severity: WARNING
+    metadata:
+      category: best-practice
+      subcategory: [audit]
+      confidence: HIGH
+      likelihood: HIGH
+      impact: LOW
+      references:
+        - https://stackoverflow.com/questions/2414105/why-is-it-bad-practice-to-call-system-gc
+    pattern-either:
+      - pattern: System.gc()
+      - pattern: Runtime.getRuntime().gc()

kotlin/mongo-hostname-verification-disabled.java

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+package test
+
+import com.mongodb.MongoClientSettings
+import com.mongodb.MongoClients
+
+class HelloWorld {
+    public static void main(String[] args) {
+        MongoClientSettings settings = MongoClientSettings.builder()
+            .applyToSslSettings(builder -> {
+                builder.enabled(true);
+                // ruleid: mongo-hostname-verification-disabled
+                builder.invalidHostNameAllowed(true);
+            })
+            .build();
+
+        MongoClientSettings settings = MongoClientSettings.builder()
+            .applyToSslSettings(builder -> {
+                // ok: mongo-hostname-verification-disabled
+                builder.enabled(true);
+            })
+            .build();
+    }
+}